阅读说明：本技术 一种阻燃型电伴热带 (Flame-retardant electric tracing band ) 是由 李贻连 于 2021-07-23 设计创作，主要内容包括：本发明一种阻燃型电伴热带,包括位于最内层的两根镀锡铜丝、包裹于镀锡铜丝外围的PTC导电发热层、包裹于PTC导电发热层外围的绝缘层、包裹于绝缘层外围的金属屏蔽层以及位于最外层的加强防护阻燃层,位于最外层的加强防护阻燃层由加强金属网和包裹于加强金属网表面的阻燃材料层构成。本发明通过由三氧化二锑、氢氧化铝及有机卤化物阻燃剂构成的有机无机混合阻燃物,可有效提高电伴热带表面的阻燃材料层的阻燃性能；本发明通过由改性玄武岩纤维、聚苯砜对苯二甲酰胺纤维和多晶莫来石纤维构成的纤维类阻燃物,可有效提高电伴热带表面的阻燃材料层的阻燃性能。(The invention relates to a flame-retardant electric tracing band which comprises two tinned copper wires positioned at the innermost layer, a PTC (positive temperature coefficient) conductive heating layer wrapped on the periphery of the tinned copper wires, an insulating layer wrapped on the periphery of the PTC conductive heating layer, a metal shielding layer wrapped on the periphery of the insulating layer and a reinforced protective flame-retardant layer positioned at the outermost layer, wherein the reinforced protective flame-retardant layer positioned at the outermost layer consists of a reinforced metal mesh and a flame-retardant material layer wrapped on the surface of the reinforced metal mesh. According to the invention, the flame retardant property of the flame retardant material layer on the surface of the electric tracing band can be effectively improved by the organic-inorganic mixed flame retardant consisting of antimony trioxide, aluminum hydroxide and an organic halide flame retardant; the flame retardant property of the flame retardant material layer on the surface of the electric tracing band can be effectively improved through the fiber flame retardant consisting of the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber.)

1. The utility model provides a fire-retardant type electric tracing area, includes two tinned copper wires that are located the inlayer, wraps up in the outer conductive layer that generates heat of tinned copper wire outlying PTC, wraps up in the outer conductive insulating layer that generates heat of PTC, wraps up in the outer peripheral metal shielding layer of insulating layer and be located outermost enhancement protection flame retardant coating, its characterized in that: the reinforced protective flame-retardant layer positioned on the outermost layer consists of a reinforced metal net and a flame-retardant material layer wrapped on the surface of the reinforced metal net.

2. The flame retardant electric tracing ribbon according to claim 1, wherein: the flame-retardant material layer is prepared from an organic-inorganic mixed flame retardant, a fiber flame retardant and an auxiliary flame retardant, wherein the flame-retardant material layer comprises the following components in percentage by weight: 45% of organic-inorganic mixed flame retardant, 40% of fiber flame retardant and 15% of auxiliary flame retardant.

3. The flame retardant electric tracing ribbon according to claim 2, wherein: the organic-inorganic mixed flame retardant comprises an organic flame retardant material and an inorganic flame retardant material which are synergistically mixed, wherein the organic flame retardant material and the inorganic flame retardant material are in the following composition ratio: 45% of organic flame-retardant material and 55% of inorganic flame-retardant material, wherein the inorganic flame-retardant material adopts antimony trioxide and aluminum hydroxide, and the composition ratio of the antimony trioxide to the aluminum hydroxide is as follows: 45% of antimony trioxide and 55% of aluminum hydroxide, wherein the organic flame retardant material adopts an organic halide flame retardant, and the organic halide flame retardant is one or more of decabromodiphenyl acid, tetrabromobisphenol, brominated polystyrene, chlorinated paraffin and chlorinated polyethylene.

4. The flame retardant electric tracing ribbon according to claim 2, wherein: the fiber flame retardant comprises the following components: the composite material comprises modified basalt fibers, polyphenylsulfone terephthalamide fibers and polycrystalline mullite fibers, wherein the modified basalt fibers, the polyphenylsulfone terephthalamide fibers and the polycrystalline mullite fibers are prepared from the following components in percentage by weight: 40% of modified basalt fiber, 35% of polyphenylsulfone terephthalamide fiber and 25% of polycrystalline mullite fiber.

5. The flame retardant electric tracing ribbon according to claim 2, wherein: the auxiliary flame retardant comprises the following components: diatomite, calcined argil, silicone oil, zinc borate and pure water, wherein the five components are as follows: 30% of diatomite, 25% of calcined argil, 20% of silicone oil, 18% of zinc borate and 7% of pure water.

6. The flame retardant electric tracing ribbon according to claims 1 to 5, wherein: the preparation method of the flame-retardant material layer comprises the following steps:

the method comprises the following steps: the addition amount of the components is prepared according to the composition proportion of the components, and the components are respectively and independently placed for standby after the preparation is finished.

Step two: the aluminum hydroxide is micronized and then fully mixed with antimony trioxide to form an inorganic flame retardant material, then an organic halide flame retardant is doped into the mixed inorganic flame retardant material, and the organic halide flame retardant and the mixed inorganic flame retardant material are fully mixed to form an organic-inorganic mixed flame retardant.

Step three: the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are respectively and fully ground to form powdery particles, and the powdery particles formed by grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are put into a mixing device together to be fully mixed to form the fiber flame retardant.

Step four: the diatomite, the calcined argil and the zinc borate are put together and fully stirred and mixed, then the mixed liquid obtained by mixing the silicone oil and the pure water is poured into the mixture, and the mixture is fully stirred and mixed to form the auxiliary flame retardant.

Step five: mixing the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant together, and fully stirring to fully and uniformly mix the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant to form a viscous flame retardant material;

step six: uniformly coating the viscous flame retardant material on the surface of the reinforced metal mesh at the outermost periphery of the electric tracing band, coating three layers till a compact flame retardant material layer is formed on the surface of the reinforced metal mesh, placing the electric tracing band coated with the flame retardant material in drying equipment for drying treatment, and drying and molding the flame retardant material layer completely.

