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

Abstract

The application provides a toughened wear-resistant high-performance nylon and a preparation method thereof, and belongs to the technical field of composite materials.The toughened wear-resistant high-performance nylon is prepared from the following raw materials in parts by weight: 50-150 parts of PA resin, 2-8 parts of a toughening modifier, 1-5 parts of a high-temperature-resistant additive, 0.2-0.8 parts of an antioxidant, and 1-2 parts of a lubricant; wherein the toughening modifier is prepared from 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 high-performance nylon prepared by the application not only has excellent toughness and wear resistance, but also maintains good mechanical strength and stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of composite materials, and particularly relates to a toughened and wear-resistant high-performance nylon and a preparation method thereof. BACKGROUND

[0002] Nylon, also known as polyamide fiber, is one of the earliest synthetic fibers to be industrialized in the world. Due to its excellent mechanical properties and wide application scenarios, it has become an important material in the fields of civil, industrial and medical. Nylon has good wear resistance, high breaking strength and elasticity due to the amide bond in its molecular chain, making it dominant in applications such as clothing, ropes, safety belts, tire cords, etc. However, the heat resistance and light resistance of nylon have always been its technical bottlenecks, and long-term exposure to high temperatures or ultraviolet light can easily cause the fiber to yellow and become brittle. In addition, although the moisture absorption of nylon is better than that of polyester, its air permeability is poor, and it is easy to generate static electricity due to friction, which limits its application in high-end functional fabrics. Although in recent years the performance of nylon has been improved through copolymerization modification and nano-enhancement, how to further enhance the toughness and wear resistance while maintaining its lightweight and high-strength advantages is still a hot topic in the industry. With the rapid development of aerospace, automotive lightweighting and other fields, the demand for high-performance nylon is increasingly urgent, and technological innovation in nylon preparation processes has become an inevitable trend.

[0003] Currently, the preparation process of nylon is still mainly melt spinning, supplemented by solution polymerization, wet spinning and other technologies. These traditional processes have the following defects: high temperature and high pressure conditions are required in the polymerization stage, which consumes a lot of energy and easily leads to molecular chain degradation, affecting the uniformity of the fiber; improper control of the draw ratio and cooling rate during the spinning process can easily cause uneven stress distribution in the fiber, reducing the mechanical properties; the post-processing stage relies on chemical reagents or high-temperature heat setting, which not only increases production costs, but also may produce environmental pollutants. In addition, existing nylon products generally have insufficient low / high temperature resistance, which can easily cause brittle fracture in low temperature environments, and a sharp drop in strength in high temperature environments due to low glass transition temperature. In addition, nylon is prone to aging due to oxidation or ultraviolet radiation during long-term use, and although its wear resistance is better than that of natural fibers, it still cannot meet the high performance requirements in high friction conditions. These limitations in process and material performance have seriously restricted the application of nylon in high-end equipment, precision electronics and other fields.

[0004] To solve the above problems, researchers try to improve the performance of nylon by structural design and modification technology. For example, the introduction of porous hollow structure can enhance the heat storage and bulkiness of the fiber, but uneven distribution of holes can easily lead to mechanical property fluctuation; the use of composite cross-section design such as bicomponent fiber can optimize elasticity and flexibility, but the process complexity increases significantly; surface hydrophobic treatment or raising modification can improve the antistatic and warmth, but it is difficult to balance the wear resistance and mechanical strength. In addition, although the existing nanomaterial doping process can improve the heat resistance of nylon, the dispersion and compatibility of nanomaterials still need to be broken through. Although some technologies have realized small-scale application, there are still problems such as high cost, poor process adaptability or limited performance improvement. Therefore, it is urgent to develop a high-performance nylon with toughening and wear-resistant properties and a preparation method, so as to solve the problems of insufficient stability and single function of existing nylon materials in extreme application environment, and meet the diversified demand of emerging high-end industries for fiber materials. SUMMARY

[0005] The purpose of the present application is to provide a preparation method of high-performance nylon with toughening and wear resistance, which effectively improves the toughness, wear resistance and high-temperature stability of nylon by adding specific toughening modifier and high-temperature resistant auxiliary agent in PA resin.

