High-wear-resistant nylon material, composite gear and application thereof in electric vehicle

Abstract

The application relates to the technical field of high polymer compounds, and particularly discloses a high-wear-resistance nylon material, a composite gear and application of the composite gear in an electric vehicle.A high-wear-resistance nylon material comprises the following components: nylon 66, modified glass fiber, hyperbranched polymer and filler; the modified glass fiber is obtained by increasing the surface roughness of the glass fiber through organic modification, so that the bonding force between the glass fiber and the nylon matrix is enhanced.The high-wear-resistance nylon material prepared by the application has the advantages of good toughness and high wear resistance.

Description

Technical Field

[0001] This application relates to the field of polymer compound technology, and more specifically, to a high wear-resistant nylon material, composite gears, and their application in electric vehicles. Background Technology

[0002] In the process of the automotive industry's transformation towards electrification, wear-resistant nylon materials and their derived composite gears have gradually become key components of power transmission systems due to their unique advantages, and their application value is becoming increasingly prominent in the field of electric vehicles. Nylon, or polyamide, possesses several excellent properties: 1. It is lightweight and has outstanding mechanical properties, including good tensile strength and rigidity, enabling it to withstand mechanical loads; 2. It has a low coefficient of surface friction and self-lubricating properties; 3. It has good chemical resistance and processability, making it easy to manufacture various complex structures according to different needs. However, pure nylon materials have drawbacks when used to manufacture composite gears, such as insufficient mechanical strength, weak wear resistance, large molding shrinkage, and susceptibility to warping. Therefore, additives are used to improve these properties.

[0003] In the fabrication of composite gears, nylon is often used as the core matrix material. Additives used to improve nylon properties typically include reinforcing materials such as fibers and whiskers, or functional fillers such as graphene and molybdenum disulfide. The addition of reinforcing materials can significantly improve the rigidity and impact resistance of the gears; however, poor compatibility between the reinforcing materials and nylon at the interface is a common problem, leading to unsatisfactory performance of nylon composite materials.

[0004] Patent application CN114716821A discloses a glass fiber reinforced nylon material and its preparation method. This invention's glass fiber reinforced nylon material comprises the following raw materials: nylon, polyethylene polyamine, glass fiber, and other additives. The glass fiber reinforced nylon material of this invention is prepared by uniformly mixing nylon, polyethylene polyamine, and other additives in a mixer to obtain a mixture; then adding the mixture to a twin-screw extruder for melt blending; adding glass fiber through side feeding; extruding the material into strips; and finally, pelletizing and drying the strips. This invention's glass fiber reinforced nylon material exhibits good hydrolysis resistance, and the material has a low torque during extrusion, which can improve processing efficiency.

[0005] While the method described in the aforementioned document, which involves directly adding glass fibers to the mixture, is convenient, it carries the risk of uneven dispersion of the glass fibers within the nylon matrix, leading to fiber agglomeration. This uneven dispersion creates stress concentration points within the material. When the material is subjected to external forces, the agglomerated glass fibers cannot effectively transfer and distribute the load, resulting in suboptimal mechanical performance, affecting product quality, and limiting the application of nylon materials in fields requiring high consistency in mechanical properties. Summary of the Invention

[0006] To further improve the compatibility between fibers and nylon, and thus enhance the mechanical and wear-resistant properties of nylon materials, this application provides a high-wear-resistant nylon material, a composite gear, and its application in electric vehicles.

[0007] In a first aspect, this application provides a high-wear-resistant nylon material, which adopts the following technical solution: A high abrasion-resistant nylon material comprising the following components: nylon 66, modified glass fiber, hyperbranched polymer, and filler; The modified glass fiber is composed of glass fiber and a metal organophosphorus framework; The hyperbranched polymer is made from raw materials including siloxy derivatives, polyhydroxy compounds and epichlorohydrin.

