A high-strength breathable composite fabric and its preparation method

Abstract

The present invention discloses a high-strength breathable composite fabric and a preparation method thereof. The method comprises the following steps: using polyester fiber as an outer wrapping staple fiber and the nylon multifilament with surface treatment as a core yarn, spinning a composite yarn by a composite core-spun spinning process, weaving the fabric into a greige fabric, and then grafting hydrophilic monomers of hydrophilic sulfonic acid groups and modified isocyanatoethyl methacrylate by a post-treatment process to prepare a high-strength breathable composite fabric. Compared with the prior art, the high-strength breathable composite fabric prepared by the present invention has a strong moisture absorption and quick-drying function, optimizes the interfacial properties of the polyester fiber and the nylon multifilament, enhances the binding ability between the two, and achieves the technical purposes of enhancing the interfacial contact ability and improving the mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, and particularly to a high-strength breathable composite fabric and a preparation method thereof. Background Art

[0002] Composite fabrics are mainly made of chemical fibers. However, chemical fiber materials are hydrophobic fibers with poor skin-friendly properties, and also have problems such as poor moisture absorption and poor interfacial bonding performance, which severely limit their development and application. Combining polyester fibers with surface-treated polyamide multifilaments, the hydroxyl groups generated after alkali pretreatment of the prepared fabric are condensed with the hydroxyl groups of 3-mercaptopropyltrimethoxysilane to prepare a mercapto-modified fabric; through unilateral ultraviolet irradiation, hydrophilic groups are grafted on the surface of polyester fibers through mercapto groups, and the obtained high-strength breathable composite fabric has better moisture absorption, quick-drying, antistatic and breathable properties.

[0003] Patent CN 108468125 A discloses a high-strength and wear-resistant composite fabric. The composite fabric is woven from a mixed yarn of polyester fibers, polyamide fibers, acrylic fibers, spandex fibers and wool fibers, and the mixed yarn is three-dimensionally woven into a composite fabric, which has good comfort. Patent CN 108486712 A provides a preparation method of a high-elastic and sweat-proof composite fabric. The composite fabric is made of viscose fibers, polyester fibers, spandex fibers, polyamide and natural fibers, and has very excellent elasticity. As clothing, it has strong body-fitting performance, good warmth retention, prominent breathability, can prevent sweating, greatly improves the adaptability, and the preparation method has simple processes, mild reaction conditions and low cost. However, none of the above patents optimize the bonding ability between fibers, and poor bonding may occur in actual applications, resulting in a decrease in mechanical properties. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to construct a high-strength breathable composite fabric in a way with remarkable effects and simple processes.

[0005] To achieve the above object, the present invention provides a preparation method of a high-strength breathable composite fabric, comprising the following steps:

[0006] Step 1: Using polyester fibers as outer short fibers and polyamide multifilaments as core yarns, spinning composite yarns by a composite core-spun spinning process;

[0007] Step 2: Weaving the composite yarn spun in Step 1 into a fabric blank by a special organizational structure;

[0008] Step 3: Post-treating the fabric blank in Step 2 to obtain a high-strength breathable composite fabric.

[0009] Preferably, in step 1, the polyester fiber and the nylon multifilament are calculated by weight: the polyester fiber is 60 to 90 parts, and the nylon multifilament is 10 to 40 parts.

[0010] Preferably, in step 1, the polyester fiber and the nylon multifilament are calculated by weight: the polyester fiber is 80 parts and the nylon multifilament is 20 parts.

[0011] Polyester fiber and nylon multifilament have smooth surfaces and low friction coefficients. When the two are combined to prepare composite yarns, there is a technical problem that the bonding ability is poor, resulting in limited mechanical properties of the fabric. In order to optimize the interface performance of polyester fiber and nylon multifilament and enhance the bonding ability between the two, the inventors used acrylic acid to graft on nylon multifilament and then chelated it with ethylenediamine to increase the surface roughness of the core yarn, achieving the technical purpose of enhancing the interface contact ability and improving the mechanical properties.

[0012] Further preferably, the nylon multifilament is a surface-treated modified nylon multifilament, and the treatment method is as follows, in parts by weight:

[0013] M1. Wash 1-2 parts of nylon multifilament with acetone, dry it and soak it in 50-75 parts of water, then add 0.05-0.15 parts of dibenzoyl peroxide and 4-8 parts of acrylic acid, and react at 75-90°C for 6-12 hours; filter the reaction product to obtain a filter cake, wash it with water, and dry it to obtain a graft copolymer for later use;

[0014] M2. Add the graft copolymer to 400-600 parts of 8-12% (v / v) ethylenediamine aqueous solution, and mix and react at 30-45° C. for 3-9 hours; filter the reaction product to obtain a filter cake, wash with alcohol, and dry to obtain the modified nylon multifilament.

[0015] Preferably, the yarn output speed of the composite core-spun spinning process in step 1 is 5 to 15 m / min, the twist is 300 to 600 T / m, the filament swing frequency is 20 to 50 times / min, the swing center of the nylon multifilament at the rear end of the front roller is aligned with the center of the whisker, and the swing width is 1 to 4 mm greater than the whisker width.

