阅读说明：本技术 一种超低导热系数玻璃纤维纳米毡及其制备方法 (Ultralow-thermal-conductivity-coefficient glass fiber nano-felt and preparation method thereof ) 是由 沈亚平 袁宝华 许如庆 黄振振 冯钒 于 2020-12-02 设计创作，主要内容包括：本发明涉及一种超低导热系数玻璃纤维纳米毡及其制备方法,其特征在于：其中制备方法包括以下步骤：S1：配白水、S2：配制浆料、S3：湿毡坯成型、S4：淋粘接剂浆、S5：干燥固化、S6：收卷成品。本发明制备的超低导热系数玻璃纤维纳米毡的导热系数低于0.022w/m.k,其具有低导热系数、隔音降噪、防腐性能好等优点。(The invention relates to a glass fiber nano-felt with ultra-low thermal conductivity and a preparation method thereof, which is characterized in that: the preparation method comprises the following steps: s1: water blending, S2: preparing slurry, S3: wet mat forming, S4: pouring adhesive slurry, S5: drying and curing, S6: and (6) rolling a finished product. The glass fiber nano-felt with the ultralow heat conductivity coefficient prepared by the invention has the heat conductivity coefficient lower than 0.022w/m.k, and has the advantages of low heat conductivity coefficient, sound insulation, noise reduction, good corrosion resistance and the like.)

1. The glass fiber nano-felt with the ultralow heat conductivity coefficient is characterized in that: the paint is prepared by drying the following components in parts by mass: 30-90 parts of alkali-free glass fiber chopped yarns, 0.1-70 parts of nano powder and 0.1-70 parts of binder, wherein the length of the alkali-free glass fiber chopped yarns is 6-18mm, and the diameter of the alkali-free glass fiber chopped yarns is 8-15 mu m.

2. A preparation method of a glass fiber nano-felt with an ultralow heat conductivity coefficient is characterized by comprising the following steps: the method comprises the following steps:

s1: preparing white water: adding a certain amount of tap water, a thickening agent, a surfactant and a defoaming agent into a stirring tank respectively, and mixing through a stirring mechanism in the stirring tank to form white water;

s2: preparing slurry: uniformly dispersing the glass fiber chopped yarns into white water to form slurry;

s3: and (3) forming a wet felt blank: diluting the pulp prepared in the step S2 with white water, feeding the pulp into a head box of a forming machine through a white water filter dehydrator by a feeding pump, and then forming fibers on a forming net to prepare a wet felt blank;

s4: adhesive slurry spraying: transferring the wet felt blank from the forming net to a sizing net of a sizing machine, and uniformly dipping and spraying adhesive slurry on the wet felt blank through a sizing machine to obtain a glass fiber felt blank;

s5: drying and curing: sending the glass fiber felt blank subjected to glue spraying into a drying and curing furnace, and drying and curing the binder to obtain a cured finished product;

s6: and (3) rolling a finished product: and winding the cured finished product into a fixed-length cylinder shape by a double-station automatic winding machine to obtain the finished product.

3. The preparation method of the ultra-low thermal conductivity glass fiber nano-mat as claimed in claim 2, characterized in that: step S2: preparing slurry: the method comprises the following steps:

a1: firstly, putting ionized water into a stirrer, then adding hydroxyethyl cellulose to ensure that the viscosity of the water is 9-20cp, then adding a dispersing agent and a defoaming agent, wherein the content of the dispersing agent is 400-800ppm, the content of the defoaming agent is 400-800ppm, the dispersing agent is alkyl dimethyl benzyl ammonium salt type, and the defoaming agent is polydimethylsiloxane;

a2: and then adding the glass fiber chopped yarns into a stirrer, stirring and dispersing for 30-120min, wherein the weight ratio of the glass fiber chopped yarns to the ionized water in the stirrer is 1: 3-1: 10.

