A method for manufacturing a four-fluorine suspension resin modified filled foamed plate

Abstract

The application relates to the technical field of plate manufacturing, and particularly discloses a manufacturing method of a four-fluorine suspension resin modified filling foaming plate. The manufacturing method of the four-fluorine suspension resin modified filling foaming plate comprises the following steps: raw material mixing: stirring and uniformly mixing four-fluorine suspension resin fine powder, silicon dioxide and camphor powder to obtain a mixture; pre-pressing forming: first applying pressure to the mixture to obtain a pre-product A; then placing the pre-product A to obtain a pre-product B; high-temperature treatment: foaming and plasticizing the pre-product B under heating to obtain a pre-product C; then cooling the pre-product C to obtain a pre-product D; rotary cutting and sheeting: heating the pre-product D, constant-temperature standing, then sheeting to obtain the foaming plate.

Description

Technical Field

[0001] The present application relates to the technical field of board production, and in particular to a method for producing a polyfluoroethylene suspension resin modified and filled foam board. Background Art

[0002] The demand for high-performance sheet materials is growing across numerous industrial sectors, including construction, aerospace, and other industries. Traditional sheet materials often struggle to meet the strength, lightweight, and specialized performance requirements of complex working conditions and high-end applications. While polytetrafluoroethylene (PTFE) suspension resins offer excellent chemical stability and corrosion resistance, simple polytetrafluoroethylene (PTFE) sheet materials still have shortcomings in certain areas, such as their resistance to deformation. To improve the overall performance of sheet materials, developing a foamed sheet with strong deformation resistance and high strength is crucial. Summary of the Invention

[0003] In order to improve the deformation resistance of the foam board, the present application provides a method for manufacturing a polytetrafluoroethylene suspension resin modified and filled foam board.

[0004] The present application provides a method for manufacturing a polytetrafluoroethylene suspension resin modified and filled foam board, which adopts the following technical solution: A method for manufacturing a polytetrafluoroethylene suspension resin modified and filled foam board, comprising the following steps:

[0005] Raw material mixing: stir and mix the polytetrafluoroethylene suspension resin fine powder, silicon dioxide and camphor powder to obtain a mixture;

[0006] Pre-pressing: first, apply pressure to the mixture to obtain preform A; then, place preform A to obtain preform B; high-temperature treatment: foam and plasticize preform B under heating conditions to obtain preform C; then, cool preform C to obtain preform D;

[0007] Rotary cutting: The preform D is heated and allowed to stand at a constant temperature, and then sliced ​​to obtain a foamed board.

[0008] By adopting the above technical solution, silicon dioxide is added to the raw materials, which can improve the mechanical properties of the board. The camphor powder will volatilize during the subsequent high-temperature treatment process, and the gaps left during the volatilization process will form a foaming structure, thereby achieving lightweighting of the board and also making the board have higher resistance to deformation. The process steps of this production method are relatively simple, and the processes at each stage are easy to control. From raw material mixing to final rotary cutting, the entire process has high operability and stability, can realize large-scale industrial production, and reduce production costs.

[0009] In a specific embodiment, the fineness of the tetrafluoroethylene suspension resin powder is 200-250 microns.

[0010] By adopting the above technical solution, the fineness of the polytetrafluoroethylene suspension resin powder is preferably 200-250 microns. The polytetrafluoroethylene suspension resin powder in this fineness range can ensure better mixing with other additives during subsequent processing and is conducive to forming a uniform board structure.

[0011] In a specific embodiment, in the raw material mixing step, the mass fraction of the silicon dioxide in the tetrafluoroethylene suspension resin fine powder is 8-12%; the mass fraction of the camphor powder in the tetrafluoroethylene suspension resin fine powder is 5-6%.

[0012] By adopting the above technical solution, the addition amounts of silicon dioxide and camphor powder are further limited, thereby further improving the performance of the foamed board.

[0013] In a specific embodiment, in the raw material mixing step, the stirring speed is 100-300 r / min and the time is 30-60 min.

[0014] By adopting the above technical solution, the stirring speed and time during mixing are further limited, so that various raw materials can be mixed evenly to form a mixing system with stable performance.

[0015] In a specific embodiment, the pre-pressing step is: first, apply 150-200 kg / cm 2 The pre-pressure is applied to obtain pre-product A; then the pre-product A is placed for 24 hours to obtain pre-product B.