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

[0007] The present application provides a high-performance nylon with toughening and wear resistance, which comprises the following raw materials by weight:

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

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

[0010] Carboxylated graphene, 3-glycidyl ether oxypropyl methyl diethoxysilane, 4-aminobenzoic acid, EPDM grafted maleic anhydride, antioxidant, N,N-dimethylcyclohexylamine, dicumyl peroxide, graphene dispersion, stirring, drying, and toughening modifier are added.

[0011] The toughening modifier prepared by the method has the advantages that: the EPDM core deforms preferentially under impact load, inducing the matrix PA to form a shear yield zone, and the impact energy is dissipated through crazing and shear band mechanism; the maleic anhydride groups form a hydrogen bond network with the PA amide groups, enhancing the interfacial bonding force between the two phases, and avoiding the mechanical property decline caused by weak interface in traditional elastomer toughening; the graphene shell layer is bridged by 4-aminobenzoic acid to form a covalent bond interface, and the stress is efficiently transmitted to the rigid shell layer, and the sp 2 The hybrid structure additionally consumes energy through the effect of flake pulling out and the crack deflection mechanism during impact, and forms a directional transfer film on the friction interface, reduces the friction coefficient and inhibits the expansion of microcracks. In addition, the EPDM flexible segment reduces the fatigue damage caused by friction and wear by absorbing micro-vibration energy and buffering stress concentration; the 3-glycidyloxypropylmethyldiethoxysilane migrates to the wear area at high temperature, forms a Si-O-Si crosslinking network with graphene and the matrix through the epoxy group, and fills the microcracks and repairs the interface defects in real time, thereby significantly reducing the wear rate. Finally, the synergistic system of the elastic dissipation of EPDM, the rigid reinforcement of graphene and the interface repair of silane coupling agent can significantly improve the impact strength and reduce the wear rate of the polyamide 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 and the EPDM grafted maleic anhydride is 3-8:10-20.

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

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

[0019] Add 3-5 parts of carboxylated graphene, 0.4-0.6 parts of 3-glycidyloxypropylmethyldiethoxysilane into 50-80 parts of anhydrous ethanol, ultrasonic for 10-20 min, then add 0.4-0.6 parts of 4-aminobenzoic acid, pH to 6.0-6.5, stirring at 60-70℃, 400-600 rpm for 10-30 min, to obtain graphene dispersion; add 10-20 parts of EPDM grafted maleic anhydride, 0.03-0.08 parts of antioxidant, 0.05-0.12 parts of N,N-dimethylcyclohexylamine into 70-90 parts of xylene, stirring at 70-80℃, 400-600 rpm, under nitrogen protection for 0.5-1 h, then add 0.05-0.12 parts of dicumyl peroxide and stir for 1-2 h, cool to 60-65℃, add the above graphene dispersion and continue stirring for 1-3 h, rotary evaporation to recover the solvent at 60-65℃, vacuum drying to obtain the toughening modifier.

[0020] Preferably, the frequency of the ultrasonic is 20-40 kHz, and the power is 300-500 W.

[0021] Preferably, the antioxidant is composed 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 maleic anhydride is ≥0.8%.

[0024] Preferably, the high-temperature-resistant auxiliary agent is composed of boron nitride nanosheet, aluminum borate whisker, calcium stearate, and 3-glycidyloxypropylmethyldiethoxysilane.

[0025] Preferably, the high-temperature-resistant auxiliary agent is composed of boron nitride nanosheet, aluminum borate whisker, calcium stearate, and 3-glycidyloxypropylmethyldiethoxysilane in a weight ratio of 1:1-2:0.5-0.8:0.2-0.5.

