Thermoplastic wear-resistant composite material and preparation method and application thereof

Abstract

The present application relates to the field of wear-resistant materials, and provides a thermoplastic wear-resistant composite material and a preparation method and application thereof, the thermoplastic wear-resistant composite material comprises the following raw materials in parts by weight: polytetrafluoroethylene 65-75 parts, polyphenylene sulfide 25-35 parts, modified aramid fiber 3-7 parts, and modified molybdenum disulfide 1-5 parts.The thermoplastic wear-resistant composite material has the characteristics of good wear resistance, low friction and high toughness, and can be widely applied to pump bodies and bearing-related wear-resistant components.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant materials, and in particular to a thermoplastic wear-resistant composite material, its preparation method, and its application. Background Technology

[0002] Polytetrafluoroethylene (PTFE) is a high-molecular polymer polymerized from tetrafluoroethylene monomers. It possesses excellent wear resistance, corrosion resistance, aging resistance, and resistance to high and low temperatures. It can be widely used as the main component of wear-resistant materials in components such as bearings on pump bodies in chemical processes, thereby ensuring the smooth operation of the pump shaft. Similarly, polyphenylene sulfide (PPS) is a novel high-performance thermoplastic resin with good thermal stability, chemical corrosion resistance, and wear resistance, and it also shows promising application prospects in the field of wear-resistant materials.

[0003] Although polytetrafluoroethylene (PTFE) and polyphenylene sulfide (PPS) have many excellent characteristics and promising application prospects as wear-resistant materials for pumps, some unresolved issues remain. For example, both PTFE and PPS are brittle and lack toughness, which may shorten the service life of the wear-resistant materials. In addition, long-term friction leading to wear of parts is an important reason for the short service life of various equipment and the instability of machinery. In order to further extend the overall service life of wear-resistant materials, fillers such as molybdenum disulfide are often added to provide lubrication. However, molybdenum disulfide has the problem of easy agglomeration and poor dispersibility, which will prevent its lubrication performance from being fully utilized.

[0004] Patent CN1699474A discloses a hybrid reinforced high-performance composite material for bearings, its manufacturing method, and its application. It is composed of short-cut carbon fibers, high-temperature resistant resin, and fillers. The high-temperature resistant resin is polyphenylene sulfide, polyetherketone, or polyimide, which provides good wear resistance. The fillers are graphite, polytetrafluoroethylene, or molybdenum disulfide, which can provide lubrication. However, both graphite and molybdenum disulfide have problems with easy agglomeration and poor dispersibility, which may lead to the material's lubrication performance not achieving the desired effect.

[0005] Therefore, there is an urgent need in the market for a thermoplastic wear-resistant composite material with low friction and high toughness. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention uses polytetrafluoroethylene and polyphenylene sulfide as the main components, and adds modified aramid fiber and modified molybdenum disulfide to synthesize a thermoplastic wear-resistant composite material with good wear resistance, low friction and high toughness.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a thermoplastic wear-resistant composite material, which, by weight, comprises the following raw materials: 65-75 parts of polytetrafluoroethylene, 25-35 parts of polyphenylene sulfide, 3-7 parts of modified aramid fiber, and 1-5 parts of modified molybdenum disulfide.

[0009] In some embodiments of the present invention, the polyphenylene sulfide has a particle size of 550-650 mesh.

[0010] Preferably, the polyphenylene sulfide has a particle size of 600 mesh.

[0011] The applicant selected polyphenylene sulfide of this particle size because it has excellent mechanical properties, thermal stability, and good processing performance.

[0012] In some embodiments of the present invention, the method for preparing the modified aramid fiber includes the following steps:

[0013] (1) Mix γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, anhydrous ethanol, and deionized water, adjust the pH to 5-6, heat to 55-65℃, stir for 3.5-4.5h, and dry to obtain product 1 for later use.

[0014] (2) Mix fuming nitric acid, concentrated sulfuric acid, acetic anhydride and glacial acetic acid, stir to obtain solution 1 for later use. Add potassium dihydrogen phosphate, dipotassium hydrogen phosphate and sodium borohydride to tetrahydrofuran, stir to obtain solution 2 for later use. Soak aramid fiber in acetone, petroleum ether and deionized water in sequence, heat to reflux, filter, vacuum dry and add to solution 1. Stir at 5-15℃ for 5-7h, filter, wash, dry and add to solution 2. Stir for 23-25h, filter, wash, dry to obtain product 2 for later use.

