High-temperature-resistant and wear-resistant plastic plate and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant and wear-resistant plastic plate and a preparation method thereof, and belongs to the technical field of plastic plate preparation. Comprising the following raw materials in parts by weight: 45-60 parts of thermoplastic polyimide resin; 10 to 20 parts of polyether-ether-ketone; 8-15 parts of a modified inorganic filler; 10 to 25 parts of modified carbon fiber; 1-3 parts of a lubricant; the prepared plastic plate has excellent high temperature resistance and wear resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plastic plate preparation and relates to a high-temperature-resistant and wear-resistant plastic plate and a preparation method thereof. BACKGROUND

[0002] In the fields of aerospace, precision machinery, automobile engine parts, high-temperature bearings and sliding blocks, extremely harsh requirements are put forward for the high-temperature resistance, wear resistance and mechanical strength of structural materials. Traditional metal materials have large density, are prone to corrosion and need an additional lubrication system under certain working conditions. Common engineering plastics, such as polyformaldehyde and nylon, have a long-term use temperature generally lower than 120-150 DEG C, and the wear resistance and mechanical strength thereof decrease sharply at high temperatures, which cannot meet the working condition requirements of high temperature, high load and oil-free lubrication.

[0003] Polyimide and polyether ether ketone are two types of high-temperature-resistant engineering plastics with the best performance. Among them, polyimide, especially thermoplastic polyimide, has the highest thermal stability, excellent mechanical properties and flame retardancy, but has a narrow processing window, high melt viscosity and large intrinsic brittleness, and the wear resistance and impact resistance of pure PI material need to be improved.

[0004] Therefore, there is an urgent need in the art to develop a new type of polymer composite material which can comprehensively improve the super-high temperature resistance of PI and the excellent processability and toughness of PEEK, and simultaneously improve the wear resistance, so as to meet the application requirements under high-temperature working conditions. SUMMARY

[0005] The application aims to provide a high-temperature-resistant and wear-resistant plastic plate and a preparation method thereof, and the prepared plastic plate has excellent high-temperature resistance and wear resistance.

[0006] The application can be realized by the following technical scheme. A high-temperature-resistant and wear-resistant plastic plate comprises the following raw materials in parts by weight: thermoplastic polyimide resin 45-60 parts; polyether ether ketone 10-20 parts; modified inorganic filler 8-15 parts; modified carbon fiber 10-25 parts; lubricant 1-3 parts; The preparation process of the modified carbon fiber is as follows: S11, pretreated carbon fiber is obtained by treating carbon fiber by plasma; S12, 60~80 parts by weight of deionized water, 5~10 parts of pretreated carbon fiber and 3~5 parts of cationic polyacrylamide are stirred uniformly to obtain a mixed slurry, the pH value of the mixed slurry is adjusted to 8~9 at 80~90℃, 5~10 parts of cerium sulfate is added, stirring at 350rpm for 1~2h, the pH value of the mixed slurry is adjusted to 9~10 by adding alkali, and the stirring speed is kept at 80~90℃ for 1~3h, and then the solid is obtained by filtration, washing and drying; S13, the solid is calcined at 450~620℃ for 3~5h to prepare the modified carbon fiber.

[0007] As a preferred technical solution of the present application, the preparation process of the modified inorganic filler is as follows: 5~8 parts of aluminum sulfate is added in 100~150 parts of water and stirred to dissolve, 2~4 parts of hafnium carbide pretreated by silane coupling agent KH-550 is added, stirring at 600r / min for 0.5~1h, the pH value of the solution is adjusted to 8~9 by adding potassium hydroxide, stirring at 500r / min for 3h, and then the solid is obtained by filtration, washing with deionized water and anhydrous ethanol, vacuum drying at 80℃, and calcining the dried solid at 450~510℃ for 3~4.5h in argon or nitrogen atmosphere to prepare the modified inorganic filler.