[0016] Preferably, the yarn output speed of the composite core-spun spinning process in step 1 is 10 m / min, the twist is 450 T / m, the filament swing frequency is 30 times / min, the swing center of the nylon multifilament at the rear end of the front roller is aligned with the center of the whisker, and the swing width is greater than the whisker width by 2 mm.

[0017] Preferably, in step 1, the linear density of the composite yarn is 30-150 tex.

[0018] Preferably, the special weave structure in step 2 is one of plain weave, twill weave, satin weave and combined weave.

[0019] Preferably, in step 2, the warp density of the fabric greige is 100 - 400 threads per 10 cm, the weft density is 100 - 400 threads per 10 cm, and the areal density is 300 - 1000 g / m 2. .

[0020] Preferably, the post-treatment method in step 3 is as follows, and the parts are all by weight:

[0021] S1. Immerse 5 - 10 parts of the fabric greige in 30 - 100 parts of 200 g / L sodium hydroxide aqueous solution, stir for 10 - 40 min; then rinse the fabric with water until the pH value of the leachate on the fabric surface reaches 7, and dry at 50 - 90 °C to prepare a standby fabric;

[0022] S2. Add 4 - 10 parts of 3 wt% 3-mercaptopropyltrimethoxysilane to 70 - 100 parts of 85 wt% ethanol aqueous solution, adjust the pH of the solution to 3 - 6 with acetic acid, stir at room temperature for 10 - 50 min to prepare a 3-mercaptopropyltrimethoxysilane solution; then immerse 5 - 15 parts of the standby fabric from step S1 in the 3-mercaptopropyltrimethoxysilane solution, stir at room temperature for 5 - 20 min to obtain a grafted fabric; finally, thermally cure the grafted fabric at 100 - 140 °C for 3 - 10 min, and then dry, the drying temperature is 40 - 80 °C, and the drying time is 5 - 20 min to obtain a dry grafted fabric;

[0023] S3. Prepare a solution by mixing 0.1 - 2 parts of 0.3 wt% dibutyltin dilaurate, 1 - 5 parts of polyethylene glycol - 400 and 5 - 10 parts of isocyanatoethyl methacrylate, react the solution in a closed container, the reaction temperature is 60 - 100 °C, stir for 2 - 7 h; then add 1 - 5 parts of methyl ethyl ketone to prepare a mixed solution;

[0024] S4. Immerse 5 - 15 parts of the dry grafted fabric from step S2 in a finishing solution composed of 10 - 30 parts of 10 wt% potassium 3-sulfopropyl methacrylate, 5 - 10 parts of the mixed solution prepared in S3 and 1 - 4 parts of 1 wt% 2,2-dimethylolpropionic acid, then irradiate the dry grafted fabric with ultraviolet light at room temperature, irradiate one side of the fabric with ultraviolet light, the ultraviolet light source is 400 - 600 W, the irradiation distance is 5 - 15 cm, and the irradiation time is 0.5 - 2 h; then wash with 50 - 150 parts of water for 1 - 5 times, and then dry, the drying temperature is 40 - 80 °C, and the drying time is 5 - 30 min to finally obtain a high-strength breathable composite fabric.

[0025] Nylon: commonly known as nylon, is a general term for thermoplastic resins containing repeating amide groups - [NHCO] - on the main chain of the molecule. Among them, aliphatic groups are the most numerous and are the most widely used. It has good mechanical properties, heat resistance, wear resistance, chemical resistance, and a low friction coefficient. It has certain flame retardancy, light weight, excellent wrinkle resistance, good air permeability, good durability, dyeability and heat setting. It was invented by the famous American chemist Carothers and his research team.

[0026] Composite core-spun spinning process: In order to solve the problem of poor coherence and easy slippage between filaments and short fibers, a composite core-spun spinning process that guides the periodic transfer of filaments has been developed. The filaments are guided to move horizontally left and right by a guide wheel, and the filaments swing periodically left and right in the yarn triangle area. The dynamic transfer of the filaments produces periodic changes in the core wrapping of the yarn structure. The filaments dynamically fix the short fiber bundles together firmly, so that the filaments and short fibers are in full contact, and the cohesion between the fibers is enhanced. During the friction process, the short fibers are not easy to loosen and fall off, and the yarn structure is complete, giving the dynamic core-spun composite yarn good friction performance.

[0027] The water absorption process of textiles can be divided into chemical adsorption and physical adsorption. Hydrophilic groups play a leading role in chemical adsorption. Hydrophilic groups such as hydroxyl groups can react with water molecules to form chemical bonds, which have an adsorption effect on water molecules. It is difficult for water molecules to be separated by changes in general physical conditions. Physical adsorption refers to the absorption of water through the differential effect formed by the difference in hygroscopicity and the capillaries between fibers or inside fibers. Water molecules will not form chemical bonds with the fibers. There is also van der Waals force between the adsorbed water molecules. Given a certain pressure and temperature, water molecules can break through the binding effect of the van der Waals force and leave the material surface.

[0028] The differential effect is mainly responsible for the long-distance liquid water transportation, and the diffusion is more responsible for the short-distance liquid water transportation. Since the polyester staple fiber has good chemical adsorption properties after hydrophilic finishing, the water molecules first combine with the hydrophilic fibers on the outside of the fabric. Because the hygroscopicity inside and outside the fabric is different, there is a certain differential effect. Part of the water in the internal water-absorbing fiber is separated under the action of the differential effect and transferred to the outside in the form of free water through the ducts and grooves in the fiber. When the external water molecules come into contact with the air, the van der Waals force between the water molecules is not enough to offset the movement of the water molecules. The water molecules will break free from the bondage and evaporate into the air to maintain the dynamic balance of the fabric moisture.

