Composite elastomer for high-wear-resistance spiral spring power line

Abstract

The invention discloses a composite elastomer for a high-wear-resistance spiral spring power line. The composite elastomer comprises the following components in parts by mass: 50-70 parts of a basic elastomer; 5 to 15 parts of nano composite filler; 10 to 20 parts of aramid fiber reinforcement; 3-8 parts of modified polyimide micro powder; 2 to 6 parts of a nano graphene composite material; 1 to 5 parts of modified polytetrafluoroethylene micro powder; 5 to 15 parts of organic silicon modified epoxy resin; 3 to 10 parts of a plasticizer; 1-3 parts of a stabilizer; 0.5 to 2 parts of an antioxidant; 0.5 to 2 parts of a lubricant; according to the high-wear-resistance composite elastomer for the spiral spring power line, innovative components such as the modified polyimide micro powder, the nano graphene composite material, the modified polytetrafluoroethylene micro powder and the organic silicon modified epoxy resin are introduced, so that the wear resistance and the elastic recovery capability of the material are remarkably improved, and the service life of the material is remarkably prolonged; the composite elastomer can be widely applied to manufacturing of power lines of electronic equipment and has a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of power cord materials, and in particular relates to a composite elastomer for a high-wear-resistant coil spring power cord. Background Art

[0002] With the widespread use of electronic devices, power cords, as crucial components connecting devices to power sources, are subject to increasingly stringent performance requirements. Traditional power cords are primarily made of rubber or ordinary plastic. While these materials offer a certain degree of flexibility and insulation, they lack sufficient wear resistance, elastic recovery, and service life. Especially in environments where frequent bending, stretching, and friction are present, traditional power cords are prone to wear and tear, impacting the normal operation and safety of devices.

[0003] Based on this, a composite elastomer for high wear-resistant coil spring power cord is designed. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a composite elastomer for a high-wear-resistant coil spring power cord and a preparation method thereof, which effectively solves the problems raised in the above background.

[0005] To achieve the above object, the present invention provides the following technical solution: a composite elastomer for a highly wear-resistant coil spring power cord, comprising the following components in parts by mass:

[0006] A composite elastomer for a high-wear-resistant coil spring power cord, characterized by comprising the following components in parts by mass:

[0007] Basic elastomer: 50-70 parts;

[0008] Nanocomposite filler: 5-15 parts;

[0009] Aramid fiber reinforcement: 10-20 parts;

[0010] Modified polyimide powder: 3-8 parts;

[0011] Nanographene composite material: 2 to 6 parts;

[0012] Modified polytetrafluoroethylene powder: 1-5 parts;

[0013] Silicone modified epoxy resin: 5-15 parts;

[0014] Plasticizer: 3-10 parts;

[0015] Stabilizer: 1-3 parts;

[0016] Antioxidant: 0.5-2 parts;

[0017] Lubricant: 0.5-2 parts.

[0018] Preferably, the base elastomer is a thermoplastic polyurethane elastomer;

[0019] The nanocomposite filler is one or more of nano-silicon dioxide, nano-calcium carbonate, and nano-aluminum oxide;

[0020] The plasticizer is dioctyl phthalate;

[0021] The stabilizer is calcium stearate;

[0022] The antioxidant was antioxidant 1010;

[0023] The lubricant is polyethylene wax.

[0024] Preferably, the pretreatment method of the aramid fiber reinforcement is as follows:

[0025] S1. Fiber surface etching:

[0026] Aramid fibers with a diameter of 10 to 15 μm are placed in 98% concentrated sulfuric acid and etched at 60 to 80°C for 30 to 60 minutes to remove the inert layer on the fiber surface and increase the specific surface area.

[0027] S2. Fiber surface grafting:

[0028] The etched aramid fiber is placed in an ethanol solution containing γ-aminopropyltriethoxysilane at a concentration of 2 to 5 wt%, and reacted at 50 to 70°C for 2 to 4 hours to graft amino groups on the fiber surface and enhance its interfacial bonding strength with the thermoplastic polyurethane elastomer.

[0029] Preferably, the preparation method of the modified polyimide micropowder is as follows:

[0030] S1. Synthesis of polyimide micropowder:

[0031] Dissolve pyromellitic dianhydride and diaminodiphenyl ether in N,N-dimethylacetamide at a molar ratio of 1:1, stir evenly, and the reaction temperature is 30-40°C and the reaction time is 2-4 hours;

[0032] The reaction product is poured into water for precipitation, filtered, washed with ethanol, and dried to obtain a polyimide prepolymer;

[0033] Grinding the polyimide prepolymer into fine powder with a particle size of 1 to 5 μm;

[0034] S2. Modification of polyimide micropowder:

[0035] Mix polyimide micropowder and silane coupling agent KH551 in a mass ratio of 1:0.1-0.3, place in a high-speed stirrer, stir at a speed of 1000-1500 r / min, and stir for 30-60 min;

[0036] The stirred mixture is placed in an oven at a temperature of 100 to 120° C. for a drying time of 2 to 4 hours to obtain modified polyimide micropowder.

[0037] Preferably, the preparation method of the nano-graphene composite material is as follows:

[0038] S1. Preparation of nanographene:

[0039] Mix natural graphite powder and concentrated sulfuric acid in a mass ratio of 1:10-15, place in an ice water bath, and slowly add potassium permanganate. The mass ratio of potassium permanganate to graphite powder is 3-5:1.

[0040] Heat the mixture to 35-45°C for 12-24 hours, then add deionized water to dilute and stir evenly;

[0041] The reaction product is treated with hydrogen peroxide at a concentration of 30% for 1 to 2 hours, and finally washed with deionized water until neutral, and dried to obtain nanographene;

[0042] S2. Preparation of nanographene composite materials:

[0043] The nanographene and epoxy resin are mixed in a mass ratio of 1:5-10, and placed in an ultrasonic disperser with an ultrasonic frequency of 40-60 kHz and an ultrasonic time of 30-60 minutes.