[0008] As a preferred technical solution of the present application, the lubricant is polytetrafluoroethylene micro powder and graphite with a mass ratio of (2~3):1.

[0009] As a preferred technical solution of the present application, oxygen and argon are used as mixed gas for plasma treatment, and the surface of the carbon fiber is bombarded, the proportion of oxygen in the mixed gas is 10~20%, and the power of the bombardment is 50~100W.

[0010] As a preferred technical solution of the present application, the length of the carbon fiber is 50~200μm.

[0011] As a preferred technical solution of the present application, the preparation process of the pretreated hafnium carbide is as follows: the hafnium carbide is dispersed in anhydrous ethanol and water with a volume ratio of 10:1, 3~5% of silane coupling agent KH-550 based on the mass of hafnium carbide is added, stirring at 500rpm for 2~4h at 70~80℃, and then the pretreated hafnium carbide is obtained by filtration, washing and drying.

[0012] A preparation method of a high-temperature-resistant and wear-resistant plastic plate, comprising the following preparation process: S1, premixing: According to the weight proportions, thermoplastic polyimide resin, polyether ether ketone, modified inorganic filler, modified carbon fiber and lubricant are added to a high-speed mixer and mixed at a speed of 600~800 rpm for 50~70 min to obtain a premixed material. S2, Granulation: The premixed materials are melt-blended and granulated using a twin-screw extruder to obtain composite masterbatch; S3, Molding: The composite masterbatch is placed in a preheated mold and hot-pressed. After cooling, it is heat-treated by a programmed temperature increase. After cooling to room temperature, it is demolded to obtain the plastic sheet.

[0013] As a preferred technical solution of the present invention, in step S2, the specific processing temperature of the twin-screw extruder is set as follows: zone 1 320℃, zone 2 350℃, zone 3 370~375℃, zone 4 375~380℃, zone 5 370℃, and die head 360℃, and the screw speed is 200~300 rpm.

[0014] As a preferred technical solution of the present invention, in step S3, the temperature during hot pressing is 355~365℃, the pressure is 10~15 MPa, and the holding time is 20~40min.

[0015] As a preferred technical solution of the present invention, in step S3, the programmed temperature rise heat treatment is as follows: first, the temperature is raised to 180~200℃ at 2~4℃ / min and held for 60~90min, then the temperature is raised to 240~260℃ at 2℃ / min and held for 45~60min.

[0016] In this invention, thermoplastic polyimide resin and polyetheretherketone are used as the matrix of the composite material. Thermoplastic polyimide resin is used as the main matrix material, and its high proportion ensures the material's ultimate heat resistance and mechanical strength. Polyetheretherketone is used as a secondary auxiliary matrix, and its appropriate proportion is used to improve the material's processing fluidity and effectively toughen it, while avoiding affecting the material's overall heat resistance.

[0017] In the formulation, polytetrafluoroethylene (PTFE) micro powder and graphite are compounded at a mass ratio of (2~3):1 as a lubricant. PTFE is the main component, which can provide a lower initial coefficient of friction. Graphite, which plays an auxiliary role, forms a stable lubricating film under high temperature and continuous friction, thus improving the disadvantage of high high-temperature wear rate of PTFE. The two work together to reduce wear.

[0018] Compared to directly physically mixing cerium oxide powder and carbon fiber, there is no chemical bond between cerium oxide and carbon fiber; it is only physically adsorbed. This makes it easy for the cerium oxide to detach during processing, resulting in uneven dispersion and poor interfacial bonding.

[0019] In this invention, low-power oxygen-mixed plasma is used to bombard the surface of carbon fiber. This treatment can effectively remove organic pollutants and weak boundary layers that adsorbed on the carbon fiber during production and subsequent processing. The oxygen plasma will etch tiny pits on the surface of the carbon fiber and introduce a large number of oxygen-containing functional groups, and can increase the specific surface area and surface roughness of the carbon fiber.

