Toughened wear-resistant high-performance chinlon and preparation method thereof

Abstract

The invention provides toughened and wear-resistant high-performance chinlon and a preparation method thereof, and belongs to the technical field of composite materials, the toughened and wear-resistant high-performance chinlon is prepared from the following raw materials by weight: 50-150 parts of PA resin, 2-8 parts of a toughening modifier, 1-5 parts of a high temperature resistant auxiliary agent, 0.2-0.8 part of an antioxidant, and 1-2 parts of a lubricant; wherein the toughening modifier is prepared by taking carboxylated graphene and EPDM (Ethylene-Propylene-Diene Monomer) grafted maleic anhydride as main raw materials; the high-temperature-resistant auxiliary agent is prepared from boron nitride nanosheets, aluminum borate crystal whiskers, calcium stearate and 3-glycidyl ether oxypropyl methyl diethoxy silane. The high-performance chinlon prepared by the invention not only has excellent toughness and wear resistance, but also keeps good mechanical strength and stability.

Description

Technical Field

[0001] The invention belongs to the technical field of composite materials, and in particular relates to a toughened and wear-resistant high-performance nylon and a preparation method thereof. Background Art

[0002] As one of the world's earliest industrialized synthetic fibers, nylon has become a key material in the civilian, industrial, and medical sectors due to its excellent mechanical properties and wide range of applications. Nylon, also known as nylon, is a polyamide fiber. The amide bonds in its molecular chain give nylon excellent abrasion resistance, high breaking strength, and elasticity, making it a dominant material in applications such as clothing, ropes, seat belts, and tire cord. However, nylon's heat and light resistance have long been technical bottlenecks. Long-term exposure to high temperatures or ultraviolet light can easily lead to yellowing and embrittlement of the fiber. Furthermore, while nylon has better hygroscopicity than polyester, its air permeability is poor and it is prone to static electricity generated by friction, limiting its application in high-end functional fabrics. Although some properties of nylon have been improved in recent years through copolymerization modification and nano-reinforcement, further enhancing its toughness and wear resistance while maintaining its lightweight and high strength advantages remains a hot topic in industry research. With the rapid development of industries such as aerospace and automotive lightweighting, the demand for high-performance nylon is becoming increasingly urgent, making technological innovation in nylon production processes an inevitable trend.

[0003] Currently, the production process for nylon is still primarily based on melt spinning, supplemented by solution polymerization and wet spinning techniques. These traditional processes have the following drawbacks: the polymerization stage requires high temperature and pressure, resulting in high energy consumption and the potential for molecular chain degradation, affecting fiber uniformity; improper control of the draw ratio and cooling rate during spinning can lead to uneven stress distribution within the fiber, reducing mechanical properties; and the post-processing stage relies on chemical reagents or high-temperature heat setting, which not only increases production costs but also may generate environmental pollutants. Furthermore, existing nylon products generally suffer from insufficient low- and high-temperature resistance, prone to brittle fracture at low temperatures and a sharp drop in strength at high temperatures due to the low glass transition temperature. Furthermore, nylon is susceptible to aging due to oxidation or UV exposure over long-term use. While its abrasion resistance is superior to that of natural fibers, it still struggles to meet high-performance requirements under high-friction conditions. These process and material limitations have severely restricted the expansion of nylon's application in high-end equipment, precision electronics, and other fields.