[0044] The mixture after ultrasonic dispersion is placed in a mold, heated to 120-140° C., and cured for 2-4 hours to obtain a nanographene composite material.

[0045] Preferably, the preparation method of the modified polytetrafluoroethylene powder is as follows:

[0046] S1. Synthesis of polytetrafluoroethylene powder:

[0047] The polytetrafluoroethylene resin particles are ground into fine powder with a particle size of 1 to 3 μm.

[0048] Mix polytetrafluoroethylene powder and nano-titanium dioxide in a mass ratio of 1:0.1-0.3, place in a ball mill, ball mill time is 4-8h, ball mill speed is 100-200r / min;

[0049] S2. Modification of polytetrafluoroethylene powder:

[0050] The ball-milled mixture is placed in a vacuum drying oven at a temperature of 60 to 80° C. for 2 to 4 hours to obtain modified polytetrafluoroethylene powder.

[0051] Preferably, the preparation method of the organosilicon-modified epoxy resin is as follows:

[0052] S1. Raw material preparation:

[0053] Weigh bisphenol A epoxy resin, organosilicon monomer and catalyst in a mass ratio of 100:20-50:0.5-2;

[0054] S2, reaction process:

[0055] Add bisphenol A epoxy resin into a reactor, stir and heat at 100-120°C until completely melted; then slowly add silicone monomer and catalyst, and react at 120-140°C for 2-4 hours; after the reaction is completed, cool to room temperature to obtain silicone-modified epoxy resin.

[0056] Preferably, the silicone monomer is hydroxyl-terminated polydimethylsiloxane;

[0057] The catalyst is dibutyltin dilaurate.

[0058] Preferably, the preparation method of the composite elastomer is as follows:

[0059] S1. Raw material mixing:

[0060] The base elastomer, nanocomposite filler, aramid fiber reinforcement, modified polyimide powder, nanographene composite material, modified polytetrafluoroethylene powder, silicone-modified epoxy resin, plasticizer, stabilizer, antioxidant and lubricant were weighed according to the above-mentioned parts by mass, and added into a high-speed mixer at a stirring speed of 800 to 1200 r / min for 10 to 20 min to obtain a mixture;

[0061] S2, plasticizing and molding:

[0062] The mixed material is added into a twin-screw extruder, the temperature of the extruder is controlled at 150-180° C., the screw speed is 200-300 r / min, and a composite elastomer material is obtained after extrusion molding;

[0063] S3, post-processing:

[0064] The extruded composite elastomer material is cooled to room temperature and then cut into power cord materials of desired sizes.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] The composite elastomer for high-wear-resistant coil spring power cords of the present invention significantly improves the wear resistance, elastic recovery ability and service life of the material by introducing innovative ingredients such as modified polyimide micropowder, nano-graphene composite material, modified polytetrafluoroethylene micropowder, and silicone-modified epoxy resin; its preparation method is simple and easy, with low cost, and is suitable for large-scale industrial production; the composite elastomer can be widely used in the manufacture of power cords for electronic equipment and has broad application prospects. DETAILED DESCRIPTION

[0067] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0068] The present invention provides a composite elastomer for a high-wear-resistant coil spring power cord, comprising the following components in parts by mass:

[0069] Basic elastomer: 50-70 parts;

[0070] Nanocomposite filler: 5-15 parts;

[0071] Aramid fiber reinforcement: 10-20 parts; significantly improves the tensile strength and fatigue resistance of the material;

[0072] Modified polyimide powder: 3-8 parts;

[0073] Polyimide itself has excellent wear resistance and mechanical strength. After a specific modification process, it has better compatibility with the base elastomer and can be evenly dispersed in the composite material. When the power cord is subjected to friction during use, the modified polyimide micropowder can form a protective layer on the material surface, effectively resisting external wear and reducing surface damage.

[0074] Nanographene composite material: 2 to 6 parts;

[0075] Nanographene has a unique two-dimensional layer structure with small interlayer spacing and strong van der Waals forces between layers. In composite materials, nanographene can be dispersed in the material matrix like a "shield". When subjected to external friction, the graphene sheets can disperse stress and prevent cracks from expanding, thereby significantly improving the wear resistance of the material.

[0076] Modified polytetrafluoroethylene powder: 1-5 parts;

[0077] Polytetrafluoroethylene has good flexibility and low friction coefficient. After modification, it is more tightly bonded to the base elastomer. When the power cord is subjected to external forces such as stretching or bending, the modified polytetrafluoroethylene powder can effectively disperse the stress and prevent excessive deformation of the internal structure of the material. When the external force disappears, it can also help the material quickly return to its original shape, improving the elastic recovery ability of the material.

[0078] Silicone modified epoxy resin: 5-15 parts;

[0079] Silicone has excellent flexibility and heat resistance, while epoxy resin has good adhesion and mechanical strength. The combination of the two, silicone-modified epoxy resin, can play the dual role of "binder" and "flexibilizer" in composite materials. It can enhance the adhesion between the various components within the material, while giving the material better flexibility, allowing the material to more smoothly return to its original shape after being deformed by external forces.

[0080] Plasticizer: 3-10 parts;

[0081] Stabilizer: 1-3 parts;

[0082] Antioxidant: 0.5-2 parts;

[0083] Lubricant: 0.5-2 parts.

[0084] The base elastomer of this embodiment is a thermoplastic polyurethane elastomer;

[0085] The nanocomposite filler is one or more of nano-silicon dioxide, nano-calcium carbonate, and nano-aluminum oxide;

[0086] The plasticizer is dioctyl phthalate;

[0087] The stabilizer is calcium stearate;

[0088] The antioxidant was antioxidant 1010;

[0089] The lubricant is polyethylene wax.

[0090] The pretreatment method of the aramid fiber reinforcement of this embodiment is as follows:

[0091] S1. Fiber surface etching:

[0092] Aramid fibers with a diameter of 10 to 15 μm are placed in 98% concentrated sulfuric acid and etched at 60 to 80°C for 30 to 60 minutes to remove the inert layer on the fiber surface and increase the specific surface area.