7. The flame retardant electric tracing ribbon according to claim 6, wherein: and in the second step, the stirring speed of the mixing equipment is 300r/min when the aluminum hydroxide and the antimony trioxide are mixed, the temperature in the mixing equipment is maintained between 25 ℃ and 35 ℃, the mixing time is 15min to 25min, the stirring speed of the mixing equipment is 300r/min when the organic halide flame retardant and the inorganic flame retardant are mixed, the temperature in the mixing equipment is maintained between 22 ℃ and 38 ℃, and the mixing time is 18min to 28 min.

8. The flame retardant electric tracing ribbon according to claim 6, wherein: in the third step, the temperature of the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber in the mincing device is maintained between 35 ℃ and 45 ℃ in the mincing process, the mincing time is 20min to 30min, the stirring speed of the mixing device is 350r/min when the powdery particles formed by mincing the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are mixed, the temperature in the mixing device is maintained between 32 ℃ and 42 ℃, and the mixing time is 20min to 30 min.

9. The flame retardant electric tracing ribbon according to claim 6, wherein: in the fourth step, the stirring speed of the mixing equipment is 250r/min when the diatomite, the calcined argil and the zinc borate are mixed, the temperature in the mixing equipment is maintained between 28 ℃ and 36 ℃, the mixing time is 18min to 26min, the stirring speed of the mixing equipment is 250r/min when the diatomite, the calcined argil and the zinc borate are mixed with the silicone oil and the pure water, the temperature in the mixing equipment is maintained between 32 ℃ and 38 ℃, and the mixing time is 22min to 28 min.

10. The flame retardant electric tracing ribbon according to claim 6, wherein: fifthly, when the organic and inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant are mixed, the stirring speed of a mixing device is 350r/min, the temperature in the mixing device is maintained between 35 ℃ and 40 ℃, and the mixing time is 30min to 40 min; and sixthly, coating the flame retardant material on each layer in the step six, wherein the coating thickness of the flame retardant material is not less than 0.05mm, the drying temperature of electric tracing after the flame retardant material is coated is maintained between 55 ℃ and 75 ℃, and the drying time is 35min to 55 mim.

Technical Field

The invention relates to the technical field of electric tracing bands, in particular to a flame-retardant electric tracing band.

Background

The electric tracing band is composed of conductive polymer, two parallel metal wires and an insulating protective layer. The conductive polymer has the characteristics of high positive temperature coefficient, is mutually connected in parallel, can automatically adjust the output power along with the temperature change of a heated system, automatically limits the heating temperature, can be randomly truncated or used for a long time within a certain range, and allows multiple times of cross overlapping without the worry of high-temperature hot spots and burning; the flame retardant property of a layer of wrapping material on the periphery of a common electric tracing band is not ideal. In view of the above, a flame retardant electric tracing band is proposed.

Disclosure of Invention

In order to make up for the defects, the invention provides a flame-retardant electric tracing band.

The technical scheme of the invention is as follows:

the utility model provides a fire-retardant type electric tracing band, includes two tinned copper wires that are located the inlayer, wraps up in the outer conductive layer that generates heat of peripheral PTC of tinned copper wire, wraps up in the outer insulating layer of the conductive layer that generates heat of PTC, wraps up in the outer metal shielding layer of insulating layer and is located outermost enhancement protection flame retardant coating, is located outermost enhancement protection flame retardant coating and comprises strengthening the metal mesh and wrapping up in the flame retardant material layer who strengthens the metal mesh surface.

Preferably, the flame-retardant material layer is prepared from an organic-inorganic mixed flame retardant, a fiber flame retardant and an auxiliary flame retardant, wherein the three components are in the following proportion: 45% of organic-inorganic mixed flame retardant, 40% of fiber flame retardant and 15% of auxiliary flame retardant.

Preferably, the organic-inorganic mixed flame retardant comprises an organic flame retardant material and an inorganic flame retardant material which are synergistically mixed, wherein the organic flame retardant material and the inorganic flame retardant material are in the following ratio: 45% of organic flame-retardant material and 55% of inorganic flame-retardant material, wherein the inorganic flame-retardant material adopts antimony trioxide and aluminum hydroxide, and the composition ratio of the antimony trioxide to the aluminum hydroxide is as follows: 45% of antimony trioxide and 55% of aluminum hydroxide, wherein the organic flame retardant material adopts an organic halide flame retardant, and the organic halide flame retardant is one or more of decabromodiphenyl acid, tetrabromobisphenol, brominated polystyrene, chlorinated paraffin and chlorinated polyethylene.

Preferably, the fiber-based flame retardant comprises the following components: the composite material comprises modified basalt fibers, polyphenylsulfone terephthalamide fibers and polycrystalline mullite fibers, wherein the modified basalt fibers, the polyphenylsulfone terephthalamide fibers and the polycrystalline mullite fibers are prepared from the following components in percentage by weight: 40% of modified basalt fiber, 35% of polyphenylsulfone terephthalamide fiber and 25% of polycrystalline mullite fiber.

Preferably, the auxiliary flame retardant comprises the following components: diatomite, calcined argil, silicone oil, zinc borate and pure water, wherein the five components are as follows: 30% of diatomite, 25% of calcined argil, 20% of silicone oil, 18% of zinc borate and 7% of pure water.

Preferably, the preparation method of the flame retardant material layer comprises the following steps:

the method comprises the following steps: preparing the addition amount of the components according to the composition proportion of the components in a corresponding proportion, and respectively and independently placing the components for later use after the preparation is finished;

step two: micronizing aluminum hydroxide, fully mixing with antimony trioxide to form an inorganic flame retardant material, doping an organic halide flame retardant into the mixed inorganic flame retardant material, and fully mixing the organic halide flame retardant and the mixed inorganic flame retardant material to form an organic-inorganic mixed flame retardant;

step three: fully grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber respectively to form powdery particles, and putting the powdery particles formed by grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber into a mixing device together for fully mixing to form a fiber flame retardant;

step four: placing diatomite, calcined argil and zinc borate together, fully stirring and mixing, then pouring a mixed liquid obtained by mixing silicone oil and pure water into the mixture, and fully stirring and mixing to form an auxiliary flame retardant;

step five: mixing the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant together, and fully stirring to fully and uniformly mix the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant to form a viscous flame retardant material;

step six: uniformly coating the viscous flame retardant material on the surface of the reinforced metal mesh at the outermost periphery of the electric tracing band, coating three layers till a compact flame retardant material layer is formed on the surface of the reinforced metal mesh, placing the electric tracing band coated with the flame retardant material in drying equipment for drying treatment, and drying and molding the flame retardant material layer completely.