[0004] To address the above issues, researchers have attempted to improve the performance of nylon through structural design and modification techniques. For example, the introduction of a porous hollow core structure can enhance the heat storage and fluffiness of the fiber, but the uneven distribution of the pores can easily lead to fluctuations in mechanical properties; the use of composite cross-section designs such as two-component fibers can optimize elasticity and flexibility, but the process complexity is significantly increased; surface hydrophobic treatment or fleece modification can improve antistatic and warmth retention, but it is difficult to achieve both wear resistance and mechanical strength. In addition, although the existing nanomaterial doping process can improve the heat resistance of nylon, the poor dispersion and compatibility of nanomaterials still need to be overcome. Although some technologies have been applied on a small scale, they generally have problems such as high cost, poor process adaptability or limited performance improvement. Therefore, there is an urgent need to develop a high-performance nylon and preparation method that combines toughening and wear resistance, so as to solve the problems of insufficient stability and single function of existing nylon materials in extreme application environments, so as to meet the diversified needs of emerging high-end industries for fiber materials. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preparing toughened and wear-resistant high-performance nylon, by adding a specific toughening modifier and a high-temperature resistant additive to PA resin, thereby effectively improving the toughness, wear resistance and high-temperature stability of nylon.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a toughened and wear-resistant high-performance nylon, which comprises the following raw materials in parts by weight:

[0008] 50-150 parts of PA resin, 2-8 parts of toughening modifier, 1-5 parts of high temperature resistant additive, 0.2-0.8 parts of antioxidant, 1-2 parts of lubricant.

[0009] Preferably, the preparation method of the toughening modifier comprises the following steps:

[0010] Carboxylated graphene and 3-glycidyloxypropylmethyldiethoxysilane are added to anhydrous ethanol and ultrasonicated, 4-aminobenzoic acid is added and heated with stirring to obtain a graphene dispersion; EPDM-grafted maleic anhydride, an antioxidant, and N,N-dimethylcyclohexylamine are added to xylene and heated with stirring, dicumyl peroxide is added and stirred for reaction, the temperature is lowered, the graphene dispersion is added and continued to be stirred, rotary evaporation is performed, and drying is performed to obtain a toughening modifier.

[0011] The present invention adopts the toughening modifier prepared by the above method, wherein the EPDM core preferentially deforms under impact load, inducing the matrix PA to form a shear yield band, dissipating the impact energy through silver crazing and shear band mechanisms, and its maleic anhydride group forms a hydrogen bond network with the PA amide group, thereby enhancing the interfacial bonding force between the two phases and avoiding the mechanical performance degradation caused by interface weakening in traditional elastomer toughening; the graphene shell is bridged by 4-aminobenzoic acid to form a covalent bond interface, which efficiently transfers stress to the rigid shell, and its sp 2 During the impact process, the hybrid structure consumes additional energy through the lamellar pull-out effect and crack deflection mechanism, while forming a directional transfer film at the friction interface, reducing the friction coefficient and inhibiting the expansion of microcracks. In addition, the EPDM flexible segment reduces fatigue damage caused by friction and wear by absorbing micro-vibration energy and buffering stress concentration; 3-glycidyloxypropylmethyldiethoxysilane migrates to the wear area at high temperature, and forms a Si-O-Si cross-linked network with graphene and the matrix through the epoxy group, filling microcracks and repairing interface defects in real time, significantly reducing the wear rate. Ultimately, the present invention uses the synergistic system of EPDM's elastic dissipation, graphene's rigidity reinforcement, and silane coupling agent's interface repair to significantly improve the impact strength and reduce the wear rate of nylon while maintaining high tensile strength.

[0012] Preferably, the weight ratio of the carboxylated graphene, 3-glycidyloxypropylmethyldiethoxysilane, and 4-aminobenzoic acid is 3-5:0.4-0.6:0.4-0.6.

[0013] Preferably, the weight ratio of the carboxylated graphene, 3-glycidyloxypropylmethyldiethoxysilane, and 4-aminobenzoic acid is 3.5:0.5:0.5.

[0014] Preferably, the weight ratio of the EPDM grafted maleic anhydride, antioxidant, N,N-dimethylcyclohexylamine, and dicumyl peroxide is 10-20:0.03-0.08:0.05-0.12:0.05-0.12.

[0015] Preferably, the weight ratio of the EPDM grafted maleic anhydride, antioxidant, N,N-dimethylcyclohexylamine, and dicumyl peroxide is 15:0.05:0.1:0.1.

