Low-friction high-wear-resistance resin-based composite material, and preparation method and use thereof

Abstract

The application provides a low-friction high-wear-resistance resin-based composite material and a preparation method and application thereof, and belongs to the field of composite materials. The polytetrafluoroethylene nano powder modified by radiation is used together with inorganic filler particles such as graphite nano powder, molybdenum disulfide nano powder and the like to prepare a polyphenylene sulfide-based composite material at a certain compounding ratio. The composite material shows excellent tribological properties. On this basis, by adding a chopped carbon fiber and the like as a reinforcing filler, a high-strength, low-friction high-wear-resistance polyphenylene sulfide-based composite material is prepared by using a multi-scale functional filler network structure constructed inside the composite material. The technical process route of the application is simple, and the manufacturing cost is low. The application can be used for preparing friction protection parts, low-friction wear-resistant structures, wear-resistant bearings, self-lubricating parts, mechanical gaskets and the like under dry friction, and has a very broad application prospect in the fields of aerospace, transportation, electronic devices and high-end mechanical equipment.

Description

Technical Field

[0001] This invention belongs to the field of composite materials, specifically relating to a low-friction, high-wear-resistant resin-based composite material, its preparation method, and its applications. Background Technology

[0002] In recent years, resin-based composite materials have attracted attention due to their advantages such as low cost, lightweight, and ease of processing and molding, and have been widely used in aerospace, transportation, military equipment, biomedicine, and electronic information fields. However, in practical applications, continuous interactions often occur between materials. To avoid safety accidents and economic losses caused by severe friction and wear between materials, the development of resin-based composite materials with excellent tribological properties has become a focus for researchers and material manufacturers. In particular, aerospace vehicles (such as aircraft, rockets, and satellites) often face heavy-load, high-speed friction environments in their structures, mechanisms, and control system components under conditions of high-speed flight, high-speed launch, and maneuvering. This not only affects the wear and service life of components but also leads to functional degradation or even failure. Therefore, achieving friction protection under high-speed, heavy-load conditions is a key factor in ensuring the efficient, stable, and safe operation of the system.

[0003] Specialty engineering plastics (such as polyphenylene sulfide, polyetheretherketone, and polyimide) have gained widespread attention due to their excellent mechanical properties, chemical resistance, and thermal stability, becoming the most promising polymer materials in the field of tribology. With the development of advanced technologies, people have placed more stringent demands on the tribological properties of resin-based composite materials. In the past, numerous scholars both domestically and internationally have conducted extensive research, exploring various methods to prepare resin-based composite materials that can meet higher tribological performance requirements.

[0004] For example, patent application CN116925547A discloses a low-friction coefficient polyphenylene sulfide (PPS) material and its preparation method. This invention forms a composite phase interface by microscopically coating the surface of PPS powder particles with polymeric gel or polymer-inorganic hybrid gel, and then melt-compositing it with reinforcing agents, lubricants, and dispersants at high temperature to form an interface that is more conducive to reducing friction. However, its preparation process is cumbersome, and the material has poor mechanical properties, making it difficult to apply under harsh conditions such as high speed and heavy load. Patent application CN115785671A discloses an aerogel / PPS self-lubricating friction material and its preparation method. This invention uses aerogel, reinforcing fibers, and liquid phase additives to mix and fill PPS for modification, but its low thermal conductivity makes the improvement in friction and wear performance less than ideal. Patent application CN112094499A discloses a high thermal conductivity, low friction coefficient polyphenylene sulfide / boron nitride (PPS / BN) composite material and its preparation method. This invention constructs an isolation network structure within the material by tightly and uniformly coating BN microflakes onto the surface of PPS particles, creating a three-dimensional thermally conductive network structure to reduce heat accumulation during friction. However, its improvement on self-lubricating performance is limited (the lowest friction coefficient is 0.180). Therefore, developing a low-friction, high-wear-resistant resin-based composite material that meets higher friction and wear performance requirements and possesses both excellent mechanical strength and high thermal conductivity has significant scientific value and application prospects. Summary of the Invention

[0005] The purpose of this invention is to provide a low-friction, high-wear-resistant resin-based composite material, its preparation method, and its applications.