[0020] In step S12, the pretreated carbon fibers are mixed with the dispersant cationic polyacrylamide. Due to the treatment in step S11, the oxygen-containing functional groups on the carbon fiber surface undergo deprotonation in the alkaline aqueous phase. Cationic polyacrylamide is a long-chain polymer, and its cationic segments can be adsorbed onto the negatively charged carbon fiber surface through electrostatic attraction. Therefore, the long molecular chains can act as steric stabilizers in water, preventing carbon fiber agglomeration and forming a uniform slurry. This ensures that subsequent processing does not result in self-agglomeration into particles or uneven deposition.

[0021] Then, cerium sulfate (Ce) is added under weakly alkaline conditions. 3+ Ions are complexed or adsorbed by the functional groups on the cationic polyacrylamide molecular chain and can be uniformly distributed on the carbon fiber surface. They are uniformly deposited under alkaline conditions and finally calcined at high temperature in step S13 to remove organic components. The carbon fiber surface is uniformly coated with CeO2, which can effectively prevent oxygen from diffusing into the carbon fiber body at high temperature, thereby inhibiting the oxidation of carbon fiber during high-temperature processing and use, extending the material life. Furthermore, the CeO2-carbon fiber composite reinforcement works synergistically with the high-temperature resistant polymer matrix, enabling the entire composite material to maintain its performance in more demanding high-temperature environments.

[0022] This invention uses hafnium carbide and alumina as inorganic fillers. The physical mixture of alumina and hafnium carbide particles has weak bonding force. When subjected to external force or thermal stress, the interface is prone to become a crack source, leading to material failure. Furthermore, nanoscale hafnium carbide powder is prone to agglomeration, resulting in a reduction in material performance.

[0023] Therefore, this invention first pretreats hafnium carbide with a silane coupling agent to prevent its agglomeration and improve its compatibility. Simultaneously, through hydrothermal reaction and calcination, the resulting alumina grows uniformly on and coats the surface of hafnium carbide, or becomes tightly interwoven with it. This process is completed in the liquid phase, achieving uniform molecular-level mixing and strong bonding of the two phases at the nanoscale, which is unattainable through physical mixing. This allows the composite material to effectively transfer loads under stress, rather than peeling off at the interface.

[0024] Therefore, the prepared modified inorganic filler can leverage the synergistic reinforcing effect of alumina and hafnium carbide to improve overall hardness and thus significantly enhance wear resistance. Furthermore, the modified inorganic filler itself is extremely stable, exhibiting no decomposition or oxidation at high temperatures, providing a stable framework for the plastic matrix and delaying the thermal decomposition and oxidation processes of the matrix.

[0025] The beneficial effects of this invention are: This invention provides a plastic sheet using thermoplastic polyimide resin and polyetheretherketone as the matrix, which effectively improves the processability of the material while ensuring high temperature resistance. At the same time, hafnium carbide-modified alumina is added as an inorganic filler to significantly improve wear resistance and thermal stability. Modified carbon fiber is used to help form a strong reinforcing network, which improves the hardness and wear resistance of the material. PTFE and graphite are used as lubricants. The plastic sheet with excellent wear resistance and high temperature resistance is obtained by melt blending granulation and hot pressing. Detailed Implementation

[0026] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0027] It should be noted that in the following examples and comparative examples, the thermoplastic polyimide resin was purchased from Shanghai Teflon New Material Technology Co., Ltd., item number: PI P84 NT2; and the polyetheretherketone was purchased from Hubei Yongkuo Technology Co., Ltd., item number: YK2115.

[0028] Unless otherwise specified, the present invention does not specifically limit the source of the raw materials used. Commercially available products or products prepared by conventional preparation methods that are well known to those skilled in the art are acceptable. Experimental methods without specific conditions are all conventional methods and conditions well known in the art.

