Preparation method of wear-resistant polytetrafluoroethylene

Abstract

The application discloses a preparation method of wear-resistant polytetrafluoroethylene, and relates to the technical field of high polymer materials, and comprises the following raw materials in parts by weight: 80-90 parts of polytetrafluoroethylene resin, 10-20 parts of acrylic modified polyether ether ketone, 1-3 parts of graphene oxide quantum dots, 1-3 parts of a coupling agent, 8-12 parts of nano particles and 3-5 parts of nano boron fiber. The polytetrafluoroethylene has excellent wear resistance, stable performance, sufficient processing performance and long service life.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a method for preparing wear-resistant polytetrafluoroethylene. Background Technology

[0002] Polytetrafluoroethylene (PTFE) is a high-performance polymer material with numerous advantages, including resistance to high and low temperatures, corrosion resistance, good insulation, and non-stick properties. It is widely used in chemical, mechanical, electronic, and aerospace industries. However, PTFE has poor wear resistance and is easily worn under sliding friction conditions. This significantly limits its application in situations requiring high wear resistance, such as bearings, seals, and automotive shock absorbers.

[0003] Currently, various methods have been used to improve the wear resistance of polytetrafluoroethylene (PTFE) materials. Among them, filler modification is a very convenient and effective method. Filling PTFE with micron-sized materials such as glass fiber, carbon fiber, or graphite, as well as nanomaterials such as carbon nanotubes or graphene, can effectively improve the wear resistance of PTFE materials. However, the above methods have problems such as complex processes, high costs, unsatisfactory improvement effects, uneven dispersion that easily leads to large fluctuations in mechanical properties and wear resistance, and insufficient processing fluidity.

[0004] To address the aforementioned issues, patent document CN110105695B discloses a high-wear-resistant polytetrafluoroethylene (PTFE) composite material and its preparation method. The composite material is made from the following raw materials in parts by weight: 100 parts PTFE, 0.1-1 parts rare earth oxides, 0.5-2 parts fluorinated graphene, and 0.5-1 parts multi-walled carbon nanotubes. The preparation method involves ultrasonically dispersing the fluorinated graphene, multi-walled carbon nanotubes, and rare earth oxides in acetone, adding PTFE powder, and ball milling the mixture. The powder is then dried in a vacuum drying oven to obtain a mixed powder. The mixed powder is pressed into a mold under a pressure of 20-50 MPa. After the molded green body is allowed to stand for 24 hours, it is freely sintered in a sintering furnace, held at 365°C for several hours, and then cooled with the furnace to obtain the composite material. The composite material of this invention exhibits a stable coefficient of friction and an ultra-low wear rate. The preparation method is simple, convenient, low-cost, and easy for large-scale industrial production. This composite material can be easily processed into thin sheets for use in rotary ultrasonic motors, improving the speed stability and service life of the ultrasonic motor. However, this technical solution still has obvious limitations: First, the shear force of the ball milling process is insufficient, making it difficult to overcome the π-π stacking effect of fluorinated graphene and multi-walled carbon nanotubes, which leads to the formation of micron-sized agglomerates of nanofillers in the PTFE matrix, affecting the uniformity of wear resistance; Second, the cold pressing sintering process easily generates porosity inside the material, which will accelerate wear under high-load friction conditions; Third, the uneven crystallization rate of PTFE during furnace cooling results in significant anisotropy of the material's mechanical properties, and the friction coefficient still fluctuates greatly, making it difficult to meet the stable operation requirements of precision machinery.

[0005] It is evident that there is a need to seek more effective methods to prepare wear-resistant polytetrafluoroethylene with excellent wear resistance, performance stability, good processability, and long service life. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a method for preparing wear-resistant polytetrafluoroethylene with excellent wear resistance, performance stability, good processability, and long service life.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A wear-resistant polytetrafluoroethylene (PTFE) is made from the following raw materials in parts by weight: 80-90 parts of PTFE resin, 10-20 parts of acrylic acid-modified polyether ether ketone (PEEK), 1-3 parts of graphene oxide quantum dots, 1-3 parts of coupling agent, 8-12 parts of nanoparticles, and 3-5 parts of boron nanofibers.

[0009] Preferably, the polytetrafluoroethylene resin is polytetrafluoroethylene M-18F manufactured by Daikin Industries, Japan, with an average particle size of 25 μm.