[0006] This invention provides a low-friction, high-wear-resistant resin-based composite material, which is prepared from the following raw materials in parts by weight: 10-200 parts of resin matrix, 5-80 parts of solid lubricant, and 0-60 parts of reinforcing agent; wherein the solid lubricant is a mixture of polytetrafluoroethylene or its derivatives with carbon materials or a mixture of polytetrafluoroethylene or its derivatives with metal derivatives.

[0007] Furthermore, it is prepared from the following raw materials in parts by weight: 10-200 parts of resin matrix, 5-40 parts of polytetrafluoroethylene derivatives, 5-30 parts of carbon material, and 0-60 parts of reinforcing agent.

[0008] Alternatively, it may be prepared from the following raw materials in parts by weight: 10-200 parts resin matrix, 5-40 parts polytetrafluoroethylene derivatives, 5-30 parts metal derivatives, and 0-60 parts reinforcing agent.

[0009] Furthermore, the resin matrix is ​​a thermoplastic resin;

[0010] The reinforcing agent is glass fiber, aramid fiber, basalt fiber, or carbon fiber.

[0011] Furthermore, the resin matrix is ​​polyoxymethylene, polyamide, polysulfone, polyphenylene sulfide, polyetheretherketone, or polyimide;

[0012] The derivative of the polytetrafluoroethylene is irradiated modified polytetrafluoroethylene, preferably irradiated modified polytetrafluoroethylene nanopowder;

[0013] The carbon material is graphite, preferably graphite nanopowder;

[0014] The metal derivative is one or a mixture of two or more of metal sulfides, metal oxides, metal nitrides, and metal carbides, preferably molybdenum disulfide, and more preferably molybdenum disulfide nanopowder.

[0015] The reinforcing agent is short-cut carbon fiber.

[0016] Furthermore, the low-friction, high-wear-resistant resin-based composite material is prepared from the following raw materials in parts by weight: 50-75 parts resin matrix, 10-30 parts polytetrafluoroethylene derivatives, 10-30 parts carbon materials, and 0-20 parts chopped carbon fibers.

[0017] Alternatively, the low-friction, high-wear-resistant resin-based composite material is prepared from the following raw materials in parts by weight: 50-75 parts resin matrix, 10-30 parts polytetrafluoroethylene derivatives, 10-30 parts metal derivatives, and 0-20 parts chopped carbon fibers.

[0018] Furthermore, the low-friction, high-wear-resistant resin-based composite material is prepared from the following raw materials in parts by weight: 70 parts resin matrix, 10-20 parts polytetrafluoroethylene derivatives, and 10-20 parts carbon materials.

[0019] Alternatively, the low-friction, high-wear-resistant resin-based composite material is prepared from the following raw materials in parts by weight: 70 parts resin matrix, 10-20 parts polytetrafluoroethylene derivatives, and 10-20 parts metal derivatives.

[0020] This invention also provides a method for preparing the above-mentioned low-friction, high-wear-resistant resin-based composite material. The method includes the following steps: drying and mixing the raw materials, plasticizing, and drying again to obtain the low-friction, high-wear-resistant resin-based composite material. Further, the drying temperature is 60–100°C, and the drying time is 8–16 hours; the plasticizing processing temperature is 200°C–350°C; preferably, the drying temperature is 80°C, the drying time is 12 hours, and the plasticizing processing temperature is 280°C–300°C.

[0021] The present invention also provides the use of the above-mentioned low-friction, high-wear-resistant resin-based composite materials in aerospace, transportation, electronic devices, and mechanical equipment.

[0022] Furthermore, the composite material is used to manufacture friction protection components, low-friction wear-resistant structures, wear-resistant bearings, self-lubricating bearings, and mechanical gaskets.