[0008] By adopting the above technical solution, a metal-organic phosphine framework is generated on the surface of glass fiber, increasing the roughness of the glass fiber and thus increasing the contact area between the modified glass fiber and the nylon matrix. This increases the bonding force between the modified glass fiber and the nylon matrix. At the same time, under external force, the larger contact area prevents slippage between the fiber and the nylon matrix. Introducing terminal epoxy groups into the hyperbranched polymer allows the epoxy groups to react with the terminal amino and carboxyl groups of nylon to form a slightly cross-linked network, inhibiting molecular chain slippage in nylon materials and thus improving the dimensional stability of nylon. Furthermore, the three-dimensional branched network brought about by the hyperbranched structure can quickly disperse stress, avoid stress concentration, delay crack propagation, and further improve the toughness of nylon.

[0009] Preferably, the method for preparing the modified glass fiber includes the following steps: mixing glass fiber, methanol, 1,2-bis(diphenylphosphine)ethane and polyvinylpyrrolidone evenly, then adding a mixed solution of zinc nitrate hexahydrate and methanol, reacting, filtering, and drying to obtain the modified glass fiber.

[0010] Preferably, the preparation method of the hyperbranched polymer includes the following steps: mixing a siloxy derivative, a polyhydroxy compound, and p-toluenesulfonic acid to carry out a first-stage polymerization reaction; then adding the siloxy derivative and p-toluenesulfonic acid to carry out a second-stage polymerization reaction; then adding the polyhydroxy compound and p-toluenesulfonic acid to carry out a third-stage polymerization reaction; and finally adding epichlorohydrin to react and obtain the polymer.

[0011] Preferably, the average length of the glass fiber is 1-5 mm. More preferably, the average length of the glass fiber is 3 mm.

[0012] Preferably, the polyhydroxy compound is one or more of glycerol, triethanolamine, and N-methyldiethanolamine.

[0013] Preferably, the mass ratio of 1,2-bis(diphenylphosphine)ethane, zinc nitrate hexahydrate, and polyvinylpyrrolidone is 1:(1.3-2):(1-1.5).

[0014] Preferably, the temperature of the first stage polymerization reaction, the second stage polymerization reaction, and the third stage polymerization reaction are all 120-150℃, and the time is 3-6h.

[0015] Preferably, the filler comprises molybdenum disulfide and nano-silica.

[0016] Secondly, this application provides a composite gear, which is made by injection molding of an iron core covered with the high wear-resistant nylon material.

[0017] Preferably, the injection molding temperature is 220-260℃, the injection molding pressure is 70-90MPa, and the injection molding time is 20-40s.

[0018] Thirdly, this application provides an application of the aforementioned composite gear in an electric vehicle.

[0019] In summary, this application has the following beneficial effects: 1. In the preparation process of high wear-resistant nylon materials, the terminal epoxy groups of the hyperbranched polymer undergo ring-opening reactions with the terminal amino and carboxyl groups in the nylon 66 molecular chain, forming a slightly cross-linked network with nylon, inhibiting molecular chain slippage, thereby improving the creep resistance and heat distortion temperature of nylon, as well as the processing fluidity and dimensional stability of nylon.

[0020] 2. The three-dimensional branched network of the hyperbranched structure can quickly disperse stress, avoid stress concentration, reduce crack propagation rate, and further improve the toughness of nylon.

[0021] 3. The increased surface roughness of modified glass fiber increases the contact area between glass fiber and nylon. Furthermore, the rough surface of modified glass fiber enhances the physical anchoring effect between fiber and nylon through mechanical interlocking, reducing interfacial slippage and interfacial defects, thereby improving the peel resistance and fatigue resistance of the composite material. In addition, the chelation effect between phosphine groups in modified glass fiber and the metal matrix enhances the bonding force between nylon and metal, improving the stability of the composite gear.

[0022] 4. The benzene ring structure present in the modified glass fiber and the terminal epoxy hyperbranched polyester further enhances the bonding force between the modified glass fiber and nylon, improves the dispersibility of the modified glass fiber and its compatibility with nylon, thereby improving the wear resistance and toughness of the composite material. Attached Figure Description

[0023] Figure 1 This is the instantaneous friction curve of the high wear-resistant nylon material in Embodiment 1 of this application.

