Impact-resistant and scratch-resistant automobile hub cover and preparation method thereof

Abstract

The invention discloses an impact-resistant and scratch-resistant automobile hub cover and a preparation method thereof, and relates to the technical field of high polymer materials. The automobile hub cover at least comprises 100 parts of nylon 6 resin; 5 to 15 parts of a bismaleimide resin prepolymer; 10 to 15 parts of hydrogenated styrene-butadiene block copolymer grafted maleic anhydride; 10 to 20 parts of modified basalt fiber; 5 to 15 parts of modified polyarylester fiber; 0.2 to 0.5 part of an antioxidant; 0.3 to 0.8 part of a light stabilizer; 2-4 parts of color master batch; 0.3 to 0.8 part of a lubricant; the bismaleimide resin prepolymer is prepared by mixing 4, 4 '-diphenylmethane bismaleimide and 2, 2'-diallyl bisphenol A; the modified basalt fiber is modified by coprecipitation of polydopamine, polyethyleneimine and octa-amino cage type polysilsesquioxane functionalized graphene oxide; the modified polyarylester fiber is modified by coprecipitation of polydopamine and polyethyleneimine. The automobile hub cover prepared by the invention has low hygroscopicity, high impact resistance and excellent scratch resistance.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to an impact-resistant and scratch-resistant automotive wheel hubcap and its preparation method. Background Technology

[0002] As an important aesthetic and functional component, automotive wheel covers must possess a balance of beauty, weather resistance, and reliability. They are constantly exposed to complex and harsh environments, needing to withstand impacts from gravel, scratches from car wash brushes, UV radiation, diurnal temperature variations, and the high temperatures generated by the braking system. Currently, mainstream wheel cover materials mostly use PC, PC / ABS alloys, or ordinary modified PP. While PC and its alloys have good toughness, their heat resistance is limited, with long-term operating temperatures typically below 120℃, making them prone to heat deformation and aging when in close proximity to brake discs. Ordinary modified PP, on the other hand, suffers from poor rigidity, heat resistance, and scratch resistance.

[0003] Nylon (PA) materials, such as PA6 and PA66, are considered potential ideal alternatives due to their excellent mechanical strength, heat resistance, and chemical resistance. However, their widespread application is severely limited by two inherent drawbacks: First, their strong hygroscopicity leads to poor dimensional stability; products easily swell after absorbing water and shrink after drying, making it difficult to guarantee the assembly clearance with metal hubs, and their mechanical properties significantly decrease after water absorption. Second, pure nylon materials are notch sensitive, lack low-temperature impact toughness, and are prone to noticeable whitening under scratching, damaging their appearance.

[0004] While existing technologies employ glass fiber reinforced nylon to enhance rigidity and heat resistance, these often come at the cost of impact toughness, and their effects on scratch resistance and dimensional stability are limited. Other methods simply add toughening agents or lubricants, which struggle to maintain performance under combined conditions of high temperature, high humidity, and UV aging. Furthermore, the lack of synergistic effects between components fails to fundamentally resolve the challenges faced by nylon materials in high-end exterior components. Therefore, developing a method to simultaneously and fundamentally improve the impact resistance, scratch resistance, and dimensional stability of nylon-based wheel caps has significant industrial application value. Summary of the Invention

[0005] The purpose of this invention is to provide an impact-resistant and scratch-resistant automotive wheel hubcap and its manufacturing method, thereby solving the following technical problems: Existing nylon-based car wheel covers have problems such as being not scratch-resistant, not impact-resistant, and having poor performance due to moisture absorption.