[0023] Experiments show that this invention utilizes radiation-modified polytetrafluoroethylene (PTFE) nanoparticles and inorganic filler particles such as graphite nanoparticles and molybdenum disulfide nanoparticles in a specific blending ratio to prepare a polyphenylene sulfide (PPS)-based composite material. This composite material exhibits excellent tribological properties. Furthermore, by adding reinforcing fillers such as chopped carbon fibers and utilizing the multi-scale functional filler network structure constructed within the composite material, a high-strength, low-friction, and high-wear-resistant PPS-based composite material is achieved. This invention features a simple process and low manufacturing cost, and can be used to prepare friction protection components for dry friction, low-friction wear-resistant structures, wear-resistant bearings, self-lubricating parts, mechanical gaskets, and other components. It has very broad application prospects in aerospace, transportation, electronic devices, and high-end mechanical equipment.

[0024] Obviously, based on the above description of the present invention, and according to common technical knowledge and conventional methods in the field, various other modifications, substitutions or alterations can be made without departing from the basic technical concept of the present invention.

[0025] The following detailed embodiments further illustrate the above-described content of the present invention. However, this should not be construed as limiting the scope of the present invention to the following embodiments. All technologies implemented based on the above-described content of the present invention fall within the scope of the present invention. Attached Figure Description

[0026] Figure 1 FTIR spectral data of untreated PTFE, i-PTFE, pure PPS and PPS / i-PTFE30 composite material (A) and morphological schematic diagram of untreated PTFE and i-PTFE powder (B).

[0027] Figure 2 The graph shows the tribological properties of the PPS-based composite system.

[0028] Figure 3 Schematic diagrams of the quenched fracture surface morphology of pure PPS (A), PPS / i-PTFE (B), and PPS / m-PTFE (C).

[0029] Figure 4 This is a graph showing the tensile strength data of the PPS-based composite system.

[0030] Figure 5Schematic diagram of the brittle fracture morphology of PPS-based composite materials filled with different solid lubricants.

[0031] Figure 6 Mechanical property data of PPS-based composite materials filled with different solid lubricants.

[0032] Figure 7 Graphs showing the instantaneous friction coefficient, average friction coefficient, and specific wear rate of PPS-based composite materials filled with different solid lubricants.

[0033] Figure 8 Schematic diagrams and 3D contour images of the wear surface morphology of PPS-based composite materials filled with different solid lubricants.

[0034] Figure 9 Instantaneous frictional temperature and thermal conductivity data of PPS-based composites filled with different solid lubricants.

[0035] Figure 10 A schematic diagram of EDS elemental analysis of PPS-based composite materials filled with different solid lubricants.

[0036] Figure 11 XPS analysis data of PPS-based composites filled with different solid lubricants.

[0037] Figure 12 This is a graph showing the mechanical properties of PPS-based composite materials after the addition of carbon fibers.

[0038] Figure 13 Figure 1 shows the tribological properties of PPS-based composites after the addition of carbon fibers.

[0039] Figure 14 The instantaneous frictional temperature and thermal conductivity of PPS-based composite materials after the addition of carbon fibers. Detailed Implementation

[0040] The raw materials used in this invention are as follows:

[0041] Polyphenylene sulfide (PPS) was purchased from Deyang Keji High-Tech Materials Co., Ltd., product model KJ504; irradiated modified polytetrafluoroethylene nanopowder (i-PTFE, average particle size 200-300nm) was purchased from Sichuan Jinhe Polymer Materials Co., Ltd., product model JH-305F; graphite (Gr, average particle size 500nm); molybdenum disulfide (MoS2, average particle size 500nm); and chopped carbon fiber (SCF, average length 3mm).