[0016] By adopting the above technical solution, the 2 The loose raw materials can be initially compacted within the pressure range to form a prefabricated product with a certain shape and strength; then placed for 24 hours, the molecular structure inside the raw materials will be further adjusted and stabilized, so that the shape and performance of the prefabricated product will be initially stabilized, preparing for the subsequent high-temperature treatment process.

[0017] In a specific embodiment, the high-temperature treatment step is: adding preform B to an oven, slowly heating it to 24-150°C over 10 hours, then maintaining the temperature and exhausting for 10-80 hours; then slowly heating it to 320°C over 15 hours, and maintaining the temperature at 320°C for 15 hours; then gradually heating it to 375°C over 5 hours, and maintaining the temperature at 375°C for 20 hours to obtain preform C; slowly cooling preform C to 320°C over 5 hours, and maintaining the temperature at 320°C for 15 hours; then slowly cooling it to 250°C over 5 hours, and maintaining the temperature at 250°C for 8 hours; finally, slowly cooling it to 100°C over 10 hours, maintaining the temperature at 100°C for 8 hours, and then slowly cooling it to room temperature to obtain preform D.

[0018] By adopting the above technical solution, the preform B is first placed in an oven and slowly heated to 24-150°C in 10 hours. The slow heating process can avoid stress concentration or other defects inside the preform B caused by rapid temperature changes. At this temperature, the temperature is kept constant and exhaust is exhausted for 10-80 hours. The camphor powder gradually evaporates. As the camphor powder evaporates, uniformly distributed foaming voids are formed inside the board, thereby realizing the foaming process of the board; the temperature is slowly raised to 320°C in 15 hours. This heating process is relatively gentle, which is conducive to further adjustment and optimization of the internal structure of the board. The molecular chain inside the board is further strengthened by keeping the temperature constant at 320°C for 15 hours. Movement and reorganization can enhance the interaction between molecules; the temperature is increased to 375℃ in steps of 5h. The step-by-step heating method can make the plate gradually adapt to temperature changes at different temperature stages and reduce the adverse effects caused by sudden temperature changes. The temperature is kept constant at 375℃ for 20h to fully plasticize the tetrafluoroethylene suspension resin and better combine with fillers such as silica to form a stable plate structure and further improve the performance of the plate; finally, the temperature is slowly lowered. The entire cooling process is relatively slow and carried out in stages. The purpose is to fully release the internal stress of the plate during the cooling process to avoid defects such as cracks in the plate caused by rapid cooling, thereby ensuring the stability of the plate performance.

[0019] In a specific embodiment, the rotary cutting step is as follows: heating the preform D to 80-100° C. and keeping it at a constant temperature for 24 hours, and then slicing it to obtain a foamed board.

[0020] By adopting the above technical solution, the preform D is first heated to 80-100°C before slicing and left to stand at a constant temperature for 24 hours. This heating process can further eliminate the residual stress inside the product, while making the product's hardness and toughness more suitable for rotary cutting.

[0021] In a specific embodiment, the raw material mixing step is: stirring and mixing tetrafluoroethylene suspension resin fine powder, silicon dioxide, camphor powder, carbon fiber, calcium sulfate whisker, silane-modified molybdenum disulfide graphene filler, titanate coupling agent, and polytetrafluoroethylene powder to obtain a mixture.

[0022] By adopting the above technical scheme, carbon fibers, calcium sulfate whiskers, silane-modified molybdenum disulfide graphene fillers, titanate coupling agents, and polytetrafluoroethylene powder are further added to the raw materials, and the carbon fibers and calcium sulfate whiskers form a rigid-flexible composite reinforcement system. The carbon fibers provide macroscopic skeleton support, the whiskers fill microscopic voids, and the silicon dioxide forms a dense transition layer at the interface. The silane on the surface of the silane-modified molybdenum disulfide graphene filler and the titanate coupling agent can reduce the interfacial energy difference. The layered structure of molybdenum disulfide and the two-dimensional characteristics of graphene form a sliding-bearing composite system, which dissipates energy through lamellar slip during creep. At the same time, the high modulus characteristics of graphene inhibit the plastic deformation of the matrix. The polytetrafluoroethylene powder and camphor powder form a gradient volatilization system, which produces an ordered pore structure during high-temperature treatment. Combined with the restraining effect of the carbon fibers, a three-dimensional stress buffer network is formed, thereby further improving the deformation resistance of the foam board.

