Wear-resistant pbt / pet high-elasticity core-spun yarn and fabric production method thereof

Abstract

The present application relates to the technical field of textile materials, in particular to a wear-resistant PBT / PET high-elasticity core-spun yarn and a production method of a fabric thereof.The PBT, PET, flame-retardant toughening agent and antistatic agent are mechanically mixed, melt-blended, extruded and granulated, and melt-spun to obtain PBT / PET filaments; two short fiber rovings are used as the cladding layer, and the twisted PBT / PET filaments are used as the core layer, and the PBT / PET high-elasticity core-spun yarn is formed through the siro-spinning core-spun process.The core-spun yarn prepared by the present application has excellent flame retardancy, antistatic property and toughness, and therefore has a wide application prospect in the technical field of textile materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile materials, in particular to a wear-resistant PBT / PET high-elasticity core-spun yarn and a production method thereof. BACKGROUND

[0002] In the modern textile field, PBT / PET core-spun yarns have shown important values in multiple dimensions due to their unique properties and advantages. From the perspective of performance advantages, PBT / PET core-spun yarns combine the characteristics of PBT (polybutylene terephthalate) and PET (polyethylene terephthalate). PBT has good elasticity and recovery, allowing the yarn to quickly return to its original shape after stretching and not easily deforming; PET gives the yarn high strength and good dimensional stability. This combination makes core-spun yarns perform well in clothing, home textiles, and other products. In sportswear, its elasticity meets the stretching needs of the human body during movement, while high strength ensures the durability of the clothing, extending the product's service life. In the home textile field, its dimensional stability makes the fabric less prone to shrinkage and deformation, maintaining a good appearance.

[0003] However, during textile processing, yarns need to withstand various external forces such as stretching and friction. If the toughness is insufficient, the yarns are prone to breakage, which not only reduces production efficiency and increases production costs, but also affects product quality, so the toughness of the yarns needs to be improved to ensure normal use of the products. In addition, flame retardancy is a key factor in ensuring safety. In some special occasions, such as decorative fabrics in public places, interior decoration of vehicles, etc., once a fire occurs, products made of ordinary yarns are prone to burn and spread quickly, causing serious casualties and property losses. By improving the flame retardancy of PBT / PET core-spun yarns, the spread of fire can be effectively delayed, giving valuable time for personnel evacuation and fire rescue. Furthermore, in dry environments, yarns are prone to static electricity, which can attract dust and make the product surface dirty, affecting the appearance. At the same time, static electricity can also cause electric shock, bringing discomfort to users. In some occasions sensitive to static electricity, such as electronic workshops, gas stations, etc., static electricity can even cause serious accidents such as fire or explosion. Therefore, the antistatic property of the yarns needs to be improved to avoid these problems, improve the safety and comfort of product use, and broaden its application range.

[0004] In order to overcome the defects of the prior art, the present application provides a wear-resistant PBT / PET high-elasticity core-spun yarn and a production method thereof. SUMMARY

[0005] The purpose of the present application is to provide a wear-resistant PBT / PET high-elasticity core-spun yarn and a production method thereof to solve the problems in the prior art.

[0006] To achieve the above object, the present application provides the following technical solutions:

[0007] A preparation method of wear-resistant PBT / PET high-elasticity core-spun yarn, comprising the following steps: mechanically mixing dried PBT, PET, flame-retardant toughening agent and antistatic agent, melt blending, extruding and granulating, melt spinning to obtain PBT / PET filaments; using the two short fiber rovings as the cladding layer and the twisted PBT / PET filaments as the core layer, forming the PBT / PET high-elasticity core-spun yarn through the siro-spinning core-spun process.

[0008] More preferably, the melt blending parameters are: temperature 260-280 DEG C, screw rotation speed 160-180 r / min; the melt spinning parameters are: temperature 280-300 DEG C, spinning speed 900-1200 m / min.

[0009] More preferably, the PBT / PET filaments are twisted with S twist, the twist 4-5 twists / cm, to obtain the twisted PBT / PET filaments; when the siro-spinning core-spun process is used, the PBT / PET high-elasticity core-spun yarn with PBT / PET filament content of 35-40% is obtained by adjusting the feeding speed and ratio of the short fiber rovings and the PBT / PET filaments.

[0010] More preferably, the preparation process of the flame-retardant toughening agent is as follows:

[0011] Step S1: gradually warming the phenyl tris(dimethylsiloxanyl)silane liquid to 105-110 DEG C and keeping for 30 min under nitrogen environment, then cooling to 80-90 DEG C, adding Karstedt platinum gold catalyst, then adding allyl glycidyl ether dropwise, warming to 105-110 DEG C and keeping for 2 h after the dropwise addition is completed, obtaining the epoxidized silicone resin after the reaction is completed;

[0012] Step S2: adding eugenol and anhydrous potassium carbonate into tetrahydrofuran, stirring uniformly to obtain eugenol solution; adding hexachlorocyclotriphosphazene into tetrahydrofuran, stirring uniformly to obtain hexachlorocyclotriphosphazene solution; adding the hexachlorocyclotriphosphazene solution into the eugenol solution, stirring for 60-80 min, warming to 60-65 DEG C, continuing to reflux for 25-30 h, concentrating, recrystallizing, suction filtering, washing and drying after the reaction is completed, to obtain the vinyl-terminated cyclotriphosphazene;

[0013] Step S3: under the environment of nitrogen, the epoxy silicone resin, Karstedt platinum gold catalyst and vinyl-terminated cyclotriphosphazene are mixed, stirred uniformly, gradually heated to 105-110°C and kept for 2.0-2.5h; then cooled to 80-90°C, added with Karstedt platinum gold catalyst and kept for 20-30min; then gradually heated to 105-110°C and kept for 2.0-2.5h, after the reaction is completed, cooled, distilled under reduced pressure to obtain the flame-retardant toughening agent.

[0014] More preferably, the reaction molar ratio of phenyl tris(dimethylsiloxanyl)silane and allyl glycidyl ether is 1:(2.0-2.1); the reaction molar ratio of eugenol and hexachlorocyclotriphosphazene is (6.2-6.4):1; the reaction mass-volume ratio of epoxy silicone resin, vinyl-terminated cyclotriphosphazene, Karstedt platinum gold catalyst is 40g:(9-10)g:0.02mL.