[0016] Preferably, the weight ratio of the carboxylated graphene to the EPDM grafted maleic anhydride is 3-8:10-20.

[0017] Preferably, the weight ratio of the carboxylated graphene to the EPDM grafted maleic anhydride is 3.5:15.

[0018] Preferably, the preparation method of the toughening modifier comprises the following steps:

[0019] By weight, 3-5 parts of carboxylated graphene and 0.4-0.6 parts of 3-glycidyloxypropylmethyldiethoxysilane were added to 50-80 parts of anhydrous ethanol, ultrasonicated for 10-20 minutes, and then 0.4-0.6 parts of 4-aminobenzoic acid were added. The pH was adjusted to 6.0-6.5, and stirred at 60-70°C and 400-600 rpm for 10-30 minutes to obtain a graphene dispersion. 10-20 parts of EPDM grafted maleic anhydride and 0. 0.3-0.08 parts of antioxidant and 0.05-0.12 parts of N,N-dimethylcyclohexylamine are added to 70-90 parts of xylene, and stirred at 70-80°C, 400-600rpm, and nitrogen protection for 0.5-1h. Then, 0.05-0.12 parts of dicumyl peroxide are added and stirred for 1-2h. The temperature is lowered to 60-65°C, and the above-mentioned graphene dispersion is added and stirred for 1-3h. The solvent is recovered by rotary evaporation at 60-65°C and vacuum dried to obtain a toughening modifier.

[0020] Preferably, the ultrasound has a frequency of 20-40 kHz and a power of 300-500 W.

[0021] Preferably, the antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1-3:1.

[0022] Preferably, the carboxylated graphene has a sheet diameter of 1-5 μm, a thickness of 0.8-1.2 nm, and a carboxyl content of 5.0 wt%.

[0023] Preferably, the grafting rate of the EPDM grafted with maleic anhydride is ≥0.8%.

[0024] Preferably, the high temperature resistant additive is composed of boron nitride nanosheets, aluminum borate whiskers, calcium stearate and 3-glycidyloxypropylmethyldiethoxysilane.

[0025] Preferably, the high temperature resistant additive is prepared by ball milling boron nitride nanosheets, aluminum borate whiskers, calcium stearate and 3-glycidyloxypropylmethyldiethoxysilane in a weight ratio of 1:1-2:0.5-0.8:0.2-0.5.

[0026] The present invention adopts the above-mentioned combination of high-temperature resistant additives to achieve a significant improvement in the thermal stability of nylon through the synergistic effect of multiple components. The layered structure of the boron nitride nanosheets forms a physical barrier in the matrix, accelerates heat dispersion through the heat conduction network, reduces local temperature rise and delays thermal degradation. Its high thermal conductivity can quickly transfer heat to the material surface, avoiding local overheating and molecular chain breakage; aluminum borate whiskers maintain structural integrity at high temperatures, provide physical support and absorb thermal stress, and their aspect ratio forms a bridging effect in the matrix, preventing crack propagation and inhibiting thermoplastic deformation; 3-glycidyloxypropylmethyldiethoxysilane reacts with the hydroxyl groups of the boron nitride nanosheets through epoxy groups, and calcium stearate modifies the whisker surface through metal ion coordination. The two together optimize the filler dispersibility and enhance the interfacial bonding strength, avoiding the stress concentration problem caused by agglomeration of traditional fillers. In addition, the addition of calcium stearate further regulates the surface polarity of the filler, reduces the interfacial tension, and promotes the compatibility of the filler with the PA matrix, thereby maintaining the tensile strength from being negatively affected by the introduction of the filler; the rigid properties of boron nitride nanosheets and whiskers can form a wear-resistant protective film during friction, reducing fiber wear, and ensuring a balance between tensile strength and wear resistance while increasing the heat deformation temperature.

[0027] Preferably, the boron nitride nanosheets have a diameter of 1-2 μm and a thickness of 4-10 nm.