[0042] Example 1: Preparation of Gr-filled modified PPS-based composite material of the present invention

[0043] Before extrusion granulation, the raw materials are dried in a forced-air drying oven at 80℃ for 12 hours. The materials are mixed in a ratio of 70wt% PPS, 20wt% i-PTFE, and 10wt% Gr, and then melt-mixed in a co-rotating parallel twin-screw extruder at a processing temperature of 280℃-300℃. After uniform plasticization in the extruder, cooling and granulation are performed, followed by drying in a forced-air drying oven for 12 hours to obtain the Gr-filled modified PPS-based composite material (abbreviated as P / i-PTFE20 / Gr10).

[0044] Example 2: Preparation of Gr-filled modified PPS-based composite material of the present invention

[0045] Before extrusion granulation, the raw materials are dried in a forced-air drying oven at 80℃ for 12 hours. The materials are mixed in a ratio of 70wt% PPS, 20wt% i-PTFE, and 20wt% Gr, and then melt-mixed in a co-rotating parallel twin-screw extruder at a processing temperature of 280℃-300℃. After uniform plasticization in the extruder, cooling and granulation are performed, followed by drying in a forced-air drying oven for 12 hours to obtain the Gr-filled modified PPS-based composite material (abbreviated as P / i-PTFE20 / Gr20).

[0046] Example 3: Preparation of MoS2-filled modified PPS-based composite material of the present invention

[0047] The method is the same as in Example 1, except that the materials are weighed according to the ratio of 70wt% PPS, 20wt% i-PTFE and 10wt% MoS2, and processed using a co-rotating parallel twin-screw extruder at a temperature of 280℃-300℃ to obtain the MoS2-filled modified PPS-based composite material (abbreviated as P / i-PTFE20 / MoS210).

[0048] Example 4: Preparation of MoS2-filled modified PPS-based composite material of the present invention

[0049] The method is the same as in Example 1, except that the materials are weighed according to the ratio of 70wt% PPS, 20wt% i-PTFE and 20wt% MoS2, and processed using a co-rotating parallel twin-screw extruder at a temperature of 280℃-300℃ to obtain the MoS2-filled modified PPS-based composite material (abbreviated as P / i-PTFE20 / MoS220).

[0050] Example 5: Preparation of SCF and Gr-filled modified PPS-based composite material of the present invention

[0051] The method is the same as in Example 1, except that the materials are weighed according to the ratio of 56wt% PPS, 16wt% i-PTFE, 8wt% Gr and 20wt% SCF, and processed using a co-rotating parallel twin-screw extruder at a temperature of 280℃-300℃ to obtain SCF and Gr filled modified PPS-based composite material (abbreviated as P / i-PTFE / Gr / SCF).

[0052] Example 6: Preparation of SCF and MoS2-filled modified PPS-based composite material of the present invention

[0053] Referring to the method of Example 1, the only difference is that the materials are weighed according to the ratio of 56wt% PPS, 16wt% i-PTFE, 8wt% MoS2, and 20wt% SCF, and processed using a co-rotating parallel twin-screw extruder at a temperature of 280℃-300℃ to obtain an SCF and MoS2 filled modified PPS-based composite material (abbreviated as P / i-PTFE / MoS2 / SCF).

[0054] The following describes the preparation of control samples using control examples.

[0055] Comparative Example 1: Preparation of the unmodified PPS-based material of the present invention

[0056] Before extrusion granulation, the raw materials are dried in a forced-air drying oven at 80℃ for 12 hours. The materials are mixed according to a ratio of 100wt% PPS and then melt-mixed in a co-rotating parallel twin-screw extruder at a processing temperature of 280℃-300℃. After uniform plasticization in the extruder, cooling and granulation are performed, followed by drying in a forced-air drying oven for 12 hours to obtain unmodified PPS-based material (referred to as PPS).

[0057] Comparative Example 2: Preparation of i-PTFE modified PPS-based composite material of the present invention

[0058] Referring to the method of Comparative Example 1, the only difference is that the materials are weighed according to the ratio of 70wt% PPS and 30wt% i-PTFE, and processed using a co-rotating parallel twin-screw extruder at a temperature of 280℃-300℃ to obtain a PPS-based composite material modified only by i-PTFE (abbreviated as P / i-PTFE30).