[0006] The objective of this invention can be achieved through the following technical solutions: An impact-resistant and scratch-resistant car wheel hub cover, comprising at least the following parts by weight of raw materials: 100 parts Nylon 6 resin; 5-15 parts bismaleimide resin prepolymer; 10-15 parts hydrogenated styrene-butadiene block copolymer grafted with maleic anhydride; 10-20 parts modified basalt fiber; 5-15 parts modified polyarylate fiber; 0.2-0.5 parts antioxidant; 0.3-0.8 parts light stabilizer; 2-4 parts color masterbatch; 0.3-0.8 parts lubricant; The bismaleimide resin prepolymer is prepared by mixing 4,4'-diphenylmethane bismaleimide and 2,2'-diallyl bisphenol A. The modified basalt fiber is a co-precipitation modified by polydopamine, polyethyleneimine and octaaminocage-type polysilsesquioxane-functionalized graphene oxide. The modified polyaryl ester fiber is modified by co-precipitation of polydopamine and polyethyleneimine.

[0007] As a further aspect of the present invention: the mass ratio of 4,4'-diphenylmethane bismaleimide and 2,2'-diallyl bisphenol A in the bismaleimide resin prepolymer is 1:0.6-1.

[0008] As a further aspect of the present invention, the method for preparing the modified basalt fiber includes the following steps: An octaaminocage-type polysilsesquioxane dispersion was added to a graphene oxide dispersion, along with phosphorus pentoxide. The mixture was heated and stirred. After the reaction, the mixture was centrifuged, washed, and dried to obtain octaaminocage-type polysilsesquioxane-functionalized graphene oxide. Basalt fibers were added to a KH550 solution, ultrasonically treated, and dried to obtain activated basalt fibers. The octaaminocage-type polysilsesquioxane-functionalized graphene oxide, polydopamine, and polyethyleneimine were added to a Tris buffer solution, ultrasonically treated, and then the activated basalt fiber was added. After stirring, the mixture was washed and dried to obtain modified basalt fiber.

[0009] As a further aspect of the present invention: the mass ratio of the octaaminocage-type polysilsesquioxane to the graphene oxide is 1:0.8-1.2, and the mass of KH550 is 1%-3% of the mass of the basalt fiber.

[0010] As a further aspect of the present invention: the mass ratio of the octaaminocage-type polysilsesquioxane functionalized graphene oxide, the polydopamine, the polyethyleneimine, and the activated basalt fiber is 1-3:1-3:1-3:100.

[0011] As a further aspect of the present invention, the method for preparing the modified polyarylate fiber includes the following steps: Polydopamine and polyethyleneimine were added to a Tris buffer solution and sonicated. Then, polyarylate fibers that had been washed and dried with acetone were added, stirred, washed, and dried to obtain modified polyarylate fibers.

[0012] As a further aspect of the present invention: the mass ratio of the polydopamine, the polyethyleneimine and the polyarylate fiber is 1-3:1-3:100.

[0013] As a further aspect of the present invention: the antioxidant is at least one of antioxidant 1010 or antioxidant 168, the light stabilizer is at least one of light stabilizer 622 or light stabilizer 770, the color masterbatch is a red, yellow, green, blue or black color masterbatch with PA, PE or EVA resin as a carrier, and the lubricant is at least one of silicone powder, ethylene bis-stearamide, calcium stearate, ethylene bis-stearamide or oxidized polyethylene wax.

[0014] A method for preparing an impact-resistant and scratch-resistant automotive wheel hubcap as described in any one of the above claims, comprising at least the following preparation steps: Nylon 6 resin, bismaleimide resin prepolymer, hydrogenated styrene-butadiene block copolymer grafted with maleic anhydride, antioxidant, light stabilizer, color masterbatch and lubricant are added to a high-speed mixer in a certain mass ratio to obtain a premix. The premixed material is added from the main feed port of the twin-screw extruder, and the modified basalt fiber and modified polyarylate fiber are added from the side feed port. The mixture is melt-blended and granulated, dried, and then injection molded to obtain an impact-resistant and scratch-resistant car wheel hub cover.

