High-strength mudguard and preparation method thereof

Abstract

The invention relates to the technical field of fenders, in particular to a high-strength fender and a preparation method thereof. The high-strength fender is prepared from the following raw materials in parts by weight: 35 to 45 parts of polypropylene resin, 20 to 30 parts of high-density polyethylene, 15 to 25 parts of porous silicon carbide grafted glass fiber, 8 to 12 parts of modified halloysite, 6 to 8 parts of basalt fiber, 3 to 5 parts of maleic anhydride grafted polypropylene and 1 to 3 parts of antioxidant. The high-strength mudguard provided by the invention is high in strength and flame-retardant, and aging of materials can be inhibited to a certain extent, so that the requirements of the market on high-performance mudguards are met.

Description

Technical Field

[0001] The present invention relates to the technical field of mudguards, and specifically, to a high-strength mudguard and a preparation method thereof. Background Art

[0002] The mudguard is one of the important accessories of an automobile body. Its main function is to prevent impurities such as mud and water splashes thrown out by the tires during driving from splashing onto the vehicle body, thereby keeping the vehicle body clean and beautiful. In addition, the mudguard can also reduce the impact of flying objects such as stones on the vehicle body to a certain extent and protect the vehicle body from damage. With the rapid development of the automotive industry and the continuous improvement of consumers' requirements for automotive performance, the performance requirements for mudguards are becoming increasingly strict. Mudguards with high strength, good wear resistance, and strong waterproof and anti-fouling capabilities have become new market demands.

[0003] A high-strength mudguard refers to a mudguard with excellent mechanical properties and durability. Its main characteristics are high strength, good toughness, and strong wear resistance. High-strength mudguards are usually made of composite materials such as glass fiber reinforced plastics (GFRP), carbon fiber reinforced plastics (CFRP), etc. These materials have the characteristics of light weight and high strength and can meet the requirements of automotive lightweight and high performance. In addition, when designing high-strength mudguards, factors such as compatibility with the vehicle body and installation convenience also need to be considered to ensure their reliability and comfort in actual use.

[0004] The application scope of high-strength mudguards is wide, and they are applicable not only to passenger cars but also to various vehicle types such as commercial vehicles and off-road vehicles. In harsh driving environments such as muddy roads and rainy areas, high-strength mudguards can play a greater role and effectively protect the vehicle body from damage.

[0005] Although high-strength mudguards have been widely used in the market, there are still many problems with existing high-strength mudguards and their preparation methods. Currently, common high-strength mudguards on the market are mainly made of composite materials such as GFRP and CFRP. However, during long-term use, these materials are easily affected by environmental factors, resulting in performance degradation, such as reduced strength and weakened toughness. In addition, some composite materials also have problems such as easy aging, which seriously affects the service life and safety of the mudguards. Based on this, the present invention proposes a high-strength mudguard and a preparation method thereof. Summary of the Invention

[0006] The present invention proposes a high-strength mudguard and a preparation method thereof, which have high strength, flame retardancy, and can inhibit the aging of materials to a certain extent.

[0007] The technical solution of the present invention is as follows: In a first aspect, the present invention provides a high-strength mudguard, which comprises the following raw materials in parts by weight: 35-45 parts of polypropylene resin, 20-30 parts of high-density polyethylene, 15-25 parts of glass fiber grafted with porous silicon carbide, 8-12 parts of modified halloysite, 6-8 parts of basalt fiber, 3-5 parts of maleic anhydride grafted polypropylene, and 1-3 parts of antioxidant.

[0008] As a further technical solution, the preparation method of the glass fiber grafted with porous silicon carbide includes: pretreating silicon carbide powder to obtain porous silicon carbide, then dispersing the porous silicon carbide in ethanol, adding glass fiber and silane coupling agent KH560, and reacting at 200-300 rpm and 55-65 °C for 10-14 h, followed by filtration and drying to obtain the product.