Preferably, in the second step, the stirring speed of the mixing equipment is 300r/min when the aluminum hydroxide and the antimony trioxide are mixed, the temperature in the mixing equipment is maintained between 25 ℃ and 35 ℃, the mixing time is 15min to 25min, the stirring speed of the mixing equipment is 300r/min when the organic halide flame retardant and the inorganic flame retardant are mixed, the temperature in the mixing equipment is maintained between 22 ℃ and 38 ℃, and the mixing time is 18min to 28 min.

Preferably, in the third step, the temperature in the mincing equipment for the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber in the mincing process is maintained between 35 ℃ and 45 ℃, the mincing time is 20min to 30min, the stirring rotating speed of the mixing equipment is 350r/min when the powdery particles formed by mincing the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are mixed, the temperature in the mixing equipment is maintained between 32 ℃ and 42 ℃, and the mixing time is 20min to 30 min.

Preferably, in the fourth step, the stirring speed of the mixing equipment is 250r/min when the diatomite, the calcined argil and the zinc borate are mixed, the temperature in the mixing equipment is maintained between 28 ℃ and 36 ℃, the mixing time is 18min to 26min, the stirring speed of the mixing equipment is 250r/min when the diatomite, the calcined argil and the zinc borate are mixed, the temperature in the mixing equipment is maintained between 32 ℃ and 38 ℃, and the mixing time is 22min to 28 min.

Preferably, in the fifth step, when the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant are mixed, the stirring speed of the mixing equipment is 350r/min, the temperature in the mixing equipment is maintained between 35 ℃ and 40 ℃, and the mixing time is 30min to 40 min; and sixthly, coating the flame retardant material on each layer in the step six, wherein the coating thickness of the flame retardant material is not less than 0.05mm, the drying temperature of electric tracing after the flame retardant material is coated is maintained between 55 ℃ and 75 ℃, and the drying time is 35min to 55 mim.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the flame retardant property of the flame retardant material layer on the surface of the electric tracing band can be effectively improved by the organic-inorganic mixed flame retardant consisting of antimony trioxide, aluminum hydroxide and an organic halide flame retardant;

2. the flame retardant property of the flame retardant material layer on the surface of the electric tracing band can be effectively improved through the fiber flame retardant consisting of the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber;

3. according to the invention, the auxiliary flame retardant consisting of diatomite, calcined argil, silicone oil, zinc borate and pure water can effectively improve the flame retardant property of the flame retardant layer on the surface of the electric tracing band.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The embodiment provides a fire-retardant type electric tracing band, including being located two tinned copper wires of inlayer, wrap up in the conductive layer that generates heat of the outlying PTC of tinned copper wire, wrap up in the conductive insulating layer that generates heat of PTC, wrap up in the insulating layer outlying metallic shield layer and be located outermost enhancement protection flame retardant coating, be located outermost enhancement protection flame retardant coating by strengthening the metal mesh and wrap up in the flame retardant material layer who strengthens the metal mesh surface and constitute.

Preferably, the flame retardant material layer is prepared from an organic-inorganic mixed flame retardant, a fiber flame retardant and an auxiliary flame retardant, wherein the ratio of the three components is as follows: 45% of organic-inorganic mixed flame retardant, 40% of fiber flame retardant and 15% of auxiliary flame retardant.

Preferably, the organic-inorganic hybrid flame retardant in this embodiment comprises an organic flame retardant material and an inorganic flame retardant material which are synergistically mixed, wherein the ratio of the organic flame retardant material to the inorganic flame retardant material is as follows: 45% of organic flame-retardant material and 55% of inorganic flame-retardant material, wherein the inorganic flame-retardant material adopts antimony trioxide and aluminum hydroxide, and the composition ratio of the antimony trioxide to the aluminum hydroxide is as follows: 45% of antimony trioxide and 55% of aluminum hydroxide, wherein the organic flame retardant material adopts an organic halide flame retardant, and the organic halide flame retardant adopts decabromodiphenyl acid.

Antimony trioxide and aluminum hydroxide belong to inorganic compounds, have high melting points, and organic halide flame retardants also have high melting points, so that the antimony trioxide, the aluminum hydroxide and the organic halide flame retardants are matched for use, the chemical properties of the antimony trioxide, the aluminum hydroxide and the organic halide flame retardants can be effectively combined, and the excellent flame retardant performance can be realized.

Preferably, the fiber-based flame retardant of the present embodiment comprises the following components: the composite material comprises modified basalt fibers, polyphenylsulfone terephthalamide fibers and polycrystalline mullite fibers, wherein the modified basalt fibers, the polyphenylsulfone terephthalamide fibers and the polycrystalline mullite fibers are prepared from the following components in percentage by weight: 40% of modified basalt fiber, 35% of polyphenylsulfone terephthalamide fiber and 25% of polycrystalline mullite fiber.

The modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber have high melting points, the strength of the three substances is high, the fiber flame retardant formed by combining the three materials has various excellent performances of electric insulation, corrosion resistance, high temperature resistance and the like, and the flame retardant property of the whole electric tracing band can be effectively improved.

Preferably, the auxiliary flame retardant comprises the following components: diatomite, calcined argil, silicone oil, zinc borate and pure water, wherein the five components are as follows: 30% of diatomite, 25% of calcined argil, 20% of silicone oil, 18% of zinc borate and 7% of pure water.

The density of the diatomite is 1.9-2.3 g/cm3, the bulk density is 0.34-0.65 g/cm3, the specific surface area is 40-65 square meters per gram, and the pore volume is 0.45-0.98 cm³The water absorption is 2-4 times of the volume of the material per se, the melting point is 1650-1750 ℃, a special porous structure can be observed under an electron microscope, and the excellent physical properties determine that the material has excellent flame retardant performance; the calcined argil has excellent freeze-thaw resistance, can be frozen and thawed for 50 times at-45 ℃ without cracks, has good weather resistance and corrosion resistance, has an internal structure which is not easily influenced by acidic substances, and also has higher melting point and excellent flame retardant property; the silicone oil has very small vapor pressure, higher flash point and ignition point and lower freezing point, has heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and smaller surface tension, and also has low viscosity-temperature coefficient and higher compression resistance; the zinc borate can be used as a multifunctional synergistic additive of antimony oxide or other halogen flame retardants, can effectively improve the flame retardant performance, reduce the generation of smoke during combustion, and can adjust the chemical, mechanical, electrical and other properties of rubber and plastic products; the four substances are combined to form the auxiliary flame retardant, so that the excellent flame retardant property of the electric tracing band can be realized.