4. the preparation method of the ultra-low thermal conductivity glass fiber nano-mat as claimed in claim 2, characterized in that: the stirrer in the step A1 comprises an outer barrel (1), an inner barrel (2), a sealing cover (4) and a stirring and crushing mechanism, wherein the inner barrel is arranged in the outer barrel and is connected with a motor (3) at the bottom in the outer barrel, the inner barrel is driven to rotate by the motor, the sealing cover is connected to the top of the outer barrel through a lifting mechanism, the sealing cover is also connected with a pressure pipe (8), the bottom in the inner barrel is also provided with a pressure valve (5), the stirring and crushing mechanism comprises a servo motor (6), a rotating shaft (16), a stirring frame body (15), a fixed shaft (18) and a crushing wheel (17), the servo motor is arranged at the top of the sealing cover and is connected with the rotating shaft, the rotating shaft penetrates through the sealing cover to extend into the inner barrel, and the rotating shaft in the inner barrel is connected with two stirring frame bodies, the stirring frame body be the U type, the upper and lower both ends of fixed axle fix between the both sides wall of stirring frame body, the fixed axle from the top down install five crushing wheels in proper order.

5. The method for preparing the ultra-low thermal conductivity glass fiber nano-mat according to claim 5, characterized in that: elevating system include second servo motor (12), lead screw (14), activity (13), uide bushing (11) and guide bar (9), second servo motor install on the left side outer wall of outer barrel, the lead screw link to each other with second servo motor, sealed lid connect on the lead screw through the activity, the right side outer wall of outer barrel on be fixed with a backup pad (10), the guide bar vertical fix in the backup pad, sealed lid pass through uide bushing swing joint on the guide bar.

6. The method for preparing the ultra-low thermal conductivity glass fiber nano-mat according to claim 5, characterized in that: the stirring device is characterized in that a piston sealing head (7) is further rotatably connected to the rotating shaft above the stirring frame body, the piston sealing head is connected in the inner cylinder body in a piston mode, and the piston sealing head rotates around the rotating shaft under the driving of the inner cylinder body.

7. The method for preparing the ultra-low thermal conductivity glass fiber nano-mat according to claim 5, characterized in that: the pressure valve comprises a valve body (5-1), a valve core (5-2), a first spring (5-6), an electric cylinder (5-3) and a push plate (5-11), the valve body is fixed at the bottom of an inner barrel, the lower end of the valve body is open and communicated with an outer barrel, the upper end of the valve body is sealed, the valve core is connected in the valve body through the first spring, the side wall of the valve body is provided with a discharge port (5-5), the discharge port is communicated with the inner barrel, the inner wall of the valve body above the discharge port is provided with a groove (5-10), the groove is internally connected with a trapezoidal clamping head (5-9) through a second spring (5-8), the side wall of the valve core is provided with a clamping groove matched with the trapezoidal clamping head, and the trapezoidal clamping head is clamped into the clamping groove under the action of the second spring, the trapezoidal clamping head is fixed at the sealing end of the valve body, and the push plate is movably connected in the valve body and connected with the electric cylinder.

8. The preparation method of the ultra-low thermal conductivity glass fiber nano-mat as claimed in claim 2, characterized in that: the adhesive slurry in the step S4 may be composed of an acrylic adhesive, an epoxy adhesive, a polyester adhesive, a polyvinyl acetate adhesive and nano-powder, and the ratio of the adhesive to the nano-powder is 1:100-100: 1.

9. The preparation method of the ultra-low thermal conductivity glass fiber nano-mat as claimed in claim 2, characterized in that: the drying temperature in the step S5 is 110-210 ℃, and the time is 1-5 min.

Technical Field

The invention relates to the technical field of building materials, in particular to a glass fiber nano-felt with an ultralow heat conductivity coefficient and a preparation method thereof.