[0015] The beneficial effects of this invention are: The impact-resistant and scratch-resistant automotive wheel hubcap prepared by this invention uses nylon 6 resin and bismaleimide resin prepolymer as the base material, and adds hydrogenated styrene-butadiene block copolymer grafted with maleic anhydride as a compatibilizer. Through the chemical reaction between bismaleimide resin and the terminal amino groups of nylon, a cross-linked network is formed, which significantly improves the dimensional stability and reliability of the product in humid environments. Modified basalt fiber and polyaryl ester fiber are also added to form a reinforcing network, which greatly improves the notched impact strength and scratch resistance. Both fibers are modified with polydopamine and polyethyleneimine. Polydopamine can form a highly adhesive film on the fiber surface, and its phenolic hydroxyl and amino groups can form hydrogen bonds and electrostatic interactions with the amino groups of polyethyleneimine. At the same time, the active amino groups of polyethyleneimine can further react with the end groups of nylon 6 and the anhydride groups of the compatibilizer to build a strong chemical bond interface, solving the problem of easy delamination in traditional fiber-reinforced materials. The car wheel hub cover prepared by this invention has high impact resistance and high scratch resistance, and significantly reduces moisture absorption. It can be exposed to complex and harsh environments for a long time and withstand the impact of gravel, scratching by car wash brushes, ultraviolet radiation, humid environments and high temperatures generated by the braking system.

[0016] In this invention, basalt fibers are modified by co-precipitation of polydopamine, polyethyleneimine, and octaaminocage-type polysilsesquioxane-functionalized graphene oxide. The basalt fibers serve as a rigid skeleton, greatly improving the material's strength, modulus, and heat resistance. The modification by polydopamine and polyethyleneimine enhances the dispersibility and compatibility of the basalt fibers in the resin matrix, ensuring efficient transfer of impact stress and improving the material's impact resistance. The two-dimensional sheet structure of graphene oxide and the nano-reinforcing effect of the octaaminocage-type polysilsesquioxane-functionalized graphene oxide improve the material's resistance to plastic deformation, making the surface more difficult to scratch and enhancing the material's scratch resistance.

[0017] This invention utilizes the excellent toughness and low water absorption of polyaryl ester fibers. After modification with polydopamine and polyethyleneimine, the interfacial bonding strength with the nylon 6 matrix is ​​significantly improved. The polyaryl ester fibers absorb a large amount of energy through their own plastic deformation and pull-out effect, thereby improving the notched impact strength of the composite material and avoiding toughening failure caused by weak interfacial bonding in unmodified fibers. Simultaneously, when the polyaryl ester fibers are dispersed in the nylon matrix, they effectively create a hydrophobic, non-absorbent network, hindering the diffusion path of water molecules within the matrix. This effectively reduces the overall water absorption rate and saturated water absorption rate of the composite material, improving the dimensional stability and reliability of the product in humid environments. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: The preparation method of modified basalt fiber includes the following steps: 1g of graphene oxide and 1g of octaaminocage-type polysilsesquioxane were added to 100mL beakers respectively. 200mL of methanol was added to the beaker containing graphene oxide and the mixture was sonicated for 1h in an ultrasonic machine. 100mL of methanol was added to the beaker containing octaaminocage-type polysilsesquioxane, and the mixture was first electromagnetically stirred for 0.5h and then sonicated for 0.5h. After sonication, the methanol dispersion of octaaminocage-type polysilsesquioxane was poured into the methanol dispersion of graphene oxide, and 1.5g of phosphorus pentoxide was gradually added over 10min. The mixture was then placed in a 60℃ water bath and reacted for 8h under electromagnetic stirring. After centrifugation, the mixture was washed repeatedly with deionized water 6 times and kept at 60℃ for 6h to obtain octaaminocage-type polysilsesquioxane-functionalized graphene oxide. 2.5g KH550 was dispersed in 500mL of deionized water / anhydrous ethanol solution, and 100g of basalt fiber with a length of 3mm and a diameter of 15μm was added. The mixture was ultrasonically treated for 30min and then dried in an oven at 120℃ for 2h to obtain activated basalt fiber. The prepared octaaminocage-type polysilsesquioxane functionalized graphene oxide, 2g polydopamine and 2g polyethyleneimine were added to 500mL Tris buffer solution (pH=8.5), sonicated for 30min, and then the above activated basalt fiber was added. The mixture was stirred at ambient temperature for 16h, rinsed with deionized water and dried under vacuum at 60℃ to obtain modified basalt fiber.