[0015] More preferably, the antistatic agent includes polyaniline-coated carbon nanotubes and polyetheramine-coated carbon nanotubes, and the mixing ratio is 2:1, and the specific preparation process is as follows:

[0016] Step S1: add carbon nanotubes to acid solution, ultrasonically disperse uniformly, stir at 60-70°C for 3-5h, after the reaction is completed, wash with water, suction filter, and dry to obtain modified carbon nanotubes;

[0017] Step S2: mix the modified carbon nanotubes, 1,3-propanediamine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and sodium dihydrogen phosphate buffer solution, ultrasonically react at 35-40°C for 5.5-6.5h in a closed environment, after the reaction is completed, suction filter with water, and dry to obtain aminated carbon nanotubes; add the aminated carbon nanotubes to deionized water, ultrasonically disperse for 60-80min, add hydrochloric acid to adjust the pH to 1.3-1.5, then add aniline and cool to 0-3°C, magnetically stir for 1.0-1.5h, then slowly add 2.6-2.8g / mL ammonium persulfate solution, continue to react for 6-7h after the addition is completed, after the reaction is completed, suction filter, and dry to obtain polyaniline-coated carbon nanotubes;

[0018] Step S3: mix the modified carbon nanotubes, polyetheramine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and sodium dihydrogen phosphate buffer solution, ultrasonically react at 35-40°C for 7-8h in a closed environment, after the reaction is completed, suction filter with water, and dry to obtain polyetheramine-coated carbon nanotubes.

[0019] More preferably, the acid solution comprises 97-98wt% sulfuric acid and 65-68wt% nitric acid; when preparing the modified carbon nanotube, the mass-volume ratio of the carbon nanotube, sulfuric acid and nitric acid is 0.01g:3mL:(1.5-1.7)mL; when preparing the aminated carbon nanotube, the mass-volume ratio of the modified carbon nanotube, 1,3-propanediamine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and sodium dihydrogen phosphate buffer solution is 1mg:(8-10)mg:5mg:0.5mL; when preparing the polyaniline-coated carbon nanotube, the mass-volume ratio of the aminated carbon nanotube, aniline and ammonium persulfate solution is (1.5-2.0)g:1.3g:15mL; when preparing the polyetheramine-coated carbon nanotube, the mass-volume ratio of the modified carbon nanotube, polyetheramine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and sodium dihydrogen phosphate buffer solution is 1mg:(10-12)mg:5mg:0.5mL.

[0020] More preferably, the PBT / PET filament contains the following components in mass fraction: 50-70 parts of PBT, 40-50 parts of PET, 10-15 parts of flame-retardant toughening agent, 3-5 parts of polyaniline-coated carbon nanotube and 1.5-2.5 parts of polyetheramine-coated carbon nanotube.

[0021] A fabric prepared from the wear-resistant PBT / PET high-elastic core-spun yarn, the wear-resistant PBT / PET high-elastic core-spun yarn is used as weft yarn and is woven together with warp yarn to prepare the fabric.

[0022] The present application has the following advantages:

[0023] The present application has the following advantages:

[0024] The molecular structure of the flame-retardant toughening agent contains both cyclotriphosphazene and siloxane flame-retardant structures. When exposed to high temperature or a fire source, the phosphorus element in the cyclotriphosphazene promotes the dehydration and carbonization of the polymer matrix, forming a stable and dense carbonized layer on the surface of the material. This carbonized layer acts as a strong barrier, effectively blocking the transmission of oxygen and heat to the interior of the material, reducing the generation of flammable gases, and inhibiting combustion from the condensed phase. At the same time, siloxane generates silicon dioxide during combustion, which cooperates with the carbonized layer to further enhance the heat and oxygen blocking effect. In addition, the siloxane free radicals formed by the volatilization of siloxane can also participate in gas-phase flame retardation. This synergistic effect of gas-phase and condensed-phase flame retardation enables the flame-retardant toughening agent to have excellent flame-retardant ability. In terms of toughness, the siloxane molecular chain in the flame-retardant toughening agent has high flexibility and rotatability. When the material is subjected to external force impact, the siloxane chain segment can deform, absorb and disperse energy, effectively preventing crack propagation. In addition, the epoxy group in the flame-retardant toughening agent has high reactivity under high temperature conditions, which can react with the ester group on the PBT and PET molecular chain to form new chemical bonds. This chemical reaction establishes a chemical connection between the flame-retardant toughening agent and the PBT and PET molecules, rather than just simple physical mixing. Due to the reaction of the epoxy group with PBT and PET to form chemical bonds, the interfacial bonding force between the flame-retardant toughening agent and the matrix is enhanced. When the material is under stress, this strong interfacial bonding can more effectively transfer stress, enabling the flame-retardant toughening agent to better play its flame-retardant and toughening role, improving the overall mechanical properties and flame-retardant properties of the material.

[0025] The application is characterized in that the carbon nanotubes are surface modified by adding acid liquid to obtain active carbon nanotubes containing carboxyl and other oxygen-containing groups on the surface. Then, amidation reaction occurs by adding modified carbon nanotubes, 1,3-propanediamine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution, to obtain aminated carbon nanotubes. The 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride acts as a carboxyl activator to convert the carboxyl group into a more reactive intermediate. The amino group of the 1,3-propanediamine molecule attacks the activated carboxyl group by nucleophilic attack, nucleophilic substitution reaction occurs, and an amide bond is formed, thereby connecting the 1,3-propanediamine to the surface of the carbon nanotubes and realizing the amination of the carbon nanotubes. Further, the nitrogen atom in the amino group on the surface of the aminated carbon nanotubes has a lone pair of electrons, and the hydrogen atom of the amino group in the aniline molecule has a certain acidity, and the two can form a hydrogen bond (N-H…N). This hydrogen bond interaction can allow the aniline molecules to be arranged in an orderly manner and adsorbed on the surface of the aminated carbon nanotubes, increasing the local concentration of aniline on the surface of the carbon nanotubes. Then, under the action of the acid condition and the initiator, the polymerization reaction continuously occurs, and the polyaniline long chains preferentially grow and accumulate on the surface of the carbon nanotubes, eventually completely covering the aminated carbon nanotubes to form a polyaniline-coated carbon nanotube composite material. By adding modified carbon nanotubes, polyetheramine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution, amidation reaction occurs, thereby allowing the polyetheramine to be coated on the surface of the carbon nanotubes to obtain polyetheramine-coated carbon nanotubes. Then, the polyaniline-coated carbon nanotubes and the polyetheramine-coated carbon nanotubes are mixed to obtain an antistatic agent.