[0024] Figure 2 This is the instantaneous friction curve of the high abrasion resistant nylon material in Embodiment 2 of this application.

[0025] Figure 3 This is the instantaneous friction curve of the high wear-resistant nylon material in Embodiment 3 of this application. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the embodiments.

[0027] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0028] Example 1 The high abrasion-resistant nylon material of this embodiment is composed of the following components: 50g nylon 66, 15g modified glass fiber, 2g hyperbranched polymer, 3g molybdenum disulfide, 1g nano silica, 0.2g antioxidant 1010, 0.5g stearic acid, and 0.2g silane coupling agent KH-550.

[0029] The modified glass fiber of this embodiment is prepared as follows: 10g of glass fiber with an average length of 3mm is weighed and put into a 500mL beaker, 200g of ethanol is added, and the mixture is sonicated for 30min. After filtration, 200g of deionized water is added and the mixture is sonicated for 20min. After filtration and drying, the fiber is put into a 500mL flask, 280g of methanol, 0.3g of 1,2-bis(diphenylphosphine)ethane, and 0.3g of polyvinylpyrrolidone are added. The mixture is stirred at room temperature for 1h, and then a mixed solution of 0.39g of zinc nitrate hexahydrate and 20g of methanol is added. The mixture is reacted for 1h. After the reaction is completed, the fiber is centrifuged, washed, and dried to obtain the modified glass fiber.

[0030] The preparation method of the hyperbranched polymer in this embodiment is as follows: 20g of phenyltriethoxysilane, 14g of glycerol, 6g of triethanolamine, and 0.2g of p-toluenesulfonic acid were weighed and added to a 500mL four-necked flask. The mixture was stirred and mixed, and the temperature was raised to 130℃ under a nitrogen atmosphere. The reaction was carried out for 3 hours. Then, 128g of phenyltriethoxysilane and 0.85g of p-toluenesulfonic acid were added, and the reaction was continued for 5 hours. After the reaction was completed, the temperature was adjusted to 140℃, and 92g of glycerol, 40g of triethanolamine, and 1.5g of p-toluenesulfonic acid were accurately weighed. The reaction was continued for 3 hours. After the reaction was completed, the polymer was obtained by rotary evaporation under reduced pressure. 7.2 g of the polymer was weighed and placed in a 250 mL three-necked flask. 16 g of acetone and 1 g of tetrabutylammonium bromide were added, and the mixture was stirred for 40 min. Then, 17.5 g of epichlorohydrin was added at a rate of 1.8 g / min. The temperature was adjusted to 65 °C, and the reaction was allowed to proceed for 3 h. The residual epichlorohydrin was then removed by vacuum distillation to obtain a mixture. 20 g of 25% sodium hydroxide solution was then added to the mixture at a rate of 1 g / min. After the addition was completed, the temperature was adjusted to 80 °C, and the reaction was allowed to continue for 2 h. After the reaction was completed, the mixture was centrifuged, filtered, and rotary evaporated to obtain the hyperbranched polymer.

[0031] The preparation method of the high wear-resistant nylon material in this embodiment is as follows: 50g of nylon 66, 15g of modified glass fiber, 3g of molybdenum disulfide, and 1g of nano-silica were weighed and vacuum dried at 80℃ for 10h. Then, the dried nylon 66, modified glass fiber, molybdenum disulfide, and nano-silica were mixed, and 2g of hyperbranched polymer, 0.2g of antioxidant 1010, 0.5g of stearic acid, and 0.2g of silane coupling agent KH-550 were added and mechanically mixed for 10min to obtain a mixture. Subsequently, the mixture was extruded into shape using a twin-screw extruder. The temperatures of the four sections of the extruder were 195℃, 220℃, 235℃, and 240℃, and the twin-screw speed was 40r / min to obtain the high wear-resistant nylon material.