As a preference of this embodiment, the preparation method of the flame retardant material layer comprises the following steps:

the method comprises the following steps: preparing the addition amount of the components according to the composition proportion of the components in a corresponding proportion, and respectively and independently placing the components for later use after the preparation is finished;

step two: micronizing aluminum hydroxide, fully mixing with antimony trioxide to form an inorganic flame retardant material, doping an organic halide flame retardant into the mixed inorganic flame retardant material, and fully mixing the organic halide flame retardant and the mixed inorganic flame retardant material to form an organic-inorganic mixed flame retardant;

step three: fully grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber respectively to form powdery particles, and putting the powdery particles formed by grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber into a mixing device together for fully mixing to form a fiber flame retardant;

step four: placing diatomite, calcined argil and zinc borate together, fully stirring and mixing, then pouring a mixed liquid obtained by mixing silicone oil and pure water into the mixture, and fully stirring and mixing to form an auxiliary flame retardant;

step five: mixing the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant together, and fully stirring to fully and uniformly mix the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant to form a viscous flame retardant material;

step six: uniformly coating the viscous flame retardant material on the surface of the reinforced metal mesh at the outermost periphery of the electric tracing band, coating three layers till a compact flame retardant material layer is formed on the surface of the reinforced metal mesh, placing the electric tracing band coated with the flame retardant material in drying equipment for drying treatment, and drying and molding the flame retardant material layer completely.

Preferably, in the second step, the stirring speed of the mixing device is 300r/min when the aluminum hydroxide and the antimony trioxide are mixed, the temperature in the mixing device is maintained at 25 ℃, the mixing time is 15min, the stirring speed of the mixing device is 300r/min when the organic halide flame retardant and the inorganic flame retardant are mixed, the temperature in the mixing device is maintained at 22 ℃, and the mixing time is 18 min.

Preferably, in the third step, the temperature in the mincing device is maintained at 35 ℃ during the mincing process of the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber, the mincing time is 20min, the stirring speed of the mixing device is 350r/min when the powdery particles formed by mincing the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are mixed, the temperature in the mixing device is maintained at 32 ℃, and the mixing time is 20 min.

In the fourth step, it is preferable that the stirring speed of the mixing equipment is 250r/min, the temperature in the mixing equipment is maintained at 28 ℃ and the mixing time is 18min, the stirring speed of the mixing equipment is 250r/min, the temperature in the mixing equipment is maintained at 32 ℃ and the mixing time is 22 min.

Preferably, in the fifth step, when the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant are mixed, the stirring speed of the mixing equipment is 350r/min, the temperature in the mixing equipment is maintained at 35 ℃, and the mixing time is 30 min; in the sixth step, the coating thickness of the flame retardant material of each layer is not less than 0.05mm, the drying temperature of electric tracing after the flame retardant material is coated is maintained at 55 ℃, and the drying time is 35 min.

Example 2

The embodiment provides a fire-retardant type electric tracing band, including being located two tinned copper wires of inlayer, wrap up in the conductive layer that generates heat of the outlying PTC of tinned copper wire, wrap up in the conductive insulating layer that generates heat of PTC, wrap up in the insulating layer outlying metallic shield layer and be located outermost enhancement protection flame retardant coating, be located outermost enhancement protection flame retardant coating by strengthening the metal mesh and wrap up in the flame retardant material layer who strengthens the metal mesh surface and constitute.

Preferably, the flame retardant material layer is prepared from an organic-inorganic mixed flame retardant, a fiber flame retardant and an auxiliary flame retardant, wherein the ratio of the three components is as follows: 45% of organic-inorganic mixed flame retardant, 40% of fiber flame retardant and 15% of auxiliary flame retardant.

Preferably, the organic-inorganic hybrid flame retardant in this embodiment comprises an organic flame retardant material and an inorganic flame retardant material which are synergistically mixed, wherein the ratio of the organic flame retardant material to the inorganic flame retardant material is as follows: 45% of organic flame-retardant material and 55% of inorganic flame-retardant material, wherein the inorganic flame-retardant material adopts antimony trioxide and aluminum hydroxide, and the composition ratio of the antimony trioxide to the aluminum hydroxide is as follows: 45% of antimony trioxide and 55% of aluminum hydroxide, wherein the organic flame retardant material adopts an organic halide flame retardant, and the organic halide flame retardant adopts brominated polystyrene.

Antimony trioxide and aluminum hydroxide belong to inorganic compounds, have high melting points, and organic halide flame retardants also have high melting points, so that the antimony trioxide, the aluminum hydroxide and the organic halide flame retardants are matched for use, the chemical properties of the antimony trioxide, the aluminum hydroxide and the organic halide flame retardants can be effectively combined, and the excellent flame retardant performance can be realized.

Preferably, the fiber-based flame retardant of the present embodiment comprises the following components: the composite material comprises modified basalt fibers, polyphenylsulfone terephthalamide fibers and polycrystalline mullite fibers, wherein the modified basalt fibers, the polyphenylsulfone terephthalamide fibers and the polycrystalline mullite fibers are prepared from the following components in percentage by weight: 40% of modified basalt fiber, 35% of polyphenylsulfone terephthalamide fiber and 25% of polycrystalline mullite fiber.

The modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber have high melting points, the strength of the three substances is high, the fiber flame retardant formed by combining the three materials has various excellent performances of electric insulation, corrosion resistance, high temperature resistance and the like, and the flame retardant property of the whole electric tracing band can be effectively improved.

Preferably, the auxiliary flame retardant comprises the following components: diatomite, calcined argil, silicone oil, zinc borate and pure water, wherein the five components are as follows: 30% of diatomite, 25% of calcined argil, 20% of silicone oil, 18% of zinc borate and 7% of pure water.