[0026] In terms of antistatic performance, polyaniline itself is a conductive polymer material with good conductivity. When it is coated on the surface of the carbon nanotubes, a continuous conductive channel is formed. Electrons can move and conduct quickly on the polyaniline segments and the surface of the carbon nanotubes, effectively reducing the surface resistance of the material and thus rapidly conducting away the generated static electricity. The polyetheramine-coated carbon nanotubes also play a synergistic role. The polyetheramine has a certain hydrophilicity and can adsorb moisture in the air to form a thin water film on the surface of the material. The water film can promote the movement of ions, further improving the conductivity and antistatic ability of the material. Moreover, after the two types of coated carbon nanotubes are mixed, they interweave in space to form a more complex and effective conductive network, enhancing the overall antistatic performance. Therefore, in summary, the core-spun yarn prepared by the application has excellent flame retardancy, antistatic property, and toughness, and thus has a wide application prospect in the field of textile material technology. DETAILED DESCRIPTION

[0027] Raw material sources:

[0028] Karstedt platinum gold catalyst, provided by Hubei Xiyu Hong Biological Medicine Technology Co., Ltd., model 123; carbon nanotubes, provided by Ningbo Luofei Nanometer Technology Co., Ltd., particle size 5 μm; polyether amine, provided by Fujian Diseng Technology Co., Ltd., molecular weight 425.5; sodium dihydrogen phosphate buffer solution, pH 4.7; PBT, provided by Suzhou Huxing Plasticizing Co., Ltd., viscosity 85 cm / g; PET, provided by Plastic Hair Engineering Plastic (Tianjin) Co., Ltd., model FR530; short fiber roving, provided by Shandong Henghua Textile Co., Ltd., specifically cotton yarn, fiber fineness 1.5D; in mass fraction, one part is 1 g. 3

[0029] Example 1: Step S1: Under the nitrogen environment, gradually heat the phenyl tris (dimethyl siloxane) silane liquid to 110℃ and keep for 40 min, then cool to 90℃, then add Karstedt platinum gold catalyst, then add allyl glycidyl ether dropwise, after the dropwise addition is completed, heat to 110℃ and keep for 2.5 h, and after the reaction is completed, the epoxidized silicone resin is obtained; the reaction molar ratio of phenyl tris (dimethyl siloxane) silane and allyl glycidyl ether is 1:2.05;

[0030] Step S2: Add eugenol and anhydrous potassium carbonate to tetrahydrofuran, stir uniformly to obtain an eugenol solution; add hexachlorocyclotriphosphazene to tetrahydrofuran, stir uniformly to obtain a hexachlorocyclotriphosphazene solution; add the hexachlorocyclotriphosphazene solution to the eugenol solution dropwise, stir for 80 min, then heat to 65℃, continue to reflux for 30 h, after the reaction is completed, concentrate, recrystallize, filter, wash and dry to obtain a vinyl-terminated cyclotriphosphazene; the reaction molar ratio of eugenol and hexachlorocyclotriphosphazene is 6.3:1;

[0031] Step S3: Under the nitrogen environment, mix the epoxidized silicone resin, Karstedt platinum gold catalyst and vinyl-terminated cyclotriphosphazene, stir uniformly, then gradually heat to 110℃ and keep for 2.5 h; then cool to 90℃, then add Karstedt platinum gold catalyst and keep for 30 min; then gradually heat to 110℃ and keep for 2.5 h, after the reaction is completed, cool, and distill under reduced pressure to obtain a flame-retardant toughening agent; the reaction mass-volume ratio of epoxidized silicone resin, vinyl-terminated cyclotriphosphazene and Karstedt platinum gold catalyst is 40 g:9.5 g:0.02 mL;

[0032] Step S4: Add carbon nanotubes to an acid solution, ultrasonically disperse uniformly, then stir at 70℃ for 5 h, after the reaction is completed, wash with water, filter, and dry to obtain modified carbon nanotubes; the acid solution includes 98wt% sulfuric acid and 68wt% nitric acid; when preparing the modified carbon nanotubes, the mass-volume ratio of carbon nanotubes, sulfuric acid and nitric acid is 0.01 g:3 mL:1.6 mL;​

[0033] Step S5: mixing the modified carbon nanotube, 1, 3-propanediamine, 1-ethyl-(3- dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution, ultrasonic reaction for 6.5h at 40℃ in a closed environment, after the reaction, water filtration, drying, to obtain the aminated carbon nanotube; adding the aminated carbon nanotube to deionized water, ultrasonic dispersion for 80min, then adding hydrochloric acid to adjust the pH to 1.5, then adding aniline and cooling to 3℃, magnetic stirring for 1.5h, then slowly adding 2.8g / mL ammonium persulfate solution, continuing to react for 7h after the end of the drop, after the reaction, filtration, drying, to obtain the polyaniline coated carbon nanotube; when preparing the aminated carbon nanotube, the mass volume ratio of the modified carbon nanotube, 1, 3-propanediamine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution is 1mg: 9mg: 5mg: 0.5mL; when preparing the polyaniline coated carbon nanotube, the mass volume ratio of the aminated carbon nanotube, aniline, ammonium persulfate solution is 1.7g: 1.3g: 15mL;

[0034] Step S6: mixing the modified carbon nanotube, polyetheramine, 1-ethyl-(3- dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution, ultrasonic reaction for 8h at 40℃ in a closed environment, after the reaction, water filtration, drying, to obtain the polyetheramine coated carbon nanotube; when preparing the polyetheramine coated carbon nanotube, the mass volume ratio of the modified carbon nanotube, polyetheramine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution is 1mg: 11mg: 5mg: 0.5mL;