[0028] Preferably, the aluminum borate whiskers have a length of 10-60 μm, a diameter of 0.3-3 μm, and an aspect ratio of 20-80.

[0029] Preferably, the ball milling speed is 500-800 rpm and the time is 1-2 h.

[0030] Preferably, the ball milling medium is a zirconia grinding ball with a diameter of 1-3 mm, and the ball-to-material ratio is 7-10:1.

[0031] Preferably, the PA resin is at least one of PA6, PA66, PA1012, PA610, and PA612.

[0032] Preferably, the lubricant is at least one of zinc stearate, silicone powder, polyethylene wax, paraffin, and n-butyl stearate.

[0033] Preferably, the lubricant is composed of zinc stearate and silicone powder in a weight ratio of 1:2-4.

[0034] Preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant 616, antioxidant 1076, and antioxidant DLTDP.

[0035] Preferably, the antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1-3:1.

[0036] The present invention also provides a method for preparing the above-mentioned toughened and wear-resistant high-performance nylon, comprising the following steps:

[0037] PA resin, toughening modifier, high temperature resistant additive, antioxidant and lubricant are weighed according to the raw material formula, then put into a high-speed mixer for mixing, and then transferred into a twin-screw extruder for melt blending, extrusion and granulation to obtain the toughened and wear-resistant high-performance nylon.

[0038] Preferably, the rotation speed of the high-speed mixer is 200-400 rpm, and the mixing time is 10-20 min.

[0039] Preferably, the extrusion process parameters are: extrusion temperature of 200-240° C., and screw speed of 100-300 rpm.

[0040] Preferably, the extrusion process parameters are: zone 1 temperature 205-210°C, zone 2 temperature 220-225°C, zone 3 temperature 225-230°C, zone 4 temperature 230-235°C, and screw speed 200-250rpm.

[0041] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0042] 1. The present invention provides a method for preparing toughened, wear-resistant, high-performance nylon. The method comprises adding a specific toughening modifier and a high-temperature resistant additive to PA resin. The toughening modifier is made of carboxylated graphene and EPDM-grafted maleic anhydride as main raw materials, and the high-temperature resistant additive is composed of boron nitride nanosheets, aluminum borate whiskers, calcium stearate, and 3-glycidyloxypropylmethyldiethoxysilane. The toughness, wear resistance, and high-temperature stability of the nylon are effectively improved, thereby further broadening the application range of the high-performance nylon.

[0043] 2. The present invention adds a self-made toughening modifier to the PA resin matrix. Its EPDM core induces micropores under impact, inducing the PA resin matrix to form a shear yield band, dissipating the impact energy. The graphene shell is bridged by 4-aminobenzoic acid to form a covalent bond interface, ensuring that the stress is efficiently transferred to the rigid shell layer, and through the sheet pull-out effect and crack deflection, additional energy is consumed, so that the impact strength is significantly improved; graphene sp 2 The hybrid structure forms a directional transfer film at the friction interface, the EPDM flexible chain segments absorb micro-vibration energy, and the silane coupling agent migrates to the surface to reconstruct the Si-O-Si network to fill micro-cracks and reduce the wear rate.

[0044] 3. The present invention also adopts a specific combination of high-temperature resistant additives. The layered structure of its boron nitride nanosheets forms a physical barrier in the matrix, accelerates heat dispersion through the heat conduction network, reduces local temperature rise and delays thermal degradation. The high thermal conductivity can quickly transfer heat to the material surface, avoiding local overheating and molecular chain breakage; aluminum borate whiskers maintain structural integrity at high temperatures, provide physical support and absorb thermal stress, and their aspect ratio forms a bridging effect in the matrix, preventing crack propagation and inhibiting thermoplastic deformation; 3-glycidyloxypropylmethyldiethoxysilane reacts with the hydroxyl groups of the boron nitride nanosheets through epoxy groups, and calcium stearate modifies the whisker surface through metal ion coordination. The two together optimize the filler dispersibility and enhance the interfacial bonding strength, avoiding the stress concentration problem caused by agglomeration of traditional fillers. DETAILED DESCRIPTION

[0045] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0046] Some of the raw materials for the embodiments and comparative examples are as follows:

[0047] PA6 chips were purchased from Hunan Yuehua Chemical Co., Ltd. with the brand name YH3400.

