EPDM material with low friction coefficient and high wear resistance and preparation method thereof

Abstract

The invention provides an EPDM (Ethylene-Propylene-Diene Monomer) material with a low friction coefficient and high wear resistance and a preparation method thereof. The EPDM material is prepared from the following raw materials in parts by mass: 100 parts of EPDM, 80-150 parts of HDPE (High-Density Polyethylene), 10-30 parts of a PTFE / MoS2 composite material, 2-6 parts of zinc oxide, 1-3 parts of stearic acid, 60-100 parts of reinforced carbon black, 1-5 parts of an anti-aging agent, 1-3 parts of calcium oxide, 1-4 parts of a coupling agent, 0.5-2 parts of a vulcanizing agent, 4-8 parts of a vulcanization accelerator and 0.1-0.5 part of a scorch retarder. According to the EPDM material disclosed by the invention, EPDM is adopted as a matrix, and auxiliary materials such as HDPE, PTFE / MoS2 composite materials and the like are matched, so that the obtained EPDM material has the advantages of small frictional resistance and excellent wear resistance and mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber materials, and particularly relates to an EPDM material with a low friction coefficient and high wear resistance and a preparation method thereof. Background Art

[0002] The automotive glass run channel seal plays a role in sealing and guiding the window glass. Since the window glass directly rubs against the glass run channel seal when it rises and falls, the glass run channel seal is required to have good wear resistance and a small frictional resistance.

[0003] The automotive glass run channel seal is composed of a matrix material and a friction layer material. The matrix materials include EPDM, thermoplastic elastomer, polyvinyl chloride, etc. Among them, EPDM has excellent comprehensive performance, good aging resistance, ultraviolet resistance, high and low temperature resistance, and outstanding acid and alkali resistance. It has strong environmental adaptability, excellent elasticity and permanent deformation resistance, and is currently the matrix material most commonly used for rubber automotive glass run channel seals. The friction layer usually adopts three processes, namely flocking, spraying, and compounding with a polyethylene (PE) strip, to reduce the frictional resistance of the glass run channel and improve the wear resistance.

[0004] For the flocking of the lip position of the seal strip in contact with the glass, although it can ensure no abnormal noise to a certain extent during the glass lifting and lowering, the flocking fibers are easily prone to hair loss phenomenon due to the frequent friction during the glass lifting and lowering, which affects the cleanliness and beauty of the glass, and at the same time affects its noise reduction effect. The spraying process refers to spraying after the friction surface of the glass run channel seal is subjected to plasma treatment. The coating is generally polyurethane. The disadvantage is that it requires two processes and is relatively cumbersome. Extrusion compounding is to melt thermoplastic materials such as polyethylene in an extruder and then extrude it into a flat die orifice. After flowing out as a sheet-like film, it is immediately compounded with another or two films through a cooling roll and a compounding roll. Although the processing cost is relatively low, the loss is relatively large during heating and resin replacement, and the extrusion flatness is also poor, and quality control is relatively difficult.

[0005] Currently, in order to further improve the wear resistance of the surface of the glass run channel seal, co-extruding a low friction coefficient and high wear resistance EPDM material with a common EPDM material to replace the spraying process on the surface of the EPDM run channel has become a new technological innovation trend. Summary of the Invention

[0006] Based on the technical problems existing in the background art, the present invention proposes an EPDM material with a low friction coefficient and high wear resistance and a preparation method thereof. By using EPDM as the matrix and cooperating with auxiliary materials such as HDPE and PTFE / MoS2 composite materials, the obtained EPDM material has the advantages of small frictional resistance, excellent wear resistance and mechanical properties.