[0015] (3) Add sodium hydroxide aqueous solution to product 1 from step (1), stir, add product 2 from step (2), stir at 55-65℃ for 3.5-4.5h, filter, wash, dry, and obtain product 3 for later use.

[0016] (4) Add dopamine hydrochloride to deionized water, stir, add sodium hydroxide aqueous solution, add graphene oxide, stir at 20-40℃ for 14-16h, add product 3 from step (3), shake for 9-11h, filter, wash, and dry to obtain modified aramid fiber.

[0017] In step (1), the mass ratio of γ-glycidyl etheroxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, anhydrous ethanol and deionized water is 1:(1-1.1):(2-2.5):(1-1.05).

[0018] In step (2), the ratio of aramid fiber to fuming nitric acid is 1g:(1-1.5)ml.

[0019] In some embodiments of the present invention, in step (3), the mass ratio of product 2 to product 1 is 1:(3.5-4.5).

[0020] Preferably, in step (3), the mass ratio of product 2 to product 1 is 1:4.

[0021] In some embodiments of the present invention, in step (4), the mass ratio of product 3 to graphene oxide is 1:(0.01-0.03).

[0022] Preferably, in step (4), the mass ratio of product 3 to graphene oxide is 1:0.02.

[0023] Aramid fibers possess excellent toughness and strength due to their unique molecular structure, enabling them to function as toughening materials in plastic systems. However, they also have two inherent drawbacks: low surface activity and poor UV resistance, which severely limit their application.

[0024] On one hand, the applicant first used γ-glycidoxypropyltrimethoxysilane and γ-methacryloyloxypropyltrimethoxysilane as raw materials and controlled their mass ratio to prepare a hyperbranched polysiloxane (product 1) by hydrolysis in anhydrous ethanol and deionized water. Then, aramid fibers were modified with a solution composed of fuming nitric acid, concentrated sulfuric acid, acetic anhydride, glacial acetic acid, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium borohydride, and tetrahydrofuran to introduce amino groups onto the surface of the aramid fibers (product 2). Furthermore, the hyperbranched polysiloxane was grafted onto the surface of the aramid fibers, introducing a large number of active functional groups onto the surface of the aramid fibers, improving surface adhesion, and thus improving the aramid fiber structure. The low surface activity of the fibers is addressed, and the grafting of the hyperbranched structure effectively resists the damage of ultraviolet rays to aramid fibers, thus improving the UV resistance of aramid fibers to a certain extent. On the other hand, the applicant introduces graphene oxide to further graft and modify the above-mentioned modified aramid fibers. The abundant oxygen-containing functional groups on the surface of graphene oxide give it good UV protection properties, and its unique chemical structure gives it good toughness, thereby significantly improving the UV protection and toughness of the modified aramid fibers. In addition, the carboxyl groups on the surface of graphene oxide and the residual amino groups on the surface of aramid fibers may generate certain hydrogen bonding interactions, thereby improving the stability and durability of the modified aramid fibers.

[0025] In some embodiments of the present invention, the method for preparing the modified molybdenum disulfide includes the following steps:

[0026] 1) Add molybdenum disulfide and sodium tartrate to an aqueous solution of N-methylpyrrolidone, sonicate, centrifuge, remove the supernatant, repeat the above operation, centrifuge, take the precipitate, wash, dry, and obtain the intermediate product for later use.

[0027] 2) Add maleic anhydride to deionized water, stir, and set aside the solution. Add the intermediate product from step 1) to anhydrous ethanol, sonicate, reflux, add the solution, stir, filter, wash, dry, and pulverize to obtain modified molybdenum disulfide.

[0028] In some embodiments of the present invention, in step 1), the mass ratio of molybdenum disulfide to sodium tartrate is 1:(0.1-0.2).

[0029] Preferably, in step 1), the mass ratio of molybdenum disulfide to sodium tartrate is 1:0.16.

[0030] In some embodiments of the present invention, in step 2), the mass ratio of the intermediate product to maleic anhydride is 1:(0.3-0.5).

[0031] Preferably, in step 2), the mass ratio of the intermediate product to maleic anhydride is 1:0.4.

[0032] Molybdenum disulfide has good lubricating properties, and its addition to wear-resistant composite materials can effectively reduce friction and improve the service life of wear-resistant composite materials. However, molybdenum disulfide has problems such as easy agglomeration and poor dispersibility, which can lead to its lubricating performance not being fully utilized.

