阅读说明：本技术 一种隔热防火电缆及其制备方法 (Heat-insulation fireproof cable and preparation method thereof ) 是由 张伟强 罗进 于 2021-06-22 设计创作，主要内容包括：本发明涉及电缆技术领域,更具体地说,本发明提供了一种隔热防火电缆,包括多个缆芯,多个所述缆芯的外部包覆外隔热层；所述外隔热层均用于为缆芯隔热,其中所述外隔热层包括复合隔热层、预留通道和温感反应球,所述复合隔热层沿圆周方向间隔开设有若干个朝内隔热层设置的散热通孔；所述预留通道设有多个且位于相邻两个散热通孔之间,用于将相邻两个散热通孔连通；所述温感反应球由可变形的热胀冷缩材料制成且设置在预留通道中,所述温感反应球的两侧均与活动设置在预留通道中的复合隔热条连接；通过在复合隔热层开设的若干个散热通孔能够为缆芯提供良好的散热环境。(The invention relates to the technical field of cables, in particular to a heat-insulation fireproof cable which comprises a plurality of cable cores, wherein outer heat-insulation layers are coated outside the cable cores; the outer heat insulation layers are used for insulating the cable core, each outer heat insulation layer comprises a composite heat insulation layer, a reserved channel and a temperature-sensitive reaction ball, and a plurality of heat dissipation through holes arranged towards the inner heat insulation layer are formed in the composite heat insulation layers at intervals along the circumferential direction; the reserved channels are arranged between two adjacent heat dissipation through holes and are used for communicating the two adjacent heat dissipation through holes; the temperature-sensitive reaction ball is made of a deformable thermal expansion and contraction material and is arranged in the reserved channel, and two sides of the temperature-sensitive reaction ball are connected with the composite heat insulation strips movably arranged in the reserved channel; a plurality of heat dissipation through-holes that offer through compound insulating layer can provide good heat dissipation environment for the cable core.)

1. A heat-insulation fireproof cable comprises a plurality of cable cores, and is characterized in that an outer heat-insulation layer for insulating the cable cores is coated outside the plurality of cable cores; the outer insulating layer includes:

the composite heat insulation layer is provided with a plurality of heat dissipation through holes towards the inner heat insulation layer at intervals along the circumferential direction;

the reserved channel is provided with a plurality of heat dissipation through holes and is positioned between every two adjacent heat dissipation through holes, and the reserved channel is used for communicating the two adjacent heat dissipation through holes; and

the temperature-sensitive reaction ball is made of a deformable thermal expansion and contraction material and is arranged in the reserved channel, and two sides of the temperature-sensitive reaction ball are connected with the composite heat insulation strips movably arranged in the reserved channel;

when the composite heat insulation layer is exposed to fire, the temperature-sensitive reaction ball is heated and expanded, and then the temperature-sensitive reaction ball deforms to drive the composite heat insulation strip to move towards the heat dissipation through hole and seal the heat dissipation through hole.

2. The insulated fireproof cable of claim 1, wherein the temperature-sensitive reaction ball comprises:

the flexible outer layer is made of flexible materials and is arranged in a limiting hole formed in the reserved channel; and

the thermal expansion filler is filled in the flexible outer layer and can expand under heat.

3. The insulated fireproof cable of claim 1, further comprising a reinforcing winding layer disposed between the cable core and the outer insulating layer, wherein the reinforcing winding layer is configured to enhance the wear resistance of the cable core.

4. A thermally insulated fireproof cable according to claim 3, further comprising an inner insulation layer disposed between the reinforcing wrap and the outer insulation layer for insulating the reinforcing wrap and the outer insulation layer from each other.

5. The insulated fireproof cable of claim 4, wherein the inner insulating layer comprises, in order:

the ceramic silicon rubber layer is sleeved on the periphery of the reinforcing winding layer; and

and the fire retardant layer is sleeved on the periphery of the ceramic silicon rubber layer and is in contact with the composite heat insulation layer.

6. The insulated fireproof cable of any one of claims 1-5, wherein the cable core comprises:

a conductor for conducting electricity; and

and the insulating layer is sleeved on the periphery of the conductor and used for insulating the conductor.

7. The insulated fireproof cable of claim 6, wherein an anti-corrosion layer is further disposed between the insulating layer and the outer insulating layer.