[0007] A low-friction coefficient and high-wear-resistant EPDM material proposed by the present invention is made of the following raw materials in parts by mass: 100 parts of EPDM, 80 - 150 parts of HDPE, 10 - 30 parts of PTFE / MoS2 composite material, 2 - 6 parts of zinc oxide, 1 - 3 parts of stearic acid, 60 - 100 parts of reinforcing carbon black, 1 - 5 parts of antioxidant, 1 - 3 parts of calcium oxide, 1 - 4 parts of coupling agent, 0.5 - 2 parts of vulcanizing agent, 4 - 8 parts of vulcanization accelerator, and 0.1 - 0.5 parts of scorch retarder.

[0008] In the present invention, EPDM and HDPE are used as the matrix, which have the advantages of excellent weather resistance and good compression set performance. In the added PTFE / MoS2 composite material, PTFE has an extremely low friction coefficient, which can greatly improve the lubrication performance of the rubber. MoS2 can reduce friction at low temperatures, and at the same time can also improve the gloss, wear resistance, anti-fouling and tensile properties of the rubber. Therefore, after the composite material formed by the combination of PTFE and MoS2 is added, the EPDM material can have a low friction coefficient, high wear resistance and excellent mechanical properties.

[0009] Preferably, the ethylene content of the EPDM is 40 - 80%, and the Mooney viscosity [ML 100℃(1 + 4)] is above 50.

[0010] Preferably, the density of the HDPE is 0.940 - 0.976 g / cm 3 , and the melt index is 1 - 20 g / min. The melt index is the melt index measured under condition G of the standard method GB / T 3682 - 2000.

[0011] Preferably, the PTFE / MoS2 composite material is obtained by adhering polydopamine on the surface of PTFE powder and then performing a hydrothermal reaction with thiourea and a molybdenum source; Preferably, the mass ratio of the PTFE powder, thiourea and molybdenum source is 1:0.8 - 1.5:0.5 - 1; Preferably, the molybdenum source is at least one of sodium molybdate or ammonium molybdate.

[0012] In the present invention, after polydopamine (PDA) is adhered to the PTFE powder, due to the high adhesiveness, modifiable groups and active sites of PDA itself, especially the catechol groups on it can react with the amino groups on thiourea through Michael addition and Schiff base reactions, so that thiourea adheres to the surface of the PTFE powder. Thereafter, the thiourea adhering to the surface of the PTFE powder reacts chemically with the molybdenum source as a sulfur source, and the generated MoS2 nanosheets grow uniformly on the surface of the PTFE powder, forming the PTFE / MoS2 composite material; This PTFE / MoS2 composite material is used in the EPDM matrix. By exerting the load-bearing and wear-resistant functions of PTFE and the interlayer slip performance of MoS2 (anti-friction and lubrication effect), compared with pure PTFE and MoS2, it can endow the EPDM material with more excellent anti-friction and wear-resistant properties, achieving a synergistic enhancement effect on the tribological properties of the EPDM material. In addition, since MoS2 is an inorganic material and PTFE is an organic material, MoS2 loaded on the surface of PTFE can be effectively dispersed in the EPDM material. Moreover, the growth of MoS2 on the surface of PTFE can alleviate the agglomeration effect of single MoS2 in the rubber matrix due to its high surface energy, thereby significantly enhancing the tribological properties of the EPDM material.

[0013] Preferably, the reinforcing carbon black is at least one of carbon black N550, carbon black N220, carbon black N330 or carbon black N774.

[0014] In the present invention, the reinforcing carbon black can improve the mechanical properties of the EPDM material and the ability to resist wear and damage, and cooperate with other additives to improve the mechanical properties such as heat resistance and hardness of the rubber.

[0015] Preferably, the vulcanizing agent is at least one of sulfur, DCP, BIBP or DBPMH, and the vulcanization accelerator is at least one of accelerator TT, accelerator M, accelerator DM, accelerator BZ, accelerator CZ or accelerator TRA.

[0016] Preferably, the anti-aging agent is at least one of anti-aging agent MB, anti-aging agent RD, anti-aging agent 445, anti-aging agent 6PPD or anti-aging agent 4010NA.