[0033] The applicant used N-methylpyrrolidone aqueous solution as a dispersant and added sodium tartrate as an intercalation compound to exfoliate molybdenum disulfide to prepare molybdenum disulfide nanosheets with few layers (intermediate product). This weakened the van der Waals forces between the molybdenum disulfide layers and increased the specific surface area, thereby improving the lubrication and dispersibility of molybdenum disulfide. Furthermore, the applicant introduced maleic anhydride to modify the above-mentioned few-layer molybdenum disulfide nanosheets. The carboxyl groups in the hydrolysis product of maleic anhydride formed hydrogen bonds with the hydroxyl groups on the surface of molybdenum disulfide, and directionally coated the molybdenum disulfide particles, improving the oleophilic and hydrophobic properties of molybdenum disulfide, thereby effectively improving the dispersibility of molybdenum disulfide in polytetrafluoroethylene resin systems.

[0034] In another aspect, the present invention provides a method for preparing the thermoplastic wear-resistant composite material described above, comprising the following steps:

[0035] Polytetrafluoroethylene, polyphenylene sulfide, modified aramid fiber and modified molybdenum disulfide are mixed, stirred and molded at 350-380℃ to obtain thermoplastic wear-resistant composite material.

[0036] In another aspect, the present invention provides the application of the thermoplastic wear-resistant composite material described above, which is applied to wear-resistant components such as pump bodies and bearings.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) This invention uses polytetrafluoroethylene and polyphenylene sulfide as the main components, and adds modified aramid fiber and modified molybdenum disulfide to synthesize a thermoplastic wear-resistant composite material. Through the synergistic effect between the components, the thermoplastic wear-resistant composite material has the characteristics of low friction and high toughness.

[0039] (2) The present invention uses γ-glycidyl etheroxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane as raw materials to prepare a hyperbranched polysiloxane to modify aminated aramid fibers, and then introduces graphene oxide for modification, so that the surface activity and UV resistance of aramid fibers are improved, thereby effectively improving the toughness of thermoplastic wear-resistant composite materials.

[0040] (3) In this invention, N-methylpyrrolidone aqueous solution is used as a dispersant, and sodium tartrate is added as an intercalation compound to exfoliate molybdenum disulfide to prepare molybdenum disulfide nanosheets with fewer layers. Then, maleic anhydride is introduced for modification, which effectively improves the dispersibility of molybdenum disulfide, thereby giving the thermoplastic wear-resistant composite material good low friction.

[0041] (4) The composite material prepared by the present invention has the characteristics of good wear resistance, low friction and high toughness, and can be widely used in pump body, bearing and related wear-resistant parts, and has good commercial application value. Detailed Implementation

[0042] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0043] In the following examples and comparative examples, except for the modified aramid fiber and the modified molybdenum disulfide, all other compound monomers and related reagents used were commercially available. Among them, the polytetrafluoroethylene was model M111 and was purchased from Guangzhou Jingchen Plastics Co., Ltd.; the polyphenylene sulfide had a particle size of 600 mesh and was purchased from Shanghai Beishengyang International Trade Co., Ltd.; and the aramid fiber was purchased from Jiangxi Shuobang New Material Technology Co., Ltd.

[0044] Preparation Example 1

[0045] The method for synthesizing modified aramid fiber A includes the following steps:

[0046] (1) Mix 24g of γ-glycidoxypropyltrimethoxysilane, 25g of γ-methacryloxypropyltrimethoxysilane, 53g of anhydrous ethanol and 24.5g of deionized water, add 37wt% hydrochloric acid aqueous solution to adjust pH=5.5, heat to 60℃, stir for 4h, and dry under vacuum at 60℃ for 4h to obtain product 1 for later use;

[0047] (2) Mix 20ml of 98wt% fuming nitric acid, 1ml of 98wt% concentrated sulfuric acid, 185ml of acetic anhydride and 50ml of glacial acetic acid, stir for 30min to obtain solution 1 for later use. Add 6g of potassium dihydrogen phosphate, 18g of dipotassium hydrogen phosphate and 27.5g of sodium borohydride to 200ml of tetrahydrofuran, stir for 30min to obtain solution 2 for later use. Soak 15g of aramid fiber in 100ml of acetone, 100ml of petroleum ether and 200ml of deionized water for 5min, heat under reflux at 40℃ for 4h, filter, vacuum dry at 80℃ for 12h, add to solution 1, stir at 10℃ for 6h, filter, wash with deionized water, vacuum dry at 80℃ for 12h, add to solution 2, stir for 24h, filter, wash with deionized water, vacuum dry at 80℃ for 12h to obtain product 2 for later use.