[0010] Preferably, the acrylic-modified polyetheretherketone is prepared according to the method of Example 1 in the invention patent document with authorization announcement number CN109337019B.

[0011] Preferably, the graphene oxide quantum dots have 1-5 layers, a thickness of 1-2 nm, and a lateral dimension of 5-15 nm.

[0012] Preferably, the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

[0013] Preferably, the nanoparticles are a mixture of nano-zirconia and nano-boron nitride in a mass ratio of (3-5):1.

[0014] Preferably, the average particle size of the nano-zirconia is 10-80 nm; and the average particle size of the nano-boron nitride is 50-100 nm.

[0015] Preferably, the average diameter of the boron nanofiber is 30-100 nm, and the aspect ratio is (20-25):1.

[0016] Another objective of this invention is to provide a method for preparing the wear-resistant polytetrafluoroethylene, comprising the following steps: mixing the raw materials in parts by weight to obtain a mixture, pressing the mixture into a mold under a certain temperature and pressure; and then sequentially subjecting it to dynamic gradient sintering and radiation treatment to obtain wear-resistant polytetrafluoroethylene.

[0017] Preferably, the specific temperature is 23-30℃.

[0018] Preferably, the pressure is 28-62 MPa and the pressure holding time is 4-6 min.

[0019] Preferably, the dynamic gradient sintering is carried out in a vacuum sintering furnace, specifically as follows: heating to 300°C at a heating rate of 100°C / hour and holding for 1 hour; then heating to 340°C at a heating rate of 40-60°C / hour, during which axial pressure is gradually applied, increasing the pressure from 0 MPa to 5-8 MPa, and maintaining this pressure at 340°C for 2 hours; then heating to 380°C at a heating rate of 50-80°C / hour, adjusting the axial pressure back to 0 MPa, and holding for 2 hours; finally, cooling from 380°C to 25°C at a cooling rate of 5°C / min, with the axial pressure maintained at 0 MPa throughout the cooling process.

[0020] Preferably, the radiation treatment is electron beam irradiation, with an irradiation dose of 20–1000 kGy; the irradiation rate is controlled at 10–20 m / min.

[0021] The beneficial effects of adopting the above technical solution are as follows:

[0022] (1) The wear-resistant polytetrafluoroethylene (PTFE) provided by this invention forms a complementary structure between PTFE resin and acrylic-modified polyetheretherketone (PEEK), combined with the nano-reinforcing effect of graphene oxide quantum dots, and further supplemented with a specific ratio of nanoparticles and nano-boron fibers to construct a multi-dimensional reinforcing network. This combination retains the corrosion resistance and lubricity of PTFE, while addressing its insufficient wear resistance through material modification. Compared with existing single-filler modification technologies, it achieves a synergistic leap in performance.

[0023] (2) The wear-resistant polytetrafluoroethylene provided by this invention adopts a combination of stepped heating and dynamic pressure control, which precisely controls the pressure change at different temperature stages. This not only avoids internal material defects caused by thermal stress in traditional sintering, but also promotes uniform diffusion and interfacial fusion of various components. This process enables nanoparticles to be more uniformly embedded in the matrix, significantly improving the material density and wear resistance, far exceeding the effect of conventional isothermal sintering.

[0024] (3) The wear-resistant polytetrafluoroethylene provided by this invention introduces electron beam radiation treatment to form a unique molecular cross-linking mechanism. By controlling a specific dose and irradiation rate, a moderately cross-linked structure is formed inside the material, which not only enhances the interaction force between molecular chains but also avoids the increase in brittleness caused by excessive cross-linking. This treatment works synergistically with the sintering process to further optimize the wear resistance and mechanical strength of the material, which is an important breakthrough for existing physical modification methods.

[0025] (4) The wear-resistant polytetrafluoroethylene provided by this invention has the advantage of precise selection of raw material parameters. From the specific type and particle size of polytetrafluoroethylene resin, to the number of layers and size control of graphene oxide quantum dots, and the optimization of nanoparticle ratio and fiber aspect ratio, all have been specifically designed. This refined parameter control ensures that each component performs at its best, and compared with the broad selection of raw material parameters in the prior art, it significantly improves the stability and controllability of material performance.