[0093] S2. Fiber surface grafting:

[0094] The etched aramid fiber is placed in an ethanol solution containing γ-aminopropyltriethoxysilane at a concentration of 2 to 5 wt%, and reacted at 50 to 70°C for 2 to 4 hours to graft amino groups on the fiber surface and enhance its interfacial bonding strength with the thermoplastic polyurethane elastomer.

[0095] The preparation method of the modified polyimide micropowder of this embodiment is as follows:

[0096] S1. Synthesis of polyimide micropowder:

[0097] Dissolve pyromellitic dianhydride and diaminodiphenyl ether in N,N-dimethylacetamide at a molar ratio of 1:1, stir evenly, and the reaction temperature is 30-40°C and the reaction time is 2-4 hours;

[0098] The reaction product is poured into water for precipitation, filtered, washed with ethanol, and dried to obtain a polyimide prepolymer;

[0099] Grinding the polyimide prepolymer into fine powder with a particle size of 1 to 5 μm;

[0100] S2. Modification of polyimide micropowder:

[0101] Mix polyimide micropowder and silane coupling agent KH551 in a mass ratio of 1:0.1-0.3, place in a high-speed stirrer, stir at a speed of 1000-1500 r / min, and stir for 30-60 min;

[0102] The stirred mixture is placed in an oven at a temperature of 100 to 120° C. for a drying time of 2 to 4 hours to obtain modified polyimide micropowder.

[0103] The preparation method of the nano-graphene composite material of this embodiment is as follows:

[0104] S1. Preparation of nanographene:

[0105] Mix natural graphite powder and concentrated sulfuric acid in a mass ratio of 1:10-15, place in an ice water bath, and slowly add potassium permanganate. The mass ratio of potassium permanganate to graphite powder is 3-5:1.

[0106] Heat the mixture to 35-45°C for 12-24 hours, then add deionized water to dilute and stir evenly;

[0107] The reaction product is treated with hydrogen peroxide at a concentration of 30% for 1 to 2 hours, and finally washed with deionized water until neutral, and dried to obtain nanographene;

[0108] S2. Preparation of nanographene composite materials:

[0109] The nanographene and epoxy resin are mixed in a mass ratio of 1:5-10, and placed in an ultrasonic disperser with an ultrasonic frequency of 40-60 kHz and an ultrasonic time of 30-60 minutes.

[0110] The mixture after ultrasonic dispersion is placed in a mold, heated to 120-140° C., and cured for 2-4 hours to obtain a nanographene composite material.

[0111] The preparation method of the modified polytetrafluoroethylene powder of this embodiment is as follows:

[0112] S1. Synthesis of polytetrafluoroethylene powder:

[0113] The polytetrafluoroethylene resin particles are ground into fine powder with a particle size of 1 to 3 μm.

[0114] Mix polytetrafluoroethylene powder and nano-titanium dioxide in a mass ratio of 1:0.1-0.3, place in a ball mill, ball mill time is 4-8h, ball mill speed is 100-200r / min;

[0115] S2. Modification of polytetrafluoroethylene powder:

[0116] The ball-milled mixture is placed in a vacuum drying oven at a temperature of 60 to 80° C. for 2 to 4 hours to obtain modified polytetrafluoroethylene powder.

[0117] The preparation method of the organosilicon-modified epoxy resin of this embodiment is as follows:

[0118] S1. Raw material preparation:

[0119] Weigh bisphenol A epoxy resin, organosilicon monomer and catalyst in a mass ratio of 100:20-50:0.5-2;

[0120] S2, reaction process:

[0121] Add bisphenol A epoxy resin into a reactor, stir and heat at 100-120°C until completely melted; then slowly add silicone monomer and catalyst, and react at 120-140°C for 2-4 hours; after the reaction is completed, cool to room temperature to obtain silicone-modified epoxy resin.

[0122] The silicone monomer of this embodiment is hydroxyl-terminated polydimethylsiloxane;

[0123] The catalyst is dibutyltin dilaurate.

[0124] The preparation method of the composite elastomer of this embodiment is as follows:

[0125] S1. Raw material mixing:

[0126] The base elastomer, nanocomposite filler, aramid fiber reinforcement, modified polyimide powder, nanographene composite material, modified polytetrafluoroethylene powder, silicone-modified epoxy resin, plasticizer, stabilizer, antioxidant and lubricant were weighed according to the above-mentioned parts by mass, and added into a high-speed mixer at a stirring speed of 800 to 1200 r / min for 10 to 20 min to obtain a mixture;

[0127] S2, plasticizing and molding:

[0128] The mixed material is added into a twin-screw extruder, the temperature of the extruder is controlled at 150-180° C., the screw speed is 200-300 r / min, and a composite elastomer material is obtained after extrusion molding;

[0129] S3, post-processing:

[0130] The extruded composite elastomer material is cooled to room temperature and then cut into power cord materials of desired sizes.

[0131] Example 1:

[0132] A composite elastomer for a highly wear-resistant coil spring power cord, comprising the following components in parts by mass:

[0133] Base elastomer: 50 parts;

[0134] Nanocomposite filler: 5 parts;

[0135] Aramid fiber reinforcement: 10 parts;

[0136] Modified polyimide powder: 3 parts;

[0137] Nanographene composite material: 2 parts;

[0138] Modified polytetrafluoroethylene powder: 1 part;

[0139] Silicone modified epoxy resin: 5 parts;

[0140] Plasticizer: 3 parts;

[0141] Stabilizer: 1 part;

[0142] Antioxidant: 0.5 parts;

[0143] Lubricant: 0.5 parts.