[0009] As a further technical solution, the weight ratio of the porous silicon carbide, ethanol, glass fiber, and silane coupling agent KH560 is 10: 30-50: 8-12: 0.5-1.5.

[0010] As a further technical solution, the pretreatment step includes: mixing α-SiC powder with a particle size of 20-50 μm with nano ammonium bicarbonate, adding polyvinyl alcohol, stirring at a pressure of 10-15 MPa and a temperature of 50-60 °C for 2-3 h to obtain a mixed slurry, heating to 300-320 °C at a rate of 3-5 °C / min in a nitrogen environment and holding for 1-2 h, and finally ultrasonically treating with a hydrofluoric acid-nitric acid mixed solution with a volume ratio of 1:3 for 30-40 min and then centrifuging.

[0011] As a further technical solution, the weight ratio of the α-SiC powder, nano ammonium bicarbonate, and polyvinyl alcohol is 100: 3-4: 1-2.

[0012] As a further technical solution, the preparation method of the modified halloysite includes: dispersing natural halloysite nanotubes in deionized water, ultrasonically treating to remove impurities, and drying to obtain pretreated halloysite; mixing silane coupling agent KH570 in ethanol and water, adjusting the pH value to 4-5, and hydrolyzing for 30-40 min to obtain a silane coupling agent solution; mixing the pretreated halloysite with the silane coupling agent solution, stirring and reacting at 60-80 °C for 4-8 h, centrifuging, washing with ethanol to remove unreacted coupling agent, and vacuum drying at 60-70 °C to constant weight to obtain the product.

[0013] As a further technical solution, the weight ratio of the silane coupling agent KH570, ethanol, and water is 1: 8-12: 0.5-1.5.

[0014] As a further technical solution, the mass ratio of the pretreated halloysite to the silane coupling agent solution is 1: 10-20.

[0015] As a further technical solution, the compatibilizer is maleic anhydride grafted polypropylene; the antioxidant includes antioxidant 1010 and / or antioxidant 168.

[0016] In a second aspect, the present invention provides a method for preparing a high-strength mudguard, the steps including: mixing polypropylene resin, high-density polyethylene, basalt fiber, glass fiber grafted with porous silicon carbide, maleic anhydride grafted polypropylene, modified halloysite, and antioxidant at a rotation speed of 300 - 400 rpm for 10 - 15 min; feeding into a screw extruder for melt mixing, extrusion granulation, and molding after adding into a mold at a temperature of 190 - 210 °C to obtain the high-strength mudguard.

[0017] The working principle and beneficial effects of the present invention are as follows: 1. In the present invention, the glass fiber grafted with porous silicon carbide forms a porous structure through the pretreatment step. This structure can enhance the interfacial bonding force between the fiber and the matrix materials (such as polypropylene resin and high-density polyethylene). The porous structure provides more physical anchoring points, making the bonding between the fiber and the matrix more firm, thereby improving the tensile strength of the material. Moreover, the porous structure can also delay the aging process of the material through physical barrier effects and improve the hydrophobicity of the material. This is because the porous structure can reduce the contact area between water and the interior of the material, thereby reducing the negative impact of water on the material properties. In addition, silicon carbide itself has excellent flame retardant properties. Grafting it onto the glass fiber in a porous form can further enhance the flame retardancy of the material, enabling the mudguard to still maintain good performance in high-temperature or fire environments.

[0018] 2. In the present invention, the natural halloysite is modified by silane coupling agent KH570, which can optimize the dispersion of halloysite in the matrix material. After modification, the surface properties of halloysite change, and the compatibility with the matrix material is improved, thus avoiding the occurrence of agglomeration phenomena, enabling halloysite to be more evenly distributed in the matrix material. The modification treatment also enhances the interfacial bonding force between halloysite and the matrix material. This enhanced interfacial bonding force helps to improve the mechanical properties of the material, especially the tensile strength. At the same time, good interfacial bonding can also reduce the occurrence of stress concentration phenomena and improve the overall stability of the material. In addition, the addition of modified halloysite can also enhance the aging resistance of the material, because the modification treatment can reduce the interfacial defects between halloysite and the matrix material, thereby reducing the negative impact of the external environment on the material properties.

