Composite material with high wear resistance and high tracking resistance index as well as preparation method and application of composite material

Abstract

The invention relates to the technical field of composite materials, in particular to a high-wear-resistance high-tracking-index composite material as well as a preparation method and application thereof. The composite material takes polyphenylene sulfide as a matrix, and comprises the following components in percentage by weight: 8-32% of inorganic fiber; 4%-12% of a wear-resistant and tracking-resistant bifunctional agent; 0.1%-5% of an antioxidant; 0.1%-5% of an insulating lubricant; 0.1%-5% of other auxiliary agents; the balance is polyphenylene sulfide. According to the invention, the wear-resistant and tracking-resistant dual-functional agent is added into the polyphenylene sulfide matrix, so that the specific wear rate of the polyphenylene sulfide composite material is less than or equal to 5.8 * 10 <-3 >, and the CTI value reaches 200-250 V.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite materials, in particular to a high-wear-resistance and high-CTI composite material, a preparation method and application thereof. BACKGROUND

[0002] Polyphenylene sulfide (PPS) is a crystalline heat-resistant polymer formed by alternating benzene rings and sulfur atoms. Its molecular chain is regular, and the rigid sulfur bond connects the benzene ring to form a large pi bond, resulting in a stable structure. The regular crystal structure of PPS ensures excellent high-temperature resistance, radiation resistance, flame resistance, balanced mechanical properties, and excellent dimensional stability. At the same time, PPS has good adhesion with metal materials and non-metal materials, and can be blended with various polymer materials to prepare non-metallic alloys. Polyphenylene sulfide resin can also be processed by general thermoplastic plastic processing methods such as extrusion, injection molding, and pressing. Therefore, polyphenylene sulfide resin has a wide range of applications and good development prospects.

[0003] In new energy vehicles, PPS material is mainly used in copper bars. Through processing techniques such as injection molding and extrusion, PPS can be tightly wrapped around the copper bar to form a uniform protective layer. This processing method not only improves production efficiency but also reduces overall cost. The insulating properties of PPS plastic provide a protective barrier for the copper bar, protecting it from external environmental factors such as oxygen and moisture in the air. This protective effect can significantly delay the oxidation process of copper, thereby improving the service life of the copper bar. In addition to electrical performance, PPS plastic also provides mechanical protection for the copper bar. In complex environments such as power facilities or vehicle engine compartments, the copper bar may be subjected to accidental physical impact. The toughness and wear resistance of PPS plastic can absorb these impacts and prevent the copper bar from being damaged by external factors.

[0004] However, since the S atom in PPS is not saturated, the benzene ring and S atom on the molecular chain form a conjugated structure, making the thioether bond in the PPS macromolecule easily oxidized into sulfoxide and sulfone groups. The benzene ring and adjacent macromolecules are crosslinked due to the formation of oxygen bridges by oxidation, and even the main chain is broken, ultimately resulting in PPS having large rigidity, poor toughness, and being brittle, which greatly affects the performance of PPS. At the same time, the main chain of PPS is mainly composed of benzene rings, which has strong carbon-forming ability, resulting in a low tracking index (CTI). In combination with the defects of PPS material and the application conditions, it is of great significance to improve the tracking index, oxidation resistance, wear resistance, and mechanical properties of PPS material to expand the application prospects of polyphenylene sulfide. SUMMARY

[0005] In view of defects of the prior art, the present application aims to provide a preparation and application of a high-wear-resistance and high-track-creep-resistance composite material, and aims to solve problems of poor wear resistance, poor insulation, easy oxidation and poor heat conduction of PPS material.

[0006] The technical solution provided by the present application is as follows: In a first aspect, the present application provides a high-wear-resistance and high-track-creep-resistance composite material, taking polyphenylene sulfide as a matrix, and containing the following components in percentage by weight: Inorganic fiber 8%~32%; Wear-resistant and track-creep-resistant dual functional agent 4%~12%; Antioxidant 0.1%~5%; Insulating lubricant 0.1%~5%; Other auxiliary agent 0.1%~5%; The rest is polyphenylene sulfide.

[0007] In combination with the first aspect of the present application, in some embodiments, the diameter of the inorganic fiber is 2 μm to 15 μm, and / or the length is 4 mm to 10 mm.