The density of the diatomite is 1.9-2.3 g/cm3, the bulk density is 0.34-0.65 g/cm3, the specific surface area is 40-65 square meters per gram, and the pore volume is 0.45-0.98 cm³The water absorption is 2-4 times of the volume of the material per se, the melting point is 1650-1750 ℃, a special porous structure can be observed under an electron microscope, and the excellent physical properties determine that the material has excellent flame retardant performance; the calcined pottery clay has excellent freeze-thaw resistanceThe ceramic clay is frozen and thawed for 50 times at-45 ℃ without cracks, has good weather resistance and corrosion resistance, the internal structure of the ceramic clay is not easily affected by acidic substances, and the calcined clay also has higher melting point and excellent flame retardant property; the silicone oil has very small vapor pressure, higher flash point and ignition point and lower freezing point, has heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and smaller surface tension, and also has low viscosity-temperature coefficient and higher compression resistance; the zinc borate can be used as a multifunctional synergistic additive of antimony oxide or other halogen flame retardants, can effectively improve the flame retardant performance, reduce the generation of smoke during combustion, and can adjust the chemical, mechanical, electrical and other properties of rubber and plastic products; the four substances are combined to form the auxiliary flame retardant, so that the excellent flame retardant property of the electric tracing band can be realized.

As a preference of this embodiment, the preparation method of the flame retardant material layer comprises the following steps:

the method comprises the following steps: preparing the addition amount of the components according to the composition proportion of the components in a corresponding proportion, and respectively and independently placing the components for later use after the preparation is finished;

step two: micronizing aluminum hydroxide, fully mixing with antimony trioxide to form an inorganic flame retardant material, doping an organic halide flame retardant into the mixed inorganic flame retardant material, and fully mixing the organic halide flame retardant and the mixed inorganic flame retardant material to form an organic-inorganic mixed flame retardant;

step three: fully grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber respectively to form powdery particles, and putting the powdery particles formed by grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber into a mixing device together for fully mixing to form a fiber flame retardant;

step four: placing diatomite, calcined argil and zinc borate together, fully stirring and mixing, then pouring a mixed liquid obtained by mixing silicone oil and pure water into the mixture, and fully stirring and mixing to form an auxiliary flame retardant;

step five: mixing the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant together, and fully stirring to fully and uniformly mix the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant to form a viscous flame retardant material;

step six: uniformly coating the viscous flame retardant material on the surface of the reinforced metal mesh at the outermost periphery of the electric tracing band, coating three layers till a compact flame retardant material layer is formed on the surface of the reinforced metal mesh, placing the electric tracing band coated with the flame retardant material in drying equipment for drying treatment, and drying and molding the flame retardant material layer completely.

Preferably, in the second step, the stirring speed of the mixing device is 300r/min when the aluminum hydroxide and the antimony trioxide are mixed, the temperature in the mixing device is maintained at 30 ℃, the mixing time is 20min, the stirring speed of the mixing device is 300r/min when the organic halide flame retardant and the inorganic flame retardant are mixed, the temperature in the mixing device is maintained at 30 ℃, and the mixing time is 24 min.

Preferably, in the third step, the temperature in the mincing device is maintained at 40 ℃ during the mincing process of the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber, the mincing time is 25min, the stirring speed of the mixing device is 350r/min when the powdery particles formed by mincing the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are mixed, the temperature in the mixing device is maintained at 36 ℃, and the mixing time is 25 min.

In the fourth step, it is preferable that the rotational speed of the mixer is 250r/min, the temperature in the mixer is maintained at 33 ℃ for 22min, the rotational speed of the mixer is 250r/min, the temperature in the mixer is maintained at 35 ℃ for 25min, and the mixture is mixed with the silicone oil and pure water.

Preferably, in the fifth step, when the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant are mixed, the stirring speed of the mixing equipment is 350r/min, the temperature in the mixing equipment is maintained at 37 ℃, and the mixing time is 35 min; in the sixth step, the coating thickness of the flame retardant material of each layer is not less than 0.05mm, the drying temperature of electric tracing after the flame retardant material is coated is maintained at 65 ℃, and the drying time is 45 mm.

Example 3

The embodiment provides a fire-retardant type electric tracing band, including being located two tinned copper wires of inlayer, wrap up in the conductive layer that generates heat of the outlying PTC of tinned copper wire, wrap up in the conductive insulating layer that generates heat of PTC, wrap up in the insulating layer outlying metallic shield layer and be located outermost enhancement protection flame retardant coating, be located outermost enhancement protection flame retardant coating by strengthening the metal mesh and wrap up in the flame retardant material layer who strengthens the metal mesh surface and constitute.

Preferably, the flame retardant material layer is prepared from an organic-inorganic mixed flame retardant, a fiber flame retardant and an auxiliary flame retardant, wherein the ratio of the three components is as follows: 45% of organic-inorganic mixed flame retardant, 40% of fiber flame retardant and 15% of auxiliary flame retardant.

Preferably, the organic-inorganic hybrid flame retardant in this embodiment comprises an organic flame retardant material and an inorganic flame retardant material which are synergistically mixed, wherein the ratio of the organic flame retardant material to the inorganic flame retardant material is as follows: 45% of organic flame-retardant material and 55% of inorganic flame-retardant material, wherein the inorganic flame-retardant material adopts antimony trioxide and aluminum hydroxide, and the composition ratio of the antimony trioxide to the aluminum hydroxide is as follows: 45% of antimony trioxide and 55% of aluminum hydroxide, wherein the organic flame retardant material adopts an organic halide flame retardant, and the organic halide flame retardant adopts chlorinated paraffin and chlorinated polyethylene.

Antimony trioxide and aluminum hydroxide belong to inorganic compounds, have high melting points, and organic halide flame retardants also have high melting points, so that the antimony trioxide, the aluminum hydroxide and the organic halide flame retardants are matched for use, the chemical properties of the antimony trioxide, the aluminum hydroxide and the organic halide flame retardants can be effectively combined, and the excellent flame retardant performance can be realized.