[0017] In the present invention, the anti-aging agent can enhance the aging resistance of the rubber, effectively slow down the aging speed and degree of aging, and extend the service life of the rubber material.

[0018] Preferably, the coupling agent is at least one of a silane coupling agent or a titanate coupling agent, preferably at least one of silane coupling agent A151, silane coupling agent A172, silane coupling agent Si-69 or silane coupling agent KH-580.

[0019] In the present invention, the coupling agent can chemically react with the surface of the reinforcing carbon black, thereby improving the compatibility of the reinforcing carbon black in EPDM and enhancing its dispersion performance, and further enabling the reinforcing carbon black to fully exert its reinforcing performance.

[0020] The present invention also provides a method for preparing the above-mentioned EPDM material with low friction coefficient and high wear resistance, which includes: adding EPDM, HDPE, PTFE / MoS2 composite material, zinc oxide, stearic acid, reinforcing carbon black, antioxidant, calcium oxide and coupling agent into a mixer for mixing, discharging the rubber when the temperature rises to 160-170°C; adding the obtained rubber compound into the mixer again, adding vulcanizing agent, vulcanization accelerator and scorch retarder for mixing, discharging the rubber when the temperature rises to 80-100°C, and then extruding and vulcanizing and molding to obtain the EPDM material with low friction coefficient and high wear resistance.

[0021] Preferably, the vulcanization molding temperature is 200-230°C.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The use of PTFE / MoS2 composite material in the present invention can endow the EPDM material with low friction and wear resistance. At the same time, HDPE and EPDM with high ethylene content are used to increase the hardness and fluidity of the EPDM material, improve the wear resistance and increase the fluidity during the extrusion of the mixed rubber.

[0023] (2) The use of PTFE / MoS2 composite material in the present invention can not only improve the permanent wear resistance of the EPDM material, but also have little influence on its own mechanical properties, thus ensuring the high mechanical properties of the EPDM material. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the SEM diagram of the EPDM material with low friction coefficient and high wear resistance described in Example 1 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, the technical solutions of the present invention will be described in detail through specific examples. However, it should be clearly stated that these examples are for illustrative purposes only and are not construed as limiting the scope of the present invention.

[0026] The EPDM is purchased from Lanxess Germany, and the model is EPDM 8550C; The HDPE is purchased from Qilu Petrochemical Company, and the model is DGDA6098; The PTFE powder is purchased from DuPont USA, and the model is MP1200; The MoS2 is purchased from Suzhou Kaifa New Material Technology Co., Ltd., with a thickness of 10-15 nm and a diameter of 300-400 nm; The zinc oxide is purchased from Jining Bora Carbon Materials Co., Ltd.; The stearic acid is purchased from Donghai Chemical Raw Materials Co., Ltd.; The reinforcing carbon black is purchased from Cabot Shanghai; The antioxidant is purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; The calcium oxide is purchased from Kettlitz Germany; The silane coupling agent is purchased from Shanghai Kayin Chemical Co., Ltd.; The vulcanizing agent was purchased from Ningbo Liuhua Polymer Co., Ltd.; the vulcanization accelerator was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; the scorch retarder was purchased from Shandong Yanggu Huatai Chemical Industry Co., Ltd.