[0008] In combination with the first aspect of the present application, in some embodiments, the inorganic fiber is one or more of glass fiber, basalt fiber, potassium titanate whisker, quartz fiber, wollastonite fiber, alumina fiber and silicon carbide fiber.

[0009] In combination with the first aspect of the present application, in some embodiments, the antioxidant is an organic antioxidant.

[0010] In combination with the first aspect of the present application, in some embodiments, the organic antioxidant is one or more of hindered phenol antioxidant, phosphite antioxidant and benzofuranone antioxidant.

[0011] In combination with the first aspect of the present application, in some embodiments, the insulating lubricant is one or more of ester lubricant, amide lubricant, metal soap lubricant and polyolefin lubricant.

[0012] In combination with the first aspect of the present application, in some embodiments, the wear-resistant and track-creep-resistant dual functional agent is one or more of silicon nitride, boron nitride, aluminum nitride, aluminum oxide, molybdenum disulfide and tungsten disulfide.

[0013] In combination with the first aspect of the present application, in some embodiments, the weight average molecular weight of the polyphenylene sulfide is 10000~50000.

[0014] In a second aspect, the present application provides a preparation method of a high-wear-resistance and high-track-creep-resistance composite material, comprising the following steps: Prepare raw materials according to the above weight percentage; Mix the polyphenylene sulfide with the antioxidant and the lubricant to obtain material A; Mix the polyphenylene sulfide with the wear-resistant and tracking-resistant bifunctional agent to obtain material B; Material A, material B and inorganic fibers are respectively added through three feeding ports to carry out melt extrusion, granulation and drying through a double-screw extruder.

[0015] In a third aspect, the application provides a copper bar, comprising an electric core and the high-wear-resistant and high-tracking-resistant index composite material as an insulating layer on the surface of the electric core.

[0016] Compared with the prior art, the technical scheme provided by the application has at least the following beneficial effects: The application adds the wear-resistant and tracking-resistant bifunctional agent to the polyphenylene sulfide matrix to make the specific wear rate of the polyphenylene sulfide composite material ≤5.8*10 -3 , and the CTI value reaches 200-250 V. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The morphological diagram of the aluminum oxide nanosheet used in embodiment 3 of the application.

[0019] Figure 2 The morphological diagram of the aluminum oxide microsphere used in embodiment 4 of the application.

[0020] Figure 3 The real object diagram of the copper bar. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the application more clear, the technical scheme of the application will be clearly and completely described below in combination with the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0022] For simplicity, only some explicit numerical ranges are disclosed herein. However, any lower limit can be combined with any upper limit to form a range not explicitly recited; and any lower limit can be combined with other lower limits to form a range not explicitly recited. Likewise, any upper limit can be combined with any other upper limit to form a range not explicitly recited. Moreover, although not explicitly recited, every point or individual number within a range is included in the range. Thus, every point or individual number can serve as its own lower limit or upper limit to combine with any other point or individual number or to combine with other lower limits or upper limits to form a range not explicitly recited.

[0023] It should be noted that, as used in this description, the terms "above", "below", "upper", "lower", "upward", "downward", "under" and the like, if used, can be used in relation to a given orientation of an embodiment or element thereof when such embodiment or element is oriented in a particular direction; such terms, if used, are used merely for convenience and do not require any particular orientation of an embodiment or element thereof. Terms concerning attachments, such as "secured", "connected", "supported", and the like, refer to an mechanical and / or electrical connection, whether direct or indirect, between or among the elements connected or attached by the term. The use of terms such as "attached", "connected", "supported", and the like are meant to include the use of a straight connection, a flexible connection, a rigid connection, a direct connection, an indirect connection, an electrical connection, a magnetic connection, a mechanical connection, and the like, unless otherwise specifically noted.

[0024] In the description of the specification, the description referring to the terms "any embodiment / aspect", "one embodiment / aspect", "some embodiments / aspect", "example", "specific example" or "some examples" means that a specific feature, structure, material or characteristic described in connection with the embodiment / aspect or example is included in at least one embodiment / aspect or example of the application. The illustrative descriptions in this specification are not necessarily directed at the same embodiment / aspect or example, and are not meant to be limiting. The specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments / aspect or examples. In addition, the different embodiments / aspect or examples described in this specification can be combined and combined with other embodiments / aspect or examples described in this specification, without mutual contradiction.