[0032] The preparation method of the composite gear in this embodiment is as follows: 100g of high wear-resistant nylon material is weighed and put into the hopper of the injection molding machine. Under the action of the screw rotation, it is fed into the barrel heated at 240°C. After being mixed evenly, it is injected into the injection mold with an iron core and injection molded. The injection temperature is 220°C, the pressure is 90MPa, and the injection time is 20s. After the injection is completed, it is dried at 110°C for 3 hours to obtain the composite gear.

[0033] Example 2 The high abrasion-resistant nylon material of this embodiment is composed of the following components: 75g nylon 66, 20g modified glass fiber, 0.4g hyperbranched polymer, 5g molybdenum disulfide, 3g nano silica, 0.4g antioxidant 1010, 0.8g stearic acid, and 0.4g silane coupling agent KH-550.

[0034] The modified glass fiber of this embodiment is prepared as follows: 10g of glass fiber with an average length of 3mm is weighed and put into a 500mL beaker, 200g of ethanol is added, and the mixture is sonicated for 30min. After filtration, 200g of deionized water is added and the mixture is sonicated for 20min. After filtration and drying, the fiber is put into a 500mL flask, 280g of methanol, 0.3g of 1,2-bis(diphenylphosphine)ethane, and 0.45g of polyvinylpyrrolidone are added. The mixture is stirred at room temperature for 1.5h, and then a mixed solution of 0.6g of zinc nitrate hexahydrate and 20g of methanol is added. The mixture is reacted for 50min. After the reaction is completed, the fiber is centrifuged, washed, and dried to obtain the modified glass fiber.

[0035] The preparation method of the hyperbranched polymer in this embodiment is as follows: 24g of phenyltriethoxysilane, 15g of triethanolamine, 23g of N-methyldiethanolamine, and 0.25g of p-toluenesulfonic acid were weighed and added to a 500mL four-necked flask. The mixture was stirred and mixed, and the temperature was raised to 120°C under a nitrogen atmosphere for 6 hours. Then, 96g of phenyltriethoxysilane and 0.75g of p-toluenesulfonic acid were added, and the reaction was continued for another 6 hours. After the reaction was completed, 45g of accurately weighed triethanolamine, 60g of glycerol, and 1.3g of p-toluenesulfonic acid were added, and the reaction was continued for another 4 hours. After the reaction was completed, the polymer was obtained by rotary evaporation under reduced pressure. The polymer was weighed and placed in a 250mL three-necked flask. 18g of acetone and 1g of tetrabutylammonium bromide were added and stirred for 50min. Then, 17g of epichlorohydrin was added at a rate of 1.5g / min. The temperature was adjusted to 70℃ and the reaction was allowed to proceed for 3h. The residual epichlorohydrin was then removed by vacuum distillation to obtain a mixture. 20g of 25% sodium hydroxide solution was then added to the mixture at a rate of 1g / min. After the addition was completed, the temperature was adjusted to 80℃ and the reaction was allowed to continue for 2h. After the reaction was completed, the mixture was centrifuged, filtered, and rotary evaporated to obtain the hyperbranched polymer.

[0036] The preparation method of the high wear-resistant nylon material in this embodiment is as follows: 75g of nylon 66, 20g of modified glass fiber, 5g of molybdenum disulfide, and 3g of nano-silica were weighed and vacuum dried at 90℃ for 10h. Then, the dried nylon 66, modified glass fiber, molybdenum disulfide, and nano-silica were mixed, and 0.4g of hyperbranched polymer, 0.4g of antioxidant 1010, 0.8g of stearic acid, and 0.4g of silane coupling agent KH-550 were added and mechanically mixed for 10min to obtain a mixture. Subsequently, the mixture was extruded into shape using a twin-screw extruder. The temperatures of the four sections of the extruder were 195℃, 220℃, 235℃, and 240℃, and the twin-screw speed was 40r / min to obtain the high wear-resistant nylon material.