8. The heat-insulating fireproof cable according to claim 1, wherein the composite heat-insulating layer and/or the composite heat-insulating strip are made of materials comprising, in weight percent: 35-50wt% of polystyrene, 7-19wt% of formaldehyde, 5-12wt% of polyphenyl ether, 3-9wt% of an alkali catalyst and 30-55wt% of organic silicon resin.

9. The insulated fireproof cable of claim 8, wherein the composite insulating layer and/or the composite insulating strip comprises, in weight percent: 38-45wt% of polystyrene, 7-9wt% of formaldehyde, 5-10wt% of polyphenyl ether, 6-8wt% of an alkali catalyst and 40-52wt% of organic silicon resin.

10. A method for preparing a heat-insulating fireproof cable according to any one of claims 1 to 9, comprising the steps of:

a heat dissipation through hole and a reserved channel are formed in the composite heat insulation layer;

pushing temperature-sensitive reaction balls with composite heat insulation strips connected to the two sides into a reserved channel of the composite heat insulation layer in a low-temperature environment to obtain the composite heat insulation layer;

and covering the composite heat insulation layer at the periphery of the cable core to obtain the heat insulation fireproof cable.

Technical Field

The invention relates to the technical field of cables, in particular to a heat-insulating fireproof cable and a preparation method thereof.

Background

The cable is formed by twisting a plurality of mutually insulated conductors and is used for power or information interaction, the cable is generally erected aloft or buried underground and is used for long-distance high-voltage power transmission, and each cable is generally responsible for power transmission of a plurality of strands of lines, so that the transmission efficiency is high, the manufacturing cost is low, and the stability is good.

The cable core of traditional cable can produce the heat at the in-process that uses, and the effect of traditional cable core for playing protection waterproof fire prevention all can play the fire-proof waterproof material of guard action with cable core cladding multilayer to lead to the cable core to lead to the local too high of being heated because the heat dissipation condition is poor, thereby influence cable wholeness ability, in case the cable damages, not only can cause huge economic loss, gives people the life and brings very big inconvenience.

Disclosure of Invention

The invention aims to provide a heat-insulating fireproof cable and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a heat-insulation fireproof cable comprises a plurality of cable cores, wherein outer heat-insulation layers for insulating the cable cores are coated outside the cable cores; the outer insulating layer includes:

the composite heat insulation layer is provided with a plurality of heat dissipation through holes towards the inner heat insulation layer at intervals along the circumferential direction;

the reserved channel is provided with a plurality of heat dissipation through holes and is positioned between every two adjacent heat dissipation through holes, and the reserved channel is used for communicating the two adjacent heat dissipation through holes; and

the temperature-sensitive reaction ball is made of a deformable thermal expansion and contraction material and is arranged in the reserved channel, and two sides of the temperature-sensitive reaction ball are connected with the composite heat insulation strips movably arranged in the reserved channel;

when the composite heat insulation layer is exposed to fire, the temperature-sensitive reaction ball is heated and expanded, and then the temperature-sensitive reaction ball deforms to drive the composite heat insulation strip to move towards the heat dissipation through hole and seal the heat dissipation through hole.

The application adopts a further technical scheme that: the temperature-sensitive reaction ball comprises:

the flexible outer layer is made of flexible materials and is arranged in a limiting hole formed in the reserved channel; and

the thermal expansion filler is filled in the flexible outer layer and can expand under heat.

The application adopts a further technical scheme that: the cable further comprises a reinforcing winding layer arranged between the cable core and the outer heat insulation layer, and the reinforcing winding layer is used for enhancing the wear resistance of the cable core.

The application adopts a further technical scheme that: the cable further comprises an inner heat insulation layer, wherein the inner heat insulation layer is arranged between the cable core and the outer heat insulation layer and used for insulating heat between the reinforcing winding layer and the outer heat insulation layer.

The application adopts a further technical scheme that: the inner heat insulation layer comprises the following components in sequence:

the ceramic silicon rubber layer is sleeved on the periphery of the reinforcing winding layer; and

and the fire retardant layer is sleeved on the periphery of the ceramic silicon rubber layer and is in contact with the composite heat insulation layer.

The application adopts a further technical scheme that: the cable core includes:

a conductor for conducting electricity; and

and the insulating layer is sleeved on the periphery of the conductor and used for insulating the conductor.

The application adopts a further technical scheme that:

and an anticorrosive layer is also arranged between the insulating layer and the outer heat-insulating layer.