[0027] Example 1

[0028] A low-friction coefficient and high-wear-resistant EPDM material is made from the following raw materials in parts by mass: 100 parts of EPDM, 120 parts of HDPE, 20 parts of PTFE / MoS2 composite material, 4 parts of zinc oxide, 2 parts of stearic acid, 80 parts of carbon black N550, 3 parts of antioxidant 4010NA, 2 parts of calcium oxide, 2 parts of silane coupling agent A151, 1 part of sulfur, 1.5 parts of accelerator TT (tetramethylthiuram disulfide), 1.5 parts of accelerator CZ (N-cyclohexyl-2-benzothiazole sulfenamide), 2 parts of accelerator M (2-mercaptobenzothiazole), and 0.3 part of scorch retarder CTP; The PTFE / MoS2 composite material is prepared by the following method: Add dopamine hydrochloride to a tris(hydroxymethyl)aminomethane buffer solution and stir to dissolve to obtain a dopamine solution with a concentration of 0.05 mol / L (pH = 8.5). Then add ammonium persulfate and ethylenediamine in an equimolar amount to dopamine hydrochloride. After stirring and dissolving completely, add PTFE powder with the same mass as dopamine hydrochloride, stir and react for 6 h, then filter, wash with water, and dry to obtain PTFE powder adhered with polydopamine; Add the PTFE powder adhered with polydopamine to deionized water and disperse it evenly by ultrasonic wave. Under stirring conditions, add thiourea and sodium molybdate. The mass ratio of the PTFE powder, thiourea, and sodium molybdate is 1:1.2:0.8. After stirring and reacting for 4 h, place it in a reaction kettle and react at 200 °C for another 36 h, then filter, wash with water, and dry to obtain the PTFE / MoS2 composite material.

[0029] The preparation method of the above low-friction coefficient and high-wear-resistant EPDM material includes: Add EPDM, HDPE, PTFE / MoS2 composite material, zinc oxide, stearic acid, antioxidant 4010NA, and calcium oxide into a mixer according to the above parts by mass, break the rubber and mix at a speed of 35 rpm for 50 s, then add carbon black N550 and silane coupling agent A151 and continue to mix for 60 s. Raise and lower the upper plug once respectively when the temperature reaches 100 °C, 120 °C, and 140 °C to turn the rubber compound over, and discharge the rubber when the temperature reaches 160 °C to obtain a first-stage mixed rubber; After the first-stage mixed rubber is parked for at least 8 h, add sulfur, accelerator TT, accelerator CZ, accelerator M, and scorch retarder CTP, mix until 90 °C and then discharge the rubber to obtain a second-stage mixed rubber; Feed the second-stage mixed rubber into a 60-type rubber extruder and co-extrude with the sealing strip of the EPDM substrate through a die, and then microwave vulcanize and form at 220 °C to obtain the low-friction coefficient and high-wear-resistant EPDM material.

[0030] Example 2

[0031] A low friction coefficient and high wear resistance EPDM material, which is made of the following raw materials in parts by mass: 100 parts of EPDM, 80 parts of HDPE, 30 parts of PTFE / MoS2 composite material, 2 parts of zinc oxide, 3 parts of stearic acid, 60 parts of carbon black N330, 5 parts of antioxidant RD, 1 part of calcium oxide, 1 part of silane coupling agent A172, 0.5 parts of sulfur, 1 part of accelerator TT, 2 parts of accelerator CZ, 3 parts of accelerator M, 2 parts of accelerator BZ (zinc dibutyl dithiocarbamate) and 0.1 parts of anti-scorch agent CTP; The PTFE / MoS2 composite material is prepared by the method described in Example 1.

[0032] The preparation method of the above-mentioned EPDM material with low friction coefficient and high wear resistance comprises: adding EPDM, HDPE, PTFE / MoS2 composite material, zinc oxide, stearic acid, antioxidant RD and calcium oxide into an internal mixer according to the above-mentioned mass parts, mixing for 50 seconds at a speed of 35 rpm, then adding carbon black N330 and silane coupling agent A172 and continuing to mix for 60 seconds, and when the temperature reaches 100°C, 120°C and 140°C, respectively, raising and lowering the top bolt once to turn the rubber material over. , after the temperature reaches 170°C, the rubber is discharged to obtain a first-stage mixed rubber; after the first-stage mixed rubber is left for at least 8 hours, sulfur, accelerator TT, accelerator CZ, accelerator M, accelerator BZ and anti-scorch agent CTP are added, and the mixture is mixed to 80°C and then discharged to obtain a second-stage mixed rubber; the second-stage mixed rubber is fed into a 60-type rubber extruder, extruded together with a sealing strip of an EPDM substrate, and then vulcanized by microwave at 230°C to obtain the EPDM material with a low friction coefficient and high wear resistance.