[0029] The post-treatment of the composite fabric is carried out. The original polyester fiber has a smooth surface and the fibers are arranged closely, making it difficult for the finishing liquid to penetrate. However, after the polyester fabric is treated with sodium hydroxide, the hydrolysis of the ester bond is promoted. The polyester fiber produces hydroxyl groups and methyl groups through hydrolysis, the fiber diameter becomes thinner, the gap between the fibers increases, and many grooves are formed on the fiber surface, providing active sites for subsequent reactions. Then 3-mercaptopropyltrimethoxysilane is added. Under acidic conditions, the SiOCH3 group is hydrolyzed to obtain a group containing SiOH. The reason for the appearance of small particles at the grooves of the polyester fiber is that the exposed hydroxyl groups at the grooves react with the SiOH groups of the completely hydrolyzed 3-mercaptopropyltrimethoxysilane under heating conditions to form hydrogen bonds, grafting the mercapto group onto the surface of the polyester fiber. Moreover, in addition to interacting with the polyester fiber, the hydrolyzed 3-mercaptopropyltrimethoxysilane will gradually self-condense to form dimers, linear siloxane structures and even three-dimensional polysiloxane structures. Isocyanatoethyl methacrylate reacts with polyethylene glycol-400 under the catalysis of dibutyltin dilaurate to generate modified isocyanatoethyl methacrylate that can bind to the mercapto group. Potassium 3-sulfopropyl methacrylate and modified isocyanatoethyl methacrylate react with the mercapto groups on the surface of the polyester fiber under the action of ultraviolet light and 2,2-dimethylolpropionic acid, introducing hydrophilic monomers containing hydrophilic sulfonic acid groups, etc. Moreover, after the reaction occurs on the surface under ultraviolet irradiation, the fiber surface is relatively rough, and the larger roughness increases the adsorption on the fabric surface.

[0030] Due to the adoption of the above technical solutions, compared with the prior art, the preparation method of a high-strength breathable composite fabric of the present invention has the following advantages: 1) The composite core-spun spinning process is adopted to prepare the composite yarn. The filament and staple fibers transfer inside and outside to form yarns, improving the fiber utilization rate and enhancing the cohesion between the fibers. The prepared fabric has excellent wear resistance. 2) The single-sided post-treatment process is adopted to introduce hydrophilic groups on the fabric surface, expanding the contact area, improving the moisture absorption and quick-drying performance of the fabric, and enhancing the wearing comfort of the fabric. 3) In the single-sided post-treatment process, the hydrophilic groups are grafted chemically, endowing the fabric with good wash resistance, and greatly improving the antistatic property and pilling resistance of the fabric. 4) After acrylic acid is grafted onto the nylon multifilament and then chelated with ethylenediamine, the surface roughness of the core yarn is increased, the interfacial properties between the polyester fiber and the nylon multifilament are optimized, and the mechanical properties of the fabric are enhanced. Specific embodiments

[0031] Sources of the main raw materials in the examples:

[0032] Polyester fiber: Shandong Luxian Building Materials Technology Co., Ltd., density: 1.36 g / cm 3 , fiber length: 36 - 50 mm.

[0033] Nylon fiber: Kunshan Quanfulai Electronics Co., Ltd., fineness: 100D, number of holes: 10F.

[0034] Benzoyl peroxide: Shandong Duoju Chemical Co., Ltd., CAS No.: 94-36-0.

[0035] Acrylic acid: Shandong Qiaobang Chemical Co., Ltd., CAS No.: 79-10-7.

[0036] 3-Mercaptopropyltrimethoxysilane: Jiangsu Pulesi Biotechnology Co., Ltd., Appearance: Light yellow to yellow transparent liquid, Molecular weight: 196.3399, CAS No.: 4420-74-0.

[0037] Potassium 3-sulfopropyl methacrylate: Wuhan Huaxiang Kejie Biotechnology Co., Ltd., CAS No.: 31098-21-2.

[0038] Polyethylene glycol - 400: Jiangsu Haian Petrochemical Factory, Molecular weight: 360 - 440, CAS No.: 25322-68-3.

[0039] Isocyanatoethyl methacrylate: Hubei Jiufenglong Chemical Co., Ltd., CAS No.: 30674-80-7.

[0040] Example 1

[0041] A preparation method of a high-strength breathable composite fabric, comprising the following steps, and all parts are by weight:

[0042] Step 1: Take 80 parts of polyester fiber as the outer wrapping staple fiber and 20 parts of nylon multifilament as the core yarn, and adopt the composite core-spun spinning process. The yarn output speed is 10 m / min, the twist is 450 T / m. Align the swing center of the nylon multifilament with the center of the sliver at the rear end of the front roller, and the swing width is 2 mm larger than the width of the sliver. The swing frequency of the nylon multifilament is 30 times / min to spin a dynamic core-spun composite yarn, and the yarn linear density is 60 tex;

[0043] Step 2: Weave the dynamic core-spun composite yarn spun in Step 1 into a fabric greige with a 3×1 twill weave structure, where the warp density of the fabric greige is 300 ends / 10 cm, the weft density is 280 picks / 10 cm, and the areal density is 700 g / m 2 ;

[0044] Step 3: Post-treat the fabric greige in Step 2 to obtain a high-strength breathable composite fabric.