[0025] The above summary of the application does not mean that every disclosed embodiment or every implementation of the application is described. The following description illustrates the exemplary embodiments more specifically. These embodiments can be used in various combinations. In each instance, the enumeration is merely representative of a group, and should not be interpreted as exhaustive.

[0026] The high-wear-resistance high-CTI composite material provided by the application takes polyphenylene sulfide as a matrix and contains, in terms of weight percentage, 8-32% of inorganic fibers, 4-12% of wear-resistance and CTI double functional agents, 0.1-5% of antioxidants, 0.1-5% of insulating lubricants, 0.1-5% of other additives, and the rest of polyphenylene sulfide.

[0027] The technical effect of the composite material is derived from the following synergistic mechanism: the wear-resistance and CTI double functional agents form a dense protective layer in an electric field-pollutant environment, block the electric leakage path, and improve the CTI value; the layered crystal structure of the wear-resistance and CTI double functional agents provides solid lubrication, significantly reduces the friction coefficient, and reduces the specific wear rate; the fiber network formed by the inorganic fibers can improve the mechanical properties of the composite material and inhibit the formation of a conductive network, thereby strengthening the insulation; the organic antioxidants can prevent thermal degradation during processing and ensure the stability of the CTI value; and the insulating lubricants can optimize the melt flowability and avoid the generation of heat by friction, thereby preventing the decrease of the CTI value.

[0028] The composite material simultaneously achieves a CTI value of ≥200 V, a specific wear rate of ≤5.8*10 - 3 mm 3 / (N·m)) without sacrificing the flame-retardant grade and mechanical properties.

[0029] Some embodiments of the application use inorganic fibers with a diameter of 2-15 μm and a length of 4-10 mm. The smaller the diameter of the inorganic fibers, the larger the specific surface area and the stronger the interfacial bonding force with the polyphenylene sulfide matrix. However, too fine fibers (<2 μm) may agglomerate due to van der Waals forces, which destroys the homogeneity. The inorganic fibers with a diameter of 2-15 μm used in the application can balance the interfacial bonding force between the inorganic fibers and the polyphenylene sulfide matrix and the dispersibility of the inorganic fibers in the polyphenylene sulfide matrix.

[0030] Some embodiments of the application use one or more of glass fibers, basalt fibers, potassium titanate whiskers, quartz fibers, wollastonite fibers, alumina fibers, and silicon carbide fibers as the inorganic fibers. These inorganic fibers are all insulating materials, which eliminates the risk of electrical breakdown. If carbon fibers or metal fibers are used as reinforcing fibers, the CTI value will decrease sharply. If low-melting polymer fibers are selected, they may not match the processing temperature of polyphenylene sulfide because of their low melting point. At the same time, these inorganic fibers have high hardness, which can resist frictional stress and reduce surface spalling, thereby improving the wear resistance of the polyphenylene sulfide composite material.

[0031] Some embodiments of the present application employ one or more of hindered phenolic antioxidant, phosphite antioxidant, benzofuranone antioxidant as antioxidant. Hindered phenolic antioxidant, phosphite antioxidant, etc. can prevent polyphenylene sulfide from thermal oxidative degradation in high-temperature processing and long-term use.

[0032] Some embodiments of the present application employ one or more of pentaerythritol stearate, vinyl bis-stearamide, calcium stearate, magnesium stearate, polyethylene wax as lubricant. Pentaerythritol stearate, polyethylene wax, etc. can reduce the viscosity of the melt, optimize the fluidity and processability, avoid the extrusion blockage caused by additive agglomeration in the prior art, and reduce the wear rate of the friction interface during the melt extrusion of polyphenylene sulfide composite material.

[0033] In some embodiments of the present application, a dihydrogen phosphate salt is used as another auxiliary agent.

[0034] In some embodiments of the present application, the anti-wear and anti-tracking dual functional agent is one or more of silicon nitride, boron nitride, aluminum nitride, aluminum oxide, molybdenum disulfide, tungsten disulfide.

[0035] In some embodiments of the present application, the weight average molecular weight of the polyphenylene sulfide is 10000-50000.

[0036] The present application also provides a preparation method of a high-wear-resistance and high-anti-tracking-index composite material, comprising the following steps: Prepare raw materials according to the above weight percentage; Mix the polyphenylene sulfide with the antioxidant and the lubricant to obtain material A; Mix the polyphenylene sulfide with the anti-wear and anti-tracking dual functional agent to obtain material B; Add material A, material B and inorganic fibers through three feeding ports respectively, and perform melt extrusion, granulation and drying through a double-screw extruder.