[0023] In a specific embodiment, the pre-pressing step is: first, apply 220-250kg / cm 2 The pre-pressure is applied to obtain pre-product A; then the pre-product A is placed for 24 hours to obtain pre-product B.

[0024] In a specific embodiment, the preparation method of the silane-modified molybdenum disulfide graphene filler comprises the following steps:

[0025] First, γ-aminopropyltriethoxysilane, ethanol, and water are stirred evenly to obtain a modified solution;

[0026] Molybdenum disulfide and nanographene are added into a high-speed mixer and mixed to obtain a mixture. During the stirring process, a modifying liquid is slowly sprayed into the mixture. After spraying, the mixture is continuously stirred and dried to obtain a silane-modified molybdenum disulfide graphene filler.

[0027] By adopting the above technical solution, γ-aminopropyltriethoxysilane is first dissolved in ethanol to obtain a modified liquid, and then the modified liquid is sprayed while stirring molybdenum disulfide and nanographene, and then dried, so that the γ-aminopropyltriethoxysilane coats the molybdenum disulfide and nanographene to obtain a silane-modified molybdenum disulfide graphene filler.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. In this application, silicon dioxide is added to the polytetrafluoroethylene suspension resin fine powder raw material to improve the mechanical properties of the board. The camphor powder will volatilize during the subsequent high-temperature treatment process, and the gaps left during the volatilization process will form a foaming structure, thereby achieving lightweighting of the board and also making the board have higher deformation resistance. The production method has relatively simple process steps, and the processes at each stage are easy to control. From raw material mixing to final rotary cutting, the entire process has high operability and stability, can achieve large-scale industrial production, and reduce production costs.

[0030] 2. In this application, the pressure is between 150-200 kg / cm 2 The loose raw materials can be initially compacted within the pressure range to form a prefabricated product with a certain shape and strength; then placed for 24 hours, the molecular structure inside the raw materials will be further adjusted and stabilized, so that the shape and performance of the prefabricated product are initially stabilized, preparing for the subsequent high-temperature treatment process;

[0031] 3. In this application, before slicing, the preform D is first heated to 80-100°C and kept at a constant temperature for 24 hours. This heating process can further eliminate the residual stress inside the product, while making the hardness and toughness of the product reach a state more suitable for rotary cutting. DETAILED DESCRIPTION

[0032] The present application is further described in detail below with reference to the embodiments.

[0033] All raw materials in the examples are commercially available. The polytetrafluoroethylene suspension resin powder is available as DF-102 from Shandong Dongyue Polymer Materials Co., Ltd.; the carbon fibers are 0.5 mm chopped strands; the calcium sulfate whiskers are available from Jinan Qingyuyuan New Materials Co., Ltd.; and the titanate coupling agent is available as NDZ-201.

[0034] Preparation Example

[0035] Preparation Example 1

[0036] Preparation Example 1 provides a method for preparing a silane-modified molybdenum disulfide graphene filler, comprising the following steps:

[0037] First, γ-aminopropyltriethoxysilane, ethanol, and water are stirred evenly to obtain a modified solution; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol, and water is 5:18:2;

[0038] Molybdenum disulfide and nano-graphene are added to a high-speed mixer and mixed to obtain a mixture. During the stirring process, a modifying liquid is slowly sprayed into the mixture, and the mixture is stirred for 0.5 hours after spraying. Then, the mixture is dried at a temperature of 100°C for 2 hours to obtain a silane-modified molybdenum disulfide graphene filler; wherein the weight ratio of molybdenum disulfide to nano-graphene is 1.5:1; and the weight ratio of the mixture to the modifying liquid is 13.5:1.

[0039] Example

[0040] Example 1

[0041] Example 1 provides a method for manufacturing a polytetrafluoroethylene suspension resin modified and filled foam board, comprising the following steps:

[0042] Raw material mixing: 100 kg of polytetrafluoroethylene suspension resin fine powder, 8 kg of nano-silica, and 5 kg of camphor powder were stirred at a speed of 100 r / min for 60 min to obtain a mixture; wherein the fineness of the polytetrafluoroethylene suspension resin fine powder was 235 μm; the mesh size of the camphor powder was 100;

[0043] Pre-pressing: First apply 150kg / cm 2 The pre-pressure was applied to obtain a preform A with an outer diameter of 457 mm, an inner diameter of 150 mm, and a length of 1550 mm; the preform A was then placed for 24 hours to obtain a preform B;