[0035] Step S7: mechanically mixing 60g of dried PBT, 45g of PET, 12g of flame-retardant toughening agent, 5g of polyaniline coated carbon nanotube, and 2.5g of polyetheramine coated carbon nanotube, melt blending, extruding, granulating, and melt spinning to obtain PBT / PET filaments; using two short fiber rovings as the coating layer and the twisted PBT / PET filaments as the core layer, a PBT / PET high-elasticity core-spun yarn is formed through a siro-spinning core-spun process; the melt blending parameters are: temperature 280℃, screw rotation speed 180r / min; the melt spinning parameters are: temperature 300℃, spinning speed 1200m / min; the PBT / PET filaments are twisted to obtain twisted PBT / PET filaments with a twist of 4 twists / cm; through adjusting the feeding speed and ratio of the short fiber roving and the PBT / PET filaments in the siro-spinning core-spun process, a PBT / PET high-elasticity core-spun yarn with a PBT / PET filament content of 40% is obtained.

[0036] Example 2: Step S1: gradually heat phenyltris(dimethylsiloxanyl)silane liquid to 107°C and keep for 35 min under nitrogen environment, then cool to 85°C, add Karstedt platinum gold catalyst, then add allyl glycidyl ether dropwise, after the dropwise addition is completed, heat to 107°C and keep for 2.3 h, and the epoxy silicone resin is obtained after the reaction is completed; the reaction molar ratio of phenyltris(dimethylsiloxanyl)silane and allyl glycidyl ether is 1:2.05;

[0037] Step S2: add eugenol and anhydrous potassium carbonate into tetrahydrofuran, stir uniformly to obtain eugenol solution; add hexachlorocyclotriphosphazene into tetrahydrofuran, stir uniformly to obtain hexachlorocyclotriphosphazene solution; add the hexachlorocyclotriphosphazene solution into the eugenol solution dropwise, stir for 70 min, then heat to 63°C, continue to reflux for 27 h, after the reaction is completed, concentrate, recrystallize, filter, wash, and dry to obtain vinyl-terminated cyclotriphosphazene; the reaction molar ratio of eugenol and hexachlorocyclotriphosphazene is 6.3:1;

[0038] Step S3: mix the epoxy silicone resin, Karstedt platinum gold catalyst, and vinyl-terminated cyclotriphosphazene under nitrogen environment, stir uniformly, then gradually heat to 107°C and keep for 2.3 h; then cool to 85°C, add Karstedt platinum gold catalyst again and keep for 25 min; then gradually heat to 107°C and keep for 2.2 h, after the reaction is completed, cool, and distill under reduced pressure to obtain the flame-retardant toughening agent; the reaction mass-volume ratio of epoxy silicone resin, vinyl-terminated cyclotriphosphazene, and Karstedt platinum gold catalyst is 40 g:9.5 g:0.02 mL;

[0039] Step S4: add carbon nanotubes into acid solution, ultrasonically disperse uniformly, then stir at 65°C for 4 h, after the reaction is completed, wash with water, filter, and dry to obtain modified carbon nanotubes; the acid solution includes 98wt% sulfuric acid and 68wt% nitric acid; when preparing the modified carbon nanotubes, the mass-volume ratio of carbon nanotubes, sulfuric acid, and nitric acid is 0.01 g:3 mL:1.6 mL;

[0040] Step S5: mixing the modified carbon nanotube, 1, 3-propanediamine, 1-ethyl-(3- dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution, ultrasonic reaction at 37 DEG C for 6h in a closed environment, after reaction, water filtration, drying, to obtain aminated carbon nanotube; adding the aminated carbon nanotube to deionized water, ultrasonic dispersion for 70 min, then adding hydrochloric acid to adjust the pH to 1.4, then adding aniline and cooling to 1 DEG C, magnetic stirring for 1.3h, then slowly adding 2.7g / mL ammonium persulfate solution, after the end of dropwise addition, continuing to react for 6.5h, after reaction, filtration, drying, to obtain polyaniline coated carbon nanotube; when preparing the aminated carbon nanotube, the mass volume ratio of the modified carbon nanotube, 1, 3-propanediamine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution is 1mg: 9mg: 5mg: 0.5mL; when preparing the polyaniline coated carbon nanotube, the mass volume ratio of the aminated carbon nanotube, aniline, ammonium persulfate solution is 1.7g: 1.3g: 15mL;

[0041] Step S6: mixing the modified carbon nanotube, polyetheramine, 1-ethyl-(3- dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution, ultrasonic reaction at 37 DEG C for 7.5h in a closed environment, after reaction, water filtration, drying, to obtain polyetheramine coated carbon nanotube; when preparing the polyetheramine coated carbon nanotube, the mass volume ratio of the modified carbon nanotube, polyetheramine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution is 1mg: 11mg: 5mg: 0.5mL;

[0042] Step S7: mechanically mixing 60g of dried PBT, 45g of PET, 12g of flame-retardant toughening agent, 5g of polyaniline coated carbon nanotube, and 2.5g of polyetheramine coated carbon nanotube, melt blending, extruding, granulating, and melt spinning to obtain PBT / PET filaments; using two short fiber rovings as the sheath layer and the twisted PBT / PET filaments as the core layer, a PBT / PET high-elasticity core-spun yarn is formed through a siro-spinning core-spun process; the melt blending parameters are: temperature 270 DEG C, screw rotation speed 170r / min; the melt spinning parameters are: temperature 290 DEG C, spinning speed 1000m / min; the PBT / PET filaments are twisted to obtain twisted PBT / PET filaments with a twist of 4 twists / cm; by adjusting the feeding speed and ratio of the short fiber roving and the PBT / PET filaments in the siro-spinning core-spun process, a PBT / PET high-elasticity core-spun yarn with a PBT / PET filament content of 37% is obtained.

