A lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure, its preparation method and application

Abstract

The present invention relates to the technical field of laminated materials, and discloses a lightweight, sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure, its preparation method and application. The preparation method of the lightweight, sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure comprises the following steps: blending functionalized polyester fibers and polypropylene fibers into a first skin layer yarn; subjecting the first skin layer yarn to laser drilling to form a microporous structure to obtain a pretreated first skin layer yarn; blending functionalized cotton fibers, ultra-fine polyethylene fibers and temperature-controlled fibers into a second core layer yarn; and weaving the pretreated first skin layer yarn and the second core layer yarn into a lightweight, sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure by using a double-layer plain weaving process. The lightweight, sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure of the present invention not only has excellent moisture absorption, sweat discharge and quick-drying performance, long-lasting antibacterial performance and ultraviolet resistance, but also has the lightweight characteristic, and can be used in the fields of sportswear, outdoor equipment and military protection, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of layered materials, and particularly to a lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure, a preparation method thereof, and an application thereof. Background Art

[0002] With the continuous development of life, people's requirements for the comfort of textiles are getting higher and higher. Especially in the context of the popularity of sports across the country, the importance of functional clothing is becoming increasingly prominent. A moisture-absorbing and quick-drying functional garment refers to a garment that can quickly absorb the sweat on the surface of the human skin in a hot and humid environment and transfer it to the outer surface of the fabric for evaporation, keeping the skin dry and comfortable.

[0003] For example, Chinese Patent Application CN107756977A discloses a moisture-absorbing and sweat-venting fabric and its process, characterized in that: the fabric layers are connected by spinning threads, and each fabric layer is woven and blended by warp threads and weft threads. The warp threads are viscose fibers, and a plurality of micropores are provided on the fabric layer, and the surface of the fabric layer is coated with a moisture-absorbing and sweat-venting film. The moisture-absorbing and sweat-venting fabric and its process open micropores in the fabric layer, and sweat is quickly discharged through the micropores and then absorbed by the moisture-absorbing and sweat-venting film, so as to achieve the function of moisture absorption and sweat discharge. However, the antibacterial performance and ultraviolet resistance of the moisture-absorbing and sweat-venting fabric need to be improved. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a preparation method of a lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure, including the following steps:

[0005] Step 1: Modify polyester fibers with glycidyl methacrylate to obtain surface-modified polyester fibers; impregnate the surface-modified polyester fibers in a multifunctional polyurethane emulsion to obtain functionalized polyester fibers; blend the functionalized polyester fibers and polypropylene fibers into a first skin layer yarn; the first skin layer yarn is laser-punched to form a microporous structure to obtain a pretreated first skin layer yarn;

[0006] Step 2: Prepare a polyurethane phase change material; the polyurethane phase change material is melt-spun to obtain temperature-controlled fibers; blend functionalized cotton fibers, ultra-fine polyethylene fibers, and temperature-controlled fibers into a second core layer yarn; the preparation method of the functionalized cotton fibers includes the following steps: Step B1: Modify cotton fibers with chitosan using citric acid as a crosslinking agent to obtain surface-modified cotton fibers; Step B2: Graft α-lipoic acid onto the surface-modified cotton fibers to obtain modified cotton fibers; Step B3: Encapsulate and deposit nano-silver on the modified cotton fibers to obtain functionalized cotton fibers;

[0007] Step 3: Weave the pretreated first skin layer yarn and the second core layer yarn into a lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure by a double-layer plain weaving process.

[0008] Preferably, in the first step, the fineness of the first cortical yarn is 70D; the mass ratio of the functionalized polyester fiber to the polypropylene fiber is (6 - 8):1; the diameter of the micropores on the pretreated first cortical yarn is 0.5 - 2 mm, and the gap between adjacent micropores is 4 - 6 times the pore diameter of the micropores.