[0048] Boron nitride nanosheets were purchased from Suzhou Napu Material Technology Co., Ltd., referred to as NS-BN, with a sheet diameter of 1-2 μm and a thickness of 4-10 nm.

[0049] Aluminum borate whiskers were purchased from Jiangxi Fengzhu New Material Technology Co., Ltd. with the brand name NP-BW2, a length of 10-60 μm, a diameter of 0.3-3 μm, and an aspect ratio of 20-80.

[0050] Carboxylated graphene was purchased from Nanjing Jicang Nanotechnology Co., Ltd., model JCG-1-3-COOH, with a sheet diameter of 1-5 μm, a thickness of 0.8-1.2 nm, and a carboxyl content of 5.0 wt%.

[0051] EPDM grafted maleic anhydride was purchased from Coase Chemical Co., Ltd. with the brand name W1P-2, EPDM-g-MAH, and the grafting rate was ≥0.8%.

[0052] Example 1

[0053] This embodiment provides a toughened and wear-resistant high-performance nylon, which is made of the following raw materials in parts by weight:

[0054] 100 parts PA6 chips, 5 parts toughening modifier, 3 parts high-temperature resistant additive, 0.5 parts antioxidant, and 1.5 parts lubricant. The antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 2:1. The lubricant consists of zinc stearate and silicone powder in a weight ratio of 1:3.

[0055] The high-temperature resistant additive is prepared by ball-milling boron nitride nanosheets, aluminum borate whiskers, calcium stearate, and 3-glycidyloxypropylmethyldiethoxysilane in a weight ratio of 1:1.5:0.6:0.4. The milling speed is 600 rpm for 1.5 hours, the milling medium is 1 mm diameter zirconium oxide grinding balls, and the ball-to-material ratio is 8:1.

[0056] The preparation method of the toughening modifier comprises the following steps:

[0057] By weight, 3.5 parts of carboxylated graphene and 0.5 parts of 3-glycidyloxypropylmethyldiethoxysilane were added to 60 parts of anhydrous ethanol, and ultrasonicated at a frequency of 30 kHz and a power of 350 W for 15 min. Then, 0.5 parts of 4-aminobenzoic acid were added, the pH was adjusted to 6.2, and stirred at 65 ° C and 500 rpm for 20 min to obtain a graphene dispersion; 15 parts of EPDM grafted maleic anhydride and 0.05 parts of anti- An antioxidant and 0.1 part of N,N-dimethylcyclohexylamine were added to 80 parts of xylene, and the antioxidant was composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 2:1. The mixture was stirred at 75°C, 500 rpm and nitrogen protection for 0.5 h, and then 0.1 part of dicumyl peroxide was added and stirred for 1 h. The temperature was lowered to 60°C, and the above-mentioned graphene dispersion was added and continued to stir for 2 h. The solvent was recovered by rotary evaporation at 60°C and vacuum dried to obtain a toughening modifier.

[0058] This embodiment provides a method for preparing toughened and wear-resistant high-performance nylon, comprising the following steps:

[0059] PA6 chips, a toughening modifier, a high-temperature resistant additive, an antioxidant, and a lubricant were weighed according to the raw material formula and mixed in a high-speed mixer at 300 rpm for 15 minutes. The mixture was then transferred to a twin-screw extruder for melt blending and extrusion pelletization to produce the toughened, wear-resistant, high-performance nylon. The extrusion process parameters were: zone 1 temperature of 205°C, zone 2 temperature of 220°C, zone 3 temperature of 225°C, zone 4 temperature of 230°C, and a screw speed of 220 rpm.