[0037] The preparation method of the composite gear in this embodiment is as follows: 150g of high wear-resistant nylon material is weighed and put into the hopper of the injection molding machine. Under the action of the screw rotation, it is fed into the barrel heated at 240℃. After being mixed evenly, it is injected into the injection mold with an iron core and injection molded. The injection temperature is 260℃, the pressure is 70MPa, and the injection time is 40s. After the injection is completed, it is dried at 120℃ for 3 hours to obtain the composite gear.

[0038] Example 3 The high abrasion-resistant nylon material of this embodiment is composed of the following components: 70g nylon 66, 18g modified glass fiber, 4g hyperbranched polymer, 3.5g molybdenum disulfide, 2.5g nano silica, 0.3g antioxidant 1010, 0.7g stearic acid, and 0.3g silane coupling agent KH-550.

[0039] The modified glass fiber of this embodiment is prepared as follows: 10g of glass fiber with an average length of 3mm is weighed and put into a 500mL beaker, 200g of ethanol is added, and the mixture is sonicated for 30min. After filtration, 200g of deionized water is added and the mixture is sonicated for 20min. After filtration and drying, the fiber is put into a 500mL flask, 280g of methanol, 0.3g of 1,2-bis(diphenylphosphine)ethane, and 0.4g of polyvinylpyrrolidone are added. The mixture is stirred at room temperature for 1h, and then a mixed solution of 0.45g of zinc nitrate hexahydrate and 20g of methanol is added. The mixture is reacted for 1h. After the reaction is completed, the fiber is centrifuged, washed, and dried to obtain the modified glass fiber.

[0040] The preparation method of the hyperbranched polymer in this embodiment is as follows: 20g of phenyltriethoxysilane, 44.1g of glycerol, and 0.3g of p-toluenesulfonic acid were weighed and added to a 500mL four-necked flask, stirred and mixed, and heated to 150℃ under a nitrogen atmosphere for 4 hours. Then, 55g of phenyltriethoxysilane and 0.6g of p-toluenesulfonic acid were added, and the reaction continued for 3 hours. After the reaction was completed, 80g of accurately weighed glycerol and 1g of p-toluenesulfonic acid were added, and the reaction continued for 6 hours. After the reaction was completed, the polymer was obtained by rotary evaporation under reduced pressure. 4g of the polymer was weighed and placed... Add 16g of acetone and 1g of tetrabutylammonium bromide to a 250mL three-necked flask, stir for 40min, then add 18g of epichlorohydrin at a rate of 2g / min, adjust the temperature to 75℃, and react for 2.5h. Remove the residual epichlorohydrin by vacuum distillation to obtain a mixture. Then add 20g of 25% sodium hydroxide solution at a rate of 1g / min to the mixture. After the addition is complete, adjust the temperature to 80℃ and continue the reaction for 2h. After the reaction is complete, centrifuge, filter, and rotary evaporate to obtain the hyperbranched polymer.

[0041] The preparation method of the high wear-resistant nylon material in this embodiment is as follows: 70g of nylon 66, 18g of modified glass fiber, 3.5g of molybdenum disulfide, and 2.5g of nano-silica were weighed and vacuum dried at 80℃ for 8h. Then, the dried nylon 66, modified glass fiber, molybdenum disulfide, and nano-silica were mixed, and 18g of modified glass fiber, 4g of hyperbranched polymer, 0.3g of antioxidant 1010, 0.7g of stearic acid, and 0.3g of silane coupling agent KH-550 were added and mechanically mixed for 10min to obtain a mixture. The mixture was then extruded using a twin-screw extruder. The temperatures of the four sections of the extruder were 195℃, 220℃, 235℃, and 240℃, and the twin-screw speed was 40r / min to obtain the high wear-resistant nylon material.

[0042] The preparation method of the composite gear in this embodiment is as follows: 100g of high wear-resistant nylon material is weighed and put into the hopper of the injection molding machine. Under the action of the screw rotation, it is fed into the barrel heated at 240°C. After being mixed evenly, it is injected into the injection mold with an iron core and injection molded. The injection temperature is 250°C, the pressure is 85MPa, and the injection time is 30s. After the injection is completed, it is dried at 110°C for 3 hours to obtain the composite gear.