[0045] The post-treatment method in Step 3 is as follows, and all parts are by weight:

[0046] S1. Immerse 10 parts of the fabric blank obtained in Step 2 in 90 parts of a 200 g / L sodium hydroxide aqueous solution, stir the mixture using a magnetic stirrer for 30 minutes; then rinse the fabric blank with deionized water until the pH value of the leachate on the surface of the fabric blank reaches 7, and dry it in an oven at 80 °C for 30 minutes to prepare a spare fabric;

[0047] S2. Add 8 parts of 3 wt% 3-mercaptopropyltrimethoxysilane to 92 parts of an 85 wt% ethanol aqueous solution, adjust the pH of the solution to 5 using acetic acid, and stir the mixed solution using a magnetic stirrer at room temperature for 30 minutes to prepare a 3-mercaptopropyltrimethoxysilane solution; then immerse 10 parts of the spare fabric from Step S1 in the 3-mercaptopropyltrimethoxysilane solution, and stir the mixed solution using a magnetic stirrer at room temperature for 10 minutes to obtain a grafted fabric; finally, thermally cure the grafted fabric at 120 °C for 5 minutes; then dry it in an oven at a temperature of 60 °C for 10 minutes to obtain a dry grafted fabric;

[0048] S3. Prepare a solution by mixing 1 part of 0.3 wt% dibutyltin dilaurate, 3 parts of polyethylene glycol-400, and 6 parts of isocyanatoethyl methacrylate. Dibutyltin dilaurate is the reaction catalyst. Place the solution in a closed reactor for reaction at a reaction temperature of 80 °C, and stir it using a magnetic stirrer for 5 hours during the reaction; then add 3 parts of methyl ethyl ketone to prepare a mixed solution;

[0049] S4. Spread and immerse 10 parts of the dry grafted fabric in a finishing solution composed of 20 parts of 10 wt% potassium 3-sulfopropyl methacrylate, 7 parts of the mixed solution prepared in Step S3, and 2 parts of 1 wt% 2,2-dimethylolpropionic acid; then irradiate one side of the fabric with 365 nm ultraviolet light at room temperature. The ultraviolet light source is 500 W, the illumination distance is 10 cm, and the illumination time is 1 hour; then wash it 3 times with 100 parts of deionized water; then dry it using an oven at a drying temperature of 60 °C for 10 minutes to finally obtain a high-strength breathable composite fabric.

[0050] Example 2

[0051] A method for preparing a high-strength breathable composite fabric, comprising the following steps:

[0052] It is basically the same as Example 1, and the only difference is that:

[0053] The post-treatment method in Step 3 is as follows, and all parts are by weight:

[0054] S1. Immerse 10 parts of the fabric blank obtained in Step 2 in 90 parts of a 200 g / L sodium hydroxide aqueous solution, stir the mixture using a magnetic stirrer for 30 minutes; then rinse the fabric blank with deionized water until the pH value of the leachate on the surface of the fabric blank reaches 7, and dry it in an oven at 80 °C for 30 min to prepare a spare fabric;

[0055] S2. Add 8 parts of 3 wt% 3-mercaptopropyltrimethoxysilane to 92 parts of an 85 wt% ethanol aqueous solution, adjust the pH of the solution to 5 using acetic acid, and stir the mixed solution using a magnetic stirrer at room temperature for 30 min to prepare a 3-mercaptopropyltrimethoxysilane solution; then immerse 10 parts of the spare fabric from Step S1 in the 3-mercaptopropyltrimethoxysilane solution, stir the mixed solution using a magnetic stirrer at room temperature for 10 min to obtain a grafted fabric; finally, thermally cure the grafted fabric at 120 °C for 5 minutes; then dry it in an oven at 60 °C for 10 min to obtain a dried grafted fabric;

[0056] S3. Prepare a solution by mixing 1 part of 0.3 wt% dibutyltin dilaurate, 3 parts of polyethylene glycol-400, and 6 parts of deionized water, place the solution in a closed reactor for reaction at a reaction temperature of 80 °C, and stir it using a magnetic stirrer for 5 h during the reaction; then add 3 parts of methyl ethyl ketone to prepare a mixed solution;

[0057] S4. Lay 10 parts of the dried grafted fabric flat and immerse it in a finishing solution composed of 20 parts of 10 wt% potassium 3-sulfopropyl methacrylate, 7 parts of the mixed solution prepared in Step S3, and 2 parts of 1 wt% 2,2-dimethylolpropionic acid; then, at room temperature, irradiate one side of the fabric with ultraviolet light at 365 nm, with a 500 W ultraviolet light source and a light distance of 10 cm for 1 h; then wash it 3 times with 100 parts of deionized water; then dry it in an oven at 60 °C for 10 min to finally obtain a high-strength breathable composite fabric.