Background

Nowadays, the glass fiber has the following characteristics: moisture-proof, fire-proof, high-strength, and good bonding with gypsum. But the glass fiber wet-process thin felt is obtained by secondary production, which comprises the production of the glass fiber felt and the surface coating of the glass fiber felt. And the method must produce qualified glass fiber wet felt first, then put on the coating and scraping line to carry on the secondary processing, the productive speed of wet felt can reach 80-90 m/min generally, and the productive speed of coating and scraping line can reach about 20m/min only, so a wet felt line needs 4-5 coating and scraping lines to match, so the cost, energy consumption will be greatly improved, the production efficiency has reduced a lot. And the application of the glass fiber nano-felt in the field of buildings is more and more extensive nowadays, and the heat-insulating materials of the buildings such as polystyrene foam boards, glass wool and the like have high heat conductivity and poor heat-insulating effect at present, so that the application of the glass fiber nano-felt is limited.

Disclosure of Invention

The invention provides an ultralow-thermal-conductivity-coefficient glass fiber nano-felt which has the advantages of low thermal conductivity, sound insulation, noise reduction, good corrosion resistance and the like through a specific proportion.

In order to solve the technical problem, the invention provides an ultralow-thermal-conductivity-coefficient glass fiber nano-mat which is characterized in that: the paint is prepared by drying the following components in parts by mass: 30-90 parts of alkali-free glass fiber chopped yarns, 0.1-70 parts of nano powder and 0.1-70 parts of binder, wherein the length of the alkali-free glass fiber chopped yarns is 6-18mm, and the diameter of the alkali-free glass fiber chopped yarns is 8-15 mu m.

The invention also provides a preparation method of the glass fiber nano-felt with the ultralow heat conductivity coefficient, which is characterized by comprising the following steps: the method comprises the following steps:

s1: preparing white water: adding a certain amount of tap water, a thickening agent, a surfactant and a defoaming agent into a stirring tank respectively, and mixing through a stirring mechanism in the stirring tank to form white water;

s2: preparing slurry: uniformly dispersing the glass fiber chopped yarns into white water to form slurry;

s3: and (3) forming a wet felt blank: diluting the pulp prepared in the step S2 with white water, feeding the pulp into a head box of a forming machine through a white water filter dehydrator by a feeding pump, and then forming fibers on a forming net to prepare a wet felt blank;

s4: adhesive slurry spraying: transferring the wet felt blank from the forming net to a sizing net of a sizing machine, and uniformly dipping and spraying adhesive slurry on the wet felt blank through a sizing machine to obtain a glass fiber felt blank;

s5: drying and curing: sending the glass fiber felt blank subjected to glue spraying into a drying and curing furnace, and drying and curing the binder to obtain a cured finished product;

s6: and (3) rolling a finished product: and winding the cured finished product into a fixed-length cylinder shape by a double-station automatic winding machine to obtain the finished product.

Further: step S2: preparing slurry: the method comprises the following steps:

a1: firstly, putting ionized water into a stirrer, then adding hydroxyethyl cellulose to ensure that the viscosity of the water is 9-20cp, then adding a dispersing agent and a defoaming agent, wherein the content of the dispersing agent is 400-800ppm, the content of the defoaming agent is 400-800ppm, the dispersing agent is alkyl dimethyl benzyl ammonium salt type, and the defoaming agent is polydimethylsiloxane;

a2: and then adding the glass fiber chopped yarns into a stirrer, stirring and dispersing for 30-120min, wherein the weight ratio of the glass fiber chopped yarns to the ionized water in the stirrer is 1: 3-1: 10.

and further: the stirrer in the step A1 comprises an outer barrel, an inner barrel, a sealing cover and a stirring and crushing mechanism, wherein the inner barrel is arranged in the outer barrel and is connected with a motor at the bottom in the outer barrel, the inner barrel is driven to rotate by the motor, the sealing cover is connected to the top of the outer barrel through a lifting mechanism, the sealing cover is also connected with a pressure pipe, the bottom in the inner barrel is also provided with a pressure valve, the stirring and crushing mechanism comprises a servo motor, a rotating shaft, a stirring frame body, a fixed shaft and a crushing wheel, the servo motor is arranged at the top of the sealing cover and is connected with the rotating shaft, the rotating shaft penetrates through the sealing cover to extend into the inner barrel, the rotating shaft in the inner barrel is connected with two stirring frame bodies, the stirring frame bodies are U-shaped, and the upper end and the lower end of the fixed shaft are fixed between two side walls of the stirring frame bodies, the fixed shaft is sequentially provided with five crushing wheels from top to bottom.

