Flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing

Abstract

The application discloses a high-speed sewing flame-retardant high-temperature-resistant sewing thread, which is prepared from raw materials including meta-aramid fiber, para-aramid fiber, polyimide fiber and modified aramid fiber. The sewing thread prepared by the method has high strength and high-temperature resistance, can realize high-speed sewing at 2500 m / min, and has good flame retardance, so that the processing performance and safety of the sewing thread are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flame-retardant fabrics, in particular to a flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing. BACKGROUND

[0002] Sewing thread is the thread required for knitted clothing products, which is twisted from two or more single yarns or filaments, and a small number of which is woven. It is more firm, uniform, smooth, elastic, and often has special finishing properties such as passing through the needle eye and suitable for sewing clothing, wear resistance, etc. Sewing thread is a raw material with a large consumption in clothing auxiliary materials, and its physical and chemical properties and product quality directly affect the production, wearability and appearance of the finished product. Its performance is also directly related to the labor productivity of the sewing industry, and is an indispensable product in people's lives. The classification of sewing thread follows the raw material classification method, including natural fiber sewing thread, synthetic fiber sewing thread and mixed sewing thread. Synthetic fiber sewing thread is currently the main sewing thread, which is made of filament fibers or staple fibers. It has the characteristics of high strength, good elasticity, wear resistance, low shrinkage rate and good chemical stability, and is mainly used for sewing of jeans, sportswear, leather products, wool and military uniforms. However, the widely used polyester sewing thread has poor high temperature resistance, and is easy to melt and block the needle eye during high-speed sewing, resulting in thread breakage, so it is not suitable for high-speed sewing of clothing. SUMMARY

[0003] Therefore, the present application provides a flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing, which comprises meta-aramid fiber, para-aramid fiber, polyimide fiber and modified aramid fiber, and the preparation process of the sewing thread comprises the following steps:

[0004] (1) mixing the fibers, opening the fiber mixture with a small carding machine, opening twice, and then carding the fiber bundle into a sliver on a carding machine, controlling the workshop humidity to be 65-68% during the carding process, and setting the sliver weight to be 17g / 5m;

[0005] (2) drawing the sliver, which needs to be drawn several times, and then drawing the sliver with a roller, setting the number of combined roots to be 8, setting the roller center distance to be 42x40x52, and setting the weight of the finished sliver to be 17g / 5m; the total draw ratio is 8 times, and the draw ratio of the rear zone is 1.2 times;

[0006] (3) the roving process is performed on a roving machine, the roving weight is controlled to be 3 g / 5 m, the draft ratio is 8 times, the back zone draft ratio is 1.3 times, the twist is controlled to be 5 twists / 10 cm, four roller double apron drafting is adopted, the spindle speed is set to be 425 r / min, the roller gauge is 52, 58, 65 mm in sequence, the roller pressure is set to be 18, 25, 20, 20 da N in sequence, the total draft ratio is 6.07, the back zone draft ratio is 1.2, and the twist factor is 52;

[0007] (4) the spinning process is performed on a spinning machine, the roller distance is 55, 64 mm in sequence, the roller pressure is 18, 12, 14 da N in sequence, the total draft ratio is 23.83, the back zone draft ratio is 1.263, the twist factor is 340, the spindle speed is 10000 r / min, and the sewing thread is obtained;

[0008] (5) the oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80 DEG C and kept, the silicone wax emulsion after constant temperature is transported to the oil storage pan, and part of the position of the roller is soaked in the silicone wax emulsion in the oil storage pan, when the sewing thread drags from the surface of the roller, the oiling of the sewing thread is completed, and the flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing is obtained after oiling.

[0009] Further, the preparation method of the modified arnos fiber is:

[0010] Step one, configure a sodium hydroxide solution, soak the arnos fiber in the sodium hydroxide solution for 60-80 min, after soaking, solid-liquid separation, wash the fiber with deionized water to remove residual lye, and obtain an alkali treated fiber;

[0011] Step two, configure a trihydroxymethyl aminomethane aqueous solution, stir the trihydroxymethyl aminomethane aqueous solution, add hydrochloric acid solution dropwise to the solution under stirring to adjust the pH of the solution to 8.5; then add dopamine hydrochloride to the solution under stirring, continue to stir the solution for more than 30 min after completing the feeding, then add the alkali treated fiber to the solution under stirring, continue to stir the solution for more than 20 h after completing the feeding, then solid-liquid separation, wash the solid phase with deionized water for more than 3 times, and dry at 50 DEG C for more than 10 h, to obtain a first modified fiber;

[0012] Step three, configuration of acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution; configuration of mixed aqueous solution of Tween 80, ethylene glycol, isopropanol; stirring the acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution, adding the mixed aqueous solution of Tween 80, ethylene glycol, isopropanol to the solution under stirring to obtain a mixed solution, stirring the mixed solution, adding the primary modified fiber to the mixed solution during stirring to obtain a suspension, heating the suspension to 55±3℃ in water bath under nitrogen atmosphere for more than 10 min, then adding vinyl dimethyl ethoxy silane and azobisdimethyl imidazole hydrochloride to the suspension under the condition of constant temperature stirring at 55±3℃ in nitrogen atmosphere, after completing the feeding, constant temperature stirring at 55±3℃ in nitrogen atmosphere for 4-5 h, then solid-liquid separation, washing the solid phase with deionized water and ethanol for 2 times respectively, drying at 50℃ for more than 10 h to obtain the modified arnos fiber.

[0013] Further, the raw materials are as follows in terms of mass fraction: meta-aramid fiber 50 parts, para-aramid fiber 6-10 parts, polyimide fiber 25-30 parts, and modified arnos fiber 20-30 parts.

[0014] Further, in step one, the mass percentage of sodium hydroxide in the sodium hydroxide solution is 8%-10%, and the solvent is water; the mass ratio of arnos fiber to the sodium hydroxide solution when the arnos fiber is soaked in the sodium hydroxide solution is 1:80.

[0015] Further, in step two, the concentration of tris-hydroxymethyl aminomethane in the tris-hydroxymethyl aminomethane aqueous solution is 0.13 g / mL, and the mass percentage of solute in the hydrochloric acid solution is 36%; the mass ratio of dopamine hydrochloride to the solution when dopamine hydrochloride is added to the solution is 0.2 g:100 mL; the mass ratio of the alkali-treated fiber to dopamine hydrochloride when the alkali-treated fiber is added is 1 g:0.2 g.

[0016] Further, in step three, the mass percentage of acryloyloxyethyl dimethyl benzyl ammonium chloride in the acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution is 10%, and the solvent is water; the concentration of Tween 80 in the mixed aqueous solution of Tween 80, ethylene glycol, and isopropanol is 5-8 g / L, the volume percentage of ethylene glycol is 10%-15%, the volume percentage of isopropanol is 8%-12%, and the solvent is water; the volume ratio of the acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution to the mixed aqueous solution of Tween 80, ethylene glycol, and isopropanol is 10:3-4.