[0043] Comparative Example 1 The high abrasion-resistant nylon material of this comparative example is composed of the following components: 50g nylon 66, 15g modified glass fiber, 2g hyperbranched polymer, 3g molybdenum disulfide, 1g nano silica, 0.2g antioxidant 1010, 0.5g stearic acid, and 0.2g silane coupling agent KH-550.

[0044] The modified glass fiber of this comparative example was prepared as follows: 10g of glass fiber with an average length of 3mm was weighed and placed in a 500mL beaker, 200g of ethanol was added, and the mixture was sonicated for 30min. After filtration, 200g of deionized water was added, and the mixture was sonicated for 20min. After filtration and drying, the fiber was placed in a 500mL flask, and 280g of methanol, 0.3g of 1,2-bis(diphenylphosphine)ethane, and 0.3g of polyvinylpyrrolidone were added. The mixture was stirred at room temperature for 1h, and then a mixed solution of 0.39g of zinc nitrate hexahydrate and 20g of methanol was added. The mixture was reacted for 1h. After the reaction was completed, the fiber was centrifuged, washed, and dried to obtain the modified glass fiber.

[0045] The preparation method of the hyperbranched polymer in this comparative example is as follows: 20g of phenyltriethoxysilane, 14g of glycerol, 6g of triethanolamine and 0.2g of p-toluenesulfonic acid were weighed and added to a 500mL four-necked flask, stirred and mixed, and heated to 130℃ under a nitrogen atmosphere and reacted for 3h. Then, 128g of phenyltriethoxysilane and 0.85g of p-toluenesulfonic acid were added, and the reaction was continued for 5h. After the reaction was completed, the temperature was adjusted to 140℃, and 92g of glycerol, 40g of triethanolamine and 1.5g of p-toluenesulfonic acid were accurately weighed and added. The reaction was continued for 3h. After the reaction was completed, the mixture was subjected to rotary evaporation under reduced pressure to obtain the hyperbranched polymer.

[0046] The preparation method of the high wear-resistant nylon material in this comparative example is as follows: 50g of nylon 66, 15g of modified glass fiber, 3g of molybdenum disulfide, and 1g of nano-silica were weighed and vacuum dried at 80℃ for 10h. Then, the dried nylon 66, modified glass fiber, molybdenum disulfide, and nano-silica were mixed, and 2g of hyperbranched polymer, 0.2g of antioxidant 1010, 0.5g of stearic acid, and 0.2g of silane coupling agent KH-550 were added and mechanically mixed for 10min to obtain a mixture. Subsequently, the mixture was extruded into shape using a twin-screw extruder. The temperatures of the four sections of the extruder were 195℃, 220℃, 235℃, and 240℃, and the twin-screw speed was 40r / min, resulting in the high wear-resistant nylon material.

[0047] The preparation method of the composite gear in this comparative example is as follows: 100g of high wear-resistant nylon material is weighed and put into the hopper of the injection molding machine. Under the action of the screw rotation, it is fed into the barrel heated at 240℃. After being mixed evenly, it is injected into the injection mold with an iron core and injection molded. The injection temperature is 220℃, the pressure is 90MPa, and the injection time is 20s. After the injection is completed, it is dried at 110℃ for 3h to obtain the composite gear.

[0048] Comparative Example 2 The high abrasion-resistant nylon material of this comparative example is composed of the following components: 50g nylon 66, 15g modified glass fiber, 2g hyperbranched polymer, 3g molybdenum disulfide, 1g nano silica, 0.2g antioxidant 1010, 0.5g stearic acid, and 0.2g silane coupling agent KH-550.