Preferably, the fiber-based flame retardant of the present embodiment comprises the following components: the composite material comprises modified basalt fibers, polyphenylsulfone terephthalamide fibers and polycrystalline mullite fibers, wherein the modified basalt fibers, the polyphenylsulfone terephthalamide fibers and the polycrystalline mullite fibers are prepared from the following components in percentage by weight: 40% of modified basalt fiber, 35% of polyphenylsulfone terephthalamide fiber and 25% of polycrystalline mullite fiber.

The modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber have high melting points, the strength of the three substances is high, the fiber flame retardant formed by combining the three materials has various excellent performances of electric insulation, corrosion resistance, high temperature resistance and the like, and the flame retardant property of the whole electric tracing band can be effectively improved.

Preferably, the auxiliary flame retardant comprises the following components: diatomite, calcined argil, silicone oil, zinc borate and pure water, wherein the five components are as follows: 30% of diatomite, 25% of calcined argil, 20% of silicone oil, 18% of zinc borate and 7% of pure water.

The density of the diatomite is 1.9-2.3 g/cm3, the bulk density is 0.34-0.65 g/cm3, the specific surface area is 40-65 square meters per gram, and the pore volume is 0.45-0.98 cm³The water absorption is 2-4 times of the volume of the material per se, the melting point is 1650-1750 ℃, a special porous structure can be observed under an electron microscope, and the excellent physical properties determine that the material has excellent flame retardant performance; the calcined argil has excellent freeze-thaw resistance, can be frozen and thawed for 50 times at-45 ℃ without cracks, has good weather resistance and corrosion resistance, has an internal structure which is not easily influenced by acidic substances, and also has higher melting point and excellent flame retardant property; the silicone oil has very small vapor pressure, higher flash point and ignition point and lower freezing point, has heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and smaller surface tension, and also has low viscosity-temperature coefficient and higher compression resistance; the zinc borate can be used as a multifunctional synergistic additive of antimony oxide or other halogen flame retardants, can effectively improve the flame retardant performance, reduce the generation of smoke during combustion, and can adjust the chemical, mechanical, electrical and other properties of rubber and plastic products; the four substances are combined to form the auxiliary flame retardant, so that the excellent flame retardant property of the electric tracing band can be realized.

As a preference of this embodiment, the preparation method of the flame retardant material layer comprises the following steps:

the method comprises the following steps: preparing the addition amount of the components according to the composition proportion of the components in a corresponding proportion, and respectively and independently placing the components for later use after the preparation is finished;

step two: micronizing aluminum hydroxide, fully mixing with antimony trioxide to form an inorganic flame retardant material, doping an organic halide flame retardant into the mixed inorganic flame retardant material, and fully mixing the organic halide flame retardant and the mixed inorganic flame retardant material to form an organic-inorganic mixed flame retardant;

step three: fully grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber respectively to form powdery particles, and putting the powdery particles formed by grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber into a mixing device together for fully mixing to form a fiber flame retardant;

step four: placing diatomite, calcined argil and zinc borate together, fully stirring and mixing, then pouring a mixed liquid obtained by mixing silicone oil and pure water into the mixture, and fully stirring and mixing to form an auxiliary flame retardant;

step five: mixing the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant together, and fully stirring to fully and uniformly mix the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant to form a viscous flame retardant material;

step six: uniformly coating the viscous flame retardant material on the surface of the reinforced metal mesh at the outermost periphery of the electric tracing band, coating three layers till a compact flame retardant material layer is formed on the surface of the reinforced metal mesh, placing the electric tracing band coated with the flame retardant material in drying equipment for drying treatment, and drying and molding the flame retardant material layer completely.

Preferably, in the second step, the stirring speed of the mixing device is 300r/min when the aluminum hydroxide and the antimony trioxide are mixed, the temperature in the mixing device is maintained at 35 ℃ for 25min, the stirring speed of the mixing device is 300r/min when the organic halide flame retardant and the inorganic flame retardant are mixed, the temperature in the mixing device is maintained at 38 ℃ for 28 min.

Preferably, in the third step, the temperature in the mincing device is maintained at 45 ℃ during the mincing process of the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber, the mincing time is 30min, the stirring speed of the mixing device is 350r/min when the powdery particles formed by mincing the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are mixed, the temperature in the mixing device is maintained at 42 ℃, and the mixing time is 30 min.

In the fourth step, it is preferable that the stirring speed of the mixing equipment is 250r/min, the temperature in the mixing equipment is maintained at 36 ℃ and the mixing time is 26min, the stirring speed of the mixing equipment is 250r/min, the temperature in the mixing equipment is maintained at 38 ℃ and the mixing time is 28 min.

Preferably, in the fifth step, when the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant are mixed, the stirring speed of the mixing equipment is 350r/min, the temperature in the mixing equipment is maintained at 40 ℃, and the mixing time is 40 min; in the sixth step, the coating thickness of the flame retardant material of each layer is not less than 0.05mm, the drying temperature of electric tracing after the flame retardant material is coated is maintained at 75 ℃, and the drying time is 55 mm.

Comparative example 1

The comparative example provides a fire-retardant type electric tracing band, including two tinned copper wires that are located the inlayer, wrap up in the peripheral PTC conductive heating layer of tinned copper wire, wrap up in the peripheral insulating layer of the conductive heating layer of PTC, wrap up in the peripheral metallic shield layer of insulating layer and be located outermost enhancement protection flame retardant coating, be located outermost enhancement protection flame retardant coating by strengthening the metal mesh and wrap up in the flame retardant material layer who strengthens the metal mesh surface and constitute.

Preferably, the flame retardant material layer is prepared by mixing an organic-inorganic flame retardant and a fiber flame retardant, wherein the ratio of the two components is as follows: 50% of organic-inorganic mixed flame retardant and 50% of fiber flame retardant.

As the optimization of the comparative example, the organic-inorganic mixed flame retardant comprises the organic flame retardant material and the inorganic flame retardant material which are synergistically mixed, and the composition ratio of the organic flame retardant material to the inorganic flame retardant material is as follows: 45% of organic flame-retardant material and 55% of inorganic flame-retardant material, wherein the inorganic flame-retardant material adopts antimony trioxide and aluminum hydroxide, and the composition ratio of the antimony trioxide to the aluminum hydroxide is as follows: 45% of antimony trioxide and 55% of aluminum hydroxide, wherein the organic flame retardant material adopts an organic halide flame retardant, and the organic halide flame retardant adopts decabromodiphenyl acid.