[0017] Further, in the step three, the mass ratio of the mixed solution to the primary modified fiber is 50:1; the mass ratio of the vinyl dimethyl ethoxy silane and the azobisimidozolinium hydrochloride to the primary modified fiber is 3-4:0.6-0.8:1.

[0018] Further, the components of the silicone wax emulsion are dimethyl silicone oil 80-90 parts; paraffin wax 5-10 parts; palmitic acid 3-4 parts; Span-60 1-3 parts.

[0019] The sewing thread prepared by the method has high strength and high-temperature resistance, can realize high-speed sewing of 2500 m / min, and has good flame retardance, so that the processing performance and safety of the sewing thread are significantly improved. DETAILED DESCRIPTION

[0020] The application will be further described below in combination with examples.

[0021] Example 1

[0022] A flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing, raw materials including: meta-aramid fiber (Nomex aramid 1313 fiber of DuPont Company, LOI value 29.3%, the raw materials used in each example and comparative example are the same), para-aramid fiber (Kevlar aramid 1414 fiber of DuPont Company, LOI value 28%, the raw materials used in each example and comparative example are the same), polyimide fiber (Mianlon of Jiangsu Aoshen New Material, LOI value 28%, the raw materials used in each example and comparative example are the same), and modified aramid fiber (aramid fiber raw material is TANLON of Shanghai Te'anlon, LOI value 33%, the raw materials used in each example and comparative example are the same), and the mass fraction of each raw material is: meta-aramid fiber 50 parts, para-aramid fiber 6 parts, polyimide fiber 25 parts, and modified aramid fiber 20 parts. The preparation process of the sewing thread comprises the following steps:

[0023] (1) mixing each of the fibers, opening the fiber mixture with a small carding machine, opening for two times, and then combing the fiber bundle into a sliver on a carding machine, controlling the workshop humidity to be 65% during the combing process, and setting the sliver weight to be 17 g / 5 m;

[0024] (2) drawing the sliver, which needs to be turned over and drawn multiple times, and then drawing and thinning the drawn sliver with a roller, setting the number of combined roots to be 8, setting the roller center distance to be 42*40*52, and setting the weight of the drawn sliver to be 17 g / 5 m; the total draw ratio is 8 times, and the draw ratio of the rear area is 1.2 times;

[0025] (3) the roving process is carried out on a roving machine, the roving weight is controlled to be 3 g / 5 m, the draft ratio is 8 times, the back zone draft ratio is 1.3 times, the twist is controlled to be 5 twists / 10 cm, four roller double apron drafting is adopted, the spindle speed is set to be 425 r / min, the roller gauge is 52, 58, 65 mm in sequence, the roller pressure is set to be 18, 25, 20, 20 da N in sequence, the total draft ratio is 6.07, the back zone draft ratio is 1.2, and the twist factor is 52;

[0026] (4) the spinning process is carried out on a spinning machine, the roller distance is 55, 64 mm, the roller pressure is 18, 12, 14 da N in sequence, the total draft ratio is 23.83, the back zone draft ratio is 1.263, the twist factor is 340, the spindle speed is 10000 r / min, and the sewing thread is obtained;

[0027] (5) the oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80 DEG C and kept, the silicone wax emulsion after constant temperature is conveyed to the oil storage pan, part of the position of the roller is soaked in the silicone wax emulsion in the oil storage pan, when the sewing thread drags from the surface of the roller, the oiling of the sewing thread is completed, and the flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing is obtained after oiling, wherein the components of the silicone wax emulsion are dimethyl silicone oil 90 parts, paraffin wax 5 parts, palmitic acid 3 parts and Span-60 2 parts.

[0028] The preparation method of the modified arnos fiber is as follows:

[0029] Step one, configure a sodium hydroxide solution, the mass percentage of sodium hydroxide in the sodium hydroxide solution is 8%, and the solvent is water; the arnos fiber is soaked in the sodium hydroxide solution for 60 min, the mass ratio of the arnos fiber soaked in the sodium hydroxide solution is arnos fiber:sodium hydroxide solution = 1:80; after soaking, solid-liquid separation is carried out, the fiber is washed with deionized water to remove residual alkali liquor, and an alkali treated fiber is obtained;

[0030] Step two, configure the aqueous solution of tris-hydroxymethyl aminomethane, the concentration of tris-hydroxymethyl aminomethane in the aqueous solution is 0.13g / mL; stir the aqueous solution of tris-hydroxymethyl aminomethane, under the stirring state, add hydrochloric acid solution to the solution to adjust the pH of the solution to 8.5; the mass percentage of solute in the hydrochloric acid solution is 36%; then under the stirring state, add dopamine hydrochloride to the solution, the amount of dopamine hydrochloride added to the solution is 0.2g:100mL; after the addition is completed, continue to stir the solution for 30min, then under the stirring state, add the alkali-treated fiber to the solution, the mass ratio of the added alkali-treated fiber to the added dopamine hydrochloride is 1g:0.2g; after the addition is completed, continue to stir the solution for 20h, then solid-liquid separation, the solid phase is washed with deionized water for 3 times, and dried at 50℃ for 10h to obtain the first modified fiber;

[0031] Step three, configure the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride; the mass percentage of acryloyloxyethyl dimethyl benzyl ammonium chloride in the aqueous solution is 10%, and the solvent is water; configure the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol; the concentration of Tween 80 in the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol is 5g / L, the volume percentage of ethylene glycol is 15%, the volume percentage of isopropyl alcohol is 8%, and the solvent is water; stir the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride, add the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol to the solution under the stirring state to obtain a mixed solution, and the volume ratio of the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride to the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol is 10:3; stir the mixed solution, add the first modified fiber to the mixed solution during the stirring process to obtain a suspension, and the mass ratio of the mixed solution to the first modified fiber added to the mixed solution is 50:1; the suspension is heated to 55±3℃ in a water bath under a nitrogen atmosphere for 10min, then under the condition of constant temperature stirring at 55±3℃ in a nitrogen atmosphere, add vinyl dimethyl ethoxy silane and azobisdimethylimidazole hydrochloride to the suspension, and the mass ratio of the added vinyl dimethyl ethoxy silane and azobisdimethylimidazole hydrochloride to the added first modified fiber is 3:0.6:1; after the addition is completed, constant temperature stirring is carried out at 55±3℃ in a nitrogen atmosphere for 4h, then solid-liquid separation is carried out, the solid phase is washed with deionized water and ethanol for 2 times respectively, and dried at 50℃ for 10h to obtain the modified arsufone fiber.