[0059] Comparative Example 3: Preparation of Gr-modified PPS-based composite material of the present invention

[0060] Referring to the method of Comparative Example 1, the only difference is that the materials are weighed according to the ratio of 70wt% PPS and 30wt% Gr, and processed using a co-rotating parallel twin-screw extruder at a temperature of 280℃-300℃ to obtain a Gr-modified PPS-based composite material (abbreviated as P / Gr30).

[0061] Comparative Example 4: Preparation of MoS2-modified PPS-based composite material of the present invention

[0062] Referring to the method of Comparative Example 1, the only difference is that the materials are weighed according to the ratio of 70wt% PPS and 30wt% MoS2, and processed using a co-rotating parallel twin-screw extruder at a temperature of 280℃-300℃ to obtain a MoS2-modified PPS-based composite material (abbreviated as P / MoS230).

[0063] Table 1. Composition ratios and group numbers of PPS-based composite materials in Examples 1-6 and Comparative Examples 1-4.

[0064]

[0065] The following experimental examples demonstrate the beneficial effects of the present invention.

[0066] Experimental Example 1: Structural Characterization and Performance Testing of Irradiated Modified Polytetrafluoroethylene Nanopowder

[0067] (1) Structural characterization

[0068] Figure 1 A shows the FTIR spectra of untreated PTFE and i-PTFE powders, pure PPS, and PPS / i-PTFE20. At 2342 cm⁻¹... -1 The characteristic absorption peaks observed at 1227 and 1152 cm⁻¹ are attributed to the presence of the -CF₂ group, while those at 1227 and 1152 cm⁻¹ are attributed to the presence of the -CF₂ group. -1 The peaks at 634 and 502 cm⁻¹ are associated with the symmetric and antisymmetric stretching vibrations of the -CF₂ group, respectively. Furthermore, the peaks at 634 and 502 cm⁻¹ are also related to these vibrations. -1 The absorption peak at 994 cm⁻¹ belongs to the bending vibration of the -CF₂ group. -1 The absorption peak corresponds to the -CF3 group. The above results indicate that characteristic absorption peaks of PTFE were observed in both types of fillers. However, slight differences exist between the FTIR spectra of the two fillers. For example, at 3498 and 870 cm⁻¹... -1 The characteristic absorption peaks detected at 1796 cm⁻¹ are attributed to the stretching vibration and out-of-plane bending vibration of -OH, respectively. Furthermore, the peak at 1796 cm⁻¹... -1The absorption peaks are related to the stretching vibrations of C=O. When PTFE is irradiated under air conditions, functional groups such as -COF / -COOH are generated on the PTFE surface. In short, the irradiation energy generates a large number of fluorine-containing free radicals (-CF2·) by inducing PTFE chain scission. Then, O2 diffuses from the air and reacts with the fluorine-containing free radicals to generate -COF. Subsequently, under the action of H2O, -COF hydrolyzes to form -COOH groups. Therefore, it can be concluded that oxygen-containing groups, such as -OH and C=O, are introduced onto the surface of PTFE powder due to irradiation treatment. In addition, besides the characteristic absorption peaks of PPS, a -COOH absorption peak was also detected in the FTIR spectrum of PPS / i-PTFE20, indicating that the melt processing process has little effect on the surface properties of i-PTFE powder.

[0069] Figure 1 B shows the morphology of untreated PTFE and i-PTFE powders. After irradiation, the average particle size of the PTFE powder decreased from approximately 300 nm to about 200 nm. Furthermore, untreated PTFE exhibited more severe agglomeration compared to i-PTFE. Additionally, the fibrous structure observed in pristine untreated PTFE was absent in i-PTFE, primarily due to the degradation effect induced by irradiation.