The application adopts a further technical scheme that: the composite heat insulation layer and the composite heat insulation strip are made of the following materials in percentage by weight: 35-50wt% of polystyrene, 7-19wt% of formaldehyde, 5-12wt% of polyphenyl ether, 3-9wt% of an alkali catalyst and 30-55wt% of organic silicon resin.

The application adopts a further technical scheme that: the composite heat insulation layer and/or the composite heat insulation strip comprises the following materials in percentage by weight: 38-45wt% of polystyrene, 7-9wt% of formaldehyde, 5-10wt% of polyphenyl ether, 6-8wt% of an alkali catalyst and 40-52wt% of organic silicon resin.

The invention also provides the following technical scheme:

a preparation method of the heat-insulating fireproof cable comprises the following steps:

a heat dissipation through hole and a reserved channel are formed in the composite heat insulation layer;

pushing temperature-sensitive reaction balls with composite heat insulation strips connected to the two sides into a reserved channel of the composite heat insulation layer in a low-temperature environment to obtain the composite heat insulation layer;

and covering the composite heat insulation layer at the periphery of the cable core to obtain the heat insulation fireproof cable.

Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following beneficial effects:

according to the embodiment of the invention, the plurality of heat dissipation through holes formed in the composite heat insulation layer can provide a good heat dissipation environment for the cable core, and when a fire disaster occurs externally, the composite heat insulation strip is driven to move towards the heat dissipation through holes through deformation to seal the heat dissipation through holes under the action of expansion with heat and contraction with cold of the temperature-sensitive reaction ball when the fire disaster occurs, so that the cable core is protected. The problem of traditional cable core lead to the local too high that is heated because the heat dissipation condition is poor to influence cable overall performance is solved.

Drawings

FIG. 1 is a schematic structural diagram of a heat-insulating fireproof cable according to an embodiment of the present invention;

fig. 2 is an enlarged schematic structural view of a position a in the heat-insulating fireproof cable according to the embodiment of the present invention.

The reference numerals in the schematic drawings illustrate:

1-cable core, 101-conductor, 102-insulating layer, 2-anticorrosive layer, 3-reinforcing winding layer, 4-inner heat insulation layer, 401-ceramic silicon rubber layer, 402-fire retardant layer, 5-outer heat insulation layer, 501-composite heat insulation layer, 502-heat dissipation through hole, 503-composite heat insulation strip, 504-reserved through groove and 505-temperature-sensitive reaction ball.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the 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 obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention, and the present invention is further described with reference to the embodiments below.

Referring to fig. 1-2, in an embodiment of the present application, a thermal insulation fireproof cable includes a plurality of cable cores 1, and a thermal insulation layer 5 for insulating the cable cores 1 from heat is coated outside the plurality of cable cores 1; the outer insulating layer 5 includes:

the composite heat insulation layer 501 is provided with a plurality of heat dissipation through holes 502 arranged towards the inner heat insulation layer 4 at intervals along the circumferential direction;

a plurality of reserve channels 504, which are located between two adjacent heat dissipation through holes 502 and are used for communicating two adjacent heat dissipation through holes 502; and

the temperature-sensitive reaction ball 505 is made of deformable thermal expansion and contraction materials and is arranged in the reserved channel 504, and two sides of the temperature-sensitive reaction ball 505 are connected with the composite heat insulation strips 503 movably arranged in the reserved channel 504;

when the composite heat insulation layer 501 is exposed to fire, the temperature-sensitive reaction ball 505 is heated and expanded, and the temperature-sensitive reaction ball 505 deforms to drive the composite heat insulation strip 503 to move towards the heat dissipation through hole 502 and seal the heat dissipation through hole 502.

It should be noted that the composite thermal insulation strip 503 is connected to the temperature-sensitive reaction ball 505 by means of gluing.

During practical application, a plurality of heat dissipation through-hole 502 that sets up can provide good radiating environment for cable core 1, and when external conflagration breaing out, the temperature of external world is sensed temperature and is reacted ball 505 department, and temperature sensing reaction ball 505 is heated and expands to temperature sensing reaction ball 505 deformation drives compound heat insulating strip 503 towards heat dissipation through-hole 502 motion, when two compound heat insulating strip 503 motions to mutual contact or overlap, can be sealed with heat dissipation through-hole 502.