[0032] Example 2

[0033] The application relates to a high-speed sewing flame-retardant high-temperature-resistant sewing thread, raw materials of which include meta-aramid fiber, para-aramid fiber, polyimide fiber and modified aramid fiber, wherein the raw materials are as follows in terms of mass fraction: 50 parts of meta-aramid fiber, 8 parts of para-aramid fiber, 27 parts of polyimide fiber and 24 parts of modified aramid fiber. The preparation process of the sewing thread comprises the following steps:

[0034] (1) mixing the fibers, opening the fiber mixture by using a small carding machine, carrying out the opening process twice, and carding the fiber bundle into a sliver on a carding machine after opening, wherein the workshop humidity is controlled to be 65% during the carding process, and the sliver weight is set to be 17 g / 5 m;

[0035] (2) drawing the sliver, needing to turn over and stretch multiple times during drawing, drawing the sliver by using a roller, setting the number of combined roots to be one and eight, setting the roller center distance to be 42*40*52, and setting the mature sliver weight to be 17 g / 5 m; the total draft ratio is 8 times, and the rear area draft ratio is 1.2 times;

[0036] (3) carrying out the roving process on a roving machine, controlling the roving weight to be 3 g / 5 m, the draft ratio to be 8 times, the rear area draft ratio to be 1.3 times, the twist degree to be 5 twists / 10 cm, adopting four-roller double-coil drafting, setting the spindle speed to be 425 r / min, and sequentially setting the roller spacing to be 52, 58 and 65 mm, and sequentially setting the roller pressure to be 18, 25, 20 and 20 da N; the total draft ratio is 6.07, the rear area draft ratio is 1.2, and the twist factor is 52;

[0037] (4) carrying out the spinning process on a spinning machine, setting the roller spacing to be 55 and 64 mm, sequentially setting the roller pressure to be 18, 12 and 14 da N, the total draft ratio to be 23.83, the rear area draft ratio to be 1.263, the twist factor to be 340, and the spindle speed to be 10000 r / min, so as to obtain the sewing thread;

[0038] (5) an oiling process, wherein the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80 DEG C and kept, the silicone wax emulsion after constant temperature is delivered to the oil storage pan, and the part of the roller is soaked in the silicone wax emulsion in the oil storage pan; when the sewing thread drags over the surface of the roller, the oiling of the sewing thread is completed, and the high-speed sewing flame-retardant high-temperature-resistant sewing thread is obtained after oiling, wherein the components of the silicone wax emulsion are as follows: 90 parts of dimethyl silicone oil, 5 parts of paraffin wax, 3 parts of palmitic acid and 2 parts of Span-60.

[0039] The preparation method of the modified aramid fiber is as follows:

[0040] Step one, configure sodium hydroxide solution, the mass percentage of sodium hydroxide in the sodium hydroxide solution is 8%, and the solvent is water;The said arnosulphonamide fiber is soaked in the sodium hydroxide solution for 60 min, the mass ratio of arnosulphonamide fiber to sodium hydroxide solution in the sodium hydroxide solution is 1:80;After soaking, solid-liquid separation is carried out, the fiber is washed with deionized water to remove residual lye, and the alkali treated fiber is obtained;

[0041] Step two, configure the aqueous solution of tris-hydroxymethyl aminomethane, the concentration of tris-hydroxymethyl aminomethane in the aqueous solution of tris-hydroxymethyl aminomethane is 0.13g / mL;Stir the aqueous solution of tris-hydroxymethyl aminomethane, and add hydrochloric acid solution dropwise to the solution under stirring to adjust the pH of the solution to 8.5;The mass percentage of solute in the hydrochloric acid solution is 36%;Then add dopamine hydrochloride to the solution under stirring, the amount ratio of dopamine hydrochloride to solution is 0.2g:100mL;After the addition is completed, continue to stir the solution for 30 min, then add the alkali treated fiber to the solution under stirring, the mass ratio of alkali treated fiber to dopamine hydrochloride is 1g:0.2g;After the addition is completed, continue to stir the solution for 20h, then solid-liquid separation is carried out, the solid phase is washed with deionized water for 3 times, and dried at 50℃ for 10h, to obtain the first modified fiber;

[0042] Step three, configuration of acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution; the mass percentage of acryloyloxyethyl dimethyl benzyl ammonium chloride in the acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution is 10%, and the solvent is water; configuration of the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol; the concentration of Tween 80 in the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol is 6g / L, the volume percentage of ethylene glycol is 12%, the volume percentage of isopropanol is 10%, and the solvent is water; stirring the acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution, adding the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol to the solution under stirring to obtain a mixed solution, the volume ratio of acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution and the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol is acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution: mixed aqueous solution of Tween 80, ethylene glycol and isopropanol = 10:3; stirring the mixed solution, adding the primary modified fiber to the mixed solution during stirring to obtain a suspension, the mass ratio of the mixed solution to the primary modified fiber is mixed solution: primary modified fiber = 50:1; the suspension is heated to 55±3℃ in a water bath under a nitrogen atmosphere for 10min, then vinyl dimethyl ethoxy silane and azobisimidozoline hydrochloride are added to the suspension under the condition of constant temperature stirring at 55±3℃ in a nitrogen atmosphere, the mass ratio of vinyl dimethyl ethoxy silane and azobisimidozoline hydrochloride to the mass of the primary modified fiber is vinyl dimethyl ethoxy silane: azobisimidozoline hydrochloride: primary modified fiber = 3:0.7:1; after the addition is completed, constant temperature stirring is carried out at 55±3℃ in a nitrogen atmosphere for 4h, then solid-liquid separation is carried out, the solid phase is washed with deionized water and ethanol for 2 times respectively, and is dried at 50℃ for 10h to obtain the modified arnos fiber.

[0043] Example 3

[0044] A flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing, raw materials including: meta-aramid fiber, para-aramid fiber, polyimide fiber and modified arnos fiber, each of the raw materials is 50 parts of meta-aramid fiber, 8 parts of para-aramid fiber, 28 parts of polyimide fiber and 28 parts of modified arnos fiber. The preparation process of the sewing thread comprises the following steps:

[0045] (1) mixing each of the fibers, opening the fiber mixture with a small carding machine, opening process is carried out twice, and the fiber bundle is carded into a sliver on a carding machine after opening, the workshop humidity is controlled to be 65% during carding, and the sliver setting is set to be 17g / 5m;

[0046] (2) the sliver is drawn, and the sliver needs to be turned over and drawn multiple times, and the sliver is drawn and thinned by rollers after drawing, the number of combined roots is set to one and eight, the roller center distance is set to 42*40*52, and the set top mass is 17 g / 5 m; the total draw ratio is 8 times, and the draw ratio in the rear area is 1.2 times;