[0070] (2) Performance Testing

[0071] Combined with the tribological properties of PPS-based composite systems ( Figure 2 ), quenched fracture surface morphology ( Figure 3 (A) Pure PPS; (B) PPS / i-PTFE; (C) PPS / m-PTFE and the tensile strength of PPS-based composite systems Figure 4 Data analysis shows that i-PTFE, after radiation treatment, can significantly improve the compatibility between the filler and the matrix, thereby optimizing the dispersion of the filler in the matrix. This is conducive to the formation of a high-quality lubrication transfer film during friction, resulting in better friction reduction and wear control, while effectively reducing the adverse effects of the filler on the mechanical properties of the composite material.

[0072] The experimental results above show that the surface polarity of irradiated modified polytetrafluoroethylene nanopowder is increased, thereby improving its interfacial bonding with the PPS matrix. Compared with unmodified polytetrafluoroethylene powder, it shows great advantages in improving the tribological and mechanical properties of composite materials.

[0073] Experimental Example 2: Performance Testing of Samples

[0074] According to the requirements of tribological tests and mechanical property test specimens, the samples obtained from Examples 1-6 and Comparative Examples 1-4 were injection molded on a servo injection molding machine. The temperatures of each zone of the injection molding machine were as follows: the temperature of the front section of the barrel was 220 - 320 °C, the temperature of the middle section of the barrel was 250 - 350 °C, and the temperature of the rear section of the barrel was 250 - 350 °C; the injection pressure was 120 MPa, and the injection speed was 35 - 45 g / s.

[0075] 1. Experimental methods

[0076] (1) Mechanical property tests: Dumbbell-shaped specimens were prepared according to GB / T 1040.2 - 2022 and their tensile properties were tested. The dimensions of the specimens were: 150×10×4 mm 3 , and the test rate was 10 mm / min; Cuboid specimens were prepared according to GB / T9341 - 2008 and their flexural properties were tested. The dimensions of the specimens were: 80×10×4 mm 3 , and the test rate was 2 mm / min.

[0077] (2) Friction and wear tests: According to the standard of GB / T 3960 - 2016, the tribological properties of the PPS-based composite materials were tested using an M-200 ring-block friction and wear testing machine. The sample size was: 30 mm * 7 mm * 6 mm. A titanium alloy ring was used as the friction pair, with an outer diameter of 40 mm and a surface roughness (Ra) of 0.7 - 0.9 μm. Before the test, the surface of the friction pair was polished with sandpaper and ultrasonically cleaned in acetone. The sliding speed was 0.42 m / s and the load was 200 N.

[0078] (3) The quenched cross-section, worn surface, and the surface morphology of the corresponding friction pair of the specimens were observed using a scanning electron microscope, and the elemental composition content and distribution of the quenched cross-section of the specimens and the surface of the corresponding friction pair were explored through the energy dispersive X-ray spectrometer配套 with the system. The chemical state and composition content of the elements on the worn surface of the specimens were explored using an X-ray photoelectron spectrometer, and the test voltage and current were 10 kV and 7 mA respectively. A 3D profilometer was used to characterize the wear marks of the specimens, observe the wear conditions of the specimens, and measure relevant profile parameters. A HANDPILX-D Shore hardness tester was used to test the Shore D hardness of the PPS composite materials according to GB / T2411 - 2008 under a maximum load of 50 N. The thermal conductivity of the specimens was measured using a Hot Disk thermal constant analyzer by the transient heat source method. The specimens were placed on the upper and lower surfaces of the thermal conductivity probe and compacted, and the thermal conductivity was calculated by measuring the temperature change of the specimens under the action of the heat source.

[0079] 2. Experimental results

[0080] (1) Test results of the performance of the composite materials without carbon fiber

[0081] As Figure 5 As shown, the internal structure of PPS composites filled with particulate filler (i-PTFE) and layered filler (Gr, MoS2) exhibits different micromorphologies depending on their content ratio. The former tends to agglomerate or form voids, while the latter undergoes tearing under external force, tending to form a morphology of tightly packed fillers.