As a preference of this comparative example, the fiber-based flame retardant comprises the following components: the composite material comprises modified basalt fibers, polyphenylsulfone terephthalamide fibers and polycrystalline mullite fibers, wherein the modified basalt fibers, the polyphenylsulfone terephthalamide fibers and the polycrystalline mullite fibers are prepared from the following components in percentage by weight: 40% of modified basalt fiber, 35% of polyphenylsulfone terephthalamide fiber and 25% of polycrystalline mullite fiber.

As a preference of this comparative example, the method of preparing the flame retardant material layer comprises the steps of:

the method comprises the following steps: preparing the addition amount of the components according to the composition proportion of the components in a corresponding proportion, and respectively and independently placing the components for later use after the preparation is finished;

step two: micronizing aluminum hydroxide, fully mixing with antimony trioxide to form an inorganic flame retardant material, doping an organic halide flame retardant into the mixed inorganic flame retardant material, and fully mixing the organic halide flame retardant and the mixed inorganic flame retardant material to form an organic-inorganic mixed flame retardant;

step three: fully grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber respectively to form powdery particles, and putting the powdery particles formed by grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber into a mixing device together for fully mixing to form a fiber flame retardant;

step four: mixing the organic-inorganic mixed flame retardant and the fiber flame retardant together, adding water, and fully stirring to fully and uniformly mix the organic-inorganic mixed flame retardant, the fiber flame retardant and the water to form a viscous flame retardant material;

step five: uniformly coating the viscous flame retardant material on the surface of the reinforced metal mesh at the outermost periphery of the electric tracing band, coating three layers till a compact flame retardant material layer is formed on the surface of the reinforced metal mesh, placing the electric tracing band coated with the flame retardant material in drying equipment for drying treatment, and drying and molding the flame retardant material layer completely.

As a preferred example of this comparative example, in the second step, the stirring speed of the mixing apparatus was 300r/min, the temperature in the mixing apparatus was maintained at 29 ℃ for 19min, the stirring speed of the mixing apparatus was 300r/min, the temperature in the mixing apparatus was maintained at 30 ℃ for 24min, and the inorganic flame retardant was mixed.

Preferably, in the third step, the temperature in the mincing equipment is kept at 39 ℃ during the mincing process of the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber, the mincing time is 26min, the stirring speed of the mixing equipment is 350r/min when the powdery particles formed by mincing the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are mixed, the temperature in the mixing equipment is kept at 36 ℃, and the mixing time is 24 min.

Preferably, in the fourth step, when the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant are mixed, the stirring speed of the mixing equipment is 350r/min, the temperature in the mixing equipment is maintained at 37 ℃, and the mixing time is 36 min; in the fifth step, the coating thickness of the flame retardant material of each layer is not less than 0.05mm, the drying temperature of electric tracing after the flame retardant material is coated is maintained at 62 ℃, and the drying time is 46 mm.

Comparative example 2

The comparative example provides a fire-retardant type electric tracing band, including two tinned copper wires that are located the inlayer, wrap up in the peripheral PTC conductive heating layer of tinned copper wire, wrap up in the peripheral insulating layer of the conductive heating layer of PTC, wrap up in the peripheral metallic shield layer of insulating layer and be located outermost enhancement protection flame retardant coating, be located outermost enhancement protection flame retardant coating by strengthening the metal mesh and wrap up in the flame retardant material layer who strengthens the metal mesh surface and constitute.

Preferably, the flame retardant material layer is prepared from an organic-inorganic mixed flame retardant and an auxiliary flame retardant, wherein the ratio of the three components is as follows: 75% of organic-inorganic mixed flame retardant and 25% of auxiliary flame retardant.

As the optimization of the comparative example, the organic-inorganic mixed flame retardant comprises the organic flame retardant material and the inorganic flame retardant material which are synergistically mixed, and the composition ratio of the organic flame retardant material to the inorganic flame retardant material is as follows: 45% of organic flame-retardant material and 55% of inorganic flame-retardant material, wherein the inorganic flame-retardant material adopts antimony trioxide and aluminum hydroxide, and the composition ratio of the antimony trioxide to the aluminum hydroxide is as follows: 45% of antimony trioxide and 55% of aluminum hydroxide, wherein the organic flame retardant material adopts an organic halide flame retardant, and the organic halide flame retardant adopts chlorinated paraffin and chlorinated polyethylene.

As a preference of this comparative example, the auxiliary flame retardant comprises the following ingredients: diatomite, calcined argil, silicone oil, zinc borate and pure water, wherein the five components are as follows: 30% of diatomite, 25% of calcined argil, 20% of silicone oil, 18% of zinc borate and 7% of pure water.

As a preference of this comparative example, the method of preparing the flame retardant material layer comprises the steps of:

the method comprises the following steps: preparing the addition amount of the components according to the composition proportion of the components in a corresponding proportion, and respectively and independently placing the components for later use after the preparation is finished;

step two: micronizing aluminum hydroxide, fully mixing with antimony trioxide to form an inorganic flame retardant material, doping an organic halide flame retardant into the mixed inorganic flame retardant material, and fully mixing the organic halide flame retardant and the mixed inorganic flame retardant material to form an organic-inorganic mixed flame retardant;

step three: placing diatomite, calcined argil and zinc borate together, fully stirring and mixing, then pouring a mixed liquid obtained by mixing silicone oil and pure water into the mixture, and fully stirring and mixing to form an auxiliary flame retardant;

step four: mixing the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant together, and fully stirring to fully and uniformly mix the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant to form a viscous flame retardant material;

step five: uniformly coating the viscous flame retardant material on the surface of the reinforced metal mesh at the outermost periphery of the electric tracing band, coating three layers till a compact flame retardant material layer is formed on the surface of the reinforced metal mesh, placing the electric tracing band coated with the flame retardant material in drying equipment for drying treatment, and drying and molding the flame retardant material layer completely.

As a preferred example of this comparative example, in the second step, the stirring speed of the mixing apparatus was 300r/min, the temperature in the mixing apparatus was maintained at 30 ℃ for 30min, the stirring speed of the mixing apparatus was 300r/min, the temperature in the mixing apparatus was maintained at 30 ℃ for 25min, and the inorganic flame retardant was mixed with the organohalide flame retardant.