[0047] (3) the roving process is performed on a roving machine, the roving set mass is controlled to be 3 g / 5 m, the draw ratio is 8 times, the draw ratio in the rear area is 1.3 times, the twist is controlled to be 5 twists / 10 cm, four roller double-coil drawing is adopted, the spindle speed is set to be 425 r / min, the roller spacing is 52, 58, and 65 mm in sequence, the roller pressure is set to be 18, 25, 20, and 20 da N in sequence, the total draw ratio is 6.07, the draw ratio in the rear area is 1.2, and the twist factor is 52;

[0048] (4) the spinning process is performed on a spinning machine, the roller spacing is 55 and 64 mm, the roller pressure is 18, 12, and 14 da N in sequence, the total draw ratio is 23.83, the draw ratio in the rear area is 1.263, the twist factor is 340, the spindle speed is 10,000 r / min, and the sewing thread is obtained;

[0049] (5) the oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80 DEG C and kept, the silicone wax emulsion after constant temperature is transported to the oil storage pan, and part of the position of the roller is soaked in the silicone wax emulsion in the oil storage pan. When the sewing thread drags over the surface of the roller, the oiling of the sewing thread is completed, and the flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing is obtained after oiling, wherein the components of the silicone wax emulsion are dimethyl silicone oil 90 parts, paraffin wax 5 parts, palmitic acid 3 parts, and Span-60 2 parts.

[0050] The preparation method of the modified aryl sulfone fiber is as follows:

[0051] Step one, configure a sodium hydroxide solution, the mass percentage of sodium hydroxide in the sodium hydroxide solution is 10%, and the solvent is water; the aryl sulfone fiber is soaked in the sodium hydroxide solution for 60 min, the mass ratio of the aryl sulfone fiber to the sodium hydroxide solution in the sodium hydroxide solution is 1:80; after soaking, solid-liquid separation is performed, the fiber is washed with deionized water to remove residual alkali, and an alkali-treated fiber is obtained;

[0052] Step two, configure the aqueous solution of tris-hydroxymethyl aminomethane, the concentration of tris-hydroxymethyl aminomethane in the aqueous solution is 0.13g / mL; stir the aqueous solution of tris-hydroxymethyl aminomethane, under the stirring state, add hydrochloric acid solution to the solution to adjust the pH of the solution to 8.5; the mass percentage of solute in the hydrochloric acid solution is 36%; then under the stirring state, add dopamine hydrochloride to the solution, the amount of dopamine hydrochloride added to the solution is 0.2g:100mL; after the addition is completed, continue to stir the solution for 30min, then under the stirring state, add the alkali-treated fiber to the solution, the mass ratio of the added alkali-treated fiber to the added dopamine hydrochloride is 1g:0.2g; after the addition is completed, continue to stir the solution for 20h, then solid-liquid separation, the solid phase is washed with deionized water for 3 times, and dried at 50℃ for 10h to obtain the first modified fiber;

[0053] Step three, configure the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride; the mass percentage of acryloyloxyethyl dimethyl benzyl ammonium chloride in the aqueous solution is 10%, and the solvent is water; configure the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol; the concentration of Tween 80 in the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol is 7g / L, the volume percentage of ethylene glycol is 12%, the volume percentage of isopropyl alcohol is 10%, and the solvent is water; stir the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride, add the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol to the solution under the stirring state to obtain a mixed solution, and the volume ratio of the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride to the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol is 10:4; stir the mixed solution, add the first modified fiber to the mixed solution during the stirring process to obtain a suspension, and the mass ratio of the mixed solution to the first modified fiber added to the mixed solution is 50:1; the suspension is heated to 55±3℃ in a water bath under a nitrogen atmosphere for 10min, then under the condition of constant temperature stirring at 55±3℃ in a nitrogen atmosphere, add vinyl dimethyl ethoxy silane and azobisimidozolin hydrochloride to the suspension, and the mass ratio of the added vinyl dimethyl ethoxy silane and azobisimidozolin hydrochloride to the added first modified fiber is 4:0.7:1; after the addition is completed, constant temperature stirring is carried out at 55±3℃ in a nitrogen atmosphere for 4h, then solid-liquid separation is carried out, the solid phase is washed with deionized water and ethanol for 2 times respectively, and dried at 50℃ for 10h to obtain the modified arsufone fiber.

[0054] Example 4

[0055] The application relates to a high-speed sewing flame-retardant high-temperature-resistant sewing thread, raw materials of which include meta-aramid fiber, para-aramid fiber, polyimide fiber and modified aramid fiber, wherein the raw materials are as follows in terms of mass fraction: 50 parts of meta-aramid fiber, 10 parts of para-aramid fiber, 30 parts of polyimide fiber and 30 parts of modified aramid fiber. The preparation process of the sewing thread comprises the following steps:

[0056] (1) mixing the fibers, opening the fiber mixture with a small carding machine, carrying out the opening process twice, and carding the fiber bundle into a sliver on a carding machine after opening, wherein the workshop humidity is controlled to be 65% during the carding process, and the sliver weight is set to be 17 g / 5 m;

[0057] (2) drawing the sliver, needing to turn over and stretch multiple times during drawing, drawing the drawn sliver with a roller, setting the number of combined roots to be one and eight, setting the roller center distance to be 42*40*52, and setting the mature sliver weight to be 17 g / 5 m; the total draft ratio is 8 times, and the rear zone draft ratio is 1.2 times;

[0058] (3) carrying out the roving process on a roving machine, controlling the roving weight to be 3 g / 5 m, the draft ratio to be 8 times, the rear zone draft ratio to be 1.3 times, the twist degree to be 5 twists / 10 cm, adopting four-roller double-coil drafting, setting the spindle speed to be 425 r / min, and setting the roller spacing to be 52, 58 and 65 mm in sequence, and setting the roller pressure to be 18, 25, 20 and 20 da N in sequence, the total draft ratio is 6.07, the rear zone draft ratio is 1.2, and the twist factor is 52;

[0059] (4) carrying out the spinning process on a spinning machine, the roller spacing is 55 and 64 mm, the roller pressure is 18, 12 and 14 da N in sequence, the total draft ratio is 23.83, the rear zone draft ratio is 1.263, the twist factor is 340, the spindle speed is 10000 r / min, and the sewing thread is obtained;

[0060] (5) the oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80 DEG C and kept, the silicone wax emulsion after constant temperature is conveyed to the oil storage pan, and the part of the roller is soaked in the silicone wax emulsion in the oil storage pan, when the sewing thread drags through the surface of the roller, the oiling of the sewing thread is completed, and the high-speed sewing flame-retardant high-temperature-resistant sewing thread is obtained after oiling, wherein the components of the silicone wax emulsion are as follows: 90 parts of dimethyl silicone oil, 5 parts of paraffin wax, 3 parts of palmitic acid and 2 parts of Span-60.