[0026] (5) The wear-resistant polytetrafluoroethylene provided by this invention, through the organic combination of raw material synergy, process innovation and parameter optimization, enables the product to maintain the original excellent properties of polytetrafluoroethylene while improving wear resistance far beyond existing modification technologies, and at the same time has better mechanical properties and aging resistance. This multi-performance synergistic enhancement effect solves the technical problem of difficulty in balancing performance in traditional polytetrafluoroethylene wear-resistant modification.

[0027] (6) The wear-resistant polytetrafluoroethylene provided by the present invention is made from the following raw materials in parts by weight: 80-90 parts of polytetrafluoroethylene resin, 10-20 parts of acrylic acid modified polyether ether ketone, 1-3 parts of graphene oxide quantum dots, 1-3 parts of coupling agent, 8-12 parts of nanoparticles, and 3-5 parts of nano boron fiber; through the mutual cooperation and synergistic effect of the raw materials, the polytetrafluoroethylene produced has excellent wear resistance, good performance stability and processing performance, and long service life. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of the present invention and to make the above-mentioned features, objectives, and advantages of the present invention clearer and easier to understand, the present invention will be further described below with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0029] Example 1

[0030] A wear-resistant polytetrafluoroethylene (PTFE) is made from the following raw materials in parts by weight: 80 parts of PTFE resin, 10 parts of acrylic acid-modified polyether ether ketone (PEEK), 1 part of graphene oxide quantum dots, 1 part of coupling agent, 8 parts of nanoparticles, and 3 parts of boron nanofibers.

[0031] The polytetrafluoroethylene resin is polytetrafluoroethylene M-18F manufactured by Daikin Industries, Japan, with an average particle size of 25 μm; the acrylic acid-modified polyetheretherketone is prepared according to the method of Example 1 in the invention patent document CN109337019B; the graphene oxide quantum dots have 1-5 layers, a thickness of 1-2 nm, and a lateral dimension of 5-15 nm; the coupling agent is silane coupling agent KH550; the nanoparticles are nano-zirconia and nano-boron nitride mixed in a mass ratio of 3:1; the average particle size of the nano-zirconia is 10 nm; the average particle size of the nano-boron nitride is 50 nm; the average diameter of the nano-boron fibers is 30 nm, and the aspect ratio is 20:1.

[0032] A method for preparing wear-resistant polytetrafluoroethylene includes the following steps: mixing raw materials in parts by weight to obtain a mixture, pressing the mixture into a mold at a certain temperature and pressure; then sequentially subjecting it to dynamic gradient sintering and radiation treatment to obtain wear-resistant polytetrafluoroethylene; the certain temperature is 23°C; the certain pressure is 28 MPa; and the holding time is 4 min.

[0033] The dynamic gradient sintering is carried out in a vacuum sintering furnace, specifically as follows: heating to 300°C at a heating rate of 100°C / hour and holding for 1 hour; then heating to 340°C at a heating rate of 40°C / hour, during which axial pressure is gradually applied, increasing from 0 MPa to 5 MPa, and maintaining this pressure at 340°C for 2 hours; then heating to 380°C at a heating rate of 50°C / hour, adjusting the axial pressure back to 0 MPa, and holding for 2 hours; finally, cooling from 380°C to 25°C at a cooling rate of 5°C / min, with the axial pressure maintained at 0 MPa throughout the cooling process.

[0034] The radiation treatment was electron beam irradiation with a dose of 20 kGy and an irradiation rate of 10 m / min. The electron beam irradiation was carried out using a 3 MeV / 40 mA "ground nanometer" type electron accelerator developed by the Shanghai Institute of Applied Physics, Chinese Academy of Sciences.

[0035] Example 2

[0036] A wear-resistant polytetrafluoroethylene (PTFE) is made from the following raw materials in parts by weight: 83 parts polytetrafluoroethylene resin, 12 parts acrylic acid-modified polyether ether ketone (PEEK), 1.5 parts graphene oxide quantum dots, 1.5 parts coupling agent, 9 parts nanoparticles, and 3.5 parts boron nanofibers.