[0009] Further, in the first step, the preparation method of the functionalized polyester fiber: Add glycidyl methacrylate and benzoin ethyl ether into acetone, stir and dissolve to obtain a monomer solution, and the concentration of glycidyl methacrylate in the monomer solution is 0.6 - 1.8 mol / L, and the concentration of benzoin ethyl ether is 0.05 - 0.15 mol / L; Immerse the polyester fiber in the above monomer solution for soaking treatment, and then carry out ultraviolet grafting reaction, washing, and drying to obtain surface-modified polyester fiber; among them, the conditions of the soaking treatment: the bath ratio is 1:(15 - 20), and the soaking time is 2 - 3 h; the conditions of the ultraviolet grafting reaction: irradiate under a high-pressure mercury lamp of 400 - 600 W, and the ultraviolet grafting reaction time is 10 - 20 min; Immerse the surface-modified polyester fiber in a multifunctional polyurethane emulsion, take it out after impregnation treatment, wash, and dry to obtain the functionalized polyester fiber; among them, the conditions of the impregnation treatment: the bath ratio is 1:(40 - 60), the impregnation temperature is 75 - 85 °C, and the impregnation time is 20 - 28 h; In the above process, the polyester fiber is surface-modified by glycidyl methacrylate, and epoxy groups are introduced on the surface of the polyester fiber; after the surface-modified polyester fiber is immersed in the multifunctional polyurethane emulsion, the epoxy groups on the surface of the surface-modified polyester fiber react with the amino groups in the multifunctional polyurethane emulsion, and the multifunctional polyurethane is bonded to the surface of the polyester fiber in the form of covalent bonds.

[0010] Further, in the first step, the preparation method of the multifunctional polyurethane emulsion includes the following steps:

[0011] Step A1: Dry the nano-zinc oxide at 80 - 120 °C for 20 - 28 h to obtain pretreated nano-zinc oxide; Take the pretreated nano-zinc oxide, distilled water, and ethanol and mix them, and ultrasonically disperse for 60 - 100 min to obtain a nano-zinc oxide dispersion; among them, the mass ratio of the pretreated nano-zinc oxide, distilled water, and ethanol is (3 - 6):(100 - 200):(40 - 80); Mix the silane coupling agent KH-550, distilled water, and ethanol in a mass ratio of (0.9 - 1.8):(50 - 100):(40 - 80), hydrolyze for 20 - 40 min, then add acetic acid to adjust the pH to 5 - 6, then add the above nano-zinc oxide dispersion, and stir at 70 - 80 °C for 2 - 4 h. After the reaction is completed, cool to room temperature, wash, and dry to obtain modified nano-zinc oxide;

[0012] Step A2: In a nitrogen atmosphere, perfluorooctanoyl chloride is added to tetrahydrofuran, and then a 2-hydroxy-1,3-propanediamine / methanol solution with a concentration of 0.1 g / mL is added. The reaction is carried out at room temperature for 12 - 16 h, and then an aqueous sodium bicarbonate solution with a mass fraction of 7.5% is added. Filtration is carried out under suction and drying is performed to obtain an intermediate product. Among them, the dosage ratio of perfluorooctanoyl chloride, tetrahydrofuran, 2-hydroxy-1,3-propanediamine / methanol solution, and aqueous sodium bicarbonate solution is (2 - 4) g : (10 - 25) mL : (5 - 10) mL : (5.2 - 10.4) mL;