Preferably, a magnetic member and a magnetic member may be respectively disposed on opposite sides of the two oppositely disposed composite heat insulation strips 503, so that when the temperature-sensitive reaction ball 505 expands due to heat to push the two composite heat insulation strips 503 to move, the two composite heat insulation strips 503 are brought into rapid contact and seal the heat dissipation through hole 502 by the action of the magnetic force. And when the temperature is reduced to a certain degree at room temperature, the magnetic member is separated from the magnetic member by the cold contraction action of the temperature-sensitive reaction ball 505.

In one case of the embodiment, a reinforcing winding layer 3 for enhancing the abrasion resistance of the cable core 1; the reinforcing winding layer 3 is arranged between the cable core 1 and the outer heat insulation layer 5; the reinforcing winding layer 3 can be a tinned copper wire braid or a fiber braid.

Preferably, the reinforcing winding layer 3 is woven by tinned copper wires, the tinned copper wires are woven to have high mechanical strength, and the overall strength of the cable can be improved, so that the tensile property and the compressive resistance of the cable are improved, and the service life of the cable is prolonged.

According to the embodiment of the invention, the plurality of heat dissipation through holes 502 formed in the composite heat insulation layer can provide a good heat dissipation environment for the cable core 1, and when a fire disaster occurs externally, the composite heat insulation strip 503 is driven to move towards the heat dissipation through holes 502 to seal the heat dissipation through holes 502 through deformation under the action of expansion with heat and contraction with cold of the temperature-sensitive reaction ball 505, so that the cable core 1 is protected. The problem of traditional cable core lead to the local too high that is heated because the heat dissipation condition is poor to influence cable overall performance is solved.

Referring to fig. 1-2, as a preferred embodiment of the present application, the temperature-sensitive reaction ball 505 includes:

the flexible outer layer is made of flexible materials and is arranged in a limiting hole formed in the reserved channel 504; and

the thermal expansion filler is filled in the flexible outer layer and can expand under heat.

In practical applications, the flexible outer layer is provided to facilitate the deformation of the thermal expansion filler to push the composite thermal insulation strips 503 when the thermal expansion filler expands due to heat. The thermally expandable filler may be a gas, liquid or solid having the property of expanding with heat and contracting with cold.

In this embodiment, the flexible outer layer may be a shell material of a thermal expansion ball in the prior art, and this embodiment is not limited.

Preferably, the temperature-sensitive reaction ball 505 selected in this embodiment is a thermal expansion ball in the prior art.

Preferably, the thermally expandable filler is a gas, because the gas has the best thermal expansion properties.

Referring to fig. 1, as another preferred embodiment of the present application, an inner insulation layer 4 is further included, and the inner insulation layer 4 is disposed between the reinforcing winding layer 3 and the outer insulation layer 5 for insulating the reinforcing winding layer 3 and the outer insulation layer 5.

In one aspect of the present embodiment, the inner insulating layer 4 includes, in order:

a ceramic silicon rubber layer 401 sleeved on the periphery of the reinforced winding layer 3; and

and the fire retardant layer 402 is sleeved on the periphery of the ceramic silicon rubber layer 401 and is in contact with the composite heat insulation layer 501.

In this embodiment, the ceramic silicone rubber layer 401 plays a role in heat insulation and flame retardation between the cable core 1 and the outer heat insulation layer 5, and simultaneously avoids the heat generation of the cable core 1 from affecting the expansion with heat and contraction with cold of the temperature-sensitive reaction ball 505.

In this embodiment, the fire barrier layer 402 material may be a dispersion of high flame retardant glass fibers or expandable graphite in a polyisocyanate polymer matrix; preferably, the high-flame-retardant glass fiber is selected, and has the advantages of good insulativity, strong heat resistance, good corrosion resistance, high mechanical strength and high tensile strength.

Preferably, the inner thermal insulation layer 4 further comprises a thermal insulation latex layer arranged at the periphery of the fire barrier layer 402.

Referring to fig. 1, as another preferred embodiment of the present application, the cable core 1 includes:

a conductor 101 for conducting electricity; and

and the insulating layer 102 is sleeved on the periphery of the conductor 101 and arranged in the reinforcing winding layer 3 for insulating the conductor.

Preferably, an anticorrosive layer 2 is further disposed between the insulating layer 102 and the outer heat insulation layer 5.