[0144] The base elastomer of this embodiment is a thermoplastic polyurethane elastomer;

[0145] The nanocomposite filler is one or more of nano-silicon dioxide, nano-calcium carbonate, and nano-aluminum oxide;

[0146] The plasticizer is dioctyl phthalate;

[0147] The stabilizer is calcium stearate;

[0148] The antioxidant was antioxidant 1010;

[0149] The lubricant is polyethylene wax.

[0150] The pretreatment method of the aramid fiber reinforcement of this embodiment is as follows:

[0151] S1. Fiber surface etching:

[0152] Aramid fibers with a diameter of 10 μm were placed in 98% concentrated sulfuric acid and etched at 60°C for 30 minutes to remove the inert layer on the fiber surface and increase the specific surface area.

[0153] S2. Fiber surface grafting:

[0154] The etched aramid fiber was placed in an ethanol solution containing γ-aminopropyltriethoxysilane at a concentration of 2wt% and reacted at 50°C for 2h to graft amino groups on the fiber surface and enhance its interfacial bonding strength with the thermoplastic polyurethane elastomer.

[0155] The preparation method of the modified polyimide micropowder of this embodiment is as follows:

[0156] S1. Synthesis of polyimide micropowder:

[0157] Dissolve pyromellitic dianhydride and diaminodiphenyl ether in N,N-dimethylacetamide at a molar ratio of 1:1, stir evenly, and the reaction temperature is 30°C and the reaction time is 2h;

[0158] The reaction product is poured into water for precipitation, filtered, washed with ethanol, and dried to obtain a polyimide prepolymer;

[0159] The polyimide prepolymer was ground into a fine powder with a particle size of 1 μm;

[0160] S2. Modification of polyimide micropowder:

[0161] Polyimide micropowder and silane coupling agent KH551 were mixed in a mass ratio of 1:0.1 and placed in a high-speed mixer at a stirring speed of 1000 r / min for 30 min.

[0162] The stirred mixture was placed in an oven at a temperature of 100° C. and a drying time of 2 h to obtain modified polyimide micropowder.

[0163] The preparation method of the nano-graphene composite material of this embodiment is as follows:

[0164] S1. Preparation of nanographene:

[0165] Mix natural graphite powder and concentrated sulfuric acid in a mass ratio of 1:10, place in an ice water bath, and slowly add potassium permanganate. The mass ratio of potassium permanganate to graphite powder is 3:1.

[0166] The mixture was heated to 35°C for 12 h, then diluted with deionized water and stirred evenly;

[0167] The reaction product was treated with hydrogen peroxide at a concentration of 30% for 1 hour, and finally washed with deionized water until neutral, and dried to obtain nanographene;

[0168] S2. Preparation of nanographene composite materials:

[0169] Nanographene and epoxy resin were mixed in a mass ratio of 1:5 and placed in an ultrasonic disperser with an ultrasonic frequency of 40 kHz and an ultrasonic time of 30 min.

[0170] The mixture after ultrasonic dispersion was placed in a mold, heated to 120° C., and cured for 2 h to obtain a nanographene composite material.

[0171] The preparation method of the modified polytetrafluoroethylene powder of this embodiment is as follows:

[0172] S1. Synthesis of polytetrafluoroethylene powder:

[0173] The polytetrafluoroethylene resin particles were ground into fine powder with a particle size of 1 μm.

[0174] Polytetrafluoroethylene powder and nano-titanium dioxide were mixed in a mass ratio of 1:0.1 and placed in a ball mill for 4 h at a speed of 100 r / min.

[0175] S2. Modification of polytetrafluoroethylene powder:

[0176] The ball-milled mixture was placed in a vacuum drying oven at 60° C. for 2 h to obtain modified polytetrafluoroethylene powder.

[0177] The preparation method of the organosilicon-modified epoxy resin of this embodiment is as follows:

[0178] S1. Raw material preparation:

[0179] Weigh bisphenol A epoxy resin, organosilicon monomer and catalyst in a mass ratio of 100:20:0.5;

[0180] S2, reaction process:

[0181] Add bisphenol A epoxy resin into a reactor and stir and heat at 100°C until completely melted; then slowly add silicone monomer and catalyst and react at 120°C for 2 hours; after the reaction is completed, cool to room temperature to obtain silicone-modified epoxy resin.

[0182] The silicone monomer of this embodiment is hydroxyl-terminated polydimethylsiloxane;

[0183] The catalyst is dibutyltin dilaurate.

[0184] The preparation method of the composite elastomer of this embodiment is as follows:

[0185] S1. Raw material mixing:

[0186] The base elastomer, nanocomposite filler, aramid fiber reinforcement, modified polyimide powder, nanographene composite material, modified polytetrafluoroethylene powder, silicone-modified epoxy resin, plasticizer, stabilizer, antioxidant and lubricant were weighed according to the above-mentioned parts by mass, and added into a high-speed mixer at a stirring speed of 800 r / min for 10 min to obtain a mixture;

[0187] S2, plasticizing and molding:

[0188] The mixed material is added into a twin-screw extruder, the temperature of the extruder is controlled at 150°C, the screw speed is 200 r / min, and a composite elastomer material is obtained after extrusion molding;

[0189] S3, post-processing:

[0190] The extruded composite elastomer material is cooled to room temperature and then cut into power cord materials of desired sizes.

[0191] Example 2:

[0192] A composite elastomer for a highly wear-resistant coil spring power cord, comprising the following components in parts by mass:

[0193] Base elastomer: 70 parts;

[0194] Nanocomposite filler: 15 parts;

[0195] Aramid fiber reinforcement: 20 parts;

[0196] Modified polyimide micropowder: 8 parts;

[0197] Nanographene composite material: 6 parts;

[0198] Modified polytetrafluoroethylene powder: 5 parts;

[0199] Silicone modified epoxy resin: 15 parts;

[0200] Plasticizer: 10 parts;

[0201] Stabilizer: 3 parts;

[0202] Antioxidant: 2 parts;

[0203] Lubricant: 2 parts.