[0049] The modified glass fiber of this comparative example was prepared as follows: 10g of glass fiber with an average length of 3mm was weighed and placed in a 500mL beaker, 200g of ethanol was added, and the mixture was sonicated for 30min. After filtration, 200g of deionized water was added, and the mixture was sonicated for 20min. After filtration and drying, the fiber was placed in a 500mL flask, and 280g of methanol, 0.3g of 1,2-bis(diethylphosphine)ethane, and 0.3g of polyvinylpyrrolidone were added. The mixture was stirred at room temperature for 1h, and then a mixed solution of 0.39g of zinc nitrate hexahydrate and 20g of methanol was added. The mixture was reacted for 1h. After the reaction was completed, the fiber was centrifuged, washed, and dried to obtain the modified glass fiber.

[0050] The preparation method of the hyperbranched polymer in this comparative example is as follows: 20g of phenyltriethoxysilane, 14g of glycerol, 6g of triethanolamine, and 0.2g of p-toluenesulfonic acid were weighed and added to a 500mL four-necked flask. The mixture was stirred and mixed, and the temperature was raised to 130℃ under a nitrogen atmosphere. The reaction was carried out for 3 hours. Then, 128g of phenyltriethoxysilane and 0.85g of p-toluenesulfonic acid were added, and the reaction was continued for 5 hours. After the reaction was completed, the temperature was adjusted to 140℃, and 92g of glycerol, 40g of triethanolamine, and 1.5g of p-toluenesulfonic acid were accurately weighed. The reaction was continued for 3 hours. After the reaction was completed, the polymer was obtained by rotary evaporation under reduced pressure. Weigh 7.2g of polymer and place it in a 250mL three-necked flask. Add 16g of acetone and 1g of tetrabutylammonium bromide. Stir for 40min, then add 17.5g of epichlorohydrin at a rate of 1.8g / min. Adjust the temperature to 65℃ and react for 3h. Remove the residual epichlorohydrin by vacuum distillation to obtain a mixture. Add 20g of 25% sodium hydroxide solution at a rate of 1g / min to the mixture. After the addition is complete, adjust the temperature to 80℃ and continue the reaction for 2h. After the reaction is complete, centrifuge, filter, and rotary evaporate to obtain the terminal epoxy hyperbranched polymer.

[0051] The preparation method of the high wear-resistant nylon material in this comparative example is as follows: 50g of nylon 66, 15g of modified glass fiber, 3g of molybdenum disulfide, and 1g of nano-silica were weighed and vacuum dried at 80℃ for 10h. Then, the dried nylon 66, modified glass fiber, molybdenum disulfide, and nano-silica were mixed, and 2g of hyperbranched polymer, 0.2g of antioxidant 1010, 0.5g of stearic acid, and 0.2g of silane coupling agent KH-550 were added and mechanically mixed for 10min to obtain a mixture. Subsequently, the mixture was extruded into shape using a twin-screw extruder. The temperatures of the four sections of the extruder were 195℃, 220℃, 235℃, and 240℃, and the twin-screw speed was 40r / min, resulting in the high wear-resistant nylon material.

[0052] The preparation method of the composite gear in this comparative example is as follows: 100g of high wear-resistant nylon material is weighed and put into the hopper of the injection molding machine. Under the action of the screw rotation, it is fed into the barrel heated at 240℃. After being mixed evenly, it is injected into the injection mold with an iron core and injection molded. The injection temperature is 220℃, the pressure is 90MPa, and the injection time is 20s. After the injection is completed, it is dried at 110℃ for 3h to obtain the composite gear.

[0053] Performance testing 1. Impact resistance test Referring to standard GB / T 1043.1-2008, the impact performance of high abrasion resistant nylon materials was tested using an impact testing machine. The sample size was 80mm×10mm×4mm, the notch width was 8mm, the test temperature was 25℃, and the pendulum energy was 25J.

[0054] 2. Tensile strength test Referring to standard GB / T 1447-2005, the tensile properties of high abrasion resistant nylon materials were tested using a universal testing machine. The sample size was 150mm×10mm×4mm, the tensile rate was 10mm / min, and the test temperature was 25℃.