[0060] Example 2

[0061] This embodiment provides a toughened and wear-resistant high-performance nylon, which is made of the following raw materials in parts by weight:

[0062] 50 parts PA6 chips, 2 parts toughening modifier, 1 part high-temperature resistant additive, 0.2 parts antioxidant, and 1 part lubricant. The antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1. The lubricant consists of zinc stearate and silicone powder in a weight ratio of 1:2.

[0063] The high-temperature resistant additive is prepared by ball-milling boron nitride nanosheets, aluminum borate whiskers, calcium stearate, and 3-glycidyloxypropylmethyldiethoxysilane in a weight ratio of 1:1:0.5:0.2. The milling speed is 500 rpm for 2 hours, the milling medium is 1 mm diameter zirconium oxide grinding balls, and the ball-to-material ratio is 7:1.

[0064] The preparation method of the toughening modifier is the same as that of Example 1.

[0065] This embodiment provides a method for preparing toughened and wear-resistant high-performance nylon, comprising the following steps:

[0066] PA6 chips, a toughening modifier, a high-temperature resistant additive, an antioxidant, and a lubricant were weighed according to the raw material formula and mixed in a high-speed mixer at 300 rpm for 15 minutes. The mixture was then transferred to a twin-screw extruder for melt blending and extrusion pelletization to produce the toughened, wear-resistant, high-performance nylon. The extrusion process parameters were: zone 1 temperature of 205°C, zone 2 temperature of 220°C, zone 3 temperature of 225°C, zone 4 temperature of 230°C, and a screw speed of 220 rpm.

[0067] Example 3

[0068] This embodiment provides a toughened and wear-resistant high-performance nylon, which is made of the following raw materials in parts by weight:

[0069] 150 parts PA6 chips, 8 parts toughening modifier, 5 parts high-temperature resistant additive, 0.8 parts antioxidant, and 2 parts lubricant. The antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 3:1. The lubricant consists of zinc stearate and silicone powder in a weight ratio of 1:4.

[0070] The high-temperature resistant additive is prepared by ball-milling boron nitride nanosheets, aluminum borate whiskers, calcium stearate, and 3-glycidyloxypropylmethyldiethoxysilane in a weight ratio of 1:2:0.8:0.5. The milling speed is 800 rpm for 1 hour, the milling medium is 1 mm diameter zirconium oxide grinding balls, and the ball-to-material ratio is 10:1.

[0071] The preparation method of the toughening modifier is the same as that of Example 1.

[0072] This embodiment provides a method for preparing toughened and wear-resistant high-performance nylon, comprising the following steps:

[0073] PA6 chips, a toughening modifier, a high-temperature resistant additive, an antioxidant, and a lubricant were weighed according to the raw material formula and mixed in a high-speed mixer at 300 rpm for 15 minutes. The mixture was then transferred to a twin-screw extruder for melt blending and extrusion pelletization to produce the toughened, wear-resistant, high-performance nylon. The extrusion process parameters were: zone 1 temperature of 210°C, zone 2 temperature of 225°C, zone 3 temperature of 230°C, zone 4 temperature of 235°C, and a screw speed of 250 rpm.

[0074] Comparative Example 1

[0075] The difference between this comparative example and Example 1 is that the preparation method of the toughening modifier is different, which is as follows: the preparation method of the toughening modifier comprises the following steps:

[0076] By weight, 3.5 parts of carboxylated graphene were added to 60 parts of anhydrous ethanol, and ultrasonicated at a frequency of 30 kHz and a power of 350 W for 15 minutes to obtain a graphene dispersion; 15 parts of EPDM-grafted maleic anhydride, 0.05 parts of an antioxidant, and 0.1 parts of N,N-dimethylcyclohexylamine were added to 80 parts of xylene, where the antioxidant consisted of antioxidant 1010 and antioxidant 168 in a weight ratio of 2:1. The mixture was stirred at 75°C, 500 rpm, and nitrogen protection for 0.5 hours, and then 0.1 parts of diisopropylbenzene peroxide was added and stirred for 1 hour. The mixture was cooled to 60°C, and the above-mentioned graphene dispersion was added and stirred for 2 hours. The solvent was recovered by rotary evaporation at 60°C and vacuum dried to obtain a toughening modifier.