In practical applications, the conductor 101 may be aluminum alloy or copper with good conductivity, and the material of the insulating layer is not particularly limited, and may have an insulating function.

In this embodiment, the anticorrosive layer 2 may be an anticorrosive paint, and preferably, an epoxy coal tar pitch paint or a polyethylene trimer anticorrosive paint in the prior art may be selected.

The embodiment of the invention also provides a preparation method of the heat-insulation fireproof cable, wherein the composite heat-insulation layer 501 and/or the composite heat-insulation strip 503 comprise the following materials in percentage by weight: 35-50wt% of polystyrene, 7-19wt% of formaldehyde, 5-12wt% of polyphenyl ether, 3-9wt% of an alkali catalyst and 30-55wt% of organic silicon resin.

Preferably, the weight percentage of the polystyrene is 38-45%, the weight percentage of the formaldehyde is 7-9%, the weight percentage of the polyphenylene oxide is 5-10%, the weight percentage of the alkali catalyst is 6-8%, and the weight percentage of the organic silicon resin is 40-52%.

In this embodiment, the silicone resin may be selected from polymethyl silicone resin or polyethyl silicone resin.

In this embodiment, the alkali catalyst is not particularly limited, and sodium hydroxide or potassium hydroxide may be preferably used.

In the embodiment, polystyrene and polyphenylene oxide are raw materials for preparing a cable thermal insulation layer in the prior art, and are also raw materials for preparing thermoplastic resin, formaldehyde is added into the base, and under the condition of a large amount of formaldehyde, thermosetting resin is generated under the action of an alkali catalyst, so that the hardness of the composite thermal insulation layer 501 and the composite thermal insulation strip 503 is enhanced, and the deformation of the composite thermal insulation layer 501 and the composite thermal insulation strip 503 due to high temperature cannot be caused to influence the deformation efficiency of the extrusion temperature-sensitive reaction ball 505 even in the case of a fire; the high-temperature resistance of the composite heat insulation layer 501 and the composite heat insulation strips 503 can be enhanced by adding the organic silicon resin into the raw materials.

The embodiment of the invention also provides a preparation method of the heat-insulation fireproof cable, which comprises the following steps:

preparing a conductor 101 by adopting aluminum alloy or copper through smelting, continuous casting and rolling, wire drawing, annealing and stranding;

coating the insulating layer 102 and then cabling to obtain a cable core 1;

tightly arranging a plurality of cable cores 1 which are extruded and insulated, and positioning the cable cores through lantern rings;

coating a reticular reinforced winding layer 3 made of aluminum alloy on the periphery of the cable core 1;

extruding the inner heat insulation layer 4 on the periphery of the cable core 1 coated with the reinforced winding layer 3 by using an extruder, wherein the extrusion temperature is 53-66 ℃;

a heat dissipation through hole and a reserved channel 504 are formed in the composite heat insulation layer 501;

pushing a temperature-sensitive reaction ball 505 which is cold-shrunk and connected with a composite heat insulation strip 503 into a reserved channel 504 of a composite heat insulation layer 501 at the temperature of-2-5 ℃ to obtain a composite heat insulation layer 5; and

and coating the composite heat insulation layer 501 on the periphery of the cable core 1 to obtain the heat insulation cable.

The present invention will now be described with reference to the following examples of a method for manufacturing the composite thermal insulation layer 501.

Example 1

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene and 5g of polyphenyl ether are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 2

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: taking 40g of polystyrene, 7g of formaldehyde, 5g of polyphenyl ether and 7g of alkali catalyst (sodium hydroxide) as raw materials, putting the raw materials into an internal mixer, and fully mixing for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 3

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene, 7g of formaldehyde, 10g of polyphenyl ether and 7g of alkali catalyst (sodium hydroxide) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 4

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene, 7g of formaldehyde, 5g of polyphenyl ether, 7g of an alkali catalyst (sodium hydroxide) and 30g of organic silicon resin (polyethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 5

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene, 7g of formaldehyde, 10g of polyphenyl ether, 7g of an alkali catalyst (sodium hydroxide) and 30g of organic silicon resin (polyethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 6

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 38g of polystyrene, 7g of formaldehyde, 5g of polyphenyl ether, 6g of alkali catalyst (potassium hydroxide) and 44g of organic silicon resin (polyethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 7