[0044] High temperature treatment: preform B is placed in an oven and slowly heated to 24°C over 10 hours, then maintained at a constant temperature with exhaust for 80 hours; then slowly heated to 320°C over 15 hours, and maintained at 320°C for 15 hours; then heated to 375°C over 5 hours, and maintained at 375°C for 20 hours to obtain preform C; then slowly cooled to 320°C over 5 hours, and maintained at 320°C for 15 hours; then slowly cooled to 250°C over 5 hours, and maintained at 250°C for 8 hours; finally, slowly cooled to 100°C over 10 hours, maintained at 100°C for 8 hours, and then slowly cooled to room temperature to obtain preform D;

[0045] Rotary cutting: preform D was heated to 80°C and allowed to stand at a constant temperature for 24 hours, and then sliced ​​to obtain a foamed board with a thickness of 3 mm.

[0046] Example 2

[0047] The difference between Example 2 and Example 1 is that the raw materials are mixed: 100 kg of tetrafluoroethylene suspension resin fine powder, 10 kg of nano-silica, and 5.5 kg of camphor powder are stirred at a speed of 200 r / min for 45 min to obtain a mixture; wherein the fineness of the tetrafluoroethylene suspension resin fine powder is 235 microns; the mesh size of the camphor powder is 100; and the remaining steps are consistent with Example 1.

[0048] Example 3

[0049] The difference between Example 3 and Example 1 is that the raw materials are mixed: 100 kg of tetrafluoroethylene suspension resin fine powder, 12 kg of nano-silica, and 6 kg of camphor powder are stirred at a speed of 300 r / min for 30 min to obtain a mixture; wherein the fineness of the tetrafluoroethylene suspension resin fine powder is 235 microns; the mesh size of the camphor powder is 100; and the remaining steps are consistent with Example 1.

[0050] Example 4

[0051] The difference between Example 4 and Example 2 is that, in pre-pressing, the mixture is first subjected to a pressure of 180 kg / cm 2 The pre-pressure was applied to obtain a preform A with an outer diameter of 457 mm, an inner diameter of 150 mm, and a length of 1550 mm; the preform A was then placed for 24 hours to obtain a preform B;

[0052] High temperature treatment: preform B is placed in an oven and slowly heated to 100°C over 10 hours, then maintained at a constant temperature with exhaust for 45 hours; then slowly heated to 320°C over 15 hours, and maintained at 320°C for 15 hours; then heated to 375°C over 5 hours, and maintained at 375°C for 20 hours to obtain preform C; then slowly cooled to 320°C over 5 hours, and maintained at 320°C for 15 hours; then slowly cooled to 250°C over 5 hours, and maintained at 250°C for 8 hours; finally, slowly cooled to 100°C over 10 hours, maintained at 100°C for 8 hours, and then slowly cooled to room temperature to obtain preform D;

[0053] Rotary cutting: preform D was heated to 90° C. and allowed to stand at a constant temperature for 24 h, and then sliced ​​to obtain a foamed board with a thickness of 3 mm. The remaining steps were consistent with those in Example 1.

[0054] Example 5

[0055] The difference between Example 5 and Example 2 is that, in pre-pressing, the mixture is first subjected to a pressure of 200 kg / cm 2 The pre-pressure was applied to obtain a preform A with an outer diameter of 457 mm, an inner diameter of 150 mm, and a length of 1550 mm; the preform A was then placed for 24 hours to obtain a preform B;

[0056] High temperature treatment: preform B is placed in an oven and slowly heated to 150°C over 10 hours, then maintained at a constant temperature with exhaust for 10 hours; then slowly heated to 320°C over 15 hours, and maintained at 320°C for 15 hours; then heated to 375°C over 5 hours, and maintained at 375°C for 20 hours to obtain preform C; then slowly cooled to 320°C over 5 hours, and maintained at 320°C for 15 hours; then slowly cooled to 250°C over 5 hours, and maintained at 250°C for 8 hours; finally, slowly cooled to 100°C over 10 hours, maintained at 100°C for 8 hours, and then slowly cooled to room temperature to obtain preform D;

[0057] Rotary cutting: preform D was heated to 100° C. and allowed to stand at a constant temperature for 24 h, and then sliced ​​to obtain a foamed board with a thickness of 3 mm. The remaining steps were consistent with those in Example 1.