In the third step, the mixing speed of the mixing equipment is 250r/min, the temperature in the mixing equipment is maintained at 32 ℃ for 22min, the mixing speed of the mixing equipment is 250r/min, the temperature in the mixing equipment is maintained at 35 ℃ for 24.5 min.

Preferably, in the fourth step, when the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant are mixed, the stirring speed of the mixing equipment is 350r/min, the temperature in the mixing equipment is maintained at 38 ℃, and the mixing time is 36 min; in the fifth step, the coating thickness of the flame retardant material of each layer is not less than 0.05mm, the drying temperature of electric tracing after the flame retardant material is coated is maintained at 63 ℃, and the drying time is 46 mm.

Comparative example 3

The comparative example provides a fire-retardant type electric tracing band, including two tinned copper wires that are located the inlayer, wrap up in the peripheral PTC conductive heating layer of tinned copper wire, wrap up in the peripheral insulating layer of the conductive heating layer of PTC, wrap up in the peripheral metallic shield layer of insulating layer and be located outermost enhancement protection flame retardant coating, be located outermost enhancement protection flame retardant coating by strengthening the metal mesh and wrap up in the flame retardant material layer who strengthens the metal mesh surface and constitute.

As a preferred example of the present comparative example, the flame retardant material layer is prepared from a fiber flame retardant and an auxiliary flame retardant, wherein the ratio of the three components is as follows: 75% of fiber flame retardant and 25% of auxiliary flame retardant.

As a preference of this comparative example, the fiber-based flame retardant comprises the following components: the composite material comprises modified basalt fibers, polyphenylsulfone terephthalamide fibers and polycrystalline mullite fibers, wherein the modified basalt fibers, the polyphenylsulfone terephthalamide fibers and the polycrystalline mullite fibers are prepared from the following components in percentage by weight: 40% of modified basalt fiber, 35% of polyphenylsulfone terephthalamide fiber and 25% of polycrystalline mullite fiber.

As a preference of this comparative example, the auxiliary flame retardant comprises the following ingredients: diatomite, calcined argil, silicone oil, zinc borate and pure water, wherein the five components are as follows: 30% of diatomite, 25% of calcined argil, 20% of silicone oil, 18% of zinc borate and 7% of pure water.

As a preference of this comparative example, the method of preparing the flame retardant material layer comprises the steps of:

the method comprises the following steps: preparing the addition amount of the components according to the composition proportion of the components in a corresponding proportion, and respectively and independently placing the components for later use after the preparation is finished;

step two: fully grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber respectively to form powdery particles, and putting the powdery particles formed by grinding the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber into a mixing device together for fully mixing to form a fiber flame retardant;

step three: placing diatomite, calcined argil and zinc borate together, fully stirring and mixing, then pouring a mixed liquid obtained by mixing silicone oil and pure water into the mixture, and fully stirring and mixing to form an auxiliary flame retardant;

step four: mixing the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant together, and fully stirring to fully and uniformly mix the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant to form a viscous flame retardant material;

step five: uniformly coating the viscous flame retardant material on the surface of the reinforced metal mesh at the outermost periphery of the electric tracing band, coating three layers till a compact flame retardant material layer is formed on the surface of the reinforced metal mesh, placing the electric tracing band coated with the flame retardant material in drying equipment for drying treatment, and drying and molding the flame retardant material layer completely.

Preferably, in the second step, the temperature in the mincing equipment is maintained at 40 ℃ during the mincing process of the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber, the mincing time is 25min, the stirring speed of the mixing equipment is 350r/min when the powdery particles formed by mincing the modified basalt fiber, the polyphenylsulfone terephthalamide fiber and the polycrystalline mullite fiber are mixed, the temperature in the mixing equipment is maintained at 37 ℃, and the mixing time is 26 min.

In the third step, the mixing speed of the mixing device is 250r/min, the temperature in the mixing device is maintained at 32 ℃ for 22min, the mixing speed of the mixing device is 250r/min, the temperature in the mixing device is maintained at 35 ℃ for 24 min.

Preferably, in the fourth step, when the organic-inorganic mixed flame retardant, the fiber flame retardant and the auxiliary flame retardant are mixed, the stirring speed of the mixing equipment is 350r/min, the temperature in the mixing equipment is maintained at 37.5 ℃, and the mixing time is 35 min; in the fifth step, the coating thickness of the flame retardant material of each layer is not less than 0.05mm, the drying temperature of electric tracing after the flame retardant material is coated is maintained at 60 ℃, and the drying time is 45 mm.

Experimental tests were respectively performed on the electric tracing tapes prepared in examples 1 to 3 and the electric tracing tape prepared in comparative example 1, and the experimental data were obtained as follows:

from the experimental data, the electric tracing band without the auxiliary flame retardant is obviously reduced in flame retardant property compared with the electric tracing band added with the auxiliary flame retardant, so that the auxiliary flame retardant is one of key factors for playing a flame retardant role in the invention, but still has a very obvious flame retardant property advantage compared with the traditional electric tracing band.

Experimental tests were respectively performed on the electric tracing tapes prepared in examples 1 to 3 and the electric tracing tape prepared in comparative example 2, and the experimental data were obtained as follows:

from the experimental data, the electric tracing band lacking the fiber flame retardant is obviously reduced in flame retardant performance compared with the electric tracing band added with the fiber flame retardant, so that the fiber flame retardant is one of key factors playing a role in flame retardant performance in the invention, but still has a very obvious flame retardant performance advantage compared with the traditional electric tracing band.

Experimental tests were respectively performed on the electric tracing tapes prepared in examples 1 to 3 and the electric tracing tape prepared in comparative example 3, and the experimental data were obtained as follows:

from the experimental data, the electric tracing band lacking the organic-inorganic mixed flame retardant is obviously reduced in flame retardant performance compared with the electric tracing band added with the organic-inorganic mixed flame retardant, so that the organic-inorganic mixed flame retardant is one of key factors playing a role in flame retardant performance in the invention, but still has a very obvious flame retardant performance advantage compared with the traditional electric tracing band.

In conclusion, the flame-retardant electric tracing band provided by the invention has more obvious advantages in the aspect of flame retardant property compared with the traditional electric tracing band.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.