[0020] Example 2: The preparation method of modified polyarylate fiber includes the following steps: 2g of polydopamine and 2g of polyethyleneimine were added to 500mL of Tris buffer solution (pH=8.5), and ultrasonically treated for 30min. Then, 100g of polyarylate fiber (5.68dtex) that had been washed and dried with acetone was added. The mixture was slowly stirred at ambient temperature for 16h, thoroughly washed with deionized water, and vacuum dried at 60℃ to obtain modified polyarylate fiber.

[0021] Example 3: The preparation method of bismaleimide resin prepolymer includes the following steps: 4,4'-diphenylmethane bismaleimide and 2,2'-diallyl bisphenol A were accurately weighed at a mass ratio of 1:0.87. The beaker containing 2,2'-diallyl bisphenol A was placed in a forced-air drying oven and heated to melt at 130°C. The weighed 4,4'-diphenylmethane bismaleimide powder was then added and thoroughly mixed. The mixture was then placed in a vacuum oven at 140°C for degassing treatment to obtain the bismaleimide resin prepolymer.

[0022] Example 4: A method for preparing an impact-resistant and scratch-resistant automobile wheel hubcap includes the following steps: 100 parts by weight of nylon 6 resin (1030B) were vacuum dried at 100°C for 6 hours, and then added to a high-speed mixer along with 10 parts by weight of the bismaleimide resin prepolymer prepared in Example 3, 13 parts by weight of hydrogenated styrene-butadiene block copolymer grafted maleic anhydride (Kerteng 1901), 0.2 parts by weight of antioxidant 1010, 0.2 parts by weight of antioxidant 168, 0.5 parts by weight of light stabilizer 770, 3 parts by weight of black PA base color masterbatch, and 0.5 parts by weight of lubricant silicone powder. The mixture was mixed for 10 minutes to obtain a premix. The premixed material was added from the main feed port of the twin-screw extruder. 16 parts by weight of the modified basalt fiber prepared in Example 1 and 10 parts by weight of the modified polyarylate fiber prepared in Example 2 were added from the side feed port. The screw speed was 300 rpm, and the temperature settings were: Zone 1 240℃, Zone 2 250℃, Zone 3 255℃, Zone 4 260℃, Zone 5 255℃, and Die head 250℃. After melt extrusion, water cooling, pelletizing, and drying, the material was injected into the preheated wheel hub cover mold. Under the conditions of injection temperature 250℃ and mold temperature 100℃, the material was held under pressure, cooled, and ejected to obtain an impact-resistant and scratch-resistant automotive wheel hub cover.

[0023] Example 5: A method for preparing an impact-resistant and scratch-resistant automobile wheel hub cap includes the following steps: 100 parts by weight of nylon 6 resin (1030B) were vacuum dried at 100°C for 6 hours, and then added to a high-speed mixer along with 8 parts by weight of the bismaleimide resin prepolymer prepared in Example 3, 12 parts by weight of hydrogenated styrene-butadiene block copolymer grafted maleic anhydride (Kerteng 1901), 0.2 parts by weight of antioxidant 1010, 0.2 parts by weight of antioxidant 168, 0.5 parts by weight of light stabilizer 770, 3 parts by weight of black PA base color masterbatch, and 0.5 parts by weight of lubricant silicone powder. The mixture was mixed for 10 minutes to obtain a premix. The premixed material was added from the main feed port of the twin-screw extruder. 15 parts by weight of the modified basalt fiber prepared in Example 1 and 8 parts by weight of the modified polyarylate fiber prepared in Example 2 were added from the side feed port. The screw speed was 300 rpm, and the temperature settings were: Zone 1 240℃, Zone 2 250℃, Zone 3 255℃, Zone 4 260℃, Zone 5 255℃, and Die head 250℃. After melt extrusion, water cooling, pelletizing, and drying, the material was injected into the preheated wheel hub cover mold. Under the conditions of injection temperature 250℃ and mold temperature 100℃, the material was held under pressure, cooled, and ejected to obtain an impact-resistant and scratch-resistant automotive wheel hub cover.