[0055] 3. Abrasion resistance test Referring to standard GB / T 3960-2016, the friction and wear performance of high wear-resistant nylon materials was tested using a friction and wear testing machine. The sample size was 30mm×7mm×6mm, the metal ring rotation speed was 200r / min, the load was set at 196N, the friction pair was subjected to sliding friction for 2 hours, and the test environment temperature was 25℃.

[0056] The instantaneous friction curves of the high wear-resistant nylon materials in Examples 1-3 are as follows: Figure 1-3 As shown.

[0057] The test data of various properties of the high abrasion-resistant nylon materials of Examples 1-3 and Comparative Examples 1-2 are shown in Table 1 below: Table 1. Test data of high abrasion-resistant nylon materials in Examples 1-3 and Comparative Examples 1-2. Analysis of Examples 1-3 and Comparative Examples 1-2, combined with Table 1, shows that the high-wear-resistant nylon material with modified glass fiber and hyperbranched polymer exhibits good mechanical properties and wear resistance. In Comparative Example 1, the hyperbranched polymer prepared does not contain epoxy groups at its end groups compared to Examples 1-3, making it difficult to react with nylon and form a continuous three-dimensional network structure, thus reducing the toughness of the high-wear-resistant nylon material in Comparative Example 1. In Comparative Example 2, the modified glass fiber does not contain benzene ring groups, resulting in a lower bonding force between the modified glass fiber and nylon compared to Examples 1-3, thus reducing the toughness and abrasion resistance of the high-wear-resistant nylon material in Comparative Example 2.

[0058] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-wear-resistant nylon material, characterized in that, It includes the following components: Nylon 66, modified glass fiber, hyperbranched polymer, and filler; The modified glass fiber is composed of glass fiber and a metal organophosphorus framework; The hyperbranched polymer is made from raw materials including siloxy derivatives, polyhydroxy compounds and epichlorohydrin.

2. The high wear-resistant nylon material according to claim 1, characterized in that, The method for preparing the modified glass fiber includes the following steps: mixing glass fiber, methanol, 1,2-bis(diphenylphosphine)ethane and polyvinylpyrrolidone evenly, then adding a mixed solution of zinc nitrate hexahydrate and methanol, reacting, filtering, and drying to obtain the modified glass fiber.

3. The high wear-resistant nylon material according to claim 1, characterized in that, The preparation method of the hyperbranched polymer includes the following steps: mixing a siloxy derivative, a polyhydroxy compound and p-toluenesulfonic acid, carrying out a first-stage polymerization reaction, then adding the siloxy derivative and p-toluenesulfonic acid to carry out a second-stage polymerization reaction, then adding the polyhydroxy compound and p-toluenesulfonic acid to carry out a third-stage polymerization reaction, and finally adding epichlorohydrin to react and obtain the polymer.

4. A high-wear-resistant nylon material according to claim 1 or 2, characterized in that, The average length of the glass fiber is 1-5 mm.

5. The high wear-resistant nylon material according to claim 1, characterized in that, The polyhydroxy compound is one or more of glycerol, triethanolamine, and N-methyldiethanolamine.

6. The high wear-resistant nylon material according to claim 2, characterized in that, The mass ratio of 1,2-bis(diphenylphosphine)ethane, zinc nitrate hexahydrate, and polyvinylpyrrolidone is 1:(1.3-2):(1-1.5).

7. The high wear-resistant nylon material according to claim 3, characterized in that, The temperature for the first, second, and third stage polymerization reactions is 120-150℃, and the time is 3-6 hours.

8. A composite gear, characterized in that, The iron core is prepared by injection molding by coating it with the high wear-resistant nylon material as described in any one of claims 1 to 7.

9. A composite gear according to claim 8, characterized in that, The injection molding temperature is 220-260℃, the injection molding pressure is 70-90MPa, and the injection molding time is 20-40s.

10. The application of a composite gear according to claim 8 or 9 in an electric vehicle.

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