[0029] Example 1

[0030] Preparation of modified carbon fibers: S11. Carbon fiber is pretreated by plasma treatment. During plasma treatment, oxygen and argon are used as a mixed gas to bombard the surface of the carbon fiber. The oxygen content in the mixed gas is 15%, and the bombardment power is 70W. S12. By weight, 70 parts of deionized water, 8 parts of pretreated carbon fiber, and 4 parts of cationic polyacrylamide are stirred evenly to obtain a mixed slurry. The pH of the mixed slurry is adjusted to 8-9 at 85°C. 8 parts of cerium sulfate are added and stirred at 350 rpm for 1.5 hours. Alkali is added to adjust the pH of the mixed slurry to 9-10. The mixture is then hydrothermally stirred at 85°C for 2 hours. After filtration, washing, and drying, a solid is obtained. S13. The solid was calcined at 520°C for 4 hours to prepare the modified carbon fiber.

[0031] Preparation of modified inorganic fillers: Hafnium carbide was dispersed in anhydrous ethanol and water at a volume ratio of 10:1, and 4% by mass of silane coupling agent KH-550 was added. The mixture was stirred at 500 rpm for 3 hours at 75°C. After stirring, the mixture was filtered, washed and dried to obtain pretreated hafnium carbide. By weight, 7 parts of aluminum sulfate were added to 120 parts of water and stirred thoroughly to dissolve. Then, 3 parts of pretreated hafnium carbide were added and stirred at 600 r / min for 0.8 h. Potassium hydroxide was added to adjust the pH of the solution to 8-9, and the mixture was stirred at 500 r / min for 3 h. After stirring, the solution was kept at 140 °C for 10 h. After the stirring, the solution was filtered, washed with deionized water and anhydrous ethanol, and dried under vacuum at 80 °C. The dried solid was then calcined at 480 °C for 3.5 h under an argon or nitrogen protective atmosphere to prepare the modified inorganic filler.

[0032] S1, Premixed: According to the weight ratio, 55 parts of thermoplastic polyimide resin, 15 parts of polyether ether ketone, 11 parts of modified inorganic filler, 15 parts of modified carbon fiber, and 2 parts of polytetrafluoroethylene micro powder and graphite in a mass ratio of 2.5:1 were added to a high-speed mixer and mixed at 700 rpm for 60 minutes to obtain a premixed material. S2, Granulation: The premixed material is melt-blended and granulated using a twin-screw extruder. The specific processing temperature of the twin-screw extruder is set as follows: Zone 1 320℃, Zone 2 350℃, Zone 3 372℃, Zone 4 378℃, Zone 5 370℃, and Die Head 360℃. The screw speed is 250 rpm, resulting in composite masterbatch. S3, Molding: The composite masterbatch is placed in a preheated mold and hot-pressed. The hot-pressing temperature is 360℃, the pressure is 12 MPa, and the holding time is 30 min. After cooling, it is heat-treated by programmed temperature rise. First, the temperature is raised to 190℃ at 3℃ / min and held for 70 min, then raised to 250℃ at 2℃ / min and held for 50 min. After cooling to room temperature in the furnace, it is demolded to obtain the plastic sheet.

[0033] Example 2

[0034] Preparation of modified carbon fibers: S11. Carbon fiber is pretreated by plasma treatment. During plasma treatment, oxygen and argon are used as a mixed gas to bombard the surface of the carbon fiber. The oxygen content in the mixed gas is 10%, and the bombardment power is 50W. S12. By weight, 60 parts of deionized water, 5 parts of pretreated carbon fiber, and 3 parts of cationic polyacrylamide are mixed evenly to obtain a mixed slurry. The pH of the mixed slurry is adjusted to 8-9 at 80°C. 5 parts of cerium sulfate are added and stirred at 350 rpm for 1 hour. Alkali is added to adjust the pH of the mixed slurry to 9-10. The mixture is then hydrothermally stirred at 80°C for 1 hour. After filtration, washing, and drying, a solid is obtained. S13. The solid is calcined at 450°C for 3 hours to prepare the modified carbon fiber.