[0058] Example 3

[0059] A method for preparing a high-strength breathable composite fabric, comprising the following steps:

[0060] It is basically the same as Example 1, and the only difference is that:

[0061] The post-treatment method in Step 3 is as follows, and all parts are by weight:

[0062] S1. Immerse 10 parts of the fabric blank obtained in Step 2 in 90 parts of a 200 g / L sodium hydroxide aqueous solution, stir the mixture using a magnetic stirrer for 30 minutes; then rinse the fabric blank with deionized water until the pH value of the leachate on the surface of the fabric blank reaches 7, and dry it in an oven at 80 °C for 30 minutes to prepare a spare fabric;

[0063] S2. Add 8 parts of 3 wt% 3-mercaptopropyltrimethoxysilane to 92 parts of an 85 wt% ethanol aqueous solution, adjust the pH of the solution to 5 using acetic acid, and stir the mixed solution using a magnetic stirrer at room temperature for 30 minutes to prepare a 3-mercaptopropyltrimethoxysilane solution; then immerse 10 parts of the spare fabric from Step S1 in the 3-mercaptopropyltrimethoxysilane solution, stir the mixed solution using a magnetic stirrer at room temperature for 10 minutes to obtain a grafted fabric; finally, thermally cure the grafted fabric at 120 °C for 5 minutes; then dry it in an oven at 60 °C for 10 minutes to obtain a dried grafted fabric;

[0064] S3. Prepare a solution by mixing 1 part of 0.3 wt% dibutyltin dilaurate, 3 parts of polyethylene glycol-400, and 6 parts of isocyanatoethyl methacrylate. Dibutyltin dilaurate is used as a reaction catalyst. Place the solution in a closed reactor for reaction at a reaction temperature of 80 °C, and stir it using a magnetic stirrer for 5 hours during the reaction; then add 3 parts of methyl ethyl ketone to prepare a mixed solution;

[0065] S4. Spread and immerse 10 parts of the dried grafted fabric in a finishing solution prepared from 20 parts of deionized water, 7 parts of the mixed solution prepared in Step S3, and 2 parts of 1 wt% 2,2-dimethylolpropionic acid; then irradiate one side of the fabric with ultraviolet light at 365 nm at room temperature, with a 500 W ultraviolet light source, a light distance of 10 cm, and a light irradiation time of 1 hour; then wash it 3 times with 100 parts of deionized water; then dry it in an oven at a drying temperature of 60 °C for 10 minutes to finally obtain a high-strength breathable composite fabric.

[0066] Example 4

[0067] A method for preparing a high-strength breathable composite fabric, comprising the following steps, where the parts are all by weight:

[0068] Step 1. Use 80 parts of polyester fiber as the outer short fiber and 20 parts of polyamide multifilament as the core yarn, and adopt a composite core-spun spinning process, where the yarn output speed is 10 m / min, the twist is 450 T / m, align the center of the polyamide multifilament swing with the center of the sliver at the rear end of the front roller, the swing width is 2 mm greater than the width of the sliver, and the swing frequency of the polyamide multifilament is 30 times / min to spin a dynamic core-spun composite yarn with a yarn linear density of 60 tex;

[0069] Step 2: The dynamic core-spun composite yarn spun in step 1 is woven into a fabric with a 3×1 twill structure, wherein the fabric has a warp density of 300 strands / 10cm, a weft density of 280 strands / 10cm, and a surface density of 700g / m 2 ;

[0070] Step 3: post-process the fabric grey cloth of step 2 to obtain a high-strength breathable composite fabric.

[0071] The nylon multifilament is a surface-treated modified nylon multifilament, and the treatment method is as follows, in parts by weight:

[0072] M1. Wash 1 part of nylon multifilament with acetone, dry it and soak it in 50 parts of water, then add 0.05 parts of dibenzoyl peroxide and 6 parts of acrylic acid, and react at 80°C for 8 hours; filter the reaction product to obtain a filter cake, wash it with water, and dry it to obtain a graft copolymer for later use;

[0073] M2. Add the graft copolymer to 400 parts of 8% (v / v) ethylenediamine aqueous solution, and mix and react at 40° C. for 6 hours; filter the reaction product to obtain a filter cake, wash with ethanol, and dry to obtain the modified nylon multifilament.

[0074] The post-treatment method in step 3 is as follows, and the parts are all parts by weight:

[0075] S1, soaking 10 parts of the fabric grey cloth obtained in step 2 in 90 parts of 200g / L sodium hydroxide aqueous solution, stirring the mixture with a magnetic stirrer for 30 minutes; then rinsing the fabric grey cloth with deionized water until the pH value of the eluted liquid on the surface of the fabric grey cloth reaches 7, and drying it in an oven at 80°C for 30 minutes to prepare a standby fabric;

[0076] S2, adding 8 parts of 3wt% 3-mercaptopropyltrimethoxysilane to 92 parts of 85wt% ethanol aqueous solution, adjusting the solution pH to 5 with acetic acid, stirring the mixed solution with a magnetic stirrer at room temperature for 30 minutes, and preparing a 3-mercaptopropyltrimethoxysilane solution; then soaking 10 parts of the spare fabrics in step S1 in the 3-mercaptopropyltrimethoxysilane solution, stirring the mixed solution with a magnetic stirrer at room temperature for 10 minutes, and obtaining a grafted fabric; finally, thermally curing the grafted fabric at 120°C for 5 minutes; then drying in an oven at 60°C for 10 minutes to obtain a dry grafted fabric;

[0077] S3. Prepare a solution by mixing 1 part of dibutyltin dilaurate at 0.3 wt%, 3 parts of polyethylene glycol - 400, and 6 parts of isocyanatoethyl methacrylate. Dibutyltin dilaurate serves as the reaction catalyst. Place the solution in a closed reactor for reaction at a temperature of 80°C, and stir the solution with a magnetic stirrer for 5 h during the reaction process. Then, add 3 parts of methyl ethyl ketone to prepare a mixed solution.