[0048] (3) Add 10wt% sodium hydroxide aqueous solution to 20g of product 1 from step (1) to adjust pH=9, stir for 15min, add 5g of product 2 from step (2), stir at 60℃ for 4h, filter, wash three times with anhydrous ethanol and deionized water, and vacuum dry at 80℃ for 12h to obtain product 3 for later use.

[0049] (4) Add 2g of dopamine hydrochloride to 300ml of deionized water, stir for 20min, add 0.5mol / L sodium hydroxide aqueous solution to adjust pH=8, add 0.1g of graphene oxide, stir at 30℃ for 15h, add 5g of product 3 from step (3), shake for 10h, filter, wash 3 times with deionized water, and vacuum dry at 40℃ for 12h to obtain modified aramid fiber A.

[0050] Preparation Example 2

[0051] Modified aramid fiber B is implemented in the same way as modified aramid fiber A, except that the mass of γ-methacryloyloxypropyltrimethoxysilane in step (1) is replaced with 23g.

[0052] Preparation Example 3

[0053] Modified aramid fiber C is implemented in the same way as modified aramid fiber A, except that the mass of product 1 in step (3) is replaced with 16.5g.

[0054] Preparation Example 4

[0055] Modified aramid fiber D is implemented in the same way as modified aramid fiber A, except that the mass of graphene oxide in step (4) is replaced with 0.03g.

[0056] Preparation Example 5

[0057] The method for synthesizing modified molybdenum disulfide A includes the following steps:

[0058] 1) Add 5g of molybdenum disulfide and 0.8g of sodium tartrate to 100ml of 80wt% N-methylpyrrolidone aqueous solution, sonicate for 30min, centrifuge, remove the supernatant, repeat the above operation 3 times, centrifuge, take the precipitate, wash 3 times with isopropanol, and vacuum dry at 60℃ for 24h to obtain the intermediate product for later use.

[0059] 2) Add 2g of maleic anhydride to 50ml of deionized water and stir for 30min to obtain a solution for later use. Add 5g of the intermediate product from step 1) to 60ml of anhydrous ethanol, sonicate for 30min, reflux for 1h, add the solution, stir for 2h, filter, wash 3 times with anhydrous ethanol, vacuum dry at 60℃ for 24h, and pulverize to obtain modified molybdenum disulfide A.

[0060] Preparation Example 6

[0061] Modified molybdenum disulfide B is implemented in the same way as modified molybdenum disulfide A, except that the mass of sodium tartrate in step 1) is replaced with 0.3g.

[0062] Preparation Example 7

[0063] Modified molybdenum disulfide C is implemented in the same way as modified molybdenum disulfide A, except that the mass of maleic anhydride in step 2) is replaced with 1.2g.

[0064] Example 1

[0065] A thermoplastic wear-resistant composite material, by weight, comprises the following raw materials: 70 parts polytetrafluoroethylene, 30 parts polyphenylene sulfide, 5 parts modified aramid fiber A, and 3 parts modified molybdenum disulfide A.

[0066] The preparation method of the thermoplastic wear-resistant composite material in this embodiment includes the following steps:

[0067] Polytetrafluoroethylene, polyphenylene sulfide, modified aramid fiber A and modified molybdenum disulfide A are mixed and stirred at 1000 rpm for 2 hours. The mixture is then molded at 360°C to obtain a thermoplastic wear-resistant composite material.

[0068] Example 2

[0069] A thermoplastic wear-resistant composite material, by weight, comprises the following raw materials: 65 parts polytetrafluoroethylene, 25 parts polyphenylene sulfide, 5 parts modified aramid fiber A, and 1 part modified molybdenum disulfide A.

[0070] The preparation method of the thermoplastic wear-resistant composite material in this embodiment includes the following steps:

[0071] Polytetrafluoroethylene, polyphenylene sulfide, modified aramid fiber A and modified molybdenum disulfide A are mixed and stirred at 1000 rpm for 2 hours. The mixture is then molded at 350℃ to obtain a thermoplastic wear-resistant composite material.