[0037] The polytetrafluoroethylene resin is polytetrafluoroethylene M-18F manufactured by Daikin Industries, Japan, with an average particle size of 25 μm; the acrylic acid-modified polyetheretherketone is prepared according to the method of Example 1 in the invention patent document CN109337019B; the graphene oxide quantum dots have 1-5 layers, a thickness of 1-2 nm, and a lateral dimension of 5-15 nm; the coupling agent is silane coupling agent KH560; the nanoparticles are a mixture of nano-zirconia and nano-boron nitride at a mass ratio of 3.5:1; the average particle size of the nano-zirconia is 30 nm; the average particle size of the nano-boron nitride is 70 nm; the average diameter of the nano-boron fibers is 60 nm, and the aspect ratio is 22:1.

[0038] A method for preparing wear-resistant polytetrafluoroethylene includes the following steps: mixing the raw materials according to their weight proportions to obtain a mixture; pressing the mixture into a mold under a certain temperature and a certain pressure; and then sequentially subjecting it to dynamic gradient sintering and radiation treatment to obtain wear-resistant polytetrafluoroethylene; wherein the certain temperature is 26°C; the certain pressure is 42 MPa; and the holding time is 4.5 min.

[0039] The dynamic gradient sintering is carried out in a vacuum sintering furnace, specifically as follows: heating to 300°C at a heating rate of 100°C / hour and holding for 1 hour; then heating to 340°C at a heating rate of 45°C / hour, during which axial pressure is gradually applied, increasing the pressure from 0 MPa to 6 MPa, and maintaining this pressure at 340°C for 2 hours; then heating to 380°C at a heating rate of 60°C / hour, adjusting the axial pressure back to 0 MPa, and holding for 2 hours; finally, cooling from 380°C to 25°C at a cooling rate of 5°C / min, with the axial pressure maintained at 0 MPa throughout the cooling process.

[0040] The radiation treatment was electron beam irradiation with a dose of 80 kGy and an irradiation rate of 13 m / min.

[0041] Example 3

[0042] A wear-resistant polytetrafluoroethylene (PTFE) is made from the following raw materials in parts by weight: 85 parts of PTFE resin, 15 parts of acrylic acid-modified polyether ether ketone (PEEK), 2 parts of graphene oxide quantum dots, 2 parts of coupling agent, 10 parts of nanoparticles, and 4 parts of boron nanofibers.

[0043] The polytetrafluoroethylene resin is polytetrafluoroethylene M-18F manufactured by Daikin Industries, Japan, with an average particle size of 25 μm; the acrylic acid-modified polyetheretherketone is prepared according to the method of Example 1 in the invention patent document CN109337019B; the graphene oxide quantum dots have 1-5 layers, a thickness of 1-2 nm, and a lateral dimension of 5-15 nm; the coupling agent is silane coupling agent KH570; the nanoparticles are a mixture of nano-zirconia and nano-boron nitride at a mass ratio of 4:1; the average particle size of the nano-zirconia is 50 nm; the average particle size of the nano-boron nitride is 80 nm; the average diameter of the nano-boron fibers is 70 nm, and the aspect ratio is 23:1.

[0044] A method for preparing wear-resistant polytetrafluoroethylene includes the following steps: mixing raw materials in parts by weight to obtain a mixture, pressing the mixture into a mold at a certain temperature and pressure; then sequentially subjecting it to dynamic gradient sintering and radiation treatment to obtain wear-resistant polytetrafluoroethylene; the certain temperature is 26°C; the certain pressure is 45 MPa; and the holding time is 5 min.

[0045] The dynamic gradient sintering is carried out in a vacuum sintering furnace, specifically as follows: heating to 300°C at a heating rate of 100°C / hour and holding for 1 hour; then heating to 340°C at a heating rate of 50°C / hour, during which axial pressure is gradually applied, increasing the pressure from 0 MPa to 6.5 MPa, and maintaining this pressure at 340°C for 2 hours; then heating to 380°C at a heating rate of 65°C / hour, adjusting the axial pressure back to 0 MPa, and holding for 2 hours; finally, cooling from 380°C to 25°C at a cooling rate of 5°C / min, with the axial pressure maintained at 0 MPa throughout the cooling process.

[0046] The radiation treatment was electron beam irradiation with a dose of 90 kGy and an irradiation rate of 15 m / min.

[0047] Example 4

[0048] A wear-resistant polytetrafluoroethylene (PTFE) is made from the following raw materials in parts by weight: 88 parts of PTFE resin, 18 parts of acrylic acid-modified polyether ether ketone (PEEK), 2.5 parts of graphene oxide quantum dots, 2.5 parts of coupling agent, 11 parts of nanoparticles, and 4.5 parts of nano-boron fibers.