[0019] 3. In the present invention, basalt fiber, as a high-performance fiber material, has excellent stiffness and high-temperature aging resistance. Adding it to the fender material can further improve the overall stiffness and high-temperature aging resistance of the material. This enables the fender to maintain good shape stability and performance during long-term use.

[0020] 4. In the present invention, the synergistic effect of porous silicon carbide-grafted glass fiber, modified halloysite, and basalt fiber realizes the optimal comprehensive performance of the fender material. This synergistic effect not only improves the mechanical strength, hydrophobicity, flame retardancy, and aging resistance of the material. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0022] In the present invention, the polypropylene resin model is H5300; the high-density polyethylene model is Qatar TR571; the length of the glass fiber is 2 mm and the diameter is 0.05 mm; the halloysite particle size is 325 mesh, purchased from Zhengzhou Jinyangguang Ceramics Co., Ltd., the average length of the basalt fiber is 2 mm, and the average diameter is 20 μm, purchased from Haining Anjie Composite Materials Co., Ltd.; the polyvinyl alcohol model is 2488, purchased from Langfang Tianya Energy Saving Technology Co., Ltd.; the maleic anhydride-grafted polypropylene model is CMG9801.

[0023] Example 1 In this example, a high-strength fender is provided, including the following raw materials in parts by weight: 40 parts of polypropylene resin, 25 parts of high-density polyethylene, 20 parts of porous silicon carbide-grafted glass fiber, 10 parts of modified halloysite, 7 parts of basalt fiber, 4 parts of maleic anhydride-grafted polypropylene, and 2 parts of antioxidant; Among them, the preparation method of porous silicon carbide grafted glass fiber includes: mixing α-SiC powder with a particle size of 35 μm with nano ammonium bicarbonate, adding polyvinyl alcohol, and stirring for 2.5 h at a pressure of 12 MPa and a temperature of 55 °C for dispersion to obtain a mixed slurry. Heating to 310 °C at a rate of 4 °C / min in a nitrogen environment and holding for 1.5 h, and finally centrifuging after ultrasonic treatment with a hydrofluoric acid-nitric acid mixed solution with a volume ratio of 1:3 for 35 min to obtain porous silicon carbide; the weight ratio of α-SiC powder, nano ammonium bicarbonate, and polyvinyl alcohol is 100:3.5:1.5; subsequently, the porous silicon carbide is dispersed in ethanol, and glass fiber and silane coupling agent KH560 are added, and the reaction is carried out at 250 rpm and 60 °C for 12 h, and after filtration and drying, it is obtained; the weight ratio of porous silicon carbide, ethanol, glass fiber, and silane coupling agent KH560 is 10:40:10:1; Among them, the preparation method of modified halloysite includes: dispersing natural halloysite nanotubes in deionized water, ultrasonic treatment to remove impurities, and drying at 70 °C to obtain pretreated halloysite; mixing silane coupling agent KH570 in ethanol and water, adjusting the pH value to 4.5, and hydrolyzing for 35 min to obtain a silane coupling agent solution; the weight ratio of silane coupling agent KH570, ethanol, and water is 1:10:1; mixing the pretreated halloysite with the silane coupling agent solution, stirring and reacting at 70 °C for 6 hours, centrifuging, washing with ethanol to remove unreacted coupling agent, and vacuum drying at 65 °C to constant weight to obtain; the mass ratio of pretreated halloysite to silane coupling agent solution is 1:15; The compatibilizer is maleic anhydride grafted polypropylene; the antioxidant is antioxidant 1010 and antioxidant 168 with a weight ratio of 3:1; The preparation method of this high-strength fender includes the following steps: mixing polypropylene resin, high-density polyethylene, basalt fiber, porous silicon carbide grafted glass fiber, maleic anhydride grafted polypropylene, modified halloysite, and antioxidant at a rotation speed of 350 rpm for 12 min; feeding into a screw extruder for melt mixing, extrusion granulation, and molding after adding to a mold to obtain.