[0072] Example 3

[0073] A thermoplastic wear-resistant composite material, by weight, comprises the following raw materials: 75 parts polytetrafluoroethylene, 35 parts polyphenylene sulfide, 5 parts modified aramid fiber A, and 5 parts modified molybdenum disulfide A.

[0074] The preparation method of the thermoplastic wear-resistant composite material in this embodiment includes the following steps:

[0075] Polytetrafluoroethylene, polyphenylene sulfide, modified aramid fiber A and modified molybdenum disulfide A are mixed and stirred at 1000 rpm for 2 hours. The mixture is then molded at 380℃ to obtain a thermoplastic wear-resistant composite material.

[0076] Example 4

[0077] A thermoplastic wear-resistant composite material, by weight, comprises the following raw materials: 67 parts polytetrafluoroethylene, 27 parts polyphenylene sulfide, 3 parts modified aramid fiber A, and 3 parts modified molybdenum disulfide A.

[0078] The preparation method of the thermoplastic wear-resistant composite material in this embodiment is the same as that in Embodiment 1.

[0079] Example 5

[0080] A thermoplastic wear-resistant composite material, by weight, comprises the following raw materials: 72 parts polytetrafluoroethylene, 32 parts polyphenylene sulfide, 7 parts modified aramid fiber A, and 3 parts modified molybdenum disulfide A.

[0081] The preparation method of the thermoplastic wear-resistant composite material in this embodiment is the same as that in Embodiment 1.

[0082] Example 6

[0083] This embodiment provides a thermoplastic wear-resistant composite material and its preparation method. The specific implementation method is the same as that in Embodiment 1, except that modified aramid fiber A is replaced by modified aramid fiber B in an equal amount.

[0084] Example 7

[0085] This embodiment provides a thermoplastic wear-resistant composite material and its preparation method. The specific implementation method is the same as that in Embodiment 1, except that modified aramid fiber A is replaced by modified aramid fiber C in an equal amount.

[0086] Example 8

[0087] This embodiment provides a thermoplastic wear-resistant composite material and its preparation method. The specific implementation method is the same as that in Embodiment 1, except that modified aramid fiber A is replaced by modified aramid fiber D in an equal amount.

[0088] Example 9

[0089] This embodiment provides a thermoplastic wear-resistant composite material and its preparation method. The specific implementation method is the same as that in Embodiment 1, except that modified molybdenum disulfide A is replaced by an equal amount of modified molybdenum disulfide B.

[0090] Example 10

[0091] This embodiment provides a thermoplastic wear-resistant composite material and its preparation method. The specific implementation method is the same as that in Embodiment 1, except that modified molybdenum disulfide A is replaced by an equal amount of modified molybdenum disulfide C.

[0092] Comparative Example 1

[0093] This comparative example provides a thermoplastic wear-resistant composite material and its preparation method. The specific implementation method is the same as in Example 1, except that aramid fiber is used instead of modified aramid fiber A.

[0094] Comparative Example 2

[0095] This comparative example provides a thermoplastic wear-resistant composite material and its preparation method. The specific implementation method is the same as in Example 1, except that molybdenum disulfide is used instead of modified molybdenum disulfide A.

[0096] Performance testing

[0097] The friction properties and toughness of the thermoplastic wear-resistant composite materials of Examples 1-10 and Comparative Examples 1-2 were tested, and the test results are shown in Table 1.

[0098] (1) Friction properties

[0099] The friction coefficients of the thermoplastic wear-resistant composite materials prepared in the examples and comparative examples were tested, with reference to standard GB / T 17754-2012.

[0100] (2) Toughness

[0101] The elongation at break of the thermoplastic wear-resistant composite materials prepared in the examples and comparative examples was tested according to standard GB / T 1040.2-2006, with a test temperature of 23℃ and a speed of 20mm / min.

[0102] Table 1

[0103] Group coefficient of friction Elongation at break (%) Example 1 0.09 210.8 Example 2 0.12 209.7 Example 3 0.11 210.3 Example 4 0.12 210.0 Example 5 0.11 210.2 Example 6 0.13 185.2 Example 7 0.14 185.0 Example 8 0.14 183.7 Example 9 0.16 205.4 Example 10 0.17 204.8 Comparative Example 1 0.16 174.6 Comparative Example 2 0.20 198.5