[0033] Example 3

[0034] A low friction coefficient and high wear resistance EPDM material, which is made of the following raw materials in parts by mass: 100 parts of EPDM, 150 parts of HDPE, 10 parts of PTFE / MoS2 composite material, 6 parts of zinc oxide, 1 part of stearic acid, 100 parts of carbon black N550, 1 part of antioxidant 4010NA, 3 parts of calcium oxide, 4 parts of silane coupling agent A151, 2 parts of sulfur, 1.5 parts of accelerator TT (tetramethylthiuram disulfide), 1.5 parts of accelerator CZ (N-cyclohexyl-2-benzothiazole sulfonamide), 1 part of accelerator M (2-thiolbenzothiazole) and 0.5 parts of anti-scorch agent CTP; The PTFE / MoS2 composite material is prepared by the method described in Example 1.

[0035] The preparation method of the above EPDM material with low friction coefficient and high wear resistance includes: adding EPDM, HDPE, PTFE / MoS2 composite material, zinc oxide, stearic acid, antioxidant 4010NA and calcium oxide into a mixer according to the above mass parts, breaking and mixing at a speed of 35 rpm for 50 s, then adding carbon black N550 and silane coupling agent A151 and continuing to mix for 60 s. Lift and lower the upper plug once respectively when the temperature reaches 100 °C, 120 °C, and 140 °C to flip the rubber compound, and discharge the rubber compound when the temperature reaches 160 °C to obtain the first-stage mixed rubber compound; after parking the first-stage mixed rubber compound for at least 8 h, add sulfur, accelerator TT, accelerator CZ, accelerator M and scorch retarder CTP, mix until 100 °C and then discharge the rubber compound to obtain the second-stage mixed rubber compound; feed the second-stage mixed rubber compound into a 60-type rubber extruder, co-extrude with the sealing strip of the EPDM substrate through a die, and then microwave vulcanize and mold at 200 °C to obtain the above EPDM material with low friction coefficient and high wear resistance.

[0036] Comparative Example 1 An EPDM material is made from the following raw materials in mass parts: 100 parts of EPDM, 120 parts of HDPE, 12 parts of PTFE powder, 8 parts of MoS2, 4 parts of zinc oxide, 2 parts of stearic acid, 80 parts of carbon black N550, 3 parts of antioxidant 4010NA, 2 parts of calcium oxide, 2 parts of silane coupling agent A151, 1 part of sulfur, 1.5 parts of accelerator TT (tetramethylthiuram disulfide), 1.5 parts of accelerator CZ (N-cyclohexyl-2-benzothiazole sulfenamide), 2 parts of accelerator M (2-mercaptobenzothiazole) and 0.3 parts of scorch retarder CTP.

[0037] The preparation method of the above EPDM material with low friction coefficient and high wear resistance includes: adding EPDM, HDPE, PTFE powder, MoS2, zinc oxide, stearic acid, antioxidant 4010NA and calcium oxide into a mixer according to the above mass parts, breaking and mixing at a speed of 35 rpm for 50 s, then adding carbon black N550 and silane coupling agent A151 and continuing to mix for 60 s. Lift and lower the upper plug once respectively when the temperature reaches 100 °C, 120 °C, and 140 °C to flip the rubber compound, and discharge the rubber compound when the temperature reaches 160 °C to obtain the first-stage mixed rubber compound; after parking the first-stage mixed rubber compound for at least 8 h, add sulfur, accelerator TT, accelerator CZ, accelerator M and scorch retarder CTP, mix until 90 °C and then discharge the rubber compound to obtain the second-stage mixed rubber compound; feed the second-stage mixed rubber compound into a 60-type rubber extruder, co-extrude with the sealing strip of the EPDM substrate through a die, and then microwave vulcanize and mold at 220 °C to obtain the above EPDM material with low friction coefficient and high wear resistance.