[0024] Example 6: A method for preparing an impact-resistant and scratch-resistant automobile wheel hubcap includes the following steps: 100 parts by weight of nylon 6 resin (1030B) were vacuum dried at 100°C for 6 hours, and then added to a high-speed mixer along with 12 parts by weight of the bismaleimide resin prepolymer prepared in Example 3, 14 parts by weight of hydrogenated styrene-butadiene block copolymer grafted maleic anhydride (Kerteng 1901), 0.2 parts by weight of antioxidant 1010, 0.2 parts by weight of antioxidant 168, 0.5 parts by weight of light stabilizer 770, 3 parts by weight of black PA base color masterbatch, and 0.5 parts by weight of lubricant silicone powder. The mixture was mixed for 10 minutes to obtain a premix. The premixed material was added from the main feed port of the twin-screw extruder. 18 parts by weight of the modified basalt fiber prepared in Example 1 and 12 parts by weight of the modified polyarylate fiber prepared in Example 2 were added from the side feed port. The screw speed was 300 rpm, and the temperature settings were: Zone 1 240℃, Zone 2 250℃, Zone 3 255℃, Zone 4 260℃, Zone 5 255℃, and Die head 250℃. After melt extrusion, water cooling, pelletizing, and drying, the material was injected into the preheated wheel hub cover mold. Under the conditions of injection temperature 250℃ and mold temperature 100℃, the material was held under pressure, cooled, and ejected to obtain an impact-resistant and scratch-resistant automotive wheel hub cover.

[0025] Comparative Example 1: The preparation method of polydopamine and polyethyleneimine modified basalt fibers includes the following steps: 2.5g KH550 was dispersed in 500mL of deionized water / anhydrous ethanol solution, and 100g of basalt fiber with a length of 3mm and a diameter of 15μm was added. The mixture was ultrasonically treated for 30min and then dried in an oven at 120℃ for 2h to obtain activated basalt fiber. Add 2g of polydopamine and 2g of polyethyleneimine to 500mL of Tris buffer solution (pH=8.5), sonicate for 30min, then add the above activated basalt fiber, stir at ambient temperature for 6h, rinse with deionized water, and dry under vacuum at 60℃ to obtain polydopamine and polyethyleneimine modified basalt fiber.

[0026] Compared with Example 4, Comparative Example 2 only replaced the modified basalt fiber prepared in Example 1 with the modified polyarylate fiber prepared in Example 2. The other components and preparation methods were completely the same as those in Example 4.

[0027] Compared with Example 4, Comparative Example 3 only replaced the modified polyarylate fiber prepared in Example 2 with the modified basalt fiber prepared in Example 1 in the same mass as that in Example 4. The other components and preparation methods were completely the same as those in Example 4.

[0028] Compared with Example 4, Comparative Example 4 only replaced the modified basalt fiber prepared in Example 1 with the polydopamine and polyethyleneimine modified basalt fiber prepared in Comparative Example 1 by the same mass. The other components and preparation methods were completely the same as those in Example 4.

[0029] Compared with Example 4, Comparative Example 5 replaced the modified basalt fiber prepared in Example 1 with unmodified basalt fiber and the modified polyaryl ester fiber prepared in Example 2 with unmodified polyaryl ester fiber. The remaining components and preparation methods were completely consistent with Example 4.

[0030] Compared with Example 4, Comparative Example 6 did not add the bismaleimide resin prepolymer prepared in Example 3, but the remaining components and preparation methods were completely the same as in Example 4.