[0061] The preparation method of the modified aramid fiber is as follows:

[0062] Step one, configure sodium hydroxide solution, the mass percentage of sodium hydroxide in the sodium hydroxide solution is 10%, and the solvent is water; the arnosulphonamide fiber is soaked in the sodium hydroxide solution for 60 min, the mass ratio of the arnosulphonamide fiber soaked in the sodium hydroxide solution is arnosulphonamide fiber:sodium hydroxide solution = 1:80; after soaking, solid-liquid separation is carried out, the fiber is washed with deionized water to remove residual lye, and the alkali treated fiber is obtained;

[0063] Step two, configure a tris-hydroxymethyl aminomethane aqueous solution, the concentration of tris-hydroxymethyl aminomethane in the tris-hydroxymethyl aminomethane aqueous solution is 0.13 g / mL; the tris-hydroxymethyl aminomethane aqueous solution is stirred, and hydrochloric acid solution is added dropwise to the solution under stirring to adjust the pH of the solution to 8.5; the mass percentage of solute in the hydrochloric acid solution is 36%; then dopamine hydrochloride is added to the solution under stirring, and the amount ratio of dopamine hydrochloride added to the solution is dopamine hydrochloride:solution = 0.2 g:100 mL; after the addition is completed, the solution is continuously stirred for 30 min, then the alkali treated fiber is added to the solution under stirring, and the mass ratio of the alkali treated fiber added to the mass of dopamine hydrochloride added is alkali treated fiber:dopamine hydrochloride = 1 g:0.2 g; after the addition is completed, the solution is continuously stirred for 20 h, then solid-liquid separation is carried out, the solid phase is washed with deionized water for 3 times, and is dried at 50 DEG C for 10 h, and the first modified fiber is obtained;

[0064] Step three, configuration of acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution; the mass percentage of acryloyloxyethyl dimethyl benzyl ammonium chloride in the acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution is 10%, and the solvent is water; configuration of the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol; the concentration of Tween 80 in the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol is 8g / L, the volume percentage of ethylene glycol is 10%, the volume percentage of isopropanol is 12%, and the solvent is water; stirring the acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution, adding the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol to the solution under stirring to obtain a mixed solution, the volume ratio of acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution and the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol is acryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution: mixed aqueous solution of Tween 80, ethylene glycol and isopropanol = 10:4; stirring the mixed solution, adding the first modified fiber to the mixed solution during stirring to obtain a suspension, the mass ratio of the mixed solution to the first modified fiber is mixed solution: first modified fiber = 50:1; the suspension is heated to 55±3℃ in a water bath under a nitrogen atmosphere for 10min, then vinyl dimethyl ethoxy silane and azobisimidozolin hydrochloride are added to the suspension under the condition of constant temperature stirring at 55±3℃ in a nitrogen atmosphere, the mass ratio of vinyl dimethyl ethoxy silane and azobisimidozolin hydrochloride to the mass of the first modified fiber is vinyl dimethyl ethoxy silane: azobisimidozolin hydrochloride: first modified fiber = 4:0.8:1; after the addition is completed, constant temperature stirring is carried out at 55±3℃ in a nitrogen atmosphere for 4h, then solid-liquid separation is carried out, the solid phase is washed with deionized water and ethanol for 2 times respectively, and is dried at 50℃ for 10h to obtain the modified arnos fiber.

[0065] Comparative example 1

[0066] A sewing thread as a comparison, raw materials include: meta-aramid fiber, para-aramid fiber, polyimide fiber and arnos fiber, each of the raw materials is 50 parts of meta-aramid fiber, 8 parts of para-aramid fiber, 28 parts of polyimide fiber and 28 parts of arnos fiber. The preparation process of the sewing thread comprises the following steps:

[0067] (1) mixing each of the fibers, opening the fiber mixture with a small carding machine, carrying out the opening process twice, and carding the fiber bundle into a fiber strip on a carding machine after opening, controlling the workshop humidity to be 65% during carding, and setting the sliver weight to be 17g / 5m;

[0068] (2) the fiber sliver is drawn, and needs to be turned over for multiple times of drafting, and the drawn sliver is drawn out and thinned by rollers, the number of combined roots is set to one and eight, the roller center distance is set to 42x40x52, and the mature sliver weight is 17 g / 5 m; the total draft ratio is 8 times, and the back zone draft ratio is 1.2 times;

[0069] (3) the roving process is performed on a roving machine, the roving weight is controlled to be 3 g / 5 m, the draft ratio is 8 times, the back zone draft ratio is 1.3 times, the twist is controlled to be 5 twists / 10 cm, four roller double-coil drafting is adopted, the spindle speed is set to be 425 r / min, the roller spacing is 52, 58, and 65 mm in sequence, the roller pressure is set to be 18, 25, 20, and 20 da N in sequence, the total draft ratio is 6.07, the back zone draft ratio is 1.2, and the twist factor is 52;

[0070] (4) the spinning process is performed on a spinning machine, the roller spacing is 55 and 64 mm, the roller pressure is 18, 12, and 14 da N in sequence, the total draft ratio is 23.83, the back zone draft ratio is 1.263, the twist factor is 340, the spindle speed is 10,000 r / min, and the sewing thread in the pair of the comparison is obtained;

[0071] (5) the oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80 DEG C and kept, the silicone wax emulsion after constant temperature is transported to the oil storage pan, and part of the position of the roller is soaked in the silicone wax emulsion in the oil storage pan, when the sewing thread drags over the surface of the roller, the oiling of the sewing thread is completed, and the flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing is obtained after oiling, wherein the components of the silicone wax emulsion are dimethyl silicone oil 90 parts, paraffin wax 5 parts, palmitic acid 3 parts, and Span-60 2 parts.

[0072] Comparative Example 2

[0073] A sewing thread as a comparison, raw materials include: meta-aramid fiber, para-aramid fiber, polyimide fiber and modified aryl sulfone fiber, each of the raw materials is 50 parts of meta-aramid fiber, 8 parts of para-aramid fiber, 28 parts of polyimide fiber, and 28 parts of modified aryl sulfone fiber. The preparation process of the sewing thread comprises the following steps:

[0074] (1) each of the fibers is mixed, the fiber mixture is opened by a small carding machine, the opening process is performed twice, and the fiber bundle is carded into a sliver on a carding machine after opening; the workshop humidity is controlled to be 65% during the carding process, and the sliver weight is set to be 17 g / 5 m;

[0075] (2) the slivers are parallel-drawing, and need to be turned over and drawn many times, and the parallel-drawing is drawn and thinned by rollers, the number of parallel-drawing is set to 1 and 8, the roller center distance is set to 42x40x52, the set top yarn weight is 17g / 5m; the total draw ratio is 8 times, and the back zone draw ratio is 1.2 times;