[0038] Comparative Example 2 An EPDM material is made from the following raw materials in parts by mass: 100 parts of EPDM, 120 parts of HDPE, 20 parts of PTFE / MoS2 composite material, 4 parts of zinc oxide, 2 parts of stearic acid, 80 parts of carbon black N550, 3 parts of antioxidant 4010NA, 2 parts of calcium oxide, 2 parts of silane coupling agent A151, 1 part of sulfur, 1.5 parts of accelerator TT (tetramethylthiuram disulfide), 1.5 parts of accelerator CZ (N-cyclohexyl-2-benzothiazole sulfenamide), 2 parts of accelerator M (2-mercaptobenzothiazole), and 0.3 parts of scorch retarder CTP; The PTFE / MoS2 composite material is prepared by the following method: Add dopamine hydrochloride to a tris(hydroxymethyl)aminomethane buffer solution and stir to dissolve to obtain a dopamine solution with a concentration of 0.05 mol / L (pH = 8.5). Then add ammonium persulfate and ethylenediamine in an equimolar amount to dopamine hydrochloride. After stirring and dissolving completely, add PTFE powder with the same mass as dopamine hydrochloride, stir and react for 6 h, then filter, wash with water, and dry to obtain PTFE powder adhered with polydopamine; Add the PTFE powder adhered with polydopamine to deionized water and disperse it evenly by ultrasonic wave. Add MoS2 under stirring conditions. The mass ratio of the PTFE powder to MoS2 is 1:0.65. After stirring and reacting for 4 h, filter, wash with water, and dry to obtain the PTFE / MoS2 composite material.

[0039] The preparation method of the above EPDM material with low friction coefficient and high wear resistance includes: Add EPDM, HDPE, PTFE / MoS2 composite material, zinc oxide, stearic acid, antioxidant 4010NA, and calcium oxide into a mixer according to the above parts by mass. Break and mix at a speed of 35 rpm for 50 s, then add carbon black N550 and silane coupling agent A151 and continue to mix for 60 s. Raise and lower the upper plug once respectively when the temperature reaches 100 °C, 120 °C, and 140 °C to turn the rubber compound, and discharge the rubber compound when the temperature reaches 160 °C to obtain a first-stage mixed rubber compound; After parking the first-stage mixed rubber compound for at least 8 h, add sulfur, accelerator TT, accelerator CZ, accelerator M, and scorch retarder CTP, mix until 90 °C and then discharge the rubber compound to obtain a second-stage mixed rubber compound; Feed the second-stage mixed rubber compound into a 60-type rubber extruder and co-extrude it with the sealing strip of the EPDM substrate through a common mold, and then microwave vulcanize and form it at 220 °C to obtain the above EPDM material with low friction coefficient and high wear resistance.

[0040] Performance test: Perform the performance tests shown in Table 1 on the EPDM materials in the above examples and comparative examples, and the test results are shown in Table 2.

[0041]

[0042] For the abrasion grade (dry abrasion), after 16 hours in an environment meeting the standard temperature and humidity requirements, 3 specimens are subjected to a wear test. With a load of 2 kg, if there is no bottom leakage after 30,000 abrasion-resistant cycles, it is regarded as ≥ grade 4. For the abrasion grade (wet abrasion), after 16 hours in a standard temperature and humidity environment, the specimens are immersed in clean water at (23 ± 2) °C for 1 hour and then taken out. The wear test is carried out in a wet state while keeping it wet. Every 2,000 friction cycles, 2 mL of clean water is added to the specimens. With a load of 2 kg, if there is no bottom leakage after 25,000 abrasion-resistant cycles, it is regarded as ≥ grade 4.