[0024] Example 2 In this example, a high-strength fender is provided, including the following raw materials in parts by weight: 35 parts of polypropylene resin, 20 parts of high-density polyethylene, 15 parts of porous silicon carbide grafted glass fiber, 8 parts of modified halloysite, 6 parts of basalt fiber, 3 parts of maleic anhydride grafted polypropylene, and 1 part of antioxidant; Among them, the preparation method of the porous silicon carbide grafted glass fiber includes: mixing α-SiC powder with a particle size of 20 μm with nano ammonium bicarbonate, adding polyvinyl alcohol, stirring for 2 h at a pressure of 10 MPa and a temperature of 50 °C for dispersion to obtain a mixed slurry, heating to 300 °C at a rate of 3 °C / min in a nitrogen environment and holding for 1 h, and finally subjecting to ultrasonic treatment with a hydrofluoric acid-nitric acid mixed solution with a volume ratio of 1:3 for 30 min and then centrifuging to obtain porous silicon carbide; the weight ratio of α-SiC powder, nano ammonium bicarbonate and polyvinyl alcohol is 100:3:1; subsequently, the porous silicon carbide is dispersed in ethanol, and glass fiber and silane coupling agent KH560 are added, and the reaction is carried out at 200 rpm and 55 °C for 10 h, and after filtration and drying, it is obtained; the weight ratio of porous silicon carbide, ethanol, glass fiber and silane coupling agent KH560 is 10:30:8:0.5; Among them, the preparation method of the modified halloysite includes: dispersing natural halloysite nanotubes in deionized water, ultrasonic treatment to remove impurities, and drying at 70 °C to obtain pretreated halloysite; mixing silane coupling agent KH570 in ethanol and water, adjusting the pH value to 4, and hydrolyzing for 30 min to obtain a silane coupling agent solution; the weight ratio of silane coupling agent KH570, ethanol and water is 1:8:0.5; mixing the pretreated halloysite with the silane coupling agent solution, stirring and reacting at 60 °C for 4 h, after centrifuging, washing with ethanol to remove the unreacted coupling agent, and vacuum drying at 60 °C to constant weight to obtain; the mass ratio of the pretreated halloysite to the silane coupling agent solution is 1:10; The compatibilizer is maleic anhydride grafted polypropylene; the antioxidant is antioxidant 1010 and antioxidant 168 with a weight ratio of 3:1; The preparation method of this high-strength mudguard includes the following steps: mixing polypropylene resin, high-density polyethylene, basalt fiber, porous silicon carbide grafted glass fiber, maleic anhydride grafted polypropylene, modified halloysite, and antioxidant at a rotation speed of 300 rpm for 10 min; feeding into a screw extruder, melting and kneading at a temperature of 190 °C, extruding and granulating, and then adding into a mold for molding to obtain.