[0049] The polytetrafluoroethylene resin is polytetrafluoroethylene M-18F manufactured by Daikin Industries, Japan, with an average particle size of 25 μm; the acrylic acid-modified polyetheretherketone is prepared according to the method of Example 1 in the invention patent document CN109337019B; the graphene oxide quantum dots have 1-5 layers, a thickness of 1-2 nm, and a lateral dimension of 5-15 nm; the coupling agent is a mixture of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570 in a mass ratio of 1:2:2; the nanoparticles are a mixture of nano-zirconia and nano-boron nitride in a mass ratio of 4:1; the average particle size of the nano-zirconia is 70 nm; the average particle size of the nano-boron nitride is 90 nm; the average diameter of the nano-boron fibers is 90 nm, and the aspect ratio is 24:1.

[0050] A method for preparing wear-resistant polytetrafluoroethylene includes the following steps: mixing raw materials in parts by weight to obtain a mixture; pressing the mixture into shape under a certain temperature and pressure; and then sequentially subjecting it to dynamic gradient sintering and radiation treatment to obtain wear-resistant polytetrafluoroethylene; wherein the certain temperature is 28°C; the certain pressure is 57 MPa; and the holding time is 5.5 min.

[0051] The dynamic gradient sintering is carried out in a vacuum sintering furnace, specifically as follows: heating to 300°C at a heating rate of 100°C / hour and holding for 1 hour; then heating to 340°C at a heating rate of 55°C / hour, during which axial pressure is gradually applied, increasing the pressure from 0 MPa to 7.5 MPa, and maintaining this pressure at 340°C for 2 hours; then heating to 380°C at a heating rate of 75°C / hour, adjusting the axial pressure back to 0 MPa, and holding for 2 hours; finally, cooling from 380°C to 25°C at a cooling rate of 5°C / min, with the axial pressure maintained at 0 MPa throughout the cooling process.

[0052] The radiation treatment was electron beam irradiation with a dose of 150 kGy and an irradiation rate of 18 m / min.

[0053] Example 5

[0054] A wear-resistant polytetrafluoroethylene (PTFE) is made from the following raw materials in parts by weight: 90 parts of PTFE resin, 20 parts of acrylic acid-modified polyether ether ketone (PEEK), 3 parts of graphene oxide quantum dots, 3 parts of coupling agent, 12 parts of nanoparticles, and 5 parts of boron nanofibers.

[0055] The polytetrafluoroethylene resin is polytetrafluoroethylene M-18F manufactured by Daikin Industries, Japan, with an average particle size of 25 μm; the acrylic acid-modified polyetheretherketone is prepared according to the method of Example 1 in the invention patent document CN109337019B; the graphene oxide quantum dots have 1-5 layers, a thickness of 1-2 nm, and a lateral dimension of 5-15 nm; the coupling agent is silane coupling agent KH550; the nanoparticles are nano-zirconia and nano-boron nitride mixed in a mass ratio of 5:1; the average particle size of the nano-zirconia is 80 nm; the average particle size of the nano-boron nitride is 100 nm; the average diameter of the nano-boron fibers is 100 nm, and the aspect ratio is 25:1.

[0056] A method for preparing wear-resistant polytetrafluoroethylene includes the following steps: mixing raw materials in parts by weight to obtain a mixture, pressing the mixture into a mold at a certain temperature and pressure; then sequentially subjecting it to dynamic gradient sintering and radiation treatment to obtain wear-resistant polytetrafluoroethylene; the certain temperature is 30°C; the certain pressure is 62 MPa; and the holding time is 6 min.

[0057] The dynamic gradient sintering is carried out in a vacuum sintering furnace, specifically as follows: heating to 300°C at a heating rate of 100°C / hour and holding for 1 hour; then heating to 340°C at a heating rate of 60°C / hour, during which axial pressure is gradually applied, increasing the pressure from 0 MPa to 8 MPa, and maintaining this pressure at 340°C for 2 hours; then heating to 380°C at a heating rate of 80°C / hour, adjusting the axial pressure back to 0 MPa, and holding for 2 hours; finally, cooling from 380°C to 25°C at a cooling rate of 5°C / min, with the axial pressure maintained at 0 MPa throughout the cooling process.