[0043] Example 3: Step S1: gradually heat phenyltris(dimethylsiloxanyl)silane liquid to 105°C and keep for 30 min under nitrogen environment, then cool to 80°C, add Karstedt platinum gold catalyst, then add allyl glycidyl ether dropwise, after the dropwise addition is completed, heat to 105°C and keep for 2.0 h, and the epoxidized silicone resin is obtained after the reaction is completed; the reaction molar ratio of phenyltris(dimethylsiloxanyl)silane and allyl glycidyl ether is 1:2.05;

[0044] Step S2: add eugenol and anhydrous potassium carbonate into tetrahydrofuran, stir uniformly to obtain eugenol solution; add hexachlorocyclotriphosphazene into tetrahydrofuran, stir uniformly to obtain hexachlorocyclotriphosphazene solution; add the hexachlorocyclotriphosphazene solution into the eugenol solution dropwise, stir for 60 min, then heat to 60°C, continue to reflux for 25 h, after the reaction is completed, concentrate, recrystallize, filter, wash, and dry to obtain vinyl-terminated cyclotriphosphazene; the reaction molar ratio of eugenol and hexachlorocyclotriphosphazene is 6.3:1;

[0045] Step S3: mix the epoxidized silicone resin, Karstedt platinum gold catalyst, and vinyl-terminated cyclotriphosphazene under nitrogen environment, stir uniformly, then gradually heat to 105°C and keep for 2 h; then cool to 80°C, add Karstedt platinum gold catalyst again and keep for 20 min; then gradually heat to 105°C and keep for 2 h, after the reaction is completed, cool, and distill under reduced pressure to obtain the flame-retardant toughening agent; the reaction mass-volume ratio of the epoxidized silicone resin, vinyl-terminated cyclotriphosphazene, and Karstedt platinum gold catalyst is 40 g:9.5 g:0.02 mL;

[0046] Step S4: add carbon nanotubes into acid solution, ultrasonically disperse uniformly, then stir at 60°C for 3 h, after the reaction is completed, wash with water, filter, and dry to obtain modified carbon nanotubes; the acid solution includes 98wt% sulfuric acid and 68wt% nitric acid; when preparing the modified carbon nanotubes, the mass-volume ratio of carbon nanotubes, sulfuric acid, and nitric acid is 0.01 g:3 mL:1.6 mL;

[0047] Step S5: mixing the modified carbon nanotube, 1, 3-propanediamine, 1-ethyl-(3- dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution, ultrasonic reaction for 5.5h at 35℃ in a closed environment, after the reaction, water filtration, drying, to obtain the aminated carbon nanotube; adding the aminated carbon nanotube to deionized water, ultrasonic dispersion for 60min, then adding hydrochloric acid to adjust the pH to 1.3, then adding aniline and cooling to 0℃, magnetic stirring for 1h, then slowly adding 2.6g / mL ammonium persulfate solution, continuing to react for 6h after the end of the drop, after the reaction, filtration, drying, to obtain the polyaniline coated carbon nanotube; when preparing the aminated carbon nanotube, the mass volume ratio of the modified carbon nanotube, 1, 3-propanediamine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution is 1mg: 9mg: 5mg: 0.5mL; when preparing the polyaniline coated carbon nanotube, the mass volume ratio of the aminated carbon nanotube, aniline, ammonium persulfate solution is 1.7g: 1.3g: 15mL;

[0048] Step S6: mixing the modified carbon nanotube, polyetheramine, 1-ethyl-(3- dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution, ultrasonic reaction for 7h at 35℃ in a closed environment, after the reaction, water filtration, drying, to obtain the polyetheramine coated carbon nanotube; when preparing the polyetheramine coated carbon nanotube, the mass volume ratio of the modified carbon nanotube, polyetheramine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, sodium dihydrogen phosphate buffer solution is 1mg: 11mg: 5mg: 0.5mL;

[0049] Step S7: mechanically mixing the dried 60g PBT, 45g PET, 12g flame-retardant toughening agent, 5g polyaniline coated carbon nanotube, 2.5g polyetheramine coated carbon nanotube, melt blending, extruding granulation, melt spinning, to obtain the PBT / PET filament; through the siro spinning core-spun process, taking two short fiber rovings as the sheath layer and the twisted PBT / PET filament as the core layer, to form the PBT / PET high-elasticity core-spun yarn; the melt blending parameters are: temperature 260℃, screw rotation speed 160r / min; the melt spinning parameters are: temperature 280℃, spinning speed 900m / min; twisting the PBT / PET filament to obtain the twisted PBT / PET filament with twist 4twist / cm; through adjusting the feeding speed and ratio of the short fiber roving and the PBT / PET filament in the siro spinning core-spun process, to obtain the PBT / PET high-elasticity core-spun yarn with PBT / PET filament content of 35%.

[0050] Comparative Example 1: Remove the flame-retardant toughening agent, and the rest is the same as Example 1, the specific steps are as follows: Step S1: Add carbon nanotubes to acid solution, uniformly disperse by ultrasonic, and then stir at 70°C for 5h. After the reaction is completed, wash with water, suction filter, and dry to obtain modified carbon nanotubes; the acid solution comprises 98wt% sulfuric acid and 68wt% nitric acid; when preparing the modified carbon nanotubes, the mass-volume ratio of carbon nanotubes, sulfuric acid, and nitric acid is 0.01g:3mL:1.6mL;

[0051] Step S2: Mix the modified carbon nanotubes, 1,3-propanediamine, 1-ethyl-(3- dimethylaminopropyl) carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution, and ultrasonically react at 40°C for 6.5h in a closed environment. After the reaction is completed, suction filter with water, and dry to obtain aminated carbon nanotubes; add the aminated carbon nanotubes to deionized water, disperse by ultrasonic for 80min, then add hydrochloric acid to adjust the pH to 1.5, add aniline, and cool to 3°C for magnetic stirring for 1.5h, then slowly add 2.8g / mL ammonium persulfate solution, continue to react for 7h after the addition is completed, then suction filter and dry to obtain polyaniline-coated carbon nanotubes; when preparing the aminated carbon nanotubes, the mass-volume ratio of modified carbon nanotubes, 1,3-propanediamine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution is 1mg:9mg:5mg:0.5mL; when preparing the polyaniline-coated carbon nanotubes, the mass-volume ratio of aminated carbon nanotubes, aniline, and ammonium persulfate solution is 1.7g:1.3g:15mL;