[0204] The base elastomer of this embodiment is a thermoplastic polyurethane elastomer;

[0205] The nanocomposite filler is one or more of nano-silicon dioxide, nano-calcium carbonate, and nano-aluminum oxide;

[0206] The plasticizer is dioctyl phthalate;

[0207] The stabilizer is calcium stearate;

[0208] The antioxidant was antioxidant 1010;

[0209] The lubricant is polyethylene wax.

[0210] The pretreatment method of the aramid fiber reinforcement of this embodiment is as follows:

[0211] S1. Fiber surface etching:

[0212] Aramid fibers with a diameter of 15 μm were placed in 98% concentrated sulfuric acid and etched at 80°C for 60 minutes to remove the inert layer on the fiber surface and increase the specific surface area.

[0213] S2. Fiber surface grafting:

[0214] The etched aramid fiber was placed in an ethanol solution containing γ-aminopropyltriethoxysilane at a concentration of 5wt% and reacted at 70°C for 4 hours to graft amino groups on the fiber surface and enhance its interfacial bonding strength with the thermoplastic polyurethane elastomer.

[0215] The preparation method of the modified polyimide micropowder of this embodiment is as follows:

[0216] S1. Synthesis of polyimide micropowder:

[0217] Dissolve pyromellitic dianhydride and diaminodiphenyl ether in N,N-dimethylacetamide at a molar ratio of 1:1, stir evenly, and set the reaction temperature at 40°C for 4 hours.

[0218] The reaction product is poured into water for precipitation, filtered, washed with ethanol, and dried to obtain a polyimide prepolymer;

[0219] The polyimide prepolymer was ground into a fine powder with a particle size of 5 μm;

[0220] S2. Modification of polyimide micropowder:

[0221] Polyimide micropowder and silane coupling agent KH551 were mixed in a mass ratio of 1:0.3 and placed in a high-speed mixer at a stirring speed of 1500 r / min for 60 min.

[0222] The stirred mixture was placed in an oven at 120° C. for 4 hours to obtain modified polyimide powder.

[0223] The preparation method of the nano-graphene composite material of this embodiment is as follows:

[0224] S1. Preparation of nanographene:

[0225] Mix natural graphite powder and concentrated sulfuric acid in a mass ratio of 1:15, place in an ice water bath, and slowly add potassium permanganate. The mass ratio of potassium permanganate to graphite powder is 5:1.

[0226] The mixture was heated to 45°C for 24 h, then diluted with deionized water and stirred evenly;

[0227] The reaction product was treated with hydrogen peroxide at a concentration of 30% for 2 h, and finally washed with deionized water until neutral, and dried to obtain nanographene;

[0228] S2. Preparation of nanographene composite materials:

[0229] Nanographene and epoxy resin were mixed in a mass ratio of 1:10 and placed in an ultrasonic disperser with an ultrasonic frequency of 60 kHz and an ultrasonic time of 60 min.

[0230] The mixture after ultrasonic dispersion was placed in a mold, heated to 140° C., and cured for 4 h to obtain a nanographene composite material.

[0231] The preparation method of the modified polytetrafluoroethylene powder of this embodiment is as follows:

[0232] S1. Synthesis of polytetrafluoroethylene powder:

[0233] The polytetrafluoroethylene resin particles were ground into fine powder with a particle size of 3 μm.

[0234] Polytetrafluoroethylene powder and nano-titanium dioxide were mixed in a mass ratio of 1:0.3 and placed in a ball mill for 8 h at a speed of 200 r / min.

[0235] S2. Modification of polytetrafluoroethylene powder:

[0236] The ball-milled mixture was placed in a vacuum drying oven at 80° C. for 4 h to obtain modified polytetrafluoroethylene powder.

[0237] The preparation method of the organosilicon-modified epoxy resin of this embodiment is as follows:

[0238] S1. Raw material preparation:

[0239] Weigh bisphenol A epoxy resin, organosilicon monomer and catalyst in a mass ratio of 100:50:2;

[0240] S2, reaction process:

[0241] Add bisphenol A epoxy resin into the reactor and stir and heat at 120°C until it is completely melted; then slowly add silicone monomer and catalyst and react at 140°C for 4 hours; after the reaction is completed, cool to room temperature to obtain silicone-modified epoxy resin.

[0242] The silicone monomer of this embodiment is hydroxyl-terminated polydimethylsiloxane;

[0243] The catalyst is dibutyltin dilaurate.

[0244] The preparation method of the composite elastomer of this embodiment is as follows:

[0245] S1. Raw material mixing:

[0246] The base elastomer, nanocomposite filler, aramid fiber reinforcement, modified polyimide powder, nanographene composite material, modified polytetrafluoroethylene powder, silicone-modified epoxy resin, plasticizer, stabilizer, antioxidant and lubricant were weighed according to the above-mentioned mass parts, added into a high-speed mixer, stirred at a speed of 1200 r / min for 20 min to obtain a mixture;

[0247] S2, plasticizing and molding:

[0248] The mixed material is added into a twin-screw extruder, the temperature of the extruder is controlled at 180°C, the screw speed is 300r / min, and a composite elastomer material is obtained after extrusion molding;

[0249] S3, post-processing:

[0250] The extruded composite elastomer material is cooled to room temperature and then cut into power cord materials of desired sizes.

[0251] Example 3:

[0252] A composite elastomer for a highly wear-resistant coil spring power cord, comprising the following components in parts by mass:

[0253] Base elastomer: 60 parts;

[0254] Nanocomposite filler: 10 parts;

[0255] Aramid fiber reinforcement: 15 parts;

[0256] Modified polyimide powder: 5.5 parts;

[0257] Nanographene composite material: 4 parts;

[0258] Modified polytetrafluoroethylene powder: 3 parts;

[0259] Silicone modified epoxy resin: 10 parts;

[0260] Plasticizer: 6.5 parts;

[0261] Stabilizer: 2 parts;

[0262] Antioxidant: 1.3 parts;

[0263] Lubricant: 1.3 parts.