[0035] Preparation of modified inorganic fillers: Hafnium carbide was dispersed in anhydrous ethanol and water at a volume ratio of 10:1, and 3% of silane coupling agent KH-550 was added. The mixture was stirred at 500 rpm for 2 hours at 70°C. After stirring, the mixture was filtered, washed and dried to obtain pretreated hafnium carbide. By weight, 5 parts of aluminum sulfate were added to 100 parts of water and stirred thoroughly to dissolve. 2 parts of pretreated hafnium carbide were added and stirred at 600 r / min for 0.5 h. Potassium hydroxide was added to adjust the pH of the solution to 8-9, and the mixture was stirred at 500 r / min for 3 h. After stirring, the solution was kept at 130℃ for 9 h. After the reaction, the solution was filtered, washed with deionized water and anhydrous ethanol, and vacuum dried at 80℃. The dried solid was then calcined at 450℃ for 3 h under an argon or nitrogen protective atmosphere to prepare the modified inorganic filler.

[0036] S1, Premixed: According to the weight ratio, 45 parts of thermoplastic polyimide resin, 10 parts of polyether ether ketone, 8 parts of modified inorganic filler, 10 parts of modified carbon fiber, and 1 part of polytetrafluoroethylene micro powder and graphite in a mass ratio of 2:1 were added to a high-speed mixer and mixed at 600 rpm for 50 minutes to obtain a premixed material. S2, Granulation: The premixed material is melt-blended and granulated using a twin-screw extruder. The specific processing temperature of the twin-screw extruder is set as follows: Zone 1 320℃, Zone 2 350℃, Zone 3 370℃, Zone 4 375℃, Zone 5 370℃, and Die Head 360℃. The screw speed is 200 rpm, resulting in composite masterbatch. S3, Molding: The composite masterbatch is placed in a preheated mold and hot-pressed. The hot-pressing temperature is 355℃, the pressure is 10MPa, and the holding time is 20min. After cooling, it is heat-treated by programmed temperature rise. First, the temperature is raised to 180℃ at 2℃ / min and held for 60min. Then, the temperature is raised to 240℃ at 2℃ / min and held for 45min. After cooling to room temperature in the furnace, it is demolded to obtain the plastic sheet.

[0037] Example 3

[0038] Preparation of modified carbon fibers: S11. Carbon fiber is pretreated by plasma treatment. During plasma treatment, oxygen and argon are used as a mixed gas to bombard the surface of the carbon fiber. The oxygen content in the mixed gas is 20%, and the bombardment power is 100W. S12. By weight, 80 parts of deionized water, 10 parts of pretreated carbon fiber, and 5 parts of cationic polyacrylamide are stirred evenly to obtain a mixed slurry. The pH of the mixed slurry is adjusted to 8-9 at 90°C. 10 parts of cerium sulfate are added and stirred at 350 rpm for 2 hours. Alkali is added to adjust the pH of the mixed slurry to 9-10. The mixture is then hydrothermally stirred at 90°C for 3 hours. After filtration, washing, and drying, a solid is obtained. S13. The solid was calcined at 620°C for 5 hours to prepare the modified carbon fiber.

[0039] Preparation of modified inorganic fillers: Hafnium carbide was dispersed in anhydrous ethanol and water at a volume ratio of 10:1, and 5% of silane coupling agent KH-550 was added. The mixture was stirred at 500 rpm for 4 hours at 80°C. After stirring, the mixture was filtered, washed and dried to obtain pretreated hafnium carbide. By weight, 8 parts of aluminum sulfate were added to 150 parts of water and stirred thoroughly to dissolve. Then, 4 parts of pretreated hafnium carbide were added and stirred at 600 r / min for 1 h. Potassium hydroxide was added to adjust the pH of the solution to 8-9, and the mixture was stirred at 500 r / min for 3 h. After stirring, the solution was kept at 150 °C for 11 h. After the stirring, the solution was filtered, washed with deionized water and anhydrous ethanol, and dried under vacuum at 80 °C. The dried solid was then calcined at 510 °C for 4.5 h under an argon or nitrogen protective atmosphere to prepare the modified inorganic filler.