[0052] Step S3: Mix the modified carbon nanotubes, polyetheramine, 1-ethyl-(3- dimethylaminopropyl) carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution, and ultrasonically react at 40°C for 8h in a closed environment. After the reaction is completed, suction filter with water, and dry to obtain polyetheramine-coated carbon nanotubes; when preparing the polyetheramine-coated carbon nanotubes, the mass-volume ratio of modified carbon nanotubes, polyetheramine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution is 1mg:11mg:5mg:0.5mL;

[0053] Step S4: 60 g of dried PBT, 45 g of PET, 5 g of polyaniline-coated carbon nanotubes, and 2.5 g of polyether amine-coated carbon nanotubes were mechanically mixed, melt blended, extruded, pelletized, and melt spun to obtain PBT / PET filaments; two short fiber rovings were used as the sheath layer, and the twisted PBT / PET filaments were used as the core layer to form PBT / PET high-elasticity core-spun yarns through a siro-spinning core-spun process; the melt blending parameters were a temperature of 280°C and a screw rotation speed of 180 r / min; the melt spinning parameters were a temperature of 300°C and a spinning speed of 1200 m / min; the PBT / PET filaments were twisted to obtain twisted PBT / PET filaments with a twist of 4 twists / cm; and the PBT / PET high-elasticity core-spun yarns with a PBT / PET filament content of 40% were obtained by adjusting the feeding speed and ratio of the short fiber rovings and the PBT / PET filaments in the siro-spinning core-spun process.

[0054] Comparative Example 2: The polyaniline-coated carbon nanotubes were removed, and the rest was the same as in Example 1, and the specific steps were as follows: Step S1: under a nitrogen environment, phenyltris(dimethylsiloxanyl)silane liquid was gradually heated to 110°C and kept for 40 min, then cooled to 90°C, Karstedt platinum gold catalyst was added again, and then allyl glycidyl ether was added dropwise, after the dropwise addition was completed, it was heated to 110°C and kept for 2.5 h, and the epoxidized silicone resin was obtained after the reaction was completed; the reaction molar ratio of phenyltris(dimethylsiloxanyl)silane and allyl glycidyl ether was 1:2.05;

[0055] Step S2: eugenol and anhydrous potassium carbonate were added to tetrahydrofuran, and after stirring uniformly, an eugenol solution was obtained; hexachlorocyclotriphosphazene was added to tetrahydrofuran, and after stirring uniformly, a hexachlorocyclotriphosphazene solution was obtained; the hexachlorocyclotriphosphazene solution was added dropwise to the eugenol solution, stirred for 80 min, heated to 65°C, and refluxed for 30 h, and after the reaction was completed, it was concentrated, recrystallized, suction filtered, washed, and dried to obtain a vinyl-terminated cyclotriphosphazene; the reaction molar ratio of eugenol and hexachlorocyclotriphosphazene was 6.3:1;

[0056] Step S3: under a nitrogen environment, the epoxidized silicone resin, Karstedt platinum gold catalyst, and vinyl-terminated cyclotriphosphazene were mixed and stirred uniformly, then gradually heated to 110°C and kept for 2.5 h; then cooled to 90°C, added Karstedt platinum gold catalyst again, and kept for 30 min; then gradually heated to 110°C and kept for 2.5 h, and after the reaction was completed, it was cooled, distilled under reduced pressure, and the flame-retardant toughening agent was obtained; the reaction mass-volume ratio of the epoxidized silicone resin, the vinyl-terminated cyclotriphosphazene, and the Karstedt platinum gold catalyst was 40 g:9.5 g:0.02 mL;

[0057] Step S4: carbon nanotubes were added to the acid solution, and after ultrasonic dispersion, they were stirred at 70°C for 5h. After the reaction was completed, the product was washed with water, filtered, and dried to obtain modified carbon nanotubes; the acid solution included 98wt% sulfuric acid and 68wt% nitric acid; when preparing the modified carbon nanotubes, the mass-volume ratio of carbon nanotubes, sulfuric acid, and nitric acid was 0.01g:3mL:1.6mL;

[0058] Step S5: the modified carbon nanotubes, polyether amine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution were mixed, and ultrasonic reaction was carried out at 40°C for 8h in a sealed environment. After the reaction was completed, the product was filtered with water and dried to obtain polyether amine-coated carbon nanotubes; when preparing the polyether amine-coated carbon nanotubes, the mass-volume ratio of modified carbon nanotubes, polyether amine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution was 1mg:11mg:5mg:0.5mL;

[0059] Step S6: 60g of dried PBT, 45g of PET, 12g of flame-retardant toughening agent, and 2.5g of polyether amine-coated carbon nanotubes were mechanically mixed, and then melt blended, extruded, and granulated, and finally melt spun to obtain PBT / PET filaments; two short fiber rovings were used as the sheath layer, and the twisted PBT / PET filaments were used as the core layer to form PBT / PET high-elasticity core-spun yarns through the siro-spinning core-spun process; the melt blending parameters were as follows: temperature was 280°C, and screw rotation speed was 180r / min; the melt spinning parameters were as follows: temperature was 300°C, and spinning speed was 1200m / min; the PBT / PET filaments were twisted to obtain twisted PBT / PET filaments with a twist of 4twist / cm; and by adjusting the feeding speed and ratio of the short fiber rovings and the PBT / PET filaments during the siro-spinning core-spun process, PBT / PET high-elasticity core-spun yarns with a PBT / PET filament content of 40% were obtained.