[0104] As shown in Table 1, the thermoplastic wear-resistant composite materials in Examples 1-5 of this invention exhibit low friction performance and high toughness. Examples 6-8 altered the proportions of key components during the synthesis of modified aramid fibers, failing to adequately improve the surface activity and UV resistance of the modified aramid fibers, thus affecting their toughness and leading to a significant decrease in the elongation at break of the composite material, i.e., a decrease in toughness, but with little impact on friction performance. Examples 9-10 altered the addition ratio of sodium tartrate and maleic anhydride in the modified molybdenum disulfide, reducing the dispersibility of the modified molybdenum disulfide and preventing it from providing adequate lubrication to the composite material, resulting in an increased coefficient of friction, but with little impact on toughness. Comparative Examples 1-2 involved replacing modified aramid fiber A and modified molybdenum disulfide A with equal amounts of aramid fiber and molybdenum disulfide, respectively. Tests revealed that Comparative Example 1 exhibited poor toughness, and Comparative Example 2 exhibited poor friction performance.

[0105] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A thermoplastic wear-resistant composite material, characterized in that, By weight, the thermoplastic wear-resistant composite material comprises the following raw materials: 65-75 parts of polytetrafluoroethylene, 25-35 parts of polyphenylene sulfide, 3-7 parts of modified aramid fiber, and 1-5 parts of modified molybdenum disulfide. The method for preparing the modified aramid fiber includes the following steps: (1) Mix γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, anhydrous ethanol, and deionized water, adjust the pH to 5-6, heat to 55-65℃, stir for 3.5-4.5h, and dry to obtain product 1 for later use. (2) Mix fuming nitric acid, concentrated sulfuric acid, acetic anhydride and glacial acetic acid, stir to obtain solution 1 for later use. Add potassium dihydrogen phosphate, dipotassium hydrogen phosphate and sodium borohydride to tetrahydrofuran, stir to obtain solution 2 for later use. Soak aramid fiber in acetone, petroleum ether and deionized water in sequence, heat to reflux, filter, vacuum dry and add to solution 1. Stir at 5-15℃ for 5-7h, filter, wash, dry and add to solution 2. Stir for 23-25h, filter, wash and dry to obtain product 2 for later use. (3) Add sodium hydroxide aqueous solution to product 1 from step (1), stir, add product 2 from step (2), stir at 55-65℃ for 3.5-4.5h, filter, wash, dry, and obtain product 3 for later use; (4) Add dopamine hydrochloride to deionized water, stir, add sodium hydroxide aqueous solution, add graphene oxide, stir at 20-40℃ for 14-16h, add product 3 from step (3), shake for 9-11h, filter, wash, and dry to obtain modified aramid fiber. The method for preparing the modified molybdenum disulfide includes the following steps: 1) Add molybdenum disulfide and sodium tartrate to an aqueous solution of N-methylpyrrolidone, sonicate, centrifuge, remove the supernatant, repeat the above operation, centrifuge, take the precipitate, wash, dry, and obtain the intermediate product for later use. 2) Add maleic anhydride to deionized water, stir, and set aside the solution. Add the intermediate product from step 1) to anhydrous ethanol, sonicate, reflux, add the solution, stir, filter, wash, dry, and pulverize to obtain modified molybdenum disulfide.

2. The thermoplastic wear-resistant composite material according to claim 1, characterized in that, The polyphenylene sulfide has a particle size of 550-650 mesh.

3. The thermoplastic wear-resistant composite material according to claim 1, characterized in that, In step (3), the mass ratio of product 2 to product 1 is 1:(3.5-4.5).

4. The thermoplastic wear-resistant composite material according to claim 1, characterized in that, In step (4), the mass ratio of product 3 to graphene oxide is 1:(0.01-0.03).

5. The thermoplastic wear-resistant composite material according to claim 1, characterized in that, In step 1), the mass ratio of molybdenum disulfide to sodium tartrate is 1:(0.1-0.2).

6. The thermoplastic wear-resistant composite material according to claim 1, characterized in that, In step 2), the mass ratio of the intermediate product to maleic anhydride is 1:(0.3-0.5).

7. A method for preparing a thermoplastic wear-resistant composite material according to any one of claims 1-6, characterized in that, Includes the following steps: Polytetrafluoroethylene, polyphenylene sulfide, modified aramid fiber and modified molybdenum disulfide are mixed, stirred and molded at 350-380℃ to obtain thermoplastic wear-resistant composite material.

8. The application of a thermoplastic wear-resistant composite material according to any one of claims 1-6, characterized in that, It is used in wear-resistant components such as pump bodies and bearings.