[0058] The radiation treatment is electron beam irradiation with a dose of 100 kGy and an irradiation rate of 20 m / min.

[0059] Comparative Example 1

[0060] A wear-resistant polytetrafluoroethylene and its preparation method are basically the same as those in Example 1, except that an equal amount of PEEk5600G is used instead of acrylic acid modified polyether ether ketone.

[0061] Comparative Example 2

[0062] A wear-resistant polytetrafluoroethylene and its preparation method are basically the same as those in Example 1, except that graphene oxide quantum dots are replaced with an equal amount of graphene oxide with a thickness ≤5nm and a sheet diameter of 10μm.

[0063] Comparative Example 3

[0064] A wear-resistant polytetrafluoroethylene and its preparation method are basically the same as those in Example 1, except that an equal amount of carbon fibers with a length of 35-70 micrometers and a diameter of 7 micrometers are used instead of boron nanofibers.

[0065] To further illustrate the unexpected positive technical effects achieved by the wear-resistant polytetrafluoroethylene products in the various embodiments of the present invention, relevant performance tests were conducted on the wear-resistant polytetrafluoroethylene prepared in each example. The test methods are as follows: The wear-resistant polytetrafluoroethylene prepared in Examples 1-5 and Comparative Examples 1-3 were taken, and the friction coefficient and wear volume were tested under the conditions of a load of 30N, a rotation speed of 900 rpm, dry friction for 1 hour, and the grinding ball being GCr15 steel. The results are shown in Table 1.

[0066] Table 1. Test results of wear-resistant polytetrafluoroethylene.

[0067]

[0068]

[0069] As can be seen from Table 1, the wear-resistant polytetrafluoroethylene disclosed in the embodiments of the present invention has better wear resistance than the comparative product. The combined use of acrylic modified polyether ether ketone, graphene oxide quantum dots and boron nanofibers is beneficial to improving the above-mentioned properties.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A wear-resistant polytetrafluoroethylene, characterized in that, The product comprises the following raw materials in parts by weight: 80-90 parts polytetrafluoroethylene resin, 10-20 parts acrylic acid-modified polyetheretherketone, 1-3 parts graphene oxide quantum dots, 1-3 parts coupling agent, 8-12 parts nanoparticles, and 3-5 parts boron nanofibers; the polytetrafluoroethylene resin is polytetrafluoroethylene M-18F manufactured by Daikin Industries, Japan, with an average particle size of 25 μm; the graphene oxide quantum dots have 1-5 layers, a thickness of 1-2 nm, and a lateral dimension of 5-15 nm; the nanoparticles are a mixture of nano-zirconia and nano-boron nitride in a mass ratio of (3-5):1; the average particle size of the nano-zirconia is 10-80 nm; the average particle size of the nano-boron nitride is 50-100 nm; and the average diameter of the nano-boron fibers is 30-100 nm with an aspect ratio of (20-25):

1. The method for preparing wear-resistant polytetrafluoroethylene includes the following steps: mixing the raw materials according to their weight proportions to obtain a mixture; pressing the mixture into a mold under a certain temperature and pressure; then sequentially subjecting it to dynamic gradient sintering and radiation treatment to obtain wear-resistant polytetrafluoroethylene; the dynamic gradient sintering is carried out in a vacuum sintering furnace, specifically: heating to 300℃ at a heating rate of 100℃ / hour and holding for 1 hour; then heating to 340℃ at a heating rate of 40-60℃ / hour, gradually applying axial pressure during the heating process, increasing the pressure from 0MPa to 5-8MPa, and maintaining the temperature... When the temperature reaches 340℃, maintain this pressure and begin heat preservation for 2 hours; then heat to 380℃ at a heating rate of 50-80℃ / hour, adjust the axial pressure back to 0MPa, and preserve for 2 hours; finally, cool the temperature from 380℃ to 25℃ at a cooling rate of 5℃ / min, maintaining the axial pressure at 0MPa throughout the cooling process; the specified temperature is 23-30℃; the specified pressure is 28-62MPa, and the pressure preservation time is 4-6min; the radiation treatment is electron beam irradiation, with an irradiation dose of 20-1000kGy; the irradiation rate is controlled at 10-20m / min.

2. The wear-resistant polytetrafluoroethylene according to claim 1, characterized in that, The coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

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