[0060] Comparative Example 3: polyether amine-coated carbon nanotubes and polyaniline-coated carbon nanotubes were both removed, and the rest was the same as in Example 1, and the specific steps were as follows: Step S1: under a nitrogen environment, phenyltris(dimethylsiloxanyl)silane liquid was gradually heated to 110°C and kept for 40min, then cooled to 90°C, Karstedt platinum gold catalyst was added, and then allyl glycidyl ether was added dropwise. After the dropwise addition was completed, the temperature was raised to 110°C and kept for 2.5h to obtain an epoxidized silicone resin; the reaction molar ratio of phenyltris(dimethylsiloxanyl)silane and allyl glycidyl ether was 1:2.05;

[0061] Step S2: eugenol, anhydrous potassium carbonate were added to tetrahydrofuran, and after stirring to obtain an eugenol solution; hexachlorocyclotriphosphazene was added to tetrahydrofuran, and after stirring to obtain a hexachlorocyclotriphosphazene solution; the hexachlorocyclotriphosphazene solution was added dropwise to the eugenol solution, and after stirring for 80 min, the temperature was increased to 65 DEG C, and the reflux reaction was continued for 30 h; after the reaction was completed, concentration, recrystallization, suction filtration, washing and drying were performed to obtain a vinyl-terminated cyclotriphosphazene; the reaction molar ratio of eugenol to hexachlorocyclotriphosphazene was 6.3:1;

[0062] Step S3: under a nitrogen environment, the epoxy silicone resin, Karstedt platinum gold catalyst and vinyl-terminated cyclotriphosphazene were mixed and stirred uniformly, and then gradually heated to 110 DEG C and kept for 2.5 h; then cooled to 90 DEG C, added Karstedt platinum gold catalyst and kept for 30 min; then gradually heated to 110 DEG C and kept for 2.5 h; after the reaction was completed, cooling and reduced pressure distillation were performed to obtain a flame-retardant toughening agent; the reaction mass / volume ratio of epoxy silicone resin, vinyl-terminated cyclotriphosphazene and Karstedt platinum gold catalyst was 40 g:9.5 g:0.02 mL;

[0063] Step S4: 60 g of dried PBT, 45 g of PET and 12 g of flame-retardant toughening agent were mechanically mixed, melt blended, extruded and granulated, and melt spun to obtain PBT / PET filaments; two short fiber rovings were used as the sheath layer, and the twisted PBT / PET filaments were used as the core layer to form PBT / PET high-elasticity core-spun yarn through the siro-spinning core-spun process; the melt blending parameters were: temperature 280 DEG C, screw rotation speed 180 r / min; the melt spinning parameters were: temperature 300 DEG C, spinning speed 1200 m / min; the PBT / PET filaments were twisted to obtain twisted PBT / PET filaments with a twist of 4 twists / cm; when the siro-spinning core-spun process was used, the feeding speed and ratio of the short fiber roving and the PBT / PET filaments were adjusted to obtain PBT / PET high-elasticity core-spun yarn with a PBT / PET filament content of 40%.

[0064] Detection test:

[0065] Mechanical property test: referring to GB / T 14344-2022 "Chemical fiber Filament tensile property test method", the PBT / PET filaments prepared by the present application were used as the sample, the gauge length was set to 250 mm, and the dynamic gripper speed was 1000 mm / min to test the elongation at break of the sample.

[0066] Flame retardant performance test: refer to GB / T 2406.2-2009 "Plastics-Determination of the burning behavior of plastics-Part 2: Guidance on the measurement of flame characteristics-Test method for vertical burning of films and sheets"; the PBT, PET, (flame-retardant toughening agent, polyaniline-coated carbon nanotube, polyether amine-coated carbon nanotube) raw materials in the examples / counter examples are mixed, melt blended, extruded, granulated, and injection molded to obtain dumbbell-shaped samples; the oxygen index value of the sample is tested and recorded.

[0067] Antistatic property test: refer to GB / T 1410-2006 "Solid Insulating Materials-Volume Resistivity and Surface Resistivity of Solid Insulating Materials-Test Methods"; the PBT, PET, (flame-retardant toughening agent, polyaniline-coated carbon nanotube, polyether amine-coated carbon nanotube) raw materials in the examples / counter examples are mixed, melt blended, extruded, granulated, and injection molded to obtain rectangular samples; the volume resistivity of the sample is tested by a volume-surface resistivity tester. The results are as follows:

[0068]

[0069] Conclusion: the amount of examples 1-3 remains unchanged, only the reaction parameters are modified. According to the experimental data, the performance of the sample does not change significantly. Counter example 1: remove the flame-retardant toughening agent, and the rest is the same as example 1. According to the experimental data, compared with example 1, the elongation at break is reduced to 108%, and the oxygen index is reduced to 23.9%. The analysis reason is that the flame-retardant toughening agent contains two flame-retardant structures of cyclotriphosphazene and siloxane, so it has good flame-retardant performance, so the oxygen index decreases after removing it. In addition, the siloxane molecular chain in the flame-retardant toughening agent has high flexibility and rotatability, so it has good toughness, so the elongation at break decreases after removing it.

[0070] Counter example 2: remove the polyaniline-coated carbon nanotube, and the rest is the same as example 1. According to the experimental data, compared with example 1, the elongation at break is reduced to 125%, the oxygen index is reduced to 26.8%, and the volume resistivity is increased to 4.6 x 10 6 Ω·cm. The analysis reason is that carbon nanotubes have certain mechanical properties and electrical conductivity, and polyaniline has good electrical conductivity, so polyaniline-coated carbon nanotubes have good antistatic property and mechanical property, so the elongation at break decreases and the volume resistivity increases after removing it. In addition, polyaniline-coated carbon nanotubes contain flame-retardant elements, so the flame-retardant property also decreases after removing them.

[0071] Counter example 3: remove both the polyaniline-coated carbon nanotube and the polyether amine-coated carbon nanotube, and the rest is the same as example 1. According to the experimental data, compared with example 1, the elongation at break is reduced to 121%, the oxygen index is reduced to 25.7%, and the volume resistivity is increased to 6.9 x 10 7Ω·cm, the analysis reason is: the comparative example 3 is based on the comparative example 2 further removes polyether amine coated carbon nanotubes, the polyether amine coated carbon nanotubes have similar properties with polyaniline coated carbon nanotubes, so after further removing, the elongation at break decreases, the volume resistivity increases, and the oxygen index decreases.

[0072] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0073] Finally, it should be noted that the above-mentioned only for the preferred embodiments of the present application, and not for the purpose of limiting the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement of the technical solutions described in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included within the scope of the present application.