[0078] S4. Lay 10 parts of the dry grafted fabric flat and soak it in a finishing solution composed of 20 parts of 10 wt% potassium 3 - sulfopropyl methacrylate, 7 parts of the mixed solution prepared in step S3, and 2 parts of 1 wt% 2,2 - dimethylolpropionic acid. Then, at room temperature, irradiate one side of the fabric with ultraviolet light at 365 nm. The ultraviolet light source is 500 W, the illumination distance is 10 cm, and the illumination time is 1 h. Next, wash it 3 times with 100 parts of deionized water. Then, dry it in an oven at a drying temperature of 60°C and a drying time of 10 min to finally obtain a high - strength breathable composite fabric.

[0079] Comparative Example 1

[0080] A method for preparing a high - strength breathable composite fabric, comprising the following steps:

[0081] It is basically the same as Example 1, and the only difference is that:

[0082] The post - treatment method in step 3 is as follows, and all parts are by weight:

[0083] S1. Soak 10 parts of the fabric blank obtained in step 2 in 90 parts of 200 g / L sodium hydroxide aqueous solution, stir the mixture with a magnetic stirrer for 30 minutes. Then, rinse the fabric blank with deionized water until the pH value of the leachate on the fabric blank surface reaches 7, and dry it in an oven at 80°C for 30 min to prepare a standby fabric.

[0084] S2. Add 8 parts of 3 wt% 3 - mercaptopropyltrimethoxysilane to 92 parts of 85 wt% ethanol aqueous solution, adjust the pH of the solution to 5 with acetic acid, and stir the mixed solution with a magnetic stirrer at room temperature for 30 min to prepare a 3 - mercaptopropyltrimethoxysilane solution. Then, soak 10 parts of the standby fabric from step S1 in the 3 - mercaptopropyltrimethoxysilane solution, stir the mixed solution with a magnetic stirrer at room temperature for 10 min to obtain a grafted fabric. Finally, thermally cure the grafted fabric at 120°C for 5 minutes. Then, dry it in an oven at an oven temperature of 60°C and a drying time of 10 min to obtain a dry grafted fabric.

[0085] S3. Prepare a solution by mixing 1 part of dibutyltin dilaurate at 0.3 wt%, 3 parts of polyethylene glycol - 400, and 6 parts of deionized water. Dibutyltin dilaurate serves as the reaction catalyst. Place the solution in a closed reactor for reaction at a temperature of 80°C, and stir it with a magnetic stirrer for 5 h during the reaction process. Then, add 3 parts of methyl ethyl ketone to prepare a mixed solution.

[0086] S4. Lay 10 parts of dry grafted fabric flat and soak it in a finishing solution prepared from 20 parts of deionized water, 7 parts of the mixed solution prepared in step S3, and 2 parts of 2,2 - dimethylolpropionic acid at 1 wt%. Then, at room temperature, irradiate one side of the fabric with ultraviolet light at 365 nm. The ultraviolet light source is 500 W, the illumination distance is 10 cm, and the illumination time is 1 h. Next, wash it 3 times with 100 parts of deionized water. Then, dry it in an oven at a drying temperature of 60°C for 10 min to finally obtain a high - strength breathable composite fabric.

[0087] Comparative Example 2

[0088] A method for preparing a high - strength breathable composite fabric, comprising the following steps:

[0089] It is basically the same as Example 1, and the only difference is that:

[0090] Step 1. Use 80 parts of polyester fiber as the outer - wrapped staple fiber and 20 parts of nylon multifilament as the core yarn, and adopt the composite core - spun spinning process. The yarn output speed is 10 m / min, the twist is 450 T / m. Align the center of the nylon multifilament swing with the center of the sliver at the rear end of the front roller, and the swing width is 2 mm greater than the sliver width. The swing frequency of the nylon multifilament is 30 times / min to spin a dynamic core - spun composite yarn with a yarn linear density of 60 tex.

[0091] Step 2. Weave the dynamic core - spun composite yarn spun in step 1 into a fabric greige using a 3×1 twill weave structure, where the warp density of the fabric greige is 300 picks / 10 cm, the weft density is 280 picks / 10 cm, and the areal density is 700 g / m 2 .

[0092] Test Example 1

[0093] The test for the moisture absorption and quick - drying performance of the fabric is carried out in accordance with the national standard GB / T21655.1 - 2008 "Evaluation of moisture absorption and quick - drying properties of textiles - Part 1: Single - item combined test method". Among them, the two indicators of wicking height and moisture permeability can best reflect the effect of the moisture absorption and quick - drying performance of the fabric.

[0094] Refer to the washing standard in GB / T 3921-2008 "Textiles - Tests for colour fastness - Colour fastness to soaping". Use cotton fiber fabric as the lining fabric to conduct the soaping experiment at 50°C. Wash with a SW-12 colour fastness to washing tester. After washing once, dry the fabric and conduct the moisture absorption and quick drying performance test in the same method.