[0076] (3) the roving process is performed on a roving machine, the roving weight is controlled to be 3g / 5m, the draw ratio is 8 times, the back zone draw ratio is 1.3 times, the twist is controlled to be 5 twists / 10cm, four-roller double-coil drawing is adopted, the spindle speed is set to be 425r / min, the roller spacing is 52, 58 and 65mm in sequence, the roller pressure is set to be 18, 25, 20 and 20da N in sequence, the total draw ratio is 6.07, the back zone draw ratio is 1.2, and the twist factor is 52;

[0077] (4) the spinning process is performed on a spinning machine, the roller spacing is 55 and 64mm, the roller pressure is 18, 12 and 14da N in sequence, the total draw ratio is 23.83, the back zone draw ratio is 1.263, the twist factor is 340, the spindle speed is 10000r / min, and the sewing thread described in the pair of examples is obtained;

[0078] (5) the oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80℃ and kept, the silicone wax emulsion after constant temperature is transported to the oil storage pan, part of the position of the roller is soaked in the silicone wax emulsion in the oil storage pan, when the sewing thread drags from the surface of the roller, the oiling of the sewing thread is completed, and the flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing is obtained after oiling, wherein the components of the silicone wax emulsion are dimethyl silicone oil 90 parts, paraffin wax 5 parts, palmitic acid 3 parts and Span-60 2 parts.

[0079] The preparation method of the modified aryl sulfone fiber is as follows:

[0080] Step one, configure the aqueous solution of tris-hydroxymethyl aminomethane, the concentration of tris-hydroxymethyl aminomethane in the aqueous solution of tris-hydroxymethyl aminomethane is 0.13g / mL; stir the aqueous solution of tris-hydroxymethyl aminomethane, under the stirring state, add hydrochloric acid solution to the solution to adjust the pH of the solution to 8.5; the mass percentage of solute in the hydrochloric acid solution is 36%; then under the stirring state, add dopamine hydrochloride to the solution, the amount of dopamine hydrochloride added to the solution is 0.2g:100mL; after the completion of the feeding, continue to stir the solution for 30min, then under the stirring state, add arsulfonamide fiber to the solution, the mass ratio of the added arsulfonamide fiber to the added dopamine hydrochloride is arsulfonamide fiber:dopamine hydrochloride = 1g:0.2g; after the completion of the feeding, continue to stir the solution for 20h, then solid-liquid separation, the solid phase is washed with deionized water for 3 times, and dried at 50℃ for 10h to obtain the once modified fiber of the present comparative example;

[0081] Step two, configure the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride; the mass percentage of acryloyloxyethyl dimethyl benzyl ammonium chloride in the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride is 10%, and the solvent is water; configure the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol; the concentration of Tween 80 in the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol is 7g / L, the volume percentage of ethylene glycol is 12%, the volume percentage of isopropyl alcohol is 10%, and the solvent is water; stir the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride, add the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol to the solution under the stirring state to obtain a mixed solution, the mixed volume ratio of the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride and the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol is acryloyloxyethyl dimethyl benzyl ammonium chloride mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol = 10:4; stir the mixed solution, add the once modified fiber to the mixed solution during the stirring process to obtain a suspension, the mass ratio of the mixed solution to the once modified fiber added to the mixed solution is mixed solution: once modified fiber = 50:1; the suspension is heated to 55±3℃ in a water bath under a nitrogen atmosphere for 10min, then under the condition of constant temperature stirring at 55±3℃ in a nitrogen atmosphere, add vinyl dimethyl ethoxy silane and azobisdimethylimidazole hydrochloride to the suspension, the mass ratio of the added vinyl dimethyl ethoxy silane and azobisdimethylimidazole hydrochloride to the added once modified fiber is vinyl dimethyl ethoxy silane: azobisdimethylimidazole hydrochloride: once modified fiber = 4:0.7:1; after the completion of the feeding, constant temperature stirring at 55±3℃ in a nitrogen atmosphere for 4h, then solid-liquid separation, the solid phase is washed with deionized water and ethanol for 2 times respectively, and dried at 50℃ for 10h to obtain the modified arsulfonamide fiber.

[0082] Comparative Example 3

[0083] A contrast sewing thread, raw materials include: meta-aramid fiber, para-aramid fiber, polyimide fiber and modified aramid fiber, each of the raw materials is 50 parts of meta-aramid fiber, 8 parts of para-aramid fiber, 28 parts of polyimide fiber and 28 parts of modified aramid fiber. The preparation process of the sewing thread comprises the following steps:

[0084] (1) mixing each of the fibers, the fiber mixture is opened by a small carding machine, the opening process is performed twice, and the opened fibers are carded into a sliver on a carding machine, the workshop humidity is controlled to be 65% during the carding process, and the sliver weight is set to be 17 g / 5 m;

[0085] (2) the sliver is drawn, the sliver needs to be turned over and stretched multiple times, the sliver is drawn and thinned by rollers after drawing, the number of combined roots is set to be 8, the roller center distance is set to be 42*40*52, and the mature sliver weight is 17 g / 5 m; the total draft ratio is 8 times, and the back zone draft ratio is 1.2 times;

[0086] (3) the roving process is performed on a roving machine, the roving weight is controlled to be 3 g / 5 m, the draft ratio is 8 times, the back zone draft ratio is 1.3 times, the twist is controlled to be 5 twists / 10 cm, four roller double-coil drafting is adopted, the spindle speed is set to be 425 r / min, the roller spacing is 52, 58 and 65 mm in sequence, the roller pressure is set to be 18, 25, 20 and 20 da N in sequence, the total draft ratio is 6.07, the back zone draft ratio is 1.2, and the twist factor is 52;

[0087] (4) the spinning process is performed on a spinning machine, the roller spacing is 55 and 64 mm, the roller pressure is 18, 12 and 14 da N in sequence, the total draft ratio is 23.83, the back zone draft ratio is 1.263, the twist factor is 340, the spindle speed is 10,000 r / min, and the sewing thread in the example is obtained;

[0088] (5) the oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80°C and kept, the silicone wax emulsion after constant temperature is transported to the oil storage pan, and part of the position of the roller is soaked in the silicone wax emulsion in the oil storage pan. When the sewing thread is dragged over the surface of the roller, the oiling of the sewing thread is completed, and the flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing is obtained after oiling, wherein the components of the silicone wax emulsion are dimethyl silicone oil 90 parts, paraffin wax 5 parts, palmitic acid 3 parts and Span-60 2 parts.