[0037] The mixing of the polyphenylene sulfide with the antioxidant and the lubricant to obtain material A comprises: preliminarily mixing the polyphenylene sulfide with the antioxidant at room temperature; heating the preliminarily mixed material to an appropriate temperature; and fully mixing the heated material with the lubricant.

[0038] In some embodiments of the present application, the mixing of the polyphenylene sulfide with the anti-wear and anti-tracking dual functional agent to obtain material B comprises: pre-mixing the polyphenylene sulfide with the anti-wear and anti-tracking dual functional agent under stirring; grinding the pre-mixed material at an appropriate temperature; and screening the ground material.

[0039] In some embodiments of the present application, the mixing of the material A, the material B and the reinforcing agent comprises: uniformly mixing the material A and the material B in a mixing device; secondarily mixing the mixed material and the reinforcing agent in a kneading device; and feeding the secondarily mixed material into an extruding device for melt extrusion.

[0040] In some embodiments of the present application, the temperature control of the twin-screw extruder comprises: setting a lower temperature at a feeding section of the extruder; setting a higher temperature at a melting section of the extruder; and setting a medium temperature at a homogenizing section of the extruder.

[0041] In some embodiments of the present application, the granulation further comprises a cooling treatment of the granules; the cooling treatment is in a wind cooling mode; and the duration of the wind cooling treatment is adjusted according to the size of the granules.

[0042] The present application also provides an application of the high-wear-resistance and high-tracking-resistance-index composite material in preparing a copper bar. The extruding die is similar to a "U" shape, with a copper core in the middle. The PPS material is melt at high temperature, extruded through the die on the surface of the copper core, and formed on the surface of the copper core by accompanying the copper core.

[0043] The present application specifically provides a copper bar, which comprises an electric core and the high-wear-resistance and high-tracking-resistance-index composite material as an insulating layer on the surface of the electric core, as shown in Figure 3 .

[0044] The present application improves the oxidation resistance, wear resistance and mechanical properties of the PPS material by blending the PPS base material with an antioxidant, a wear-resistant and tracking-resistant bifunctional agent, a reinforcing agent and other additives, so as to improve the comprehensive performance of the PPS composite material. The addition of the antioxidant inhibits the oxidation of the sulfide bond; the addition of the wear-resistant and tracking-resistant bifunctional agent as a wear-resistant and tracking-resistant bifunctional agent plays a role in lubrication and repair of wear by absorbing energy when the composite material is stressed, the flaky wear-resistant and tracking-resistant bifunctional agent improves the insulation performance of the material by preventing the formation of a conductive network, and the high thermal conductivity of the wear-resistant and tracking-resistant bifunctional agent improves the thermal conductivity of the composite material; the addition of the reinforcing agent achieves the effects of reinforcement and toughening by absorbing stress through the fiber material; and the addition of the lubricant in the other additives not only has a good external lubrication effect, but also has a good internal lubrication effect, so as to improve the flowability and demolding property of the melt plastic in plastic forming and processing, and to make the product obtain extremely high surface smoothness and smoothness.

[0045] The technical solutions of the present application are described in detail through specific embodiments below. Unless otherwise specified, the raw materials and reagents used in the following embodiments are all common commercially available goods, or can be prepared by known methods.

[0046] The hindered phenolic antioxidant used in the following examples is β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid octadecyl ester, supplied by BASF Europe Co., Ltd.; the phosphite antioxidant is tris(2,4-di-tert-butylphenyl) phosphite, supplied by BASF Europe Co., Ltd.; the benzofuranone antioxidant is xylyl di-tert-butyl benzofuranone, supplied by Qingdao Jidejia New Material Technology Co., Ltd.; the polyphenylene sulfide is supplied by Zhejiang Xinhengcheng Co., Ltd., with a brand of 1130 and a molecular weight of 10000-50000; the glass fiber has a specification of 10 μm x 4 mm; the basalt fiber has a specification of 15 μm x 5 mm; the potassium titanate whisker has a specification of 2 μm x 10 mm; the nanosheet used in the following examples has a size of about 5 microns and a thickness of 5-20 nm; the microsphere used has a diameter of 1-5 microns; and the nanotube used has a size of 5-20 nm.