[0025] Example 3 In this example, a high-strength mudguard is provided, which includes the following raw materials in parts by weight: 45 parts of polypropylene resin, 30 parts of high-density polyethylene, 25 parts of porous silicon carbide grafted glass fiber, 12 parts of modified halloysite, 8 parts of basalt fiber, 5 parts of maleic anhydride grafted polypropylene, and 3 parts of antioxidant; Among them, the preparation method of the porous silicon carbide grafted glass fiber includes: mixing α-SiC powder with a particle size of 50 μm with nano ammonium bicarbonate, adding polyvinyl alcohol, stirring for 3 h at a pressure of 15 MPa and a temperature of 60 °C for dispersion to obtain a mixed slurry, heating to 320 °C at a rate of 5 °C / min in a nitrogen environment and holding for 2 h, and finally centrifuging after ultrasonic treatment with a hydrofluoric acid-nitric acid mixed solution with a volume ratio of 1:3 for 40 min to obtain porous silicon carbide; the weight ratio of α-SiC powder, nano ammonium bicarbonate and polyvinyl alcohol is 100:4:2; then dispersing the porous silicon carbide in ethanol, adding glass fiber and silane coupling agent KH560, reacting at 300 rpm and 65 °C for 14 h, filtering and drying to obtain; the weight ratio of porous silicon carbide, ethanol, glass fiber and silane coupling agent KH560 is 10:50:12:1.5; Among them, the preparation method of the modified halloysite includes: dispersing natural halloysite nanotubes in deionized water, ultrasonic treatment to remove impurities, and drying at 70 °C to obtain pretreated halloysite; mixing silane coupling agent KH570 in ethanol and water, adjusting the pH value to 5, and hydrolyzing for 40 min to obtain a silane coupling agent solution; the weight ratio of silane coupling agent KH570, ethanol and water is 1:12:1.5; mixing the pretreated halloysite with the silane coupling agent solution, stirring and reacting at 80 °C for 8 hours, centrifuging, washing with ethanol to remove the unreacted coupling agent, and vacuum drying at 70 °C to constant weight to obtain; the mass ratio of the pretreated halloysite to the silane coupling agent solution is 1:20; The compatibilizer is maleic anhydride grafted polypropylene; the antioxidant is antioxidant 1010 and antioxidant 168 with a weight ratio of 3:1; The preparation method of this high-strength fender includes the following steps: mixing polypropylene resin, high-density polyethylene, basalt fiber, porous silicon carbide grafted glass fiber, maleic anhydride grafted polypropylene, modified halloysite, and antioxidant at a rotation speed of 400 rpm for 15 min; feeding into a screw extruder, melting and kneading at a temperature of 210 °C, extruding and granulating, and then adding to a mold for molding to obtain.

[0026] Example 4 In this example, a high-strength fender is provided, which includes the following raw materials in parts by weight: 35 parts of polypropylene resin, 30 parts of high-density polyethylene, 15 parts of porous silicon carbide grafted glass fiber, 12 parts of modified halloysite, 6 parts of basalt fiber, 5 parts of maleic anhydride grafted polypropylene, and 1 part of antioxidant; Among them, the preparation method of the porous silicon carbide-grafted glass fiber includes: mixing α-SiC powder with a particle size of 50 μm with nano ammonium bicarbonate, adding polyvinyl alcohol, and stirring for 2 h at a pressure of 10 MPa and a temperature of 60 °C for dispersion to obtain a mixed slurry. Heating it to 300 °C at a rate of 5 °C / min in a nitrogen environment and holding for 2 h. Finally, ultrasonic treatment with a hydrofluoric acid-nitric acid mixed solution with a volume ratio of 1:3 for 30 min and then centrifuging to obtain porous silicon carbide; the weight ratio of α-SiC powder, nano ammonium bicarbonate, and polyvinyl alcohol is 100:4:1; Subsequently, the porous silicon carbide is dispersed in ethanol, and glass fiber and silane coupling agent KH560 are added, and the reaction is carried out at 300 rpm and 55 °C for 14 h. After filtration and drying, it is obtained; the weight ratio of porous silicon carbide, ethanol, glass fiber, and silane coupling agent KH560 is 10:30:12:0.5; Among them, the preparation method of the modified halloysite includes: dispersing natural halloysite nanotubes in deionized water, ultrasonic treatment to remove impurities, and drying at 70 °C to obtain pretreated halloysite; mixing silane coupling agent KH570 in ethanol and water, adjusting the pH value to 4, and hydrolyzing for 40 min to obtain a silane coupling agent solution; the weight ratio of silane coupling agent KH570, ethanol, and water is 1:8:1.5; mixing the pretreated halloysite with the silane coupling agent solution, stirring and reacting at 60 °C for 8 h, after centrifugation, washing with ethanol to remove the unreacted coupling agent, and vacuum drying at 60 °C to constant weight to obtain it; the mass ratio of the pretreated halloysite to the silane coupling agent solution is 1:20; The compatibilizer is maleic anhydride-grafted polypropylene; the antioxidant is antioxidant 1010 and antioxidant 168 with a weight ratio of 3:1; The preparation method of this high-strength fender includes the steps of: mixing polypropylene resin, high-density polyethylene, basalt fiber, porous silicon carbide-grafted glass fiber, maleic anhydride-grafted polypropylene, modified halloysite, and antioxidant at a rotation speed of 300 rpm for 15 min; feeding it into a screw extruder for melt mixing, extrusion granulation at a temperature of 190 °C, and then adding it to a mold for molding to obtain it.