[0089] The preparation method of the modified aramid fiber is as follows:

[0090] Step one, configure sodium hydroxide solution, the mass percentage of sodium hydroxide in the sodium hydroxide solution is 10%, the solvent is water; the arnosulfonyl nylon fiber is soaked in the sodium hydroxide solution for 60 min, the mass ratio of the arnosulfonyl nylon fiber soaked in the sodium hydroxide solution is arnosulfonyl nylon fiber: sodium hydroxide solution = 1:80; after soaking, solid-liquid separation, the fiber is washed with deionized water to remove residual lye, and the alkali treated fiber is obtained;

[0091] Step two, configure the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride; the mass percentage of acryloyloxyethyl dimethyl benzyl ammonium chloride in the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride is 10%, and the solvent is water; configure the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol; the concentration of Tween 80 in the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol is 7 g / L, the volume percentage of ethylene glycol is 12%, the volume percentage of isopropanol is 10%, and the solvent is water; stir the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride, add the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol to the solution under stirring to obtain a mixed solution, the mixed volume ratio of the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride and the mixed aqueous solution of Tween 80, ethylene glycol and isopropanol is aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride: mixed aqueous solution of Tween 80, ethylene glycol and isopropanol = 10:4; stir the mixed solution, add the alkali treated fiber to the mixed solution during stirring to obtain a suspension, the mass ratio of the mixed solution to the alkali treated fiber added to the mixed solution is mixed solution: alkali treated fiber = 50:1; the suspension is heated to 55±3℃ in a water bath under a nitrogen atmosphere, and then vinyl dimethyl ethoxy silane and azobisimidozolin hydrochloride are added to the suspension under the condition of constant temperature stirring at 55±3℃ in a nitrogen atmosphere, the mass ratio of vinyl dimethyl ethoxy silane and azobisimidozolin hydrochloride to the alkali treated fiber is vinyl dimethyl ethoxy silane: azobisimidozolin hydrochloride: alkali treated fiber = 4:0.7:1; after the addition is completed, constant temperature stirring is carried out at 55±3℃ in a nitrogen atmosphere for 4 h, then solid-liquid separation is carried out, the solid phase is washed with deionized water and ethanol for 2 times respectively, and the modified arnosulfonyl nylon fiber is obtained by drying at 50℃ for 10 h.

[0092] Comparative example 4

[0093] A sewing thread as a comparison, raw materials include: meta-aramid fiber, para-aramid fiber, polyimide fiber and modified arnosulfonyl nylon fiber, each of the raw materials is 50 parts of meta-aramid fiber, 8 parts of para-aramid fiber, 28 parts of polyimide fiber and 28 parts of modified arnosulfonyl nylon fiber. The preparation process of the sewing thread comprises the following steps:

[0094] (1) The fibers are mixed, the fiber mixture is opened with a small carding machine, the opening process is performed twice, and the opened fibers are carded into slivers on a carding machine. The workshop humidity is controlled to be 65% during the carding process, and the sliver weight is set to be 17 g / 5 m;

[0095] (2) The slivers are drawn, and multiple turns are required during drawing. The drawn slivers are drawn and thinned with rollers, the number of combined roots is set to be 8, the roller center distance is set to be 42x40x52, and the finished sliver weight is 17 g / 5 m. The total draft ratio is 8 times, and the back zone draft ratio is 1.2 times.

[0096] (3) The roving process is performed on a roving machine, the roving weight is controlled to be 3 g / 5 m, the draft ratio is 8 times, the back zone draft ratio is 1.3 times, the twist is controlled to be 5 twists / 10 cm, the four-roller double-coil drafting is adopted, the spindle speed is set to be 425 r / min, the roller spacing is 52, 58, and 65 mm respectively, the roller pressure is set to be 18, 25, 20, and 20 da N respectively, the total draft ratio is 6.07, the back zone draft ratio is 1.2, and the twist factor is 52.

[0097] (4) The spinning process is performed on a spinning machine, the roller spacing is 55 and 64 mm respectively, the roller pressure is 18, 12, and 14 da N respectively, the total draft ratio is 23.83, the back zone draft ratio is 1.263, the twist factor is 340, the spindle speed is 10,000 r / min, and the sewing thread of the pair of examples is obtained.

[0098] (5) The oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80℃ and kept, the silicone wax emulsion after constant temperature is transported to the oil storage tank, part of the position of the roller is soaked in the silicone wax emulsion in the oil storage tank, when the sewing thread drags over the surface of the roller, the oiling of the sewing thread is completed, and the flame-retardant high-temperature-resistant sewing thread for high-speed sewing is obtained after oiling, wherein the components of the silicone wax emulsion are dimethyl silicone oil 90 parts, paraffin wax 5 parts, palmitic acid 3 parts, and Span-60 2 parts.

[0099] The preparation method of the modified aryl sulfone fiber is as follows:

[0100] Step one, configure a sodium hydroxide solution, the mass percentage of sodium hydroxide in the sodium hydroxide solution is 10%, and the solvent is water; the aryl sulfone fiber is soaked in the sodium hydroxide solution for 60 min, the mass ratio of the aryl sulfone fiber to the sodium hydroxide solution is 1:80, the fiber is washed with deionized water to remove residual alkali after solid-liquid separation, and an alkali-treated fiber is obtained.

[0101] Step two, configure a water solution of trimethylol aminomethane, the concentration of trimethylol aminomethane in the water solution is 0.13 g / mL; stir the water solution of trimethylol aminomethane, and drop hydrochloric acid solution into the solution under stirring to adjust the pH of the solution to 8.5; the mass percentage of solute in the hydrochloric acid solution is 36%; then add dopamine hydrochloride into the solution under stirring, the ratio of dopamine hydrochloride to the solution is 0.2 g:100 mL; continue to stir the solution for 30 min after the completion of the feeding, then add the alkali treated fiber into the solution under stirring, the mass ratio of the alkali treated fiber to dopamine hydrochloride is 1 g:0.2 g; continue to stir the solution for 20 h after the completion of the feeding, then perform solid-liquid separation, wash the solid phase with deionized water for 3 times, and dry at 50℃ for 10 h to obtain the modified fiber, which is the modified arnos fiber in the present comparative example.

[0102] Example 5

[0103] The breaking strength of the sewing thread prepared by the method described in each of the above examples and comparative examples is tested according to the requirements of standard GB / T3916-2013, wherein the clamping length is set to 250 mm, the tensile speed is set to 250 mm / min, the pre-tension is (0.05±0.01) cN / dtex, and each group is tested for 10 times to take the average value; the thermal weight loss performance of the sewing thread prepared by the method described in each of the above examples and comparative examples is analyzed by using a thermal gravimetric analyzer, and the temperature value at 5% weight loss is calculated, the nitrogen flow rate is set to 20 mL / min, the temperature rising speed is 20℃ / min, and the temperature range is 50-800℃, and the results are shown in Table 1.

[0104] As shown in Table 1, the sewing thread prepared by the method described in the present application has high strength and high temperature resistance, and can realize high-speed sewing of 2500 m / min, and the processing performance and safety of the sewing thread are significantly improved due to the good flame retardance of the fiber itself. This is mainly because, in the present application, the surface of the arnos fiber is first hydrolyzed after alkali treatment to form activated amide groups, the content of the active groups on the fiber surface is increased by subsequent dopamine hydrochloride treatment to obtain a strong adsorption fiber surface, which provides more binding sites for subsequent cross-linking and promotes the cross-linking reaction. Then the activated amide groups are cross-linked into a network structure through cross-linking reaction, thereby improving the strength and stability of the fiber and improving the heat resistance.