[0264] The base elastomer of this embodiment is a thermoplastic polyurethane elastomer;

[0265] The nanocomposite filler is one or more of nano-silicon dioxide, nano-calcium carbonate, and nano-aluminum oxide;

[0266] The plasticizer is dioctyl phthalate;

[0267] The stabilizer is calcium stearate;

[0268] The antioxidant was antioxidant 1010;

[0269] The lubricant is polyethylene wax.

[0270] The pretreatment method of the aramid fiber reinforcement of this embodiment is as follows:

[0271] S1. Fiber surface etching:

[0272] Aramid fibers with a diameter of 13 μm were placed in 98% concentrated sulfuric acid and etched at 70°C for 45 minutes to remove the inert layer on the fiber surface and increase the specific surface area.

[0273] S2. Fiber surface grafting:

[0274] The etched aramid fiber was placed in an ethanol solution containing γ-aminopropyltriethoxysilane at a concentration of 3.5wt% and reacted at 60°C for 3h to graft amino groups on the fiber surface and enhance its interfacial bonding strength with the thermoplastic polyurethane elastomer.

[0275] The preparation method of the modified polyimide micropowder of this embodiment is as follows:

[0276] S1. Synthesis of polyimide micropowder:

[0277] Dissolve pyromellitic dianhydride and diaminodiphenyl ether in N,N-dimethylacetamide at a molar ratio of 1:1, stir evenly, and set the reaction temperature at 35°C for 3 hours.

[0278] The reaction product is poured into water for precipitation, filtered, washed with ethanol, and dried to obtain a polyimide prepolymer;

[0279] The polyimide prepolymer was ground into a fine powder with a particle size of 3 μm;

[0280] S2. Modification of polyimide micropowder:

[0281] The polyimide powder and the silane coupling agent KH551 were mixed in a mass ratio of 1:0.2 and placed in a high-speed mixer at a stirring speed of 1250 r / min for 45 min.

[0282] The stirred mixture was placed in an oven at a temperature of 110° C. and a drying time of 3 h to obtain modified polyimide micropowder.

[0283] The preparation method of the nano-graphene composite material of this embodiment is as follows:

[0284] S1. Preparation of nanographene:

[0285] Mix natural graphite powder and concentrated sulfuric acid in a mass ratio of 1:13, place in an ice water bath, and slowly add potassium permanganate. The mass ratio of potassium permanganate to graphite powder is 4:1.

[0286] The mixture was heated to 40°C for 18 h, then diluted with deionized water and stirred evenly;

[0287] The reaction product was treated with hydrogen peroxide at a concentration of 30% for 1.5 h, and finally washed with deionized water until neutral, and dried to obtain nanographene;

[0288] S2. Preparation of nanographene composite materials:

[0289] Nanographene and epoxy resin were mixed in a mass ratio of 1:7.5 and placed in an ultrasonic disperser with an ultrasonic frequency of 50 kHz and an ultrasonic time of 45 min.

[0290] The mixture after ultrasonic dispersion was placed in a mold, heated to 130° C., and cured for 3 h to obtain a nanographene composite material.

[0291] The preparation method of the modified polytetrafluoroethylene powder of this embodiment is as follows:

[0292] S1. Synthesis of polytetrafluoroethylene powder:

[0293] The polytetrafluoroethylene resin particles were ground into fine powder with a particle size of 2 μm.

[0294] Polytetrafluoroethylene powder and nano-titanium dioxide were mixed in a mass ratio of 1:0.2 and placed in a ball mill for 6 h at a speed of 150 r / min.

[0295] S2. Modification of polytetrafluoroethylene powder:

[0296] The ball-milled mixture was placed in a vacuum drying oven at 70° C. for 3 h to obtain modified polytetrafluoroethylene powder.

[0297] The preparation method of the organosilicon-modified epoxy resin of this embodiment is as follows:

[0298] S1. Raw material preparation:

[0299] Weigh bisphenol A epoxy resin, organosilicon monomer and catalyst in a mass ratio of 100:35:1.3;

[0300] S2, reaction process:

[0301] Add bisphenol A epoxy resin into the reactor and stir and heat at 110°C until it is completely melted; then slowly add silicone monomer and catalyst and react at 130°C for 3 hours; after the reaction is completed, cool to room temperature to obtain silicone-modified epoxy resin.

[0302] The silicone monomer of this embodiment is hydroxyl-terminated polydimethylsiloxane;

[0303] The catalyst is dibutyltin dilaurate.

[0304] The preparation method of the composite elastomer of this embodiment is as follows:

[0305] S1. Raw material mixing:

[0306] The base elastomer, nanocomposite filler, aramid fiber reinforcement, modified polyimide powder, nanographene composite material, modified polytetrafluoroethylene powder, silicone-modified epoxy resin, plasticizer, stabilizer, antioxidant and lubricant were weighed according to the above-mentioned parts by mass, and added into a high-speed mixer at a stirring speed of 1000 r / min for 15 min to obtain a mixture;

[0307] S2, plasticizing and molding:

[0308] The mixed material is added into a twin-screw extruder, the temperature of the extruder is controlled at 165° C., the screw speed is 250 r / min, and a composite elastomer material is obtained after extrusion molding;

[0309] S3, post-processing:

[0310] The extruded composite elastomer material is cooled to room temperature and then cut into power cord materials of desired sizes.

[0311] Example 4:

[0312] A composite elastomer for a highly wear-resistant coil spring power cord, comprising the following components in parts by mass:

[0313] Base elastomer: 55 parts;

[0314] Nanocomposite filler: 7 parts;

[0315] Aramid fiber reinforcement: 12 parts;

[0316] Modified polyimide powder: 4 parts;

[0317] Nanographene composite material: 3 parts;

[0318] Modified polytetrafluoroethylene powder: 2 parts;

[0319] Silicone modified epoxy resin: 6 parts;

[0320] Plasticizer: 4 parts;

[0321] Stabilizer: 1 part;

[0322] Antioxidant: 1 part;

[0323] Lubricant: 1 part.