[0082] like Figure 6 As shown, the addition of Gr and MoS2 can improve the bending and shear deformation resistance of PPS, but reduce the tensile strength of the composite material. The addition of i-PTFE particles also leads to a certain degree of weakening of the mechanical properties of PPS.

[0083] like Figure 7 As shown, i-PTFE particles alone can effectively improve the tribological properties of PPS, and Gr or MoS2 alone can also effectively improve the tribological properties of PPS. Further comparison revealed that, with all PPS at 70 wt%, P / i-PTFE20 / Gr10 and P / i-PTFE10 / Gr20 exhibited superior tribological properties compared to P / i-PTFE30 and P / Gr30, indicating that the co-filling of Gr and i-PTFE at a certain blending ratio produced a synergistic effect. Similarly, with all PPS at 70 wt%, P / i-PTFE20 / MoS210 and P / i-PTFE10 / MoS220 exhibited superior tribological properties compared to P / i-PTFE30 and P / MoS230, indicating that the co-filling of MoS2 and i-PTFE at a certain blending ratio produced a synergistic effect.

[0084] Further comparison of the tribological properties of P / i-PTFE20 / Gr10 and P / i-PTFE10 / Gr20 revealed that P / i-PTFE20 / Gr10 was superior, indicating a better synergistic effect between Gr and i-PTFE at this compound ratio. Similarly, comparison of the tribological properties of P / i-PTFE20 / MoS2 10 and P / i-PTFE10 / MoS2 20 showed that P / i-PTFE20 / MoS2 10 was superior, indicating a better synergistic effect between MoS2 and i-PTFE at this compound ratio.

[0085] like Figure 8As shown, pure PPS exhibits severe curling damage and large wear marks after wear. Furthermore, the individual addition of MoS2 or Gr causes PPS to experience severe wear. Key parameters of the wear marks in PPS-based composite materials (see Table 2) indicate that the addition of i-PTFE, with its excellent self-lubricating properties, significantly improves the tribological properties of PPS. However, due to the material's poor mechanical strength, significant wear still occurs. Further observation reveals that the P / i-PTFE20 / Gr10 and P / i-PTFE20 / MoS210 composites exhibit less wear and smoother wear surfaces. Both composites demonstrate excellent tribological modification effects, indicating that i-PTFE, when combined with Gr or MoS2 in certain proportions, produces a synergistic effect, thereby significantly improving the tribological properties of the composite material and enhancing its friction-reducing and wear-reducing performance.

[0086] Table 2. Key parameters of wear marks on PPS-based composite materials

[0087]

[0088] like Figure 9 As shown, severe friction and wear lead to the generation and accumulation of a large amount of frictional heat at the interface between the matrix and the contact surface. This, in turn, causes softening, deformation, and melting degradation of the polymer matrix, resulting in poor tribological properties of the material. The addition of Gr provides excellent thermal conductivity, while MoS2 has a smaller effect on thermal conductivity. However, both PPS / i-PTFE / Gr and PPS / i-PTFE / MoS2 exhibit low friction temperatures, indicating that the mechanisms by which the two fillers improve the tribological properties of PPS are not entirely the same.

[0089] like Figure 10 As shown, the formation of transfer films on the surface of the friction pair with different compositions produced varying degrees of improvement. These included PPS matrix, Gr, i-PTFE, and MoS2, as well as substances generated between them due to tribochemical reactions, which had a certain impact on the bonding between the metal friction pair and the transfer film. Among them, MoS2 exhibited better tribological properties with the metal friction pair.

[0090] Figure 11 The XPS full spectrum of the worn surfaces of the composite materials is shown. The results indicate that P / i-PTFE20 / Gr10 mainly functions as a self-lubricant through C and F-containing substances, without any specific tribochemical reactions occurring. In contrast, the P / i-PTFE20 / MoS2 10 composite material exhibits a Mo 3d energy dispersive spectral peak and has a higher S content and a lower F content, indicating that MoS2 plays an important role in reducing friction and wear. Both P / i-PTFE20 / Gr10 and P / i-PTFE20 / MoS2 10 demonstrate excellent tribological properties.