[0047] Example 1 The high-wear-resistance high-tracking-initiation-resistance-index composite material provided in this example has the following raw material components in terms of weight fractions: Table 1 Material composition of the composite material

[0048] The preparation method of the high-wear-resistance high-tracking-initiation-resistance-index composite material provided in this example includes the following steps: 1. Material A: polyphenylene sulfide mixed with hindered phenolic antioxidant and pentaerythritol stearate at 120°C; 2. Material B: polyphenylene sulfide pre-mixed and ground with boron nitride at 150°C; 3. Composite material forming: material A, material B and glass fiber are melt-extruded by a double-screw extruder (temperature: zone 1 160°C / zone 2 295°C / zone 3 290°C / zone 4 295°C / zone 5 280°C / zone 6 280°C / zone 7 260°C / zone 8 260°C / zone 9 270°C / zone 10 265°C, screw rotation speed 200 rpm) and granulated and dried.

[0049] Example 2 The high-wear-resistance high-tracking-initiation-resistance-index composite material provided in this example has the following raw material components in terms of weight fractions: Table 2 Material composition of the composite material

[0050] The preparation method of the high-wear-resistance high-tracking-initiation-resistance-index composite material provided in this example includes the following steps: 1. Material A: polyphenylene sulfide mixed with hindered phenolic antioxidant and pentaerythritol stearate at 120°C; 2. Material B: polyphenylene sulfide pre-mixed and ground with boron nitride at 150°C; 3. Composite material forming: melt extrusion of material A, material B and glass fiber through a double screw extruder (temperature: zone 1 160°C / zone 2 295°C / zone 3 290°C / zone 4 295°C / zone 5 280°C / zone 6 280°C / zone 7 260°C / zone 8 260°C / zone 9 270°C / zone 10 265°C, screw speed 200 rpm), granulation and drying.

[0051] Example 3 The present example provides a high wear resistance and high tracking index resistance composite material, the raw material components are shown in Table 3 in percentage by weight: Table 3 Material composition of the composite material

[0052] The preparation method of the high wear resistance and high tracking index resistance composite material provided by the present example includes the following steps: 1. Preparation of material A: polyphenylene sulfide and phosphite antioxidant, dihydrogen phosphate, vinyl bis stearamide are mixed at 130°C; 2. Preparation of material B: polyphenylene sulfide and aluminum nitride, alumina are pre-mixed and ground at 160°C; 3. Composite material forming: melt extrusion of material A, material B and basalt fiber through a double screw extruder (temperature: zone 1 170°C / zone 2 305°C / zone 3 300°C / zone 4 305°C / zone 5 300°C / zone 6 300°C / zone 7 280°C / zone 8 280°C / zone 9 290°C / zone 10 285°C, screw speed 300 rpm), granulation and drying.

[0053] Example 4 The present example provides a high wear resistance and high tracking index resistance composite material, the raw material components are shown in Table 4 in percentage by weight: Table 4 Material composition of the composite material

[0054] The preparation method of the high wear resistance and high tracking index resistance composite material provided by the present example includes the following steps: 1. Preparation of material A: polyphenylene sulfide and phosphite antioxidant, dihydrogen phosphate, vinyl bis stearamide are mixed at 130°C; 2. Preparation of material B: polyphenylene sulfide and aluminum nitride, alumina are pre-mixed and ground at 160°C; 3. Composite material forming: melt-extruding material A, material B and basalt fiber through a double screw extruder (temperature: zone 1 170°C / zone 2 305°C / zone 3 300°C / zone 4 305°C / zone 5 300°C / zone 6 300°C / zone 7 280°C / zone 8 280°C / zone 9 290°C / zone 10 285°C, screw speed 300 rpm), granulating and drying.

[0055] Example 5 The high wear resistance and high tracking index composite material provided in this example has the raw material components shown in Table 5 by weight fraction: Table 5 Material composition of the composite material

[0056] The method for preparing the high wear resistance and high tracking index composite material provided in this example includes the following steps: 1. Preparation of material A: mixing polyphenylene sulfide, benzofuranone antioxidant, calcium stearate and magnesium stearate at 140°C; 2. Preparation of material B: pre-mixing and grinding polyphenylene sulfide, molybdenum disulfide and tungsten disulfide at 170°C; 3. Composite material forming: melt-extruding material A, material B and potassium titanate whisker through a double screw extruder (temperature: zone 1 180°C / zone 2 325°C / zone 3 320°C / zone 4 325°C / zone 5 310°C / zone 6 310°C / zone 7 290°C / zone 8 290°C / zone 9 290°C / zone 10 295°C, screw speed 450 rpm), granulating and drying.