[0026] The application adopts the high-temperature-resistant auxiliary agent in the combination, and through the synergistic effect of multiple components, the heat stability of the polyamide is significantly improved. The layered structure of the boron nitride nanosheet forms a physical barrier in the matrix, accelerates heat dispersion through a heat conduction network, reduces local temperature rise and delays thermal degradation. The high thermal conductivity of the boron nitride nanosheet can quickly transfer heat to the material surface, avoiding local overheating and causing molecular chain rupture. The aluminum borate whisker maintains structural integrity at high temperature, provides physical support and absorbs thermal stress. The aspect ratio of the aluminum borate whisker forms a bridging effect in the matrix, preventing crack propagation and inhibiting thermal plastic deformation. The 3-glycidyloxypropylmethyldiethoxysilane reacts with the hydroxyl group of the boron nitride nanosheet through the epoxy group, and the calcium stearate modifies the whisker surface through metal ion coordination. The two together optimize the dispersion of the filler and enhance the interfacial bonding force, avoiding the stress concentration problem caused by the agglomeration of traditional fillers. In addition, the addition of calcium stearate further adjusts the surface polarity of the filler, reduces the interfacial tension, and promotes the compatibility of the filler and the PA matrix, thereby maintaining the tensile strength without being negatively affected by the introduction of the filler. The rigidity of the boron nitride nanosheet and the whisker can form a wear-resistant protective film during friction, reducing fiber wear, improving the heat distortion temperature, and ensuring the balance of tensile strength and wear resistance.

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

[0028] Preferably, the aluminum borate whisker has 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 zirconium oxide 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 consists 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 application further provides a preparation method of the high-performance nylon with toughness and wear resistance.

[0037] The PA resin, the toughening modifier, the high-temperature-resistant auxiliary agent, the antioxidant and the lubricant are weighed according to the raw material formula, mixed in a high-speed mixer, and then transferred into a double-screw extruder for melt blending, extrusion and granulation, so that the high-performance nylon with toughness and wear resistance is obtained.

[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 as follows: the extrusion temperature is 200-240 DEG C, and the screw rotation speed is 100-300 rpm.

[0040] Preferably, the extrusion process parameters are as follows: the temperature of the first zone is 205-210 DEG C, the temperature of the second zone is 220-225 DEG C, the temperature of the third zone is 225-230 DEG C, the temperature of the fourth zone is 230-235 DEG C, and the screw rotation speed is 200-250 rpm.

[0041] Compared with the prior art, the application has the following advantages and beneficial effects:

[0042] 1. The application provides a preparation method of high-performance nylon with toughness and wear resistance.

[0043] 2. The application adds the self-prepared toughening modifier in the PA resin matrix. 2 The hybrid structure forms a directional transfer film on the friction interface, the EPDM flexible chain segment absorbs micro-vibration energy, the silane coupling agent migrates to the surface to recombine the Si-O-Si network to fill the micro-cracks, and the wear rate is reduced.

[0044] 3、The application also adopts a specific combination of high-temperature resistant auxiliary agents. The layered structure of the boron nitride nanosheet forms a physical barrier in the matrix, accelerates heat dispersion through a heat conduction network, reduces local temperature rise and delays thermal degradation. The high thermal conductivity can quickly transfer heat to the surface of the material to avoid local overheating and cause molecular chain rupture. The aluminum borate whisker maintains structural integrity at high temperatures, provides physical support and absorbs thermal stress. The aspect ratio of the whisker forms a bridging effect in the matrix, preventing crack propagation and inhibiting thermal plastic deformation. The 3-glycidyloxypropylmethyldiethoxysilane reacts with the hydroxyl group of the boron nitride nanosheet through the epoxy group, and the calcium stearate modifies the whisker surface through metal ion coordination. Both of them optimize the dispersion of fillers and enhance the interfacial bonding force to avoid the stress concentration problem caused by the agglomeration of traditional fillers. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

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

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

[0048] Boron nitride nanosheets were purchased from Suzhou Napo Material Technology Co., Ltd., abbreviated as NS-BN, with a flake 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 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., with the model JCG-1-3-COOH, a flake 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 Kaoes Chemical Co., Ltd., with the brand W1P-2, EPDM-g-MAH, and a grafting rate ≥0.8%.

[0052] Example 1

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

[0054] 100 parts of PA6 chip, 5 parts of toughening modifier, 3 parts of high-temperature-resistant auxiliary agent, 0.5 parts of antioxidant, and 1.5 parts of lubricant. The antioxidant is composed of antioxidant 1010 and antioxidant 168 at a weight ratio of 2:1. The lubricant is composed of zinc stearate and silicone powder at a weight ratio of 1:3.

[0055] The high-temperature-resistant auxiliary agent is obtained by ball milling boron nitride nanosheets, aluminum borate whiskers, calcium stearate, and 3-glycidyloxypropylmethyldiethoxysilane at a weight ratio of 1:1.5:0.6:0.4. The ball milling speed is 600 rpm, the ball milling time is 1.5 h, the ball milling medium is zirconium oxide grinding ball with a diameter of 1 mm, and the ball-to-material ratio is 8:1.