[0058] Example 6

[0059] The difference between Example 6 and Example 4 is that the raw materials are mixed: 100 kg of tetrafluoroethylene suspension resin fine powder, 10 kg of nano-silica, 5.5 kg of camphor powder, 3 kg of carbon fiber, 2 kg of calcium sulfate whiskers, 2.5 kg of silane-modified molybdenum disulfide graphene filler in Preparation Example 1, 0.3 kg of titanate coupling agent, and 3 kg of polytetrafluoroethylene powder are stirred at a speed of 200 r / min for 45 minutes to obtain a mixture; wherein the fineness of the tetrafluoroethylene suspension resin fine powder is 235 microns;

[0060] Pre-pressing: First apply 235kg / cm 2 The pre-pressure was applied to obtain a preform A having an outer diameter of 457 mm, an inner diameter of 150 mm, and a length of 1550 mm; the preform A was then placed for 24 hours to obtain a preform B; the remaining steps were consistent with those of Example 1.

[0061] Comparative Example

[0062] Comparative Example 1

[0063] Comparative Example 1 provides a method for manufacturing a plate, comprising the following steps:

[0064] Add nano-silica to an anhydrous ethanol solution containing 3% KH550, stir at a temperature of 50°C and a rotation speed of 200 r / min for 2 hours, then filter and dry to obtain treated nano-silica; wherein the particle size of the nano-silica is 50nm and the specific surface area is 200m 2 / g;

[0065] The treated nano-silica and polytetrafluoroethylene resin powder are added to a high-speed mixer in a mass ratio of 5:100, and pre-mixed at a temperature of 40°C and a rotation speed of 300 r / min for 10 minutes; an extrusion aid is added in a mass ratio of the extrusion aid to the polytetrafluoroethylene resin powder of 3:100, and mixing is continued at a temperature of 45°C and a rotation speed of 350 r / min for 15 minutes to obtain a mixture; wherein the polytetrafluoroethylene resin powder has an average particle size of 60 μm and a molecular weight distribution between 600,000 and 1,100,000; and the extrusion aid is paraffin wax with a melting point of 50-55°C.

[0066] The mixed material was placed in a mold, and a pressure of 10 MPa was applied at room temperature and maintained for 10 minutes to obtain a green body. The green body was placed in a sintering furnace, heated to 380°C at a rate of 5°C / min, maintained for 30 minutes, and then cooled to room temperature at a rate of 3°C / min. The sintered plate was cut and polished to obtain a plate with a size of 1000 mm × 1000 mm × 5 mm.

[0067] Performance Testing Basic Performance: According to the standard of GB / T9129-2003, the density, compression rate, rebound rate and gas leakage rate of the foamed board in each embodiment and comparative example were tested.

[0068] Deformation resistance: According to GB / T20671.5-2020 standard A method, the experimental time is 22 hours to obtain the creep relaxation rate. The lower the creep relaxation rate, the stronger the deformation resistance of the foam board.

[0069] Table 1 Performance test results of foam board

[0070]

[0071] In combination with Examples 1-3 and Comparative Example 1, the deformation resistance of the foamed boards in Examples 1-3 is better. It can be seen that by using the preparation method in the present application, silicon dioxide is first added to the raw materials when mixing the raw materials, which can improve the mechanical properties of the board. The camphor powder will volatilize during the subsequent high-temperature treatment process, and the gaps left during the volatilization process will form a foaming structure, thereby achieving lightweighting of the board and also making the board have higher deformation resistance. Subsequently, pre-pressing, high-temperature treatment, and rotary cutting are carried out to obtain a foamed board with strong deformation resistance.

[0072] Combining Example 2, Example 4 and Example 5, it can be seen that when preparing the foamed board, according to the preparation conditions in Example 2, Example 4 and Example 5, the foamed board has better performance.

[0073] In conjunction with Example 4 and Example 6, the deformation resistance of the foamed plate in Example 6 is better. It can be seen that when the raw materials are mixed, carbon fiber, calcium sulfate whisker, the silane-modified molybdenum disulfide graphene filler in Preparation Example 1, titanate coupling agent, and polytetrafluoroethylene powder are further added to the raw materials. Carbon fiber and calcium sulfate whisker form a rigid-flexible composite reinforcement system, carbon fiber provides macroscopic skeleton support, whiskers fill microscopic voids, and silicon dioxide forms a dense transition layer at the interface. The silane on the surface of the silane-modified molybdenum disulfide graphene filler and the titanate coupling agent can reduce the interfacial energy difference. The layered structure of molybdenum disulfide and the two-dimensional characteristics of graphene form a sliding-bearing composite system, which dissipates energy by lamellar slip during creep, while the high modulus characteristics of graphene suppress matrix plastic deformation. Polytetrafluoroethylene powder and camphor powder form a gradient volatilization system, which produces an ordered pore structure during high-temperature treatment, cooperates with the constraint effect of carbon fiber to form a three-dimensional stress buffer network, thereby further improving the deformation resistance of the foamed plate.