[0013] Step A3: Vacuum dry polybutylene glycol at 70 - 80 °C for 20 - 30 h. In a nitrogen atmosphere, mix polybutylene glycol and isophorone diisocyanate, stir at 78 - 82 °C for 1.5 - 2.5 h, then add 2,2 - dimethylolpropionic acid and dibutyltin dilaurate, react at 74 - 76 °C for 0.8 - 1.2 h. Subsequently, cool down to 68 - 72 °C, add 1,4 - butanediol and react for 0.8 - 1.2 h, then add the intermediate product and react for 1.5 - 2.5 h, and then add modified nano - zinc oxide and react for 1.5 - 2.5 h. Acetone is added during the reaction process to reduce the viscosity. Subsequently, transfer the reaction mixture to a water bath at 43 - 48 °C, add triethylamine to neutralize the reaction for 0.4 - 0.6 h. After the reaction is completed, cool to 30 - 32 °C, add ethylenediamine and deionized water, shear - emulsify at a speed of 2000 - 4000 r / min for 20 - 40 min, and perform rotary evaporation to obtain a multifunctional polyurethane emulsion; wherein, the mass ratio of polybutylene glycol, isophorone diisocyanate, 2,2 - dimethylolpropionic acid, dibutyltin dilaurate, 1,4 - butanediol, intermediate product, modified nano - zinc oxide, acetone, triethylamine, ethylenediamine, and deionized water is (3.5 - 7.5):(2 - 5.5):(0.4 - 0.8):(0.001 - 0.005):(0.6 - 1):(0.3 - 0.5):(0.4 - 0.7):(2 - 10):(0.3 - 0.6):(0.3 - 0.5):(20 - 30); in the above process, the acyl chloride of perfluorooctanoyl chloride reacts with the amino group of 2 - hydroxy - 1,3 - propanediamine to generate an intermediate product containing hydroxyl, amino, and fluorinated long chains; nano - zinc oxide is modified by silane coupling agent KH - 550, introducing a large number of amino groups on the surface of nano - zinc oxide. Nano - zinc oxide itself has excellent ultraviolet - resistant and antibacterial properties. After surface modification, a large number of amino groups and silicon chain segments are introduced on the surface of nano - zinc oxide; the intermediate product and modified nano - zinc oxide are introduced into the polyurethane chain segment through reaction. The addition of nano - zinc oxide endows the multifunctional polyurethane emulsion with excellent ultraviolet - resistant and antibacterial properties. The silicon chain segments and fluorinated long chains enable the multifunctional polyurethane emulsion to reduce the surface tension, thereby improving the hydrophobic property of the multifunctional polyurethane emulsion. At the same time, there are more voids on the surface of nano - zinc oxide, enabling water molecules to form a large - angle contact on its surface, reducing the adhesion of water molecules on its surface, thereby achieving a good hydrophobic effect; in addition, the silicon - oxygen bonds introduced by silane coupling agent KH - 550 make the fabric treated with the multifunctional polyurethane emulsion have good softness; further, a large number of amino groups on the surface of the modified nano - zinc oxide in the multifunctional polyurethane can react with the epoxy groups on the surface of the surface - modified polyester fiber, improving the performance of the functionalized polyester fiber.

[0014] Preferably, in the second step, the preparation method of the temperature-controlled fiber is as follows: dissolve polyethylene glycol in toluene, then add toluene-2,4-diisocyanate and dibutyltin dilaurate, and stir and react at 38-42 °C for 7.5-8.5 h. Then add N-phenyldiethanolamine and dibutyltin dilaurate, and continue to stir and react at 78-82 °C for 7.5-8.5 h. Finally, add toluene-2,4-diisocyanate and continue to react for 3.5-4.5 h. Vacuum dry the obtained reaction product at 78-82 °C for 20-30 h to obtain a polyurethane phase change material; wherein, the mass ratio of polyethylene glycol, toluene, toluene-2,4-diisocyanate, dibutyltin dilaurate, and N-phenyldiethanolamine is (15-30):(300-500):(0.2-0.6):(0.001-0.005):(0.3-0.6); the polyurethane phase change material is melt-spun to obtain temperature-controlled fibers, wherein the melt-spinning conditions are: the melting temperature is 120-125 °C, the spinneret diameter is 0.5 mm, and the spinneret draw ratio is 5-6; in the above process, polyethylene glycol is used as the phase change material, and a polyurethane phase change material is formed through reaction, and then temperature-controlled fibers with bidirectional temperature regulation performance are formed through melt-spinning.

[0015] Further, in the second step, the preparation method of the functionalized cotton fiber is as follows:

[0016] Step B1: Add cotton fibers to an aqueous mixed solution containing citric acid and sodium hypophosphite at 75-85 °C, react for 1-1.5 h, then add chitosan oligosaccharide, and continue to react for 0.8-1.2 h. Then take out the cotton fibers, completely dry them at 100-105 °C and then thermally polymerize them at 145-155 °C for 2-4 min, wash and dry to obtain surface-modified cotton fibers; wherein, the mass ratio of cotton fibers, citric acid, sodium hypophosphite, and chitosan oligosaccharide is 1:4:2:(1.5-2.5);