[0077] Comparative Example 2

[0078] The difference between this comparative example and Example 1 is that the preparation method of the toughening modifier is different, which is as follows: the preparation method of the toughening modifier comprises the following steps:

[0079] By weight, 3.5 parts of carboxylated graphene and 0.5 parts of 3-glycidyloxypropylmethyldiethoxysilane were added to 60 parts of anhydrous ethanol, and ultrasonicated at a frequency of 30 kHz and a power of 350 W for 15 minutes. Then, 0.5 parts of 4-aminobenzoic acid were added, the pH was adjusted to 6.2, and stirred at 65° C. and 500 rpm for 20 minutes to obtain a graphene dispersion. 15 parts of EPDM-grafted maleic anhydride were added to 80 parts of xylene, and then the above-mentioned graphene dispersion was added. The mixture was stirred at 60° C. and 500 rpm for 2 hours, the solvent was recovered by rotary evaporation at 60° C., and vacuum dried to obtain a toughening modifier.

[0080] Comparative Example 3

[0081] The difference between this comparative example and Example 1 is that the preparation method of the toughening modifier is different, specifically as follows: the toughening modifier is prepared by mixing 3.5 parts of carboxylated graphene and 15 parts of EPDM grafted maleic anhydride, by weight.

[0082] Comparative Example 4

[0083] This comparative example differs from Example 1 in that the composition of the high-temperature resistant additive is different. The high-temperature resistant additive is ball-milled from aluminum borate whiskers, calcium stearate, and 3-glycidoxypropylmethyldiethoxysilane in a weight ratio of 1.5:0.6:0.4. The milling speed is 600 rpm for 1.5 hours, the milling medium is 1 mm diameter zirconium oxide balls, and the ball-to-material ratio is 8:1.

[0084] Comparative Example 5

[0085] This comparative example differs from Example 1 in that the composition of the high-temperature resistant additive is different. The high-temperature resistant additive is ball-milled from boron nitride nanosheets, calcium stearate, and 3-glycidoxypropylmethyldiethoxysilane in a weight ratio of 1:0.6:0.4. The milling speed is 600 rpm for 1.5 hours, using 1 mm diameter zirconium oxide balls as the milling medium, and the ball-to-material ratio is 8:1.

[0086] Comparative Example 6

[0087] This comparative example differs from Example 1 in that the composition of the high-temperature resistant additive is different. The high-temperature resistant additive is ball-milled from boron nitride nanosheets, aluminum borate whiskers, and calcium stearate in a weight ratio of 1:1.5:0.6. The milling speed is 600 rpm for 1.5 hours, the milling medium is 1 mm diameter zirconium oxide grinding balls, and the ball-to-material ratio is 8:1.

[0088] Performance Testing

[0089] The toughened and wear-resistant high-performance nylon prepared in Examples 1-3 and Comparative Examples 1-6 was injection molded to obtain standard samples, and various performance tests were performed. The tensile strength was determined according to the method in reference standard GB / T 1040.2-2022; the impact strength (notched) was determined according to the method in reference standard GB / T1843-2008; the abrasion loss was determined according to the method in reference standard ASTM D3884, the grinding wheel was CS-10, the load was 1000g, and the friction was 5000 revolutions; the heat deformation temperature was determined according to the method in reference standard GB / T 1634.2-2019, and the bending stress was 1.8MPa. 8 groups were paralleled in each case, and the average value was taken. The results are shown in Table 1.