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

[0057] According to weight parts, 3.5 parts of carboxylated graphene, 0.5 parts of 3-glycidyloxypropylmethyldiethoxysilane are added into 60 parts of anhydrous ethanol, ultrasonic is performed at a frequency of 30 kHz and a power of 350 W for 15 min, then 0.5 parts of 4-aminobenzoic acid is added, the pH is adjusted to 6.2, and stirring is performed at 65℃ and 500 rpm for 20 min to obtain a graphene dispersion liquid; 15 parts of EPDM grafted maleic anhydride, 0.05 parts of antioxidant, and 0.1 parts of N,N-dimethylcyclohexylamine are added into 80 parts of xylene, the antioxidant is composed of antioxidant 1010 and antioxidant 168 at a weight ratio of 2:1, stirring is performed at 75℃, 500 rpm, and under nitrogen protection for 0.5 h, then 0.1 parts of dicumyl peroxide is added and stirring is performed for 1 h, the temperature is reduced to 60℃, the graphene dispersion liquid is continuously added and stirring is performed for 2 h, the solvent is recovered by rotary evaporation at 60℃, and vacuum drying is performed to obtain the toughening modifier.

[0058] The embodiment provides a preparation method of toughened and wear-resistant high-performance nylon, which comprises the following steps:

[0059] According to the raw material formula, PA6 chip, toughening modifier, high-temperature-resistant auxiliary agent, antioxidant, and lubricant are weighed and put into a high-speed mixer to mix at 300 rpm for 15 min, and then are put into a twin-screw extruder to melt blend, extrude, and granulate to obtain the toughened and wear-resistant high-performance nylon. The extrusion process parameters are as follows: the temperature of the first zone is 205℃, the temperature of the second zone is 220℃, the temperature of the third zone is 225℃, the temperature of the fourth zone is 230℃, and the screw rotation speed is 220 rpm.

[0060] Example 2

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

[0062] 50 parts of PA6 chip, 2 parts of toughening modifier, 1 part of high-temperature-resistant auxiliary agent, 0.2 parts of antioxidant, 1 part of lubricant. The antioxidant is composed of antioxidant 1010 and antioxidant 168 at a weight ratio of 1:1. The lubricant is composed of zinc stearate and silicone powder at a weight ratio of 1:2.

[0063] The high-temperature-resistant auxiliary agent is ball-milled from boron nitride nanosheet, aluminum borate whisker, calcium stearate and 3-glycidyloxypropylmethyldiethoxysilane at a weight ratio of 1:1:0.5:0.2. The ball-milling speed is 500 rpm, the ball-milling time is 2 h, the ball-milling medium is zirconium oxide grinding ball with a diameter of 1 mm, and the ball-to-material ratio is 7:1.

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

[0065] The embodiment provides a preparation method of toughened and wear-resistant high-performance nylon, which comprises the following steps:

[0066] PA6 chip, toughening modifier, high-temperature-resistant auxiliary agent, antioxidant and lubricant are weighed according to the raw material formula, and then are put into a high-speed mixer to be mixed at 300 rpm for 15 min, and then are transferred into a double-screw extruder to be melt-blended, extruded and granulated, so that the toughened and wear-resistant high-performance nylon is obtained. The extrusion process parameters are as follows: the temperature of a first zone is 205 DEG C, the temperature of a second zone is 220 DEG C, the temperature of a third zone is 225 DEG C, the temperature of a fourth zone is 230 DEG C, and the screw rotation speed is 220 rpm.

[0067] Embodiment 3

[0068] The 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 of PA6 chip, 8 parts of toughening modifier, 5 parts of high-temperature-resistant auxiliary agent, 0.8 parts of antioxidant and 2 parts of lubricant. The antioxidant is composed of antioxidant 1010 and antioxidant 168 at a weight ratio of 3:1. The lubricant is composed of zinc stearate and silicone powder at a weight ratio of 1:4.