[0105] Table 1

[0106] Test group Breaking strength (cN / dtex) Temperature value at 5% weight loss (°C) Example 1 30.59 478.9 Example 2 30.62 480.3 Example 3 30.68 480.8 Example 4 30.54 478.2 Comparative Example 1 22.17 433.6 Comparative Example 2 24.40 450.4 Comparative Example 3 25.66 459.0 Comparative Example 4 25.05 458.1

[0107] The technical solutions provided by the present application are described in detail above. For those skilled in the art, the specific implementation manners and application scopes can be changed according to the idea of the embodiments of the present application. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A flame retardant high temperature resistant sewing thread for high speed sewing, characterized in that, The raw materials include, by mass fraction: meta-aramid fiber 50 parts, para-aramid fiber 6-10 parts, polyimide fiber 25-30 parts, and modified arnosulfonamide fiber 20-30 parts, The preparation method of the modified arnosulfonamide fiber is: Step one, configure a sodium hydroxide solution, soak the arnosulfonamide fiber in the sodium hydroxide solution for 60-80 min, after soaking, separate the solid and liquid, wash the fiber with deionized water to remove residual lye, and obtain the alkali-treated fiber; Step two, configure an aqueous solution of tris-hydroxymethyl aminomethane, stir the aqueous solution of tris-hydroxymethyl aminomethane, and add hydrochloric acid solution dropwise to the solution under stirring to adjust the pH of the solution to 8.5; then add dopamine hydrochloride to the solution under stirring, continue to stir the solution for more than 30 min, then add the alkali-treated fiber to the solution under stirring, continue to stir the solution for more than 20 h, then separate the solid and liquid, wash the solid with deionized water for more than three times, and dry at 50°C for more than 10 h to obtain the first modified fiber; Step three, configure an aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride with a mass percentage of 10%, and the solvent is water; configure a mixed aqueous solution of Tween 80, ethylene glycol, and isopropyl alcohol; stir the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride, add the mixed aqueous solution of Tween 80, ethylene glycol, and isopropyl alcohol to the solution under stirring to obtain a mixed solution, the volume ratio of the aqueous solution of acryloyloxyethyl dimethyl benzyl ammonium chloride to the mixed aqueous solution of Tween 80, ethylene glycol, and isopropyl alcohol is 10:3-4; stir the mixed solution, add the first modified fiber to the mixed solution during stirring to obtain a suspension, the mass ratio of the mixed solution to the first modified fiber is 50:1; heat the suspension to 55±3°C in a water bath under a nitrogen atmosphere for more than 10 min, then add vinyl dimethyl ethoxy silane and azobisimidozolinium hydrochloride to the suspension under constant temperature stirring at 55±3°C in a nitrogen atmosphere, the mass ratio of vinyl dimethyl ethoxy silane to azobisimidozolinium hydrochloride to the first modified fiber is 3-4:0.6-0.8:1; after the addition is completed, continue to stir at 55±3°C in a nitrogen atmosphere for 4-5 h, then separate the solid and liquid, wash the solid with deionized water and ethanol each for two times, and dry at 50°C for more than 10 h to obtain the modified arnosulfonamide fiber; The preparation process of the sewing thread comprises the following steps: (1) Mix the fibers, open the fiber mixture with a small carding machine, perform the opening process twice, and card the fibers into a fiber strip on a carding machine, control the workshop humidity to be 65%-68% during the carding process, and set the sliver weight to be 17 g / 5 m; (2) the slivers are drawn together, and need to be turned over and drawn several times, and the slivers are drawn out and thinned by rollers after drawing, the number of combined roots is set to 1 combined 8 roots, the roller center distance is set to 42mm*40mm*52mm, the mature sliver weight is 17g / 5m; the total draft ratio is 8 times, and the back zone draft ratio is 1.2 times; (3) the roving process is carried out on the roving frame, the control roving weight is 3g / 5m, the draft ratio is 8 times, the back zone draft ratio is 1.3 times, the twist is controlled to be 5 twists / 10cm, four roller double rubber ring drafting is adopted, the spindle speed is set to 425r / min, the roller spacing is 52, 58, 65mm in turn, the roller pressure is set to be 18, 25, 20, 20da N in turn, and the twist factor is 52; (4) the spinning process is carried out on the spinning frame, the roller spacing is 55, 64mm, the roller pressure is 18, 12, 14da N in turn, the total draft ratio is 23.83, the back zone draft ratio is 1.263, the twist factor is 340, the spindle speed is 10000r / min, and the sewing thread is obtained; (5) the oiling process, the silicone wax emulsion is poured into the oil pan of the oiling machine, the silicone wax emulsion is heated to 80℃ and kept, the silicone wax emulsion after constant temperature is conveyed to the oil storage pan, part of the position of the roller is soaked in the silicone wax emulsion in the oil storage pan, when the sewing thread drags over the surface of the roller, the oiling of the sewing thread is completed, and the flame-retardant high-temperature-resistant sewing thread applied to high-speed sewing is obtained after oiling.

2. The flame retardant high temperature resistant sewing thread for high speed sewing according to claim 1, characterized in that, In the step one, the mass percentage of sodium hydroxide in the sodium hydroxide solution is 8%-10%, and the solvent is water; the mass ratio of the arnos fiber soaked in the sodium hydroxide solution is arnos fiber:sodium hydroxide solution=1:

80.

3. The flame resistant high temperature resistant sewing thread for high speed sewing according to claim 1, characterized in that, In the step two, the concentration of the trishydroxymethyl aminomethane in the trishydroxymethyl aminomethane aqueous solution is 0.13g / mL, and the mass percentage of the solute in the hydrochloric acid solution is 36%; the amount of the added dopamine hydrochloride to the solution is dopamine hydrochloride:solution=0.2g:100mL; the mass ratio of the added alkali treated fiber to the added dopamine hydrochloride is alkali treated fiber:dopamine hydrochloride=1g:0.2g.

4. The flame resistant high temperature resistant sewing thread for high speed sewing according to claim 1, wherein In the step three, the concentration of the Tween 80 in the mixed aqueous solution of Tween 80, ethylene glycol and isopropyl alcohol is 5-8g / L, the volume percentage of ethylene glycol is 10%-15%, the volume percentage of isopropyl alcohol is 8%-12%, and the solvent is water.

5. The flame resistant high temperature resistant sewing thread for high speed sewing according to claim 1, wherein The components of the silicone wax emulsion are dimethyl silicone oil 80-90 parts; paraffin wax 5-10 parts; palmitic acid 3-4 parts; Span-60 1-3 parts.