And further: elevating system include second servo motor, lead screw, activity, uide bushing and guide bar, second servo motor install on the left side outer wall of outer barrel, the lead screw link to each other with second servo motor, sealed lid connect on the lead screw through the activity, the right side outer wall of outer barrel on be fixed with a backup pad, the guide bar vertically fix in the backup pad, sealed lid pass through uide bushing swing joint on the guide bar.

And further: the rotating shaft above the stirring frame body is also rotatably connected with a piston sealing head, the piston sealing head is connected in the inner cylinder body in a piston mode, and the piston sealing head rotates around the rotating shaft under the driving of the inner cylinder body.

And further: the pressure valve include valve body, case, first spring, electronic jar and push pedal, the valve body fix the bottom at interior barrel, the lower extreme of valve body be and open the form and be linked together with outer barrel, the upper end of valve body be sealed form, the case in through first spring coupling in the valve body, the lateral wall of valve body on seted up the earial drainage mouth, earial drainage mouth and interior barrel be linked together, the inner wall of the valve body of earial drainage mouth top on seted up flutedly, the recess in have trapezoidal dop through second spring coupling, the lateral wall of case on seted up with trapezoidal dop assorted draw-in groove, trapezoidal dop block go into under the effect of second spring in the draw-in groove, trapezoidal dop fix the sealed end at the valve body, push pedal swing joint in the valve body and link to each other with electronic jar.

And further: the adhesive slurry in the step S4 may be composed of an acrylic adhesive, an epoxy adhesive, a polyester adhesive, a polyvinyl acetate adhesive and nano-powder, and the ratio of the adhesive to the nano-powder is 1:100-100: 1.

And further: the drying temperature in the step S5 is 110-210 ℃, and the time is 1-5 min.

After the structure is adopted, the thermal conductivity coefficient of the glass fiber nano-felt prepared by the specific proportion is lower than 0.022w/m.k, so that the glass fiber nano-felt has the advantages of low thermal conductivity coefficient, sound insulation, noise reduction, good corrosion resistance and the like; and the mixer that this design adopted has kibbling function, makes the raw materials mixed more completely, has increased its practicality.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a structural view of a mixer.

Fig. 2 is a structural view of the pressure valve.

Fig. 3 is an enlarged view of a in fig. 2.

Detailed Description

The invention provides an ultralow-thermal-conductivity-coefficient glass fiber nano-felt which is prepared by drying the following components in parts by mass: 30-90 parts of alkali-free glass fiber chopped yarns, 0.1-70 parts of nano powder and 0.1-70 parts of binder, wherein the length of the alkali-free glass fiber chopped yarns is 6-18mm, and the diameter of the alkali-free glass fiber chopped yarns is 8-15 mu m.

The invention also provides a preparation method of the glass fiber nano-felt with the ultralow heat conductivity coefficient, which is characterized by comprising the following steps: the method comprises the following steps:

s1: preparing white water: adding a certain amount of tap water, a thickening agent, a surfactant and a defoaming agent into a stirring tank respectively, and mixing through a stirring mechanism in the stirring tank to form white water;

s2: preparing slurry: uniformly dispersing the glass fiber chopped yarns into white water to form slurry;

s3: and (3) forming a wet felt blank: diluting the pulp prepared in the step S2 with white water, feeding the pulp into a head box of a forming machine through a white water filter dehydrator by a feeding pump, and then forming fibers on a forming net to prepare a wet felt blank;

s4: adhesive slurry spraying: transferring the wet felt blank from the forming net to a sizing net of a sizing machine, and uniformly dipping and spraying adhesive slurry on the wet felt blank through a sizing machine to obtain a glass fiber felt blank;

s5: drying and curing: sending the glass fiber felt blank subjected to glue spraying into a drying and curing furnace, and drying and curing the binder to obtain a cured finished product;

s6: and (3) rolling a finished product: and winding the cured finished product into a fixed-length cylinder shape by a double-station automatic winding machine to obtain the finished product.