[0070] The high-temperature-resistant auxiliary agent is ball-milled from boron nitride nanosheet, aluminum borate whisker, calcium stearate and 3-glycidyloxypropylmethyldiethoxysilane at a weight ratio of 1:2:0.8:0.5. The ball-milling speed is 800 rpm, the ball-milling time is 1 h, the ball-milling medium is zirconium oxide grinding ball with a diameter of 1 mm, and the ball-to-material ratio is 10:1.

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

[0072] The embodiment provides a preparation method of toughened and wear-resistant high-performance nylon, which comprises the following steps:

[0073] The PA6 chip, toughening modifier, high-temperature-resistant auxiliary agent, antioxidant and lubricant are weighed according to the raw material formula, then are put into a high-speed mixer to mix for 15 min at 300 rpm, and then are put into a twin-screw extruder to melt blend, extrude and granulate, so as to obtain the toughened and wear-resistant high-performance polyamide. The extrusion process parameters are as follows: the temperature of the first zone is 210 DEG C, the temperature of the second zone is 225 DEG C, the temperature of the third zone is 230 DEG C, the temperature of the fourth zone is 235 DEG C, and the screw rotation speed is 250 rpm.

[0074] Comparative Example 1

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

[0076] According to weight parts, 3.5 parts of carboxylated graphene are added into 60 parts of anhydrous ethanol, and ultrasonic treatment is performed at a frequency of 30 kHz and a power of 350 W for 15 min to obtain a graphene dispersion liquid; 15 parts of EPDM grafted maleic anhydride, 0.05 parts of antioxidant and 0.1 parts of N, N-dimethylcyclohexylamine are added into 80 parts of xylene, the antioxidant is composed of antioxidant 1010 and antioxidant 168 at a weight ratio of 2:1, stirring is performed at 75 DEG C, 500 rpm and under nitrogen protection for 0.5 h, then 0.1 parts of dicumyl peroxide is added and stirring reaction is performed for 1 h, the temperature is lowered to 60 DEG C, the graphene dispersion liquid is continuously added and stirring is performed for 2 h, the solvent is recovered by rotary evaporation at 60 DEG C, and vacuum drying is performed to obtain the toughening modifier.

[0077] Comparative Example 2

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

[0079] According to weight parts, 3.5 parts of carboxylated graphene and 0.5 parts of 3-glycidyloxypropylmethyldiethoxysilane are added into 60 parts of anhydrous ethanol, and ultrasonic treatment is performed at a frequency of 30 kHz and a power of 350 W for 15 min, then 0.5 parts of 4-aminobenzoic acid is added, the pH is adjusted to 6.2, and stirring is performed at 65 DEG C and 500 rpm for 20 min to obtain a graphene dispersion liquid; 15 parts of EPDM grafted maleic anhydride is added into 80 parts of xylene, then the graphene dispersion liquid is added, and stirring is performed at 60 DEG C and 500 rpm for 2 h, the solvent is recovered by rotary evaporation at 60 DEG C, and vacuum drying is performed to obtain the toughening modifier.

[0080] Comparative Example 3

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

[0082] Comparative Example 4

[0083] The difference between the present comparative example and Example 1 is that the composition of the high-temperature-resistant adjuvant is different, and the high-temperature-resistant adjuvant is ball-milled from aluminum borate whiskers, calcium stearate and 3-glycidyloxypropylmethyldiethoxysilane at a weight ratio of 1.5:0.6:0.4. Among them, the ball-milling speed is 600 rpm, the time is 1.5 h, the ball-milling medium is zirconia grinding ball with a diameter of 1 mm, and the ball-to-material ratio is 8:1.

[0084] Comparative Example 5

[0085] The difference between the present comparative example and Example 1 is that the composition of the high-temperature-resistant adjuvant is different, and the high-temperature-resistant adjuvant is ball-milled from boron nitride nanosheets, calcium stearate and 3-glycidyloxypropylmethyldiethoxysilane at a weight ratio of 1:0.6:0.4. Among them, the ball-milling speed is 600 rpm, the time is 1.5 h, the ball-milling medium is zirconia grinding ball with a diameter of 1 mm, and the ball-to-material ratio is 8:1.