[0074] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for producing a polytetrafluoroethylene suspension resin modified and filled foam board, characterized in that: The following steps are involved: Raw material mixing: tetrafluoroethylene suspension resin fine powder, silicon dioxide, camphor powder, carbon fiber, calcium sulfate whisker, silane-modified molybdenum disulfide graphene filler, titanate coupling agent, and polytetrafluoroethylene powder are stirred and mixed uniformly to obtain a mixture; Pre-pressing: First, apply pressure to the mixture to obtain preform A; then place preform A to obtain preform B; High temperature treatment: preform B is foamed and plasticized under heating conditions to obtain preform C; then preform C is cooled to obtain preform D; Rotary cutting: The preform D is heated and allowed to stand at a constant temperature, and then sliced ​​to obtain a foamed board.

2. The method for producing a polytetrafluoroethylene suspension resin modified and filled foam board according to claim 1, characterized in that: The fineness of the tetrafluoroethylene suspension resin powder is 200-250 microns.

3. The method for producing a polytetrafluoroethylene suspension resin modified and filled foam board according to claim 1, characterized in that: In the raw material mixing step, the mass fraction of the silicon dioxide in the tetrafluoroethylene suspension resin fine powder is 8-12%; the mass fraction of the camphor powder in the tetrafluoroethylene suspension resin fine powder is 5-6%.

4. The method for producing a polytetrafluoroethylene suspension resin modified and filled foam board according to claim 3, characterized in that: In the raw material mixing step, the stirring speed is 100-300 r / min and the time is 30-60 min.

5. The method for producing a polytetrafluoroethylene suspension resin modified and filled foam board according to claim 1, characterized in that: The pre-pressing step is: first, apply 150-200kg / cm 2 The pre-pressure is applied to obtain pre-product A; then the pre-product A is placed for 24 hours to obtain pre-product B.

6. The method for producing a polytetrafluoroethylene suspension resin modified and filled foam board according to claim 5, characterized in that: The high-temperature treatment steps are as follows: adding preform B to an oven, slowly heating the temperature to 24-150° C. over 10 hours, then maintaining the temperature and exhausting for 10-80 hours; then slowly heating the temperature to 320° C. over 15 hours, maintaining the temperature at 320° C. for 15 hours; then gradually heating the temperature to 375° C. over 5 hours, maintaining the temperature at 375° C. for 20 hours, to obtain preform C; slowly cooling the preform C to 320° C. over 5 hours, maintaining the temperature at 320° C. for 15 hours; then slowly cooling the preform C to 250° C. over 5 hours, maintaining the temperature at 250° C. for 8 hours; finally, slowly cooling the temperature to 100° C. over 10 hours, maintaining the temperature at 100° C. for 8 hours, and then slowly cooling the temperature to room temperature, to obtain preform D.

7. The method for producing a polytetrafluoroethylene suspension resin modified and filled foam board according to claim 6, characterized in that: The rotary cutting process is as follows: heating the preform D to 80-100° C. and keeping it at a constant temperature for 24 hours, and then slicing it to obtain a foamed board.

8. The method for producing a polytetrafluoroethylene suspension resin modified and filled foam board according to claim 1, characterized in that: The pre-pressing step is: first, apply 220-250kg / cm 2 The pre-pressure is applied to obtain pre-product A; then the pre-product A is placed for 24 hours to obtain pre-product B.

9. The method for producing a polytetrafluoroethylene suspension resin modified and filled foam board according to claim 1, characterized in that: The preparation method of the silane-modified molybdenum disulfide graphene filler comprises the following steps: First, γ-aminopropyltriethoxysilane, ethanol, and water are stirred evenly to obtain a modified solution; Molybdenum disulfide and nanographene are added into a high-speed mixer and mixed to obtain a mixture. During the stirring process, a modifying liquid is slowly sprayed into the mixture. After spraying, the mixture is continuously stirred and dried to obtain a silane-modified molybdenum disulfide graphene filler.

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