[0017] Step B2: Add α-lipoic acid, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and N-hydroxysuccinimide to an ethanol aqueous solution with a volume fraction of 50%, and mix and stir at room temperature for 2-4 h to obtain a treatment solution; wherein, the dosage ratio of α-lipoic acid, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide, and ethanol aqueous solution is (2-4) g:(1.9-3.8) g:(0.6-1.2) g:(80-100) mL; add the surface-modified cotton fibers to the above treatment solution, control the bath ratio to be 1:(15-25), immerse and treat at room temperature for 14-20 h and then take out, wash and dry to obtain modified cotton fibers;

[0018] Step B3: Immerse the modified cotton fibers in a silver nitrate solution with a concentration of 1.8 - 2.2 g / L, with a bath ratio of 1:(40 - 60). After impregnation treatment at 85 - 95 °C for 0.8 - 1.2 h, take them out, wash, and dry to obtain functionalized cotton fibers. In the above process, chitosan is covalently bonded to the cotton fibers with citric acid as a cross-linking agent to obtain surface-modified cotton fibers. The surface-modified cotton fibers have more hydrophilic groups (amino, carboxyl, hydroxyl) and have good antibacterial properties. Then, through the amidation reaction between the amino group on the surface-modified cotton fibers and the carboxyl group of α-lipoic acid, dynamic disulfide bonds are introduced onto the cotton fibers, thereby obtaining modified cotton fibers. Further, the cleavage of the dynamic disulfide bonds can generate sulfhydryl groups. The presence of amino and sulfhydryl groups on the surface of the modified cotton fibers can promote the reduction and deposition of silver nanoparticles on the surface of the cotton fibers, and various active groups in the modified cotton fibers can coordinate with the nanoparticles to encapsulate the silver nanoparticles in the disulfide bond network, preventing the shedding of silver nanoparticles. Due to the antibacterial properties and strong ultraviolet absorption ability of silver nanoparticles, the cotton fibers are endowed with persistent antibacterial properties and ultraviolet resistance.

[0019] Further, in the second step, the fineness of the core layer second yarn is 50 D; the mass ratio of the functionalized cotton fibers, ultra-fine polyethylene fibers, and temperature-controlled fibers is (7 - 8):(4 - 5):(2 - 3).

[0020] Preferably, in the third step, the pretreated cortical first yarn and the core layer second yarn respectively account for 40 - 46% and 54 - 60% of the total mass of the lightweight sweat-wicking and quick-drying double-layer woven fabric with a skin-core structure. The two layers of the lightweight sweat-wicking and quick-drying double-layer woven fabric with a skin-core structure are hooked by the pretreated cortical first yarn; the warp density design range of the lightweight sweat-wicking and quick-drying double-layer woven fabric with a skin-core structure is 40 - 65 ends / cm, the weft density design range is 35 - 65 picks / cm, and the fabric gram weight is 100 - 140 g / m 2 。

[0021] The lightweight sweat-wicking and quick-drying double-layer woven fabric with a skin-core structure prepared by using the preparation method of the lightweight sweat-wicking and quick-drying double-layer woven fabric with a skin-core structure.

[0022] The application of the lightweight sweat-wicking and quick-drying double-layer woven fabric with a skin-core structure in the fields of sportswear, outdoor equipment, and military protection.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure of the present invention has a double-layer structure. Its skin layer is made of functionalized polyester fiber and polypropylene fiber, and has excellent hydrophobic, antibacterial and anti-ultraviolet properties; the core layer is made of functionalized cotton fiber, ultra-fine polyethylene fiber and temperature-controlled fiber, and has excellent hydrophilic, antibacterial and anti-ultraviolet properties; the core layer utilizes the hydrophilic moisture absorption of ultra-fine fiber and natural material cotton fiber to quickly absorb sweat and guide it to the hydrophobic skin layer. The hydrophilicity difference between the skin layer and the core layer enables sweat to be quickly absorbed from the inner layer and evaporated through the outer layer, while preventing the penetration of external moisture. In addition, micropores are formed by laser drilling on the first yarn of the pretreated skin layer, forming tiny "moisture-discharging and water-conducting channels" in the skin layer. Combined with the strong moisture-absorbing core layer of the inner layer, it can achieve rapid moisture flow and drying not only relying on the moisture absorption of fibers, improving the moisture absorption, sweat-conducting and quick-drying performance of the fabric; in addition, the weight of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure of the present invention is less than 150 g / m 2 , and has the characteristics of lightness and thinness, and can be widely used in the fields of sportswear, outdoor equipment and military protection, etc.;