[0095] (1) Wicking height test

[0096] FZ T01071-2008 "Textiles - Test method for capillary effect" details the test method for the wicking height of fabrics. Test according to this method, and the test results are shown in Table 1:

[0097] Table 1: Test results of fabric wicking height

[0098]

[0099] (2) Moisture permeability test

[0100] The standard and test method for moisture permeability are referred to GB / T 12704.1-2009 "Textiles - Test method for fabric moisture permeability - Part 1: Moisture absorption method" for testing, and the test results are shown in Table 2

[0101] Table 2: Test results of moisture permeability

[0102]

[0103] It can be found by comparing the comparative examples and the examples that the post-treatment of the fabric significantly improves the moisture absorption and quick drying performance. The possible reason is that hydrophilic sulfonate and modified isocyanatoethyl methacrylate are grafted onto the fabric surface through chemical reactions under ultraviolet irradiation, while the probability of grafting on the other side of the fabric is very small, resulting in a large moisture absorption gradient on both sides of the fabric, which is conducive to the transmission of moisture; moreover, the fiber surface becomes rougher after the reaction on the irradiated surface, and the larger roughness increases the surface area of the fabric and enhances the moisture adsorption performance. Therefore, the fabric has excellent moisture absorption and quick drying performance. And after washing, the moisture absorption and quick drying performance of the fabric remains almost unchanged because the hydrophilic groups on the fabric surface are chemically grafted and connected to the fabric surface through chemical bonds, and the chemical bonds are not easily broken during physical washing. Therefore, the high-strength breathable composite fabric has good water washing resistance.

[0104] Test Example 2

[0105] Abrasion resistance test:

[0106] Refer to GB / T 21196.1-2007 "Textiles - Determination of fabric abrasion resistance using the Martindale method - Part 1: Martindale abrasion tester", use the YG401C-9 fabric flat abrasion tester to conduct abrasion resistance tests, and refer to GB / T 21196.2-2007 "Textiles - Determination of fabric abrasion resistance using the Martindale method - Part 2: Determination of specimen damage" to judge the fabric damage situation.

[0107] The abrasion resistance of the test samples is greater than 40,000 revolutions, indicating that the fabrics prepared by the composite core-spun spinning process all have good abrasion resistance characteristics.

[0108] Test Example 3

[0109] Pilling resistance performance test:

[0110] During the daily use of fabrics, they are constantly subjected to friction. At the parts prone to friction, the fiber ends on the fabric surface become loose due to frictional sliding, expose on the fabric surface, and present many annoying fluff, which is called "pilling"; if these fluff cannot fall off in time during continued wearing and continue to be subjected to friction and curl and entangle with each other, they are kneaded into many spherical particles, which is called "pilling".

[0111] Refer to GB / T 4802.2-2008 "Textiles - Determination of fabric pilling resistance - Part 2: Modified Martindale method", use an incandescent fluorescent lamp tube in a rating box to conduct pilling resistance grading on the friction-treated fabric, and the evaluation results are shown in Table 3.

[0112] Table 3: Pilling resistance performance of the fabric

[0113]

[0114]

[0115] It can be seen from the pilling resistance performance table of the fabric that the fabric samples grafted with hydrophilic sulfonate and modified isocyanatoethyl methacrylate have good pilling resistance performance. The possible reasons are that the fabric has excellent moisture absorption and quick-drying performance, has more hydrophilic groups, resulting in a higher moisture regain rate of the fabric, a greater proportion of moisture contained in the fabric, is not easy to generate static electricity, and the hairiness is not easy to entangle and knot due to static electricity during the friction process. Another part of the reason may be that there are more treatment processes in Example 1, and the chemical treatment process dissolves and softens some of the exposed fine hairiness, making the amount of exposed fibers on the fabric surface less and smoother, and the fibers are not easy to be pulled out and entangled during the friction process. To sum up, the fabric has more excellent moisture absorption and quick-drying performance.

[0116] Test Example 4

[0117] Tear strength test:

[0118] Refer to GB / T 3917.2-2009 "Textiles - Tear properties of fabrics - Part 2: Determination of tear force of trousers-shaped specimens (single tear)", the gauge length is 100 mm, and the test tensile speed is 100 mm / min; the test specimen is a rectangular strip of 200 mm×50 mm, and a 100-mm-long slit parallel to the length direction is cut in the middle of the width direction of each specimen; 5 specimens are tested in each group, and the result is the arithmetic mean. The test results are shown in Table 4.

[0119] Table 4: Tear strength test results

[0120] Experimental plan Tear strength (N) Example 1 46.6 Example 4 53.9

[0121] It can be seen from the tear strength test result table of the fabric that the tear strength of Example 4 is better than that of Example 1. The possible reason is that after acrylic acid is grafted onto the polyamide multifilament and then chelated with ethylenediamine, the surface roughness of the core yarn is increased, the interfacial properties of the polyester fiber and the polyamide multifilament are optimized, the bonding ability between the two is enhanced, and the tear strength is improved.