[0040] S1, Premixed: According to the weight ratio, 60 parts of thermoplastic polyimide resin, 20 parts of polyether ether ketone, 15 parts of modified inorganic filler, 25 parts of modified carbon fiber, and 3 parts of polytetrafluoroethylene micro powder and graphite in a mass ratio of 3:1 were added to a high-speed mixer and mixed at 800 rpm for 70 minutes to obtain a premixed material. S2, Granulation: The premixed material is melt-blended and granulated using a twin-screw extruder. The specific processing temperature of the twin-screw extruder is set as follows: Zone 1 320℃, Zone 2 350℃, Zone 3 375℃, Zone 4 380℃, Zone 5 370℃, and Die Head 360℃. The screw speed is 300 rpm, resulting in composite masterbatch. S3, Molding: The composite masterbatch is placed in a preheated mold and hot-pressed. The hot-pressing temperature is 365℃, the pressure is 15 MPa, and the holding time is 40 min. After cooling, it is heat-treated by programmed temperature rise. First, the temperature is raised to 200℃ at 4℃ / min and held for 90 min, then raised to 260℃ at 2℃ / min and held for 60 min. After cooling to room temperature in the furnace, it is demolded to obtain the plastic sheet.

[0041] Comparative Example 1

[0042] This comparative example is basically the same as Example 1, except that unmodified alumina is used as an inorganic filler in this comparative example.

[0043] Comparative Example 2

[0044] This comparative example is basically the same as Example 1, except that step S11 was not performed in this comparative example.

[0045] Comparative Example 3

[0046] This comparative example is basically the same as Example 1, except that cationic polyacrylamide was not used in step S12 of this comparative example.

[0047] Comparative Example 4

[0048] This comparative example is basically the same as Example 1, except that steps S12 and S13 are not performed in step S12 of this comparative example.

[0049] Comparative Example 5

[0050] This comparative example is basically the same as Example 1, except that it uses untreated carbon fiber.

[0051] Comparative Example 6

[0052] This comparative example is basically the same as Example 1, except that it uses untreated carbon fiber and untreated alumina.

[0053] Performance testing: 1. High-temperature dimensional stability: The conditions were as follows: the plastic sheets prepared in the examples and comparative examples were cut into sample sizes with a length of (100.0±0.1) mm, a width of (10.0±0.2) mm, and a thickness equal to the original thickness of the sheet. They were placed in a standard environment with a temperature of 23±2℃ and a relative humidity of 50±10% for 48 hours; then placed at 200℃ for 24 hours. After cooling, the dimensions of the samples were measured again within 1 hour, and the dimensional change rate was calculated. 2. Abrasion resistance: The volumetric abrasion of the plastic sheets prepared in the examples and comparative examples was tested according to standard GB / T 9867-2008; 3. Heat distortion temperature: GB / T 1634.2, the test results are shown in Table 1 below: Table 1

[0054] Based on the above data, it can be seen that the plastic sheet prepared by the present invention has excellent high temperature resistance and wear resistance.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-temperature resistant and wear-resistant plastic sheet, characterized in that, The ingredients include the following parts by weight: 45-60 parts of thermoplastic polyimide resin; 10-20 parts of polyetheretherketone; 8-15 parts of modified inorganic filler; 10-25 parts of modified carbon fiber; 1-3 parts lubricant; The preparation process of the modified carbon fiber is as follows: S11. Pretreated carbon fibers are obtained by plasma treatment. S12. By weight, 60-80 parts of deionized water, 5-10 parts of pretreated carbon fiber, and 3-5 parts of cationic polyacrylamide are stirred evenly to obtain a mixed slurry. The pH of the mixed slurry is adjusted to 8-9 at 80-90℃. 5-10 parts of cerium sulfate are added and stirred at 350 rpm for 1-2 hours. Alkali is added to adjust the pH of the mixed slurry to 9-10. The mixture is then hydrothermally stirred at 80-90℃ for 1-3 hours. After filtration, washing, and drying, a solid is obtained. S13. The solid is calcined at 450~620℃ for 3~5h to prepare the modified carbon fiber.