[0324] The base elastomer of this embodiment is a thermoplastic polyurethane elastomer;

[0325] The nanocomposite filler is one or more of nano-silicon dioxide, nano-calcium carbonate, and nano-aluminum oxide;

[0326] The plasticizer is dioctyl phthalate;

[0327] The stabilizer is calcium stearate;

[0328] The antioxidant was antioxidant 1010;

[0329] The lubricant is polyethylene wax.

[0330] The pretreatment method of the aramid fiber reinforcement of this embodiment is as follows:

[0331] S1. Fiber surface etching:

[0332] Aramid fibers with a diameter of 11 μm were placed in 98% concentrated sulfuric acid and etched at 65°C for 35 minutes to remove the inert layer on the fiber surface and increase the specific surface area.

[0333] S2. Fiber surface grafting:

[0334] The etched aramid fiber was placed in an ethanol solution containing γ-aminopropyltriethoxysilane at a concentration of 3wt% and reacted at 55°C for 2.5h to graft amino groups on the fiber surface and enhance its interfacial bonding strength with the thermoplastic polyurethane elastomer.

[0335] The preparation method of the modified polyimide micropowder of this embodiment is as follows:

[0336] S1. Synthesis of polyimide micropowder:

[0337] Dissolve pyromellitic dianhydride and diaminodiphenyl ether in N,N-dimethylacetamide at a molar ratio of 1:1, stir evenly, and set the reaction temperature at 32°C for 2.5 h.

[0338] The reaction product is poured into water for precipitation, filtered, washed with ethanol, and dried to obtain a polyimide prepolymer;

[0339] The polyimide prepolymer was ground into a fine powder with a particle size of 2 μm;

[0340] S2. Modification of polyimide micropowder:

[0341] Polyimide micropowder and silane coupling agent KH551 were mixed in a mass ratio of 1:0.1 and placed in a high-speed mixer at a stirring speed of 1100 r / min for 35 min.

[0342] The stirred mixture was placed in an oven at a temperature of 105° C. and a drying time of 2.5 h to obtain modified polyimide micropowder.

[0343] The preparation method of the nano-graphene composite material of this embodiment is as follows:

[0344] S1. Preparation of nanographene:

[0345] Mix natural graphite powder and concentrated sulfuric acid in a mass ratio of 1:11, place in an ice water bath, and slowly add potassium permanganate. The mass ratio of potassium permanganate to graphite powder is 3:1.

[0346] The mixture was heated to 37°C for 15 h, then diluted with deionized water and stirred evenly;

[0347] The reaction product was treated with hydrogen peroxide at a concentration of 30% for 1.2 h, and finally washed with deionized water until neutral, and dried to obtain nanographene;

[0348] S2. Preparation of nanographene composite materials:

[0349] Nanographene and epoxy resin were mixed in a mass ratio of 1:6 and placed in an ultrasonic disperser with an ultrasonic frequency of 45 kHz and an ultrasonic time of 35 min.

[0350] The mixture after ultrasonic dispersion was placed in a mold, heated to 125° C., and cured for 2.5 h to obtain a nanographene composite material.

[0351] The preparation method of the modified polytetrafluoroethylene powder of this embodiment is as follows:

[0352] S1. Synthesis of polytetrafluoroethylene powder:

[0353] The polytetrafluoroethylene resin particles were ground into fine powder with a particle size of 1 μm.

[0354] Polytetrafluoroethylene powder and nano-titanium dioxide were mixed in a mass ratio of 1:0.1 and placed in a ball mill for 5 h at a speed of 120 r / min.

[0355] S2. Modification of polytetrafluoroethylene powder:

[0356] The ball-milled mixture was placed in a vacuum drying oven at 65° C. for 2.5 h to obtain modified polytetrafluoroethylene powder.

[0357] The preparation method of the organosilicon-modified epoxy resin of this embodiment is as follows:

[0358] S1. Raw material preparation:

[0359] Weigh bisphenol A epoxy resin, organosilicon monomer and catalyst in a mass ratio of 100:25:1;

[0360] S2, reaction process:

[0361] Add bisphenol A epoxy resin into the reactor and stir and heat at 105°C until it is completely melted; then slowly add silicone monomer and catalyst and react at 125°C for 2.5 hours; after the reaction is completed, cool to room temperature to obtain silicone-modified epoxy resin.

[0362] The silicone monomer of this embodiment is hydroxyl-terminated polydimethylsiloxane;

[0363] The catalyst is dibutyltin dilaurate.

[0364] The preparation method of the composite elastomer of this embodiment is as follows:

[0365] S1. Raw material mixing:

[0366] The base elastomer, nanocomposite filler, aramid fiber reinforcement, modified polyimide powder, nanographene composite material, modified polytetrafluoroethylene powder, silicone-modified epoxy resin, plasticizer, stabilizer, antioxidant and lubricant were weighed according to the above-mentioned parts by mass, and added into a high-speed mixer at a stirring speed of 900 r / min for 12 min to obtain a mixture;

[0367] S2, plasticizing and molding:

[0368] The mixed material is added into a twin-screw extruder, the temperature of the extruder is controlled at 160°C, the screw speed is 220r / min, and a composite elastomer material is obtained after extrusion molding;

[0369] S3, post-processing:

[0370] The extruded composite elastomer material is cooled to room temperature and then cut into power cord materials of desired sizes.

[0371] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0372] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A composite elastic body for a high wear-resistant coil spring power cord, characterized in that: It includes the following components by mass: Basic elastomer: 50-70 parts; Nanocomposite filler: 5-15 parts; Aramid fiber reinforcement: 10-20 parts; Modified polyimide powder: 3-8 parts; Nanographene composite material: 2 to 6 parts; Modified polytetrafluoroethylene powder: 1-5 parts; Silicone modified epoxy resin: 5-15 parts; Plasticizer: 3-10 parts; Stabilizer: 1-3 parts; Antioxidant: 0.5-2 parts; Lubricant: 0.5-2 parts.