[0122] The specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A method for preparing a high-strength breathable composite fabric, characterized in that, Including: Step 1: Using polyester fiber as the outer short fiber and polyamide multifilament as the core yarn, a composite yarn is spun by a composite core-spun spinning process; Step 2: Weaving the composite yarn into a fabric greige; Step 3: Post-treating the fabric greige; The post-treatment method is as follows, and the parts are all by weight: S1: Immerse 5 - 10 parts of the fabric greige in 30 - 100 parts of 200g / L sodium hydroxide aqueous solution, stir for 10 - 40min; rinse the fabric with water until the pH value of the leachate on the fabric surface reaches 7, and dry at 50 - 90°C to prepare a standby fabric; S2: Add 4 - 10 parts of 3wt% 3-mercaptopropyltrimethoxysilane to 70 - 100 parts of 85wt% ethanol aqueous solution, adjust the pH of the solution to 3 - 6 with acetic acid, stir at room temperature for 10 - 50min to prepare a 3-mercaptopropyltrimethoxysilane solution; Immerse 5 - 15 parts of the standby fabric of S1 in the 3-mercaptopropyltrimethoxysilane solution, stir at room temperature for 5 - 20min to obtain a grafted fabric; Heat-cure the grafted fabric at 100 - 140°C for 3 - 10min, and dry, the drying temperature is 40 - 80°C, and the drying time is 5 - 20min to obtain a dry grafted fabric; S3: Prepare a solution by mixing 0.1 - 2 parts of 0.3wt% dibutyltin dilaurate, 1 - 5 parts of polyethylene glycol-400 and 5 - 10 parts of isocyanatoethyl methacrylate. The solution reacts in a closed container, the reaction temperature is 60 - 100°C, and stir for 2 - 7h; Add 1 - 5 parts of methyl ethyl ketone to prepare a mixed solution; S4: Immerse 5 - 15 parts of the dry grafted fabric in S2 in a finishing solution prepared from 10 - 30 parts of 10wt% potassium 3-sulfopropyl methacrylate, 5 - 10 parts of the mixed solution prepared in S3 and 1 - 4 parts of 1wt% 2,2-dimethylolpropionic acid. Irradiate the dry grafted fabric with ultraviolet light at room temperature. The ultraviolet light irradiates one side of the fabric. The power of the ultraviolet light source is 400 - 600W, the illumination distance is 5 - 15cm, and the illumination time is 0.5 - 2h; Wash with 50 - 150 parts of water for 1 - 5 times and dry. The drying temperature is 40 - 80°C, and the drying time is 5 - 30min to obtain a high-strength breathable composite fabric.

2. The method for preparing a high-strength breathable composite fabric according to claim 1, characterized in that: In Step 1, calculated by weight ratio, the polyester fiber is 60 - 90 parts, and the polyamide multifilament is 10 - 40 parts.

3. The method for preparing a high-strength breathable composite fabric according to claim 1, characterized in that: In Step 1, calculated by weight ratio, the polyester fiber is 80 parts, and the polyamide multifilament is 20 parts.

4. The method for preparing a high-strength breathable composite fabric according to claim 1, characterized in that: The polyamide multifilament is a modified polyamide multifilament after surface treatment. Its treatment method is as follows, calculated by weight: M1: Wash 1 - 2 parts of the polyamide multifilament with acetone, dry it, and then immerse it in 50 - 75 parts of water. Subsequently, add 0.05 - 0.15 parts of benzoyl peroxide and 4 - 8 parts of acrylic acid, and react at 75 - 90°C for 6 - 12h; Filter the reaction product to obtain a filter cake, wash it with water and dry it to obtain a graft copolymer for standby; M2. Add the graft copolymer to 400 - 600 parts of an aqueous ethylenediamine solution with a volume ratio of 8 - 12% (v / v), and carry out a mixing reaction at 30 - 45 °C for 3 - 9 h; filter the reaction product to obtain a filter cake, wash it with alcohol and dry it to obtain the modified polyamide multifilament.

5. The method for preparing a high-strength breathable composite fabric according to claim 1, characterized in that: In the composite core-spun spinning process in step 1, the yarn output speed is 5 - 15 m / min, the twist is 300 - 600 T / m, the long filament swing frequency is 20 - 50 times / min. At the rear end of the front roller, the swing center of the polyamide multifilament is aligned with the center of the sliver, and the swing width is 1 - 4 mm larger than the width of the sliver.

6. The method for preparing a high-strength breathable composite fabric according to claim 5, characterized in that: In the composite core-spun spinning process in step 1, the yarn output speed is 10 m / min, the twist is 450 T / m, the long filament swing frequency is 30 times / min. At the rear end of the front roller, the swing center of the polyamide multifilament is aligned with the center of the sliver, and the swing width is 2 mm larger than the width of the sliver.

7. The method for preparing a high-strength breathable composite fabric according to claim 1, characterized in that: In step 1, the linear density of the composite yarn is 30 - 150 tex.

8. The method for preparing a high-strength breathable composite fabric according to claim 1, characterized in that: In step 2, the fabric structure is one of plain weave, twill weave, satin weave, and combined weave.

9. The method for preparing a high-strength breathable composite fabric according to claim 1, characterized in that: In the step 2, the warp density of the fabric greige is 100 - 400 threads per 10 cm, the weft density is 100 - 400 threads per 10 cm, and the areal density is 300 - 1000 g / m 2 .

10. A high-strength breathable composite fabric, characterized in that: It is prepared by using the preparation method of a high-strength breathable composite fabric according to any one of claims 1 - 9.

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