The above step S2: preparing slurry: the method comprises the following steps:

a1: firstly, putting ionized water into a stirrer, then adding hydroxyethyl cellulose to ensure that the viscosity of the water is 9-20cp, and then adding a dispersing agent and a defoaming agent, wherein the content of the dispersing agent is 400-800ppm and the content of the defoaming agent is 400-800ppm, the dispersing agent is alkyl dimethyl benzyl ammonium salt type, and the defoaming agent is polydimethylsiloxane;

a2: and then adding the glass fiber chopped yarns into a stirrer, stirring and dispersing for 30-120min, wherein the weight ratio of the glass fiber chopped yarns to the ionized water in the stirrer is 1: 3-1: 10.

the stirrer in step a1 shown in fig. 1 comprises an outer cylinder 1, an inner cylinder 2, a sealing cover 4, and a stirring and crushing mechanism, wherein the inner cylinder is arranged in the outer cylinder and connected with a motor 3 at the bottom in the outer cylinder, the inner cylinder is driven by the motor to rotate, the sealing cover is connected with the top of the outer cylinder through a lifting mechanism, the sealing cover is further connected with a pressure pipe 8, the bottom in the inner cylinder is further provided with a pressure valve 5, the stirring and crushing mechanism comprises a servo motor 6, a rotating shaft 16, a stirring frame 15, a fixed shaft 18 and a crushing wheel 17, the servo motor is arranged at the top of the sealing cover and connected with the rotating shaft, the rotating shaft penetrates through the sealing cover and extends into the inner cylinder, the rotating shaft in the inner cylinder is connected with two stirring frames, the stirring frames are U-shaped, and the upper end and the lower end of the fixed shaft are fixed between two side walls of the stirring frames, the fixed shaft is sequentially provided with five crushing wheels from top to bottom.

As shown in fig. 1, the lifting mechanism comprises a second servo motor 12, a screw rod 14, a flexible rod 13, a guide sleeve 11 and a guide rod 9, the second servo motor is installed on the outer wall of the left side of the outer cylinder body, the screw rod is connected with the second servo motor, a sealing cover is connected to the screw rod through the flexible rod, a supporting plate 10 is fixed on the outer wall of the right side of the outer cylinder body, the guide rod is vertically fixed on the supporting plate, and the sealing cover is movably connected to the guide rod through the guide sleeve.

A piston sealing head 7 is also rotatably connected to the rotating shaft above the stirring frame body as shown in fig. 1, the piston sealing head is connected in the inner cylinder body in a piston manner, and the piston sealing head rotates around the rotating shaft under the driving of the inner cylinder body.

The pressure valve shown in fig. 2 and 3 comprises a valve body 5-1, a valve core 5-2, a first spring 5-6, an electric cylinder 5-3 and a push plate 5-11, wherein the valve body is fixed at the bottom of an inner cylinder body, the lower end of the valve body is open and communicated with an outer cylinder body, the upper end of the valve body is sealed, the valve core is connected in the valve body through the first spring, the side wall of the valve body is provided with a discharge port 5-5, the discharge port is communicated with the inner cylinder body, the inner wall of the valve body above the discharge port is provided with a groove 5-10, the groove is internally connected with a trapezoidal clamping head 5-9 through a second spring 5-8, the side wall of the valve core is provided with a clamping groove matched with the trapezoidal clamping head, and the trapezoidal clamping head is clamped into the clamping groove under the action of the second spring, the trapezoidal clamping head is fixed at the sealing end of the valve body, and the push plate is movably connected in the valve body and connected with the electric cylinder.