[0025] 2. The core layer of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure of the present invention contains temperature-controlled fiber, in which polyethylene glycol is encapsulated as a phase change material, so that the temperature-controlled fiber has two-way temperature regulation performance, improving the comfort of the fabric;

[0026] 3. The functionalized cotton fiber in the core layer of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure of the present invention has better hydrophilic moisture absorption than natural cotton fiber, and due to the introduction of its surface dynamic disulfide bond network, it can realize the reduction deposition and encapsulation of nano-silver, thereby endowing the functionalized cotton fiber with persistent antibacterial and anti-ultraviolet properties. The grafting of chitosan oligosaccharide on the surface of cotton fiber synergizes with nano-silver to further improve the antibacterial performance of cotton fiber;

[0027] 4. The hydrophobicity of the functionalized polyester fiber in the skin layer of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure of the present invention is improved compared with polyester fiber, thanks to the silicon chain segment on the surface of modified nano-zinc oxide and the fluorinated long chain of the intermediate product in the multifunctional polyurethane emulsion. In addition, since nano-zinc oxide also endows the functionalized polyester fiber with antibacterial and anti-ultraviolet properties; further, a large number of amino groups on the surface of modified nano-zinc oxide in the multifunctional polyurethane can react with the epoxy groups on the surface of the surface-modified polyester fiber, improving the antibacterial, anti-ultraviolet, hydrophobic and wash-resistant properties of the functionalized polyester fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a process flow chart of the preparation method of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure of the present invention;

[0029] Figure 2 It is a test comparison chart of the antibacterial rates of Escherichia coli and Staphylococcus aureus of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure prepared in Examples 3-5 and Comparative Examples 1-4 of the present invention;

[0030] Figure 3 It is a test comparison chart of the moisture permeability of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure prepared in Examples 3-5 and Comparative Examples 1-4 of the present invention;

[0031] Figure 4 It is a test comparison chart of the evaporation rate of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure prepared in Examples 3-5 and Comparative Examples 1-4 of the present invention. Detailed implementation manners

[0032] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] Example 1

[0034] This example discloses a preparation method of a multifunctional polyurethane emulsion, including the following steps:

[0035] Step A1: Dry nano-zinc oxide at 100 °C for 24 h to obtain pretreated nano-zinc oxide. Take 4.5 g of pretreated nano-zinc oxide, 150 g of distilled water, and 60 g of ethanol, mix them, and ultrasonically disperse for 80 min to obtain a nano-zinc oxide dispersion; mix 1.4 g of silane coupling agent KH-550, 75 g of distilled water, and 60 g of ethanol, perform hydrolysis treatment for 30 min, then add acetic acid to adjust the pH to 5.5, then add the above nano-zinc oxide dispersion, and stir at 75 °C for 3 h. After the reaction ends, cool to room temperature, centrifugally wash 4 times with absolute ethanol, and dry to obtain modified nano-zinc oxide;

[0036] Step A2: In a nitrogen atmosphere, add 3 g of perfluorooctanoyl chloride to 17.5 mL of tetrahydrofuran, then add 7.5 mL of a 2-hydroxy-1,3-propanediamine / methanol solution with a concentration of 0.1 g / mL, react at room temperature for 14 h, then add 7.8 mL of a sodium bicarbonate aqueous solution with a mass fraction of 7.5%, perform suction filtration, and vacuum-dry the obtained precipitate product at 65 °C to obtain an intermediate product;