[0043] As can be seen from Table 2, the EPDM material prepared in the examples has excellent comprehensive performance. After testing, its tensile strength is greater than 15 MPa, the elongation at break is greater than 150%, the change rate after 168-hour hot air aging at 100 °C is small, and it has more excellent low friction coefficient and high wear resistance.

[0044] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A low-friction coefficient and high-wear-resistant EPDM material, characterized in that, It is made from the following raw materials in parts by mass: 100 parts of EPDM, 80 - 150 parts of HDPE, 10 - 30 parts of PTFE / MoS₂ composite material, 2 - 6 parts of zinc oxide, 1 - 3 parts of stearic acid, 60 - 100 parts of reinforcing carbon black, 1 - 5 parts of antioxidant, 1 - 3 parts of calcium oxide, 1 - 4 parts of coupling agent, 0.5 - 2 parts of vulcanizing agent, 4 - 8 parts of vulcanization accelerator and 0.1 - 0.5 parts of scorch retarder.

2. The low-friction coefficient and high-wear-resistant EPDM material according to claim 1, characterized in that, The ethylene content of the EPDM is 40 - 80%, and the Mooney viscosity under the test conditions of ML1+4, 100 °C is above 50.

3. The low-friction coefficient and high-wear-resistant EPDM material according to claim 1, characterized in that, The density of the HDPE is 0.940 - 0.976 g / cm 3 , and the melt index is 1 - 20 g / min. The melt index is measured under condition G of the standard method in GB / T 3682 - 2000.

4. The low-friction coefficient and high-wear-resistant EPDM material according to any one of claims 1-3, characterized in that The PTFE / MoS₂ composite material is obtained by subjecting PTFE powder with adhered polydopamine on its surface to hydrothermal reaction with thiourea and molybdenum source; The mass ratio of the PTFE powder, thiourea and molybdenum source is 1:0.8 - 1.5:0.5 - 1.

5. The low-friction coefficient and high-wear-resistant EPDM material according to any one of claims 1-3, characterized in that, The reinforcing carbon black is at least one of carbon black N550, carbon black N220, carbon black N330 or carbon black N774.

6. The low-friction coefficient and high-wear-resistant EPDM material according to any one of claims 1-3, characterized in that The vulcanizing agent is at least one of sulfur, DCP, BIBP or DBPMH, and the vulcanization accelerator is at least one of accelerator TT, accelerator M, accelerator DM, accelerator BZ, accelerator CZ or accelerator TRA.

7. The EPDM material with low coefficient of friction and high wear resistance according to any one of claims 1-3, characterized in that The antioxidant is at least one of antioxidant MB, antioxidant RD, antioxidant 445, antioxidant 6PPD or antioxidant 4010NA.

8. The low-friction coefficient and high-wear-resistant EPDM material according to any one of claims 1-3, characterized in that, The coupling agent is at least one of silane coupling agent A151, silane coupling agent A172, silane coupling agent Si - 69 or silane coupling agent KH - 580.

9. A method for preparing the EPDM material with low coefficient of friction and high wear resistance according to any one of claims 1-8, characterized in that, It includes: Adding EPDM, HDPE, PTFE / MoS₂ composite material, zinc oxide, stearic acid, reinforcing carbon black, antioxidant, calcium oxide and coupling agent into a mixer for mixing, discharging the rubber when the temperature is raised to 160 - 170 °C; adding the obtained rubber compound into the mixer again, adding vulcanizing agent, vulcanization accelerator and scorch retarder for mixing, discharging the rubber when the temperature is raised to 80 - 100 °C, and then extruding and vulcanizing and molding to obtain the EPDM material with low friction coefficient and high wear resistance.

10. The preparation method of the EPDM material with low friction coefficient and high wear resistance according to claim 9, characterized in that, The vulcanization and molding temperature is 200 - 230 °C.

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