2. The composite elastic body for a high wear-resistant coil spring power cord according to claim 1, characterized in that: The base elastomer is a thermoplastic polyurethane elastomer; The nanocomposite filler is one or more of nano-silicon dioxide, nano-calcium carbonate, and nano-aluminum oxide; The plasticizer is dioctyl phthalate; The stabilizer is calcium stearate; The antioxidant was antioxidant 1010; The lubricant is polyethylene wax.

3. The composite elastic body for a high wear-resistant coil spring power cord according to claim 1, characterized in that: The pretreatment method of the aramid fiber reinforcement is as follows: S1. Fiber surface etching: Aramid fibers with a diameter of 10 to 15 μm are placed in 98% concentrated sulfuric acid and etched at 60 to 80°C for 30 to 60 minutes to remove the inert layer on the fiber surface and increase the specific surface area. S2. Fiber surface grafting: The etched aramid fiber is placed in an ethanol solution containing γ-aminopropyltriethoxysilane at a concentration of 2 to 5 wt%, and reacted at 50 to 70°C for 2 to 4 hours to graft amino groups on the fiber surface and enhance its interfacial bonding strength with the thermoplastic polyurethane elastomer.

4. The composite elastic body for a high wear-resistant coil spring power cord according to claim 1, characterized in that: The preparation method of the modified polyimide micropowder is as follows: S1. Synthesis of polyimide micropowder: Dissolve pyromellitic dianhydride and diaminodiphenyl ether in N,N-dimethylacetamide at a molar ratio of 1:1, stir evenly, and the reaction temperature is 30-40°C and the reaction time is 2-4 hours; The reaction product is poured into water for precipitation, filtered, washed with ethanol, and dried to obtain a polyimide prepolymer; Grinding the polyimide prepolymer into fine powder with a particle size of 1 to 5 μm; S2. Modification of polyimide micropowder: Mix polyimide micropowder and silane coupling agent KH551 in a mass ratio of 1:0.1-0.3, place in a high-speed stirrer, stir at a speed of 1000-1500 r / min, and stir for 30-60 min; The stirred mixture is placed in an oven at a temperature of 100 to 120° C. for a drying time of 2 to 4 hours to obtain modified polyimide micropowder.

5. The composite elastic body for a high wear-resistant coil spring power cord according to claim 1, characterized in that: The preparation method of the nano-graphene composite material is as follows: S1. Preparation of nanographene: Mix natural graphite powder and concentrated sulfuric acid in a mass ratio of 1:10-15, place in an ice water bath, and slowly add potassium permanganate. The mass ratio of potassium permanganate to graphite powder is 3-5:

1. Heat the mixture to 35-45°C for 12-24 hours, then add deionized water to dilute and stir evenly; The reaction product is treated with hydrogen peroxide at a concentration of 30% for 1 to 2 hours, and finally washed with deionized water until neutral, and dried to obtain nanographene; S2. Preparation of nanographene composite materials: The nanographene and epoxy resin are mixed in a mass ratio of 1:5-10, and placed in an ultrasonic disperser with an ultrasonic frequency of 40-60 kHz and an ultrasonic time of 30-60 minutes. The mixture after ultrasonic dispersion is placed in a mold, heated to 120-140° C., and cured for 2-4 hours to obtain a nanographene composite material.

6. The composite elastic body for a high wear-resistant coil spring power cord according to claim 1, characterized in that: The preparation method of the modified polytetrafluoroethylene micropowder is as follows: S1. Synthesis of polytetrafluoroethylene powder: The polytetrafluoroethylene resin particles are ground into fine powder with a particle size of 1 to 3 μm. Mix polytetrafluoroethylene powder and nano-titanium dioxide in a mass ratio of 1:0.1-0.3, place in a ball mill, ball mill time is 4-8h, ball mill speed is 100-200r / min; S2. Modification of polytetrafluoroethylene powder: The ball-milled mixture is placed in a vacuum drying oven at a temperature of 60 to 80° C. for 2 to 4 hours to obtain modified polytetrafluoroethylene powder.

7. The composite elastic body for a high wear-resistant coil spring power cord according to claim 1, characterized in that: The preparation method of the organosilicon-modified epoxy resin is as follows: S1. Raw material preparation: Weigh bisphenol A epoxy resin, organosilicon monomer and catalyst in a mass ratio of 100:20-50:0.5-2; S2, reaction process: Add bisphenol A epoxy resin into a reactor, stir and heat at 100-120°C until completely melted; then slowly add silicone monomer and catalyst, and react at 120-140°C for 2-4 hours; after the reaction is completed, cool to room temperature to obtain silicone-modified epoxy resin.

8. The composite elastic body for a high wear-resistant coil spring power cord according to claim 7, characterized in that: The silicone monomer is hydroxyl-terminated polydimethylsiloxane; The catalyst is dibutyltin dilaurate.

9. A highly wear-resistant composite elastic body for a coil spring power cord according to any one of claims 1 to 8, characterized in that: The preparation method of the composite elastomer is as follows: S1. Raw material mixing: The base elastomer, nanocomposite filler, aramid fiber reinforcement, modified polyimide powder, nanographene composite material, modified polytetrafluoroethylene powder, silicone-modified epoxy resin, plasticizer, stabilizer, antioxidant and lubricant were weighed according to the above-mentioned parts by mass, and added into a high-speed mixer at a stirring speed of 800 to 1200 r / min for 10 to 20 min to obtain a mixture; S2, plasticizing and molding: The mixed material is added into a twin-screw extruder, the temperature of the extruder is controlled at 150-180° C., the screw speed is 200-300 r / min, and a composite elastomer material is obtained after extrusion molding; S3, post-processing: The extruded composite elastomer material is cooled to room temperature and then cut into power cord materials of desired sizes.