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 38g of polystyrene, 7g of formaldehyde, 9g of polyphenyl ether, 6g of alkali catalyst (potassium hydroxide) and 40g of organic silicon resin (polyethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 8

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 42g of polystyrene, 7g of formaldehyde, 5g of polyphenyl ether, 6g of alkali catalyst (potassium hydroxide) and 40g of organic silicon resin (polymethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 9

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: the raw materials of 39g of polystyrene, 7g of formaldehyde, 9g of polyphenyl ether, 6g of alkali catalyst (potassium hydroxide) and 39g of organic silicon resin (polymethyl silicon resin) are put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 10

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene, 7g of formaldehyde, 10g of polyphenyl ether, 8g of alkali catalyst (sodium hydroxide) and 29g of organic silicon resin (polymethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 11

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene, 10g of formaldehyde, 12g of polyphenyl ether, 8g of alkali catalyst (sodium hydroxide) and 30g of organic silicon resin (polyethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 12

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene, 12g of formaldehyde, 12g of polyphenyl ether, 6g of alkali catalyst (sodium hydroxide) and 30g of organic silicon resin (polyethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 13

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene, 16g of formaldehyde, 5g of polyphenyl ether, 9g of alkali catalyst (sodium hydroxide) and 30g of organic silicon resin (polymethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 14

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: 40g of polystyrene, 19g of formaldehyde, 9g of polyphenyl ether, 3g of alkali catalyst (potassium hydroxide) and 30g of organic silicon resin (polymethyl silicon resin) are taken as raw materials and put into an internal mixer to be fully mixed for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

Example 15

The preparation of the composite thermal insulation layer 501 in this embodiment includes the following steps: taking 38g of polystyrene, 7g of formaldehyde, 12g of polyphenyl ether, 3g of alkali catalyst (potassium hydroxide) and 40g of organic silicon resin (polymethyl silicon resin) as raw materials, putting into an internal mixer, and fully mixing for 15min at the temperature of 190 ℃. Preheating the mixture in a flat vulcanizing machine at 210 ℃ for 5min, cold-pressing for 10min to normal temperature, and taking out to obtain the composite heat insulation layer 501.

And (3) testing the combustion grade: the samples obtained in examples 1 to 15 were each subjected to a combustion test in a LTAO horizontal vertical combustion tester according to the standard of fire rating UL94, and the results are shown in the following table.

As can be seen from the data in the following table, the samples obtained by the technical scheme of the application have high-efficiency flame retardance.

Examples	Polystyrene/g	Formaldehyde/g	Polyphenylene ether/g	Basic catalyst/g	Silicone resin/g	UL94
							Example 1	40		5			V-2
Example 2	40	7	5	7		V-1
							Example 3	40	7	10	7		V-1
Example 4	40	7	5	7	30	V-0
							Example 5	40	7	10	7	30	V-0
Example 6	38	7	5	6	44	V-0
							Example 7	38	7	9	6	40	V-0
Example 8	42	7	5	6	40	V-0
							Example 9	39	7	9	6	39	V-0
Example 10	40	7	10	8	29	V-0
							Example 11	40	10	12	8	30	V-0
Example 12	40	12	12	6	30	V-0
							Example 13	40	16	5	9	30	V-0
Example 14	40	19	9	3	30	V-0
							Example 15	38	7	12	3	40	V-0

*: the flame retardant rating is V-2< V-1< V-0; NC is the flame-retardant-free grade.

As described above, the addition of the silicone resin can improve the overall flame retardancy.

Example 7

Testing the heat distortion temperature: the samples obtained in examples 4 to 15 were tested for Heat Distortion Temperature (HDT) using an XWB-300FA heat distortion, Vicat softening point temperature tester. The results are shown in the following table.

As can be seen from the data in the following table, the samples obtained by the technical scheme of the application all have heat distortion resistance.

As can be seen from the table, in the case where the ratio of formaldehyde to polyphenylene ether is proportional and the amount of silicone resin is larger, the sample has higher heat distortion resistance and is less likely to be distorted, thereby enabling the thermally expandable temperature-sensitive reaction ball 505 to be crushed and deformed in the case of a fire.

Meanwhile, the added organic silicon resin can also add the whole heat resistance, and the organic silicon resin is also the main raw material of the thermosetting resin, so that the heat deformation temperature of the obtained heat insulation cable is improved.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.