[0091] (2) Performance test results of carbon fiber composite materials

[0092] Further, respectively in PPS / i-PTFE20 / Gr10 (P / i-PTFE / Gr) and

[0093] The mechanical and tribological properties of the composite material were investigated by introducing reinforcing carbon fibers into PPS / i-PTFE20 / MoS210 (P / i-PTFE / MoS2).

[0094] Figure 12 This indicates that the mechanical properties of both P / i-PTFE / Gr and P / i-PTFE / MoS2 are significantly improved with the introduction of 20wt% carbon fiber.

[0095] Figure 13 This indicates that with the addition of 20 wt% carbon fiber, the coefficients of friction of both P / i-PTFE / Gr and P / i-PTFE / MoS2 are reduced to some extent.

[0096] Figure 14 The results show that with the addition of 20 wt% carbon fiber, P / i-PTFE / Gr exhibits a lower instantaneous friction temperature during friction. Combined with the high thermal conductivity of P / i-PTFE / Gr / SCF, P / i-PTFE / Gr / SCF demonstrates excellent tribological properties during friction. While P / i-PTFE / MoS2 shows improved thermal conductivity after carbon fiber filling, its instantaneous temperature during friction does not show a significant reduction.

[0097] The experimental results above show that radiation-modified polytetrafluoroethylene, when mixed with graphite, molybdenum disulfide, and carbon fiber in a certain ratio, can form a multi-scale functional filler network structure within the composite material, thereby enabling the composite material to exhibit optimal comprehensive performance and achieving the preparation of a high-strength, low-friction, and wear-resistant polyphenylene sulfide-based composite material.

[0098] In summary, this invention provides a low-friction, high-wear-resistant resin-based composite material and its preparation method. This invention uses radiation-modified polytetrafluoroethylene powder, graphite, and molybdenum disulfide in a specific blending ratio to prepare a polyphenylene sulfide-based composite material. This material exhibits excellent comprehensive properties. Furthermore, by adding carbon fiber as a reinforcing agent, a high-strength, low-friction, and wear-resistant polyphenylene sulfide-based composite material is simultaneously prepared. This invention features a simple process, low manufacturing cost, and promising application prospects.

Claims

1. A low-friction, high-wear-resistant resin-based composite material, characterized in that, It is made from the following raw materials in parts by weight: 70 parts polyphenylene sulfide, 20 parts irradiated modified polytetrafluoroethylene, 10 parts graphite, and 0-60 parts chopped carbon fiber. Alternatively, the low-friction, high-wear-resistant resin-based composite material is prepared from the following raw materials in parts by weight: 70 parts of polyphenylene sulfide, 20 parts of irradiated modified polytetrafluoroethylene, 10 parts of molybdenum disulfide, and 0-60 parts of chopped carbon fiber. The irradiated modified polytetrafluoroethylene is irradiated modified polytetrafluoroethylene nanopowder; The graphite is graphite nanopowder; The molybdenum disulfide is molybdenum disulfide nanoparticle powder.

2. A method for preparing the low-friction, high-wear-resistant resin-based composite material of claim 1, characterized in that, The method includes the following steps: drying the raw materials, mixing them, plasticizing them, and drying them again to obtain a low-friction, high-wear-resistant resin-based composite material.

3. The method according to claim 2, characterized in that, The drying temperature is 60~100℃, and the drying time is 8~16 hours; the plasticizing processing temperature is 200℃-350℃.

4. The method according to claim 3, characterized in that, The drying temperature is 80℃ and the time is 12 hours; the plasticizing processing temperature is 280℃-300℃.

5. The use of the low-friction, high-wear-resistant resin-based composite material of claim 1 in aerospace, transportation, electronic devices, and mechanical equipment.

6. The use according to claim 5, characterized in that, The composite material is used to manufacture friction protection components, low-friction wear-resistant structures, wear-resistant bearings, self-lubricating bearings, and mechanical pads.

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