2. The high-temperature resistant and wear-resistant plastic sheet according to claim 1, characterized in that, The preparation process of the modified inorganic filler is as follows: By weight, 5-8 parts of aluminum sulfate were added to 100-150 parts of water and stirred thoroughly to dissolve. Then, 2-4 parts of hafnium carbide pretreated with silane coupling agent KH-550 were added and stirred at 600 r / min for 0.5-1 h. Potassium hydroxide was added to adjust the pH of the solution to 8-9, and the mixture was stirred at 500 r / min for 3 h. The mixture was then kept at 130-150℃ for 9-11 h. After the mixture was removed, it was filtered, washed with deionized water and anhydrous ethanol, and vacuum dried at 80℃. The dried solid was then calcined at 450-510℃ for 3-4.5 h under an argon or nitrogen protective atmosphere to prepare the modified inorganic filler.

3. The high-temperature resistant and wear-resistant plastic sheet according to claim 1, characterized in that, The lubricant is polytetrafluoroethylene micro powder and graphite in a mass ratio of (2~3):

1.

4. The high-temperature resistant and wear-resistant plastic sheet according to claim 1, characterized in that, The plasma treatment uses a mixture of oxygen and argon to bombard the surface of the carbon fiber. The oxygen content in the mixture is 10-20%, and the bombardment power is 50-100W.

5. The high-temperature resistant and wear-resistant plastic sheet according to claim 1, characterized in that, The carbon fiber has a length of 50~200μm.

6. The high-temperature resistant and wear-resistant plastic sheet according to claim 2, characterized in that, The preparation process of the pretreated hafnium carbide: Hafnium carbide was dispersed in anhydrous ethanol and water at a volume ratio of 10:1, and 3-5% of silane coupling agent KH-550 was added. The mixture was stirred at 500 rpm for 2-4 hours at 70-80°C. After stirring, the mixture was filtered, washed, and dried to obtain pretreated hafnium carbide.

7. A method for preparing a high-temperature resistant and wear-resistant plastic sheet according to any one of claims 1-6, characterized in that, The preparation process includes the following: S1. Premixing: According to the weight parts, thermoplastic polyimide resin, polyether ether ketone, modified inorganic filler, modified carbon fiber and lubricant are added to a high-speed mixer and mixed at a speed of 600~800 rpm for 50~70 min to obtain a premixed material. S2. Granulation: The premixed materials are melt-blended and granulated through a twin-screw extruder to obtain composite masterbatch; S3. Molding: The composite masterbatch is placed in a preheated mold and hot-pressed. After cooling, it is heat-treated by a programmed heating process. After cooling to room temperature, it is demolded to obtain the plastic sheet.

8. The method for preparing high-temperature resistant and wear-resistant plastic sheet according to claim 7, characterized in that, In step S2, the specific processing temperatures of the twin-screw extruder are set as follows: Zone 1 320℃, Zone 2 350℃, Zone 3 370~375℃, Zone 4 375~380℃, Zone 5 370℃, and the die head 360℃, with a screw speed of 200~300 rpm.

9. The method for preparing the high-temperature resistant and wear-resistant plastic sheet according to claim 7, characterized in that, In step S3, the temperature during hot pressing is 355~365℃, the pressure is 10~15 MPa, and the holding time is 20~40 min.

10. The method for preparing the high-temperature resistant and wear-resistant plastic sheet according to claim 7, characterized in that, In step S3, the programmed temperature rise heat treatment is as follows: first, the temperature is raised to 180-200℃ at 2-4℃ / min and held for 60-90min, then the temperature is raised to 240-260℃ at 2℃ / min and held for 45-60min.

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