The adhesive slurry in the step S4 may be an acrylic adhesive, an epoxy adhesive, a polyester adhesive, a polyvinyl acetate adhesive, and a nano powder, and the ratio of the adhesive to the nano powder is 1:100-100: 1.

The drying temperature in the step S5 is 110-210 ℃, and the time is 1-5 min.

In conclusion, the glass fiber nano-felt prepared by the specific proportion has the heat conductivity coefficient lower than 0.022w/m.k, so that the glass fiber nano-felt has the advantages of low heat conductivity coefficient, sound insulation, noise reduction, good corrosion resistance and the like; and the mixer that this design adopted has kibbling function, makes the raw materials mixed more completely, has increased its practicality.

Example one

Step S2 in the first embodiment: the slurry preparation method comprises the steps of firstly adding ionized water into a stirrer, then adding hydroxyethyl cellulose to enable the viscosity of water to be 12cp, and then adding a dispersing agent and a defoaming agent, wherein the content of the dispersing agent is 500ppm, and the content of the defoaming agent is 500 ppm; adding glass fiber chopped yarns with the diameter of 10 microns and the length of 6mm into a stirrer, stirring and dispersing for 30min, wherein the weight ratio of the glass fiber chopped yarns to the ionized water in the stirrer is 1: 5; spreading the stirred and dispersed glass fiber chopped yarn on a mesh belt, dewatering, spraying binder slurry, and drying at 120 deg.C for 2 min. The binder pulp is prepared from acrylic binder and nano powder in a ratio of 1:1, and the weight ratio of the alkali-free glass fiber chopped yarn to the binder pulp is 1: 1; the heat conductivity coefficient of the product is 0.010 w/m.k.

Example two

Step S2 in example two: the slurry preparation method comprises the steps of firstly adding ionized water into a stirrer, then adding hydroxyethyl cellulose to enable the viscosity of water to be 18cp, and then adding a dispersing agent and a defoaming agent, wherein the content of the dispersing agent is 600ppm, and the content of the defoaming agent is 500 ppm; adding glass fiber chopped yarns with the diameter of 8 mu m and the length of 8mm into a stirrer, stirring and dispersing for 35min, wherein the weight ratio of the glass fiber chopped yarns to the ionized water in the stirrer is 1: 4; spreading the stirred and dispersed glass fiber chopped yarn on a mesh belt, dewatering, spraying a binder, and drying at 120 ℃ for 2 min. The adhesive slurry is prepared from an epoxy adhesive and nano powder in a ratio of 2:1, and the weight ratio of the alkali-free glass fiber chopped yarn to the adhesive slurry is 2: 1; the heat conductivity coefficient of the product is 0.005 w/m.k.

EXAMPLE III

Step S2 in example three: the slurry preparation method comprises the steps of firstly adding ionized water into a stirrer, then adding hydroxyethyl cellulose to enable the viscosity of water to be 10cp, and then adding a dispersing agent and a defoaming agent, wherein the content of the dispersing agent is 700ppm, and the content of the defoaming agent is 400 ppm; adding glass fiber chopped yarns with the diameter of 10 mu m and the length of 8mm into a stirrer, stirring and dispersing for 40min, wherein the weight ratio of the glass fiber chopped yarns to the ionized water in the stirrer is 1: 6; spreading the stirred and dispersed glass fiber chopped yarn on a mesh belt, dewatering, spraying binder slurry, and drying at 130 deg.C for 2 min. Wherein the binder pulp is prepared from polyvinyl acetate binder and nano powder in a ratio of 3:1, and the weight ratio of the alkali-free glass fiber chopped yarn to the binder pulp is 3: 1; the heat conductivity coefficient of the product is 0.022 w/m.k.