[0031] Performance testing Hardness testing: The test was conducted according to GB / T 2411-2008, using a Type D Shore hardness tester. During testing, five points were taken on each sample surface to measure hardness to minimize experimental error. At least 6 mm intervals were maintained between each point. The average hardness value was then calculated. The test results are shown in Table 1. Impact test: The test adopted the simply supported beam impact test mode. The size of the impact specimen and the test method followed the standard GB / T1043-2008. The test parameters were set as follows: impact velocity 2.9m / s, impact energy 5J. During the test, the impact equipment will measure the energy lost by the impact pendulum when it breaks the specimen, which is used to represent the impact resistance of the sample. The test results are shown in Table 1. Heat distortion temperature: According to GB / T 1634.2-2004, under a constant bending stress of 1.82MPa, the standard sample is immersed in a heat transfer medium with a constant rate of heating. When the deformation at the midpoint of the sample reaches the specified value (0.21mm), the temperature at this time is recorded, which is the heat distortion temperature; the test results are shown in Table 1. Water absorption performance test: Cut the sample, weigh the original weight, put the sample into deionized water, let it stand at room temperature, take the sample every 2.5 hours, wipe off the water, weigh the sample weight gain, repeat the test until the weight of the sample no longer changes, at which point the sample reaches the water absorption saturation state, and obtain the final value of the change of the water absorption rate of the sample over time as the saturation water absorption value; the test results are shown in Table 1. Friction and Wear Performance Testing: The tribological properties of the epoxy composite material were evaluated using a CSM tribological testing machine. The friction pair was a ball-disc contact type, and the motion mode was reciprocating sliding. The upper sample was a 6mm diameter bearing steel ball (GCr15), and the lower sample was the prepared PA6-based composite material. The experimental load range was 15N, the reciprocating motion frequency range was 3Hz, and the termination time was determined according to the set sliding distance. High-temperature tribological testing was performed by heating the lower sample with a heating plate at the bottom. The heating temperature range was from room temperature to 200℃. The heating curve was set through the system module, and after reaching the target temperature, it was held for 10 minutes before the friction test began. Before the friction test, the prepared PA6-based composite material required surface polishing. It was polished with 500#, 1000#, 1500#, and 2000# sandpaper, respectively, and then polished with 3000# diamond polishing paste to reduce the influence of surface roughness on the tribological properties of the tested material. Before the experiment, the steel ball and sample surfaces were wiped with anhydrous ethanol to prevent surface contamination. To minimize error, each experiment was repeated three times.

[0032] The coefficient of friction was calculated using the software integrated into the CSM testing machine. The volumetric wear rate was calculated using the formula ε=V / FL, where ε represents the volumetric wear rate (mm). 3 / Nm); V - Wear volume (mm) 3 F - Load (N); L - Total sliding distance (m); The test results are shown in Table 1; Table 1: Statistical Table of Performance Test Data of Automobile Wheel Hub Covers in Examples 4-6 and Comparative Examples 2-6

[0033] As shown in Table 1, the wheel hubcaps prepared by this invention achieve simultaneous improvement in impact resistance, scratch resistance, and dimensional stability through the synergistic design of composite modified fibers and resin matrix. Comparative Example 2, which only added modified polyaryl ester fibers, yielded the wheel hubcap with the highest impact strength but the worst heat resistance. Comparative Example 3, which only added modified basalt fibers, yielded the wheel hubcap with the highest heat resistance but the worst toughness. Comparative Example 4, where the modified basalt fibers were only modified with polydopamine and polyethyleneimine, resulted in a significant decrease in both impact strength and scratch resistance. Comparative Example 5, where the added fibers were modified, resulted in a comprehensive deterioration in the performance of the wheel hubcap, especially a significant decrease in impact strength and wear resistance. Comparative Example 6, which did not add bismaleimide resin prepolymer, resulted in a significant increase in water absorption.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An impact-resistant and scratch-resistant automotive wheel hub cap, characterized in that, It shall include at least the following parts by weight of raw materials: 100 parts Nylon 6 resin; 5-15 parts bismaleimide resin prepolymer; 10-15 parts hydrogenated styrene-butadiene block copolymer grafted with maleic anhydride; 10-20 parts modified basalt fiber; 5-15 parts modified polyarylate fiber; 0.2-0.5 parts antioxidant; 0.3-0.8 parts light stabilizer; 2-4 parts color masterbatch; 0.3-0.8 parts lubricant; The bismaleimide resin prepolymer is prepared by mixing 4,4'-diphenylmethane bismaleimide and 2,2'-diallyl bisphenol A. The modified basalt fiber is a co-precipitation modified by polydopamine, polyethyleneimine and octaaminocage-type polysilsesquioxane-functionalized graphene oxide. The modified polyaryl ester fiber is modified by co-precipitation of polydopamine and polyethyleneimine.