[0037] Step A3: Vacuum-dry polybutylene glycol at 75 °C for 25 h. Under a nitrogen atmosphere, mix 5.5 g of polybutylene glycol and 7.8 g of isophorone diisocyanate, stir at 80 °C for 2 h, then add 0.6 g of 2,2-dimethylolpropionic acid and 0.003 g of dibutyltin dilaurate, react at 75 °C for 1 h, then cool to 70 °C, add 0.8 g of 1,4-butanediol and react for 1 h, then add 0.4 g of the intermediate product and react for 2 h, and then add 0.6 g of modified nano-zinc oxide and react for 2 h. Add 6 g of acetone during the reaction to reduce the viscosity. Subsequently, transfer the reaction mixture to a 45 °C water bath, add 0.5 g of triethylamine to neutralize the reaction for 0.5 h. After the reaction ends, cool to 31 °C, add 0.4 g of ethylenediamine and 25 g of deionized water, shear and emulsify at a rotation speed of 3000 r / min for 30 min, and remove acetone by rotary evaporation at 45 °C to obtain a multifunctional polyurethane emulsion.

[0038] Example 2

[0039] This example discloses a preparation method of functionalized cotton fibers, including the following steps:

[0040] Step B1: Add cotton fibers to an aqueous mixed solution containing citric acid and sodium hypophosphite at 80 °C, react for 1.2 h, then add chitosan oligosaccharide, continue to react for 1 h, then take out the cotton fibers, completely dry at 102 °C and then perform thermal polymerization at 150 °C for 3 min, wash and dry to obtain surface-modified cotton fibers; wherein, the mass ratio of cotton fibers, citric acid, sodium hypophosphite, and chitosan oligosaccharide is 1:4:2:2;

[0041] Step B2: Add 3 g of α-lipoic acid, 2.9 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), and 0.9 g of N-hydroxysuccinimide (NHS) to 90 mL of an ethanol aqueous solution with a volume fraction of 50%, mix and stir at room temperature for 3 h to activate the carboxyl group to obtain a treatment solution; add the surface-modified cotton fibers to the above treatment solution, control the bath ratio to 1:20, take out after impregnation treatment at room temperature for 17 h, wash and dry to obtain modified cotton fibers;

[0042] Step B3: Immerse the modified cotton fibers in a silver nitrate solution with a concentration of 2 g / L, with a bath ratio of 1:50, take out after impregnation treatment at 90 °C for 1 h, wash and dry to obtain functionalized cotton fibers.

[0043] Example 3

[0044] This example discloses a preparation method of a lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure, including the following steps:

[0045] Step 1: Glycidyl methacrylate and benzoin ethyl ether are added to acetone and stirred until dissolved to obtain a monomer solution. The concentration of glycidyl methacrylate in the monomer solution is 0.6 mol / L, and the concentration of benzoin ethyl ether is 0.05 mol / L. Polyester fiber is added to the above monomer solution with a bath ratio of 1:15, soaked for 3 h, then irradiated under a 400 W high-pressure mercury lamp for 10 min for ultraviolet grafting reaction. Finally, it is washed successively with xylene, ethanol, and water, and dried to obtain surface-modified polyester fiber. The surface-modified polyester fiber is immersed in a multifunctional polyurethane emulsion with a bath ratio of 1:40, taken out after impregnation treatment at 75 °C for 28 h, washed, and dried to obtain functionalized polyester fiber. The functionalized polyester fiber and polypropylene fiber are mixed at a mass ratio of 6:1 and spun into a first cortical yarn with a fineness of 70 D. Laser drilling is performed on the first cortical yarn to form micropores with a diameter of 1.2 mm on the first cortical yarn, and the gap between adjacent micropores is 5 times the pore diameter of the micropores to obtain a pretreated first cortical yarn;

[0046] Step 2: 15 g of polyethylene glycol is dissolved in 300 g of toluene, then 0.7 g of toluene-2,4-diisocyanate and 0.1 g of dibutyltin dilaurate are added, and the mixture is stirred and reacted at 38 °C for 8.5 h. Then 0.3 g of N-phenyldiethanolamine and 0.1 g of dibutyltin dilaurate are added, and the stirring reaction continues at 78 °C for 8.5 h. Finally, 0.2 g of toluene-2,4-diisocyanate is added and the reaction continues for 3.5 h. The obtained reaction product is vacuum dried at 78 °C for 30 h to obtain a polyurethane phase change material. The polyurethane phase change material is melt-spun into temperature-controlled fiber. Among them, the melt-spinning conditions are: the melting temperature is 120 °C, the spinneret diameter is 0.5 mm, and the spinneret draw ratio is 5. The functionalized cotton fiber, ultra-fine polyethylene fiber, and temperature-controlled fiber are mixed at a mass ratio of 7:4:2 and spun into a second core layer yarn with a fineness of 50 D;