[0086] Comparative Example 6

[0087] The difference between the present comparative example and Example 1 is that the composition of the high-temperature-resistant adjuvant is different, and the high-temperature-resistant adjuvant is ball-milled from boron nitride nanosheets, aluminum borate whiskers and calcium stearate at a weight ratio of 1:1.5:0.6. Among them, the ball-milling speed is 600 rpm, the time is 1.5 h, the ball-milling medium is zirconia grinding ball with a diameter of 1 mm, and the ball-to-material ratio is 8:1.

[0088] Performance test

[0089] The standard samples of the toughened and wear-resistant high-performance nylon prepared in Examples 1-3 and Comparative Examples 1-6 were injection molded, and various performance tests were carried out. The tensile strength was determined according to the method in the standard GB / T 1040.2-2022; the impact strength (notched) was determined according to the method in the standard GB / T1843-2008; the abrasion amount was determined according to the method in the standard ASTM D3884, the grinding wheel was CS-10, the load was 1000 g, and the friction was 5000 revolutions; the heat distortion temperature was determined according to the method in the standard GB / T 1634.2-2019, the bending stress was 1.8 MPa. Each example was repeated 8 times, 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] It can be known from the comparison of the test results that the high-performance nylon prepared in Examples 1-3 has excellent toughness, wear resistance, tensile strength and high-temperature stability, and in particular, the high-performance nylon prepared in Example 3 has the best comprehensive performance. This is because the toughness, wear resistance and high-temperature stability of the nylon are significantly improved by adding specific toughening modifiers and high-temperature resistant additives to the PA base resin. Compared with Examples 1-3, the toughness, wear resistance and high-temperature stability of the nylon prepared in Comparative Examples 1-3 are poorer than those of Examples 1-3 because the toughening modifiers prepared by the specific method are not used in Comparative Examples 1-3, and the high-temperature resistant additives prepared by the specific combination are not used in Comparative Examples 4-6, which further proves the importance of the technical solutions defined in the application to the technical effects.

[0094] The above is the preferred embodiment of the application. It should be pointed out that for ordinary skilled persons in the art, several improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A toughened and wear-resistant high-performance nylon, characterized in that, By weight, it includes the following ingredients: 50-150 parts PA resin, 2-8 parts toughening modifier, 1-5 parts high-temperature resistant additive, 0.2-0.8 parts antioxidant, and 1-2 parts lubricant; the high-temperature resistant additive is composed of boron nitride nanosheets, aluminum borate whiskers, calcium stearate, and 3-glycidyl etheroxypropylmethyldiethoxysilane. The preparation method of the toughening modifier includes the following steps: Carboxylated graphene and 3-glycidyl etheroxypropylmethyldiethoxysilane were added to anhydrous ethanol and sonicated. 4-aminobenzoic acid was added and the mixture was heated and stirred to obtain a graphene dispersion. EPDM grafted with maleic anhydride, antioxidant, and N,N-dimethylcyclohexylamine were added to xylene and heated and stirred. Dicumyl peroxide was added and stirred to react. The mixture was cooled, and the graphene dispersion was added and stirred continuously. The mixture was then rotary evaporated and dried to obtain a toughening modifier. The weight ratio of the carboxylated graphene, 3-glycidyl etheroxypropylmethyldiethoxysilane, and 4-aminobenzoic acid is 3-5:0.4-0.6:0.4-0.

6.

2. The toughened and wear-resistant high-performance nylon according to claim 1, characterized in that, The weight ratio of the EPDM grafted with maleic anhydride, antioxidant, N,N-dimethylcyclohexylamine, and dicumyl peroxide is 10-20:0.03-0.08:0.05-0.12:0.05-0.

12.

3. The toughened and wear-resistant high-performance nylon according to claim 1, characterized in that, The high-temperature resistant additive is ball-milled from boron nitride nanosheets, aluminum borate whiskers, calcium stearate, and 3-glycidyl etheroxypropylmethyldiethoxysilane in a weight ratio of 1:1-2:0.5-0.8:0.2-0.

5.

4. 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.

5. The toughened and wear-resistant high-performance nylon according to claim 4, characterized in that, The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 1-3:

1.

6. 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.

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

8. The method for preparing toughened and wear-resistant high-performance nylon according to any one of claims 1-7, characterized in that, Includes the following steps: 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 to a twin-screw extruder for melt blending, extrusion granulation, to obtain the toughened and wear-resistant high-performance nylon.

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