[0027] Comparative Example 1 Based on Example 1 with adjustments, different from Example 1, in Comparative Example 1, the porous silicon carbide-grafted glass fiber is replaced with silicon carbide-grafted glass fiber. The preparation method includes: dispersing α-SiC powder with a particle size of 35 μm in ethanol, adding glass fiber and silane coupling agent KH560, and reacting at 250 rpm and 60 °C for 12 h. After filtration and drying, it is obtained; the weight ratio of porous silicon carbide, ethanol, glass fiber, and silane coupling agent KH560 is 10:40:10:1.

[0028] Comparative Example 2 Based on Example 1, with adjustments made. Different from Example 1, in Comparative Example 2, the glass fiber grafted with porous silicon carbide is replaced with glass fiber.

[0029] Comparative Example 3 Based on Example 1, with adjustments made. Different from Example 1, in Comparative Example 3, the glass fiber grafted with porous silicon carbide is not added as a raw material.

[0030] Comparative Example 4 Based on Example 1, with adjustments made. Different from Example 1, in Comparative Example 4, the modified halloysite is replaced with halloysite.

[0031] Comparative Example 5 Based on Example 1, with adjustments made. Different from Example 1, in Comparative Example 5, the modified halloysite is not added as a raw material.

[0032] Comparative Example 6 Based on Example 1, with adjustments made. Different from Example 1, in Comparative Example 6, the basalt fiber is not added as a raw material.

[0033] Test Example 1: The high-strength mudguards prepared in the aforementioned Examples 1-4 and Comparative Examples 1-6 were tested as follows: Tensile strength: Tested with reference to ISO 527-1-2012, and the tensile rate was 10 mm / min; Contact angle: Tested with reference to GB / T 24368-2009, and the water droplet volume was maintained at 4 μL during the test; Oxygen index test: Tested with reference to IOS 4589-2; Aging resistance: After aging in an oven at 100 °C for one week, the tensile properties were measured, and the tensile strength retention rate was calculated; The results are shown in Table 1 below: Table 1