[0057] Comparative Example 1 This comparative example is a conventional PPS composite material (without adding bifunctional agent), and the raw material components are shown in Table 6 by weight fraction: Table 6 Material composition of the conventional PPS composite material

[0058] The method for preparing the high wear resistance and high tracking index composite material provided in this example includes the following steps: Material A (polyphenylene sulfide + antioxidant + lubricant) is directly mixed with glass fiber, melt-extruded through a double screw extruder (temperature / speed same as Example 1), granulated and dried.

[0059] Performance test: Test specimens were prepared using a 50-ton compression molding machine. The mold was heated to 300-320 °C, closed after loading, and pre-pressed at 5-10 MPa. Subsequently, 1-2 degassing steps were performed (key step). The pressure was then increased to 15-20 MPa and held for 5-15 minutes. The mold was cooled below 60 °C under pressure and demolded. The sheets were cut into the required test samples and the edges of all samples were finely ground and chamfered. The samples were conditioned for at least 24 hours in a standard environment (23 ± 2 °C, 50 ± 10% RH) before testing.

[0060] Table 7

[0061] Table 8 Performance test results

[0062] From the analysis of Comparative Example 1, Example 2 and Comparative Example 1, it can be seen that after adding boron nitride nanomaterial, the proportion of PPS base material is reduced, which can partially improve the CTI of the material, but the effect is not obvious. However, compared with boron nitride nanotubes, the sheet material is easier to form an insulating layer, so the CTI index is the highest.

[0063] The foregoing is merely an implementation of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite material with high wear resistance and high tracking index, characterized in that: Based on polyphenylene sulfide, it comprises, by weight percentage: Inorganic fibers: 8%~32%; Dual-function agent for wear resistance and tracking resistance: 4%~12%; Antioxidant 0.1%~5%; Insulating lubricant 0.1%~5%; Other adjuvants: 0.1%~5%; The balance is polyphenylene sulfide.

2. The high wear-resistant and high tracking index-resistant composite material according to claim 1, characterized in that: The inorganic fibers have a diameter of 2 μm to 15 μm and / or a length of 4 mm to 10 mm.

3. The high wear-resistant and high tracking index-resistant composite material according to claim 1 or 2, characterized in that: The inorganic fiber is one or more of the following: glass fiber, basalt fiber, potassium titanate whiskers, quartz fiber, wollastonite fiber, alumina fiber, and silicon carbide fiber.

4. The high wear-resistant and high tracking index-resistant composite material according to claim 1, characterized in that: The antioxidant is an organic antioxidant.

5. The high wear-resistant and high tracking index-resistant composite material according to claim 4, characterized in that: The organic antioxidant is one or more of hindered phenolic antioxidants, phosphite antioxidants, and benzofuranone antioxidants.

6. The high wear-resistant and high tracking index-resistant composite material according to claim 1, characterized in that: The insulating lubricant is one or more of the following: ester lubricant, amide lubricant, metal soap lubricant, and polyolefin lubricant.

7. The high wear-resistant and high tracking index-resistant composite material according to claim 1, characterized in that: The wear-resistant and tracking-resistant dual-function agent is one or more of silicon nitride, boron nitride, aluminum nitride, aluminum oxide, molybdenum disulfide, and tungsten disulfide.

8. The high wear-resistant and high tracking index-resistant composite material according to claim 1, characterized in that: The polyphenylene sulfide has a weight-average molecular weight of 10,000 to 50,000.

9. A method for preparing a composite material with high wear resistance and high tracking index, characterized in that, Includes the following steps: Prepare the raw materials according to the weight percentage of claim 1; Material A is obtained by mixing polyphenylene sulfide with antioxidants and lubricants; Material B is obtained by mixing polyphenylene sulfide with a bifunctional agent that is both abrasion resistant and tracking resistant. Material A, material B, and inorganic fiber are fed into a twin-screw extruder through three feeding ports for melt extrusion, granulation, and drying.

10. A copper busbar, characterized in that: The battery cell includes a high wear-resistant and high tracking index composite material as described in any one of claims 1 to 8 as an insulating layer on the surface of the battery cell.

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