[0090] Table 1: Performance test results of high performance nylon

[0091]

[0092]

[0093] Comparison of the above test results shows that the high-performance nylon prepared in Examples 1-3 of the present invention exhibits excellent toughness, wear resistance, tensile strength, and high-temperature stability. In particular, the high-performance nylon prepared in Example 3 exhibits the best overall performance. This is because the present invention significantly enhances the toughness, wear resistance, and high-temperature stability of the nylon by adding specific toughening modifiers and high-temperature resistant additives to the PA matrix resin. Compared to Examples 1-3, since Comparative Examples 1-3 do not utilize a toughening modifier prepared using a specific method, and Comparative Examples 4-6 do not utilize a specific combination of high-temperature resistant additives, the toughness, wear resistance, and high-temperature stability of the nylons obtained are inferior to those of Examples 1-3. This further demonstrates the importance of the technical solutions defined in the present invention for its technical effectiveness.

[0094] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A toughened and wear-resistant high-performance nylon, characterized in that: Calculated by weight, it includes the following raw materials: 50-150 parts of PA resin, 2-8 parts of toughening modifier, 1-5 parts of high-temperature resistant additive, 0.2-0.8 parts of antioxidant, and 1-2 parts of lubricant; the high-temperature resistant additive consists of boron nitride nanosheets, aluminum borate whiskers, calcium stearate, and 3-glycidyloxypropylmethyldiethoxysilane.

2. The toughened and wear-resistant high-performance nylon according to claim 1, characterized in that: The preparation method of the toughening modifier comprises the following steps: Carboxylated graphene and 3-glycidyloxypropylmethyldiethoxysilane are added to anhydrous ethanol and ultrasonicated, 4-aminobenzoic acid is added and heated with stirring to obtain a graphene dispersion; EPDM-grafted maleic anhydride, an antioxidant, and N,N-dimethylcyclohexylamine are added to xylene and heated with stirring, dicumyl peroxide is added and stirred for reaction, the temperature is lowered, the graphene dispersion is added and continued to be stirred, rotary evaporation is performed, and drying is performed to obtain a toughening modifier.

3. The toughened and wear-resistant high-performance nylon according to claim 2, characterized in that: The weight ratio of the carboxylated graphene, 3-glycidyloxypropylmethyldiethoxysilane and 4-aminobenzoic acid is 3-5:0.4-0.6:0.4-0.

6.

4. The toughened and wear-resistant high-performance nylon according to claim 2, characterized in that: The weight ratio of the EPDM grafted maleic anhydride, antioxidant, N,N-dimethylcyclohexylamine and dicumyl peroxide is 10-20:0.03-0.08:0.05-0.12:0.05-0.

12.

5. The toughened and wear-resistant high-performance nylon according to claim 1, characterized in that: The high-temperature resistant auxiliary agent is prepared by ball milling boron nitride nanosheets, aluminum borate whiskers, calcium stearate and 3-glycidyloxypropylmethyldiethoxysilane in a weight ratio of 1:1-2:0.5-0.8:0.2-0.

5.

6. The toughened and wear-resistant high-performance nylon according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant 616, antioxidant 1076, and antioxidant DLTDP.

7. The toughened and wear-resistant high-performance nylon according to claim 6, characterized in that: The antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1-3:

1.

8. The toughened and wear-resistant high-performance nylon according to claim 1, characterized in that: The lubricant is at least one of zinc stearate, silicone powder, polyethylene wax, paraffin wax, and n-butyl stearate.

9. The toughened and wear-resistant high-performance nylon according to claim 8, characterized in that: The lubricant consists of zinc stearate and silicone powder in a weight ratio of 1:2-4.

10. The method for preparing toughened and wear-resistant high-performance nylon according to any one of claims 1 to 9, characterized in that: The steps include: PA resin, toughening modifier, high temperature resistant additive, antioxidant and lubricant are weighed according to the raw material formula, then put into a high-speed mixer for mixing, and then transferred into a twin-screw extruder for melt blending, extrusion and granulation to obtain the toughened and wear-resistant high-performance nylon.

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