2. The impact-resistant and scratch-resistant automotive wheel hub cover according to claim 1, characterized in that, The mass ratio of 4,4'-diphenylmethane bismaleimide to 2,2'-diallyl bisphenol A in the bismaleimide resin prepolymer is 1:0.6-1.

3. The impact-resistant and scratch-resistant automotive wheel hub cover according to claim 1, characterized in that, The preparation method of the modified basalt fiber includes the following steps: An octaaminocage-type polysilsesquioxane dispersion was added to a graphene oxide dispersion, along with phosphorus pentoxide. The mixture was heated and stirred. After the reaction, the mixture was centrifuged, washed, and dried to obtain octaaminocage-type polysilsesquioxane-functionalized graphene oxide. Basalt fibers were added to a KH550 solution, ultrasonically treated, and dried to obtain activated basalt fibers. The octaaminocage-type polysilsesquioxane-functionalized graphene oxide, polydopamine, and polyethyleneimine were added to a Tris buffer solution, ultrasonically treated, and then the activated basalt fiber was added. After stirring, the mixture was washed and dried to obtain modified basalt fiber.

4. The impact-resistant and scratch-resistant automotive wheel hub cover according to claim 3, characterized in that, The mass ratio of the octaaminocage-type polysilsesquioxane to the graphene oxide is 1:0.8-1.2, and the mass of KH550 is 1%-3% of the mass of the basalt fiber.

5. The impact-resistant and scratch-resistant automotive wheel hub cover according to claim 3, characterized in that, The mass ratio of the octaaminocage-type polysilsesquioxane-functionalized graphene oxide, the polydopamine, the polyethyleneimine, and the activated basalt fiber is 1-3:1-3:1-3:

100.

6. The impact-resistant and scratch-resistant automotive wheel hub cover according to claim 1, characterized in that, The preparation method of the modified polyarylate fiber includes the following steps: Polydopamine and polyethyleneimine were added to a Tris buffer solution and sonicated. Then, polyarylate fibers that had been washed and dried with acetone were added, stirred, washed, and dried to obtain modified polyarylate fibers.

7. The impact-resistant and scratch-resistant automotive wheel hub cover according to claim 6, characterized in that, The mass ratio of the polydopamine, the polyethyleneimine, and the polyarylate fiber is 1-3:1-3:

100.

8. The impact-resistant and scratch-resistant automotive wheel hub cover according to claim 1, characterized in that, The antioxidant is at least one of antioxidant 1010 or antioxidant 168, the light stabilizer is at least one of light stabilizer 622 or light stabilizer 770, the color masterbatch is a red, yellow, green, blue or black color masterbatch with PA, PE or EVA resin as a carrier, and the lubricant is at least one of silicone powder, ethylene bis-stearamide, calcium stearate, ethylene bis-stearamide or oxidized polyethylene wax.

9. A method for preparing an impact-resistant and scratch-resistant automobile wheel hub cap as described in any one of claims 1-8, characterized in that, It includes at least the following preparation steps: Nylon 6 resin, bismaleimide resin prepolymer, hydrogenated styrene-butadiene block copolymer grafted with maleic anhydride, antioxidant, light stabilizer, color masterbatch and lubricant are added to a high-speed mixer in a certain mass ratio to obtain a premix. The premixed material is added from the main feed port of the twin-screw extruder, and the modified basalt fiber and modified polyarylate fiber are added from the side feed port. The mixture is melt-blended and granulated, dried, and then injection molded to obtain an impact-resistant and scratch-resistant car wheel hub cover.

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