[0034] Combined with the above content, it can be seen that compared with the ordinary silicon carbide grafted glass fiber in Comparative Example 1 and Comparative Examples 2 and 3, the glass fiber grafted with porous silicon carbide significantly improves the tensile strength, hydrophobicity, flame retardancy and aging resistance of the material. This is because the porous structure can enhance the interfacial bonding between the fiber and the matrix, delay aging through physical barrier, and improve hydrophobicity at the same time. In Comparative Example 4, the unmodified halloysite or the absence of halloysite in Comparative Example 5 led to a decrease in tensile strength and aging resistance, indicating that the modification treatment optimized the dispersion and interfacial bonding of halloysite, thereby improving the mechanical properties and anti-aging ability. The absence of basalt fiber in Comparative Example 6 led to a decrease in tensile strength and aging resistance, indicating that basalt fiber, as a reinforcement, further improved the stiffness and high-temperature anti-aging ability of the material. The synergistic effect of the porous silicon carbide grafted fiber, modified halloysite and basalt fiber in Example 1 achieved the optimal comprehensive performance: high mechanical strength, excellent hydrophobicity, good flame retardancy and outstanding aging resistance. The absence or replacement of any component led to a significant deterioration of the performance, which also indicated that the combination of the three was the key to material design.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-strength fender, characterized in that: The invention comprises the following raw materials in parts by weight: 35-45 parts of polypropylene resin, 20-30 parts of high-density polyethylene, 15-25 parts of porous silicon carbide grafted glass fiber, 8-12 parts of modified halloysite, 6-8 parts of basalt fiber, 3-5 parts of maleic anhydride grafted polypropylene and 1-3 parts of antioxidant.

2. A high-strength fender according to claim 1, characterized in that: The preparation method of the porous silicon carbide grafted glass fiber comprises: pre-treating silicon carbide powder to obtain porous silicon carbide, then dispersing the porous silicon carbide in ethanol, adding glass fiber and silane coupling agent KH560, reacting at 200-300rpm and 55-65°C for 10-14h, filtering and drying to obtain the obtained product.

3. A high-strength fender according to claim 2, characterized in that: The weight ratio of the porous silicon carbide, ethanol, glass fiber and silane coupling agent KH560 is 10:30-50:8-12:0.5-1.

5.

4. The high-strength fender according to claim 2, characterized in that: The pretreatment step comprises: mixing α-SiC powder with a particle size of 20-50 μm with nano-ammonium bicarbonate, adding polyvinyl alcohol, stirring for 2-3 hours under the conditions of a pressure of 10-15 MPa and a temperature of 50-60° C. to disperse to obtain a mixed slurry, heating to 300-320° C. at a rate of 3-5° C. / min in a nitrogen environment and keeping the temperature for 1-2 hours, and finally ultrasonically treating with a hydrofluoric acid-nitric acid mixture with a volume ratio of 1:3 for 30-40 minutes and then centrifuging and separating.

5. The high-strength fender according to claim 4, characterized in that: The weight ratio of the α-SiC powder, nano-ammonium bicarbonate and polyvinyl alcohol is 100:3-4:1-2.

6. The high-strength fender according to claim 1, characterized in that: The preparation method of the modified halloysite comprises: dispersing natural halloysite nanotubes in deionized water, removing impurities by ultrasonic treatment, and obtaining pretreated halloysite after drying; mixing silane coupling agent KH570 in ethanol and water, adjusting the pH value to 4-5, and hydrolyzing for 30-40 minutes to obtain a silane coupling agent solution; mixing the pretreated halloysite with the silane coupling agent solution, stirring and reacting at 60-80° C. for 4-8 hours, centrifugally separating, washing with ethanol to remove unreacted coupling agent, and vacuum drying at 60-70° C. to obtain the modified halloysite.

7. The high-strength fender according to claim 6, characterized in that: The weight ratio of the silane coupling agent KH570, ethanol and water is 1:8-12:0.5-1.

5.

8. The high-strength fender according to claim 6, characterized in that: The mass ratio of the pretreated halloysite to the silane coupling agent solution is 1:10-20.

9. The high-strength fender according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted polypropylene; the antioxidant includes antioxidant 1010 and / or antioxidant 168.

10. A method for preparing a high-strength fender according to any one of claims 1 to 9, characterized in that the steps include: Polypropylene resin, high-density polyethylene, basalt fiber, porous silicon carbide grafted glass fiber, maleic anhydride grafted polypropylene, modified halloysite and antioxidant are mixed at a rotation speed of 300-400 rpm for 10-15 minutes; the mixture is sent to a screw extruder for melt mixing, extrusion granulation and molding at a temperature of 190-210° C. to obtain a high-strength fender.

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