Claims

1. A method for preparing abrasion-resistant PBT / PET high-elasticity core-spun yarn, characterized in that: The process includes the following steps: mechanically mixing dried PBT, PET, flame retardant toughening agent, and antistatic agent, followed by melt blending, extrusion granulation, and melt spinning to obtain PBT / PET filament; using two short fiber rovings as the covering layer and the twisted PBT / PET filament as the core layer, and forming a PBT / PET high-elastic core-spun yarn through Sirospun core-spun process; The preparation process of the flame retardant toughening agent is as follows: Step S1: Under nitrogen atmosphere, phenyltris(dimethylsiloxane)silane liquid is gradually heated to 105-110℃ and kept at that temperature for 30 min, then cooled to 80-90℃, Karstedt platinum catalyst is added, and then allyl alcohol glycidyl ether is added dropwise. After the addition is completed, the temperature is raised to 105-110℃ and kept at that temperature for 2 h. After the reaction is completed, epoxide resin is obtained. Step S2: Eugenol and anhydrous potassium carbonate are added to tetrahydrofuran and stirred until homogeneous to obtain an eugenol solution; hexachlorocyclotriphosphazene is added to tetrahydrofuran and stirred until homogeneous to obtain a hexachlorocyclotriphosphazene solution; the hexachlorocyclotriphosphazene solution is added dropwise to the eugenol solution, and the mixture is stirred for 60-80 min, then heated to 60-65 °C and refluxed for 25-30 h. After the reaction is completed, the mixture is concentrated, recrystallized, filtered, washed, and dried to obtain vinyl-terminated cyclotriphosphazene. Step S3: Under nitrogen atmosphere, epoxy resin, Karstedt platinum catalyst, and vinyl-terminated cyclotriphosphazene are mixed and stirred until homogeneous. The mixture is then gradually heated to 105-110℃ and kept at this temperature for 2.0-2.5 h. The temperature is then lowered to 80-90℃, and Karstedt platinum catalyst is added again and kept at this temperature for 20-30 min. The temperature is then gradually raised to 105-110℃ and kept at this temperature for 2.0-2.5 h. After the reaction is completed, the mixture is cooled and distilled under reduced pressure to obtain a flame retardant toughening agent. The molar ratio of phenyltris(dimethylsiloxane)silane to allyl alcohol glycidyl ether is 1:(2.0-2.1); the molar ratio of eugenol to hexachlorocyclotriphosphazene is (6.2-6.4):1; and the mass-volume ratio of epoxy resin, vinyl-terminated cyclotriphosphazene, and Karstedt platinum catalyst is 40 g:(9-10) g:0.02 mL. The antistatic agent comprises polyaniline-coated carbon nanotubes and polyetheramine-coated carbon nanotubes, with a mixing ratio of 2:

1. The specific preparation process is as follows: Step S1: Add carbon nanotubes to the acid solution, disperse them evenly by ultrasonication, and stir at 60-70℃ for 3-5 hours. After the reaction is completed, wash with water, filter and dry to obtain modified carbon nanotubes. Step S2: Modified carbon nanotubes, 1,3-propanediamine, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution are mixed and ultrasonically reacted at 35-40℃ for 5.5-6.5 h in a closed environment. After the reaction, the mixture is filtered with water and dried to obtain aminated carbon nanotubes. The aminated carbon nanotubes are added to deionized water and ultrasonically dispersed for 60-80 min. Hydrochloric acid is added to adjust the pH to 1.3-1.

5. Then aniline is added and the temperature is lowered to 0-3℃ and magnetically stirred for 1.0-1.5 h. Then 2.6-2.8 g / mL ammonium persulfate solution is slowly added dropwise. After the addition is completed, the reaction continues for 6-7 h. After the reaction is completed, the mixture is filtered and dried to obtain polyaniline-coated carbon nanotubes. Step S3: Mix modified carbon nanotubes, polyetheramine, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and sodium dihydrogen phosphate buffer solution, and sonicate them at 35-40℃ for 7-8 hours in a closed environment. After the reaction is completed, filter with water and dry to obtain polyetheramine-coated carbon nanotubes.

2. The method for preparing abrasion-resistant PBT / PET high-elasticity core-spun yarn according to claim 1, characterized in that: Melt blending parameters: temperature 260-280℃, screw speed 160-180r / min; melt spinning parameters: temperature 280-300℃, spinning speed 900-1200m / min.

3. The method for preparing abrasion-resistant PBT / PET high-elasticity core-spun yarn according to claim 1, characterized in that: PBT / PET filaments are twisted with an S-twist of 4-5 twists / cm to obtain twisted PBT / PET filaments. When using Siro spinning core-spun yarn, the feeding speed and ratio of short fiber roving and PBT / PET filaments are adjusted to obtain PBT / PET high-elastic core-spun yarn with a PBT / PET filament content of 35-40%.

4. The method for preparing abrasion-resistant PBT / PET high-elasticity core-spun yarn according to claim 1, characterized in that: The acid solution includes 97-98 wt% sulfuric acid and 65-68 wt% nitric acid; when preparing modified carbon nanotubes, the mass-to-volume ratio of carbon nanotubes, sulfuric acid, and nitric acid is 0.01 g: 3 mL: (1.5-1.7) mL; when preparing aminated carbon nanotubes, the mass-to-volume ratio of modified carbon nanotubes, 1,3-propanediamine, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution is 1 mg: (8-10) mg: 5 mg. mg: 0.5 mL; When preparing polyaniline-coated carbon nanotubes, the mass-volume ratio of aminated carbon nanotubes, aniline, and ammonium persulfate solution is (1.5-2.0) g: 1.3 g: 15 mL; When preparing polyetheramine-coated carbon nanotubes, the mass-volume ratio of modified carbon nanotubes, polyetheramine, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, and sodium dihydrogen phosphate buffer solution is 1 mg: (10-12) mg: 5 mg: 0.5 mL.

5. The method for preparing abrasion-resistant PBT / PET high-elasticity core-spun yarn according to claim 1, characterized in that: The composition of each component in PBT / PET filament is as follows (by mass fraction): 50-70 parts PBT, 40-50 parts PET, 10-15 parts flame retardant and toughening agent, 3-5 parts polyaniline-coated carbon nanotubes, and 1.5-2.5 parts polyetheramine-coated carbon nanotubes.

6. A wear-resistant PBT / PET high-elastic core-spun yarn, characterized in that: It is prepared by the preparation method according to any one of claims 1-5.

7. A method for producing fabric, characterized in that: The wear-resistant PBT / PET high-elastic core-spun yarn described in claim 6 is used as the weft yarn and woven together with the warp yarn to prepare the fabric.

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