[0047] Step 3: The pretreated first cortical yarn and the second core layer yarn are woven into a lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure by a double-layer plain weave process. The pretreated first cortical yarn and the second core layer yarn respectively account for 40% and 60% of the total mass of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure. The two layers of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure are hooked by the pretreated first cortical yarn. The warp density design range of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure is 40 picks / cm, the weft density design range is 35 picks / cm, and the fabric gram weight is 100 g / m 2 。

[0048] Example 4

[0049] This embodiment discloses a preparation method of a lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure, including the following steps:

[0050] Step 1: Add glycidyl methacrylate and benzoin ethyl ether into acetone, stir and dissolve to obtain a monomer solution, where the concentration of glycidyl methacrylate in the monomer solution is 1.8 mol / L and the concentration of benzoin ethyl ether is 0.15 mol / L; add polyester fiber into the above monomer solution, with a bath ratio of 1:20, soak for 3 h, then irradiate under a 600 W high-pressure mercury lamp for 10 min for ultraviolet grafting reaction, and finally wash successively with xylene, ethanol and water, and dry to obtain surface-modified polyester fiber; immerse the surface-modified polyester fiber into a multifunctional polyurethane emulsion, with a bath ratio of 1:60, take it out after impregnation treatment at 85 °C for 20 h, wash and dry to obtain functionalized polyester fiber; mix the functionalized polyester fiber and polypropylene fiber in a mass ratio of 8:1 and blend them into a skin layer first yarn with a fineness of 70 D; punch holes in the skin layer first yarn through laser drilling to form micropores with a diameter of 1.2 mm on the skin layer first yarn, and the gap between adjacent micropores is 5 times the pore diameter of the micropores to obtain a pretreated skin layer first yarn;

[0051] Step 2: Dissolve 30 g of polyethylene glycol in 500 g of toluene, then add 1.4 g of toluene-2,4-diisocyanate and 0.3 g of dibutyltin dilaurate, stir and react at 42 °C for 7.5 h, then add 0.6 g of N-phenyldiethanolamine and 0.3 g of dibutyltin dilaurate, continue to stir and react at 82 °C for 7.5 h, and finally add 0.2 g of toluene-2,4-diisocyanate and continue to react for 4.5 h. Vacuum dry the obtained reaction product at 82 °C for 20 h to obtain a polyurethane phase change material; the polyurethane phase change material is melt-spun into temperature-controlled fiber, where the melt-spinning conditions are: the melting temperature is 125 °C, the spinneret diameter is 0.5 mm, and the spinneret draw ratio is 6; mix the functionalized cotton fiber, ultra-fine polyethylene fiber and temperature-controlled fiber in a mass ratio of 8:5:3 and blend them into a core layer second yarn with a fineness of 50 D;

[0052] Step 3: Use a double-layer plain weaving process to weave the pretreated skin layer first yarn and the core layer second yarn into a lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure. The pretreated skin layer first yarn and the core layer second yarn respectively account for 46% and 54% of the total mass of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure. The two layers of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure are hooked by the pretreated skin layer first yarn; the warp density design range of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure is 65 picks / cm, the weft density design range is 65 picks / cm, and the fabric weight is 140 g / m 2 。

[0053] Example 5

[0054] This example discloses a preparation method of a lightweight sweat-conducting and quick-drying double-layer woven fabric with a core-shell structure, which includes the following steps:

[0055] Step 1: Add glycidyl methacrylate and benzoin ethyl ether into acetone, stir and dissolve to obtain a monomer solution. The concentration of glycidyl methacrylate in the monomer solution is 1.2 mol / L, and the concentration of benzoin ethyl ether is 0.1 mol / L. Add polyester fibers into the above monomer solution, with a bath ratio of 1:18, soak for 2.5 h, then irradiate under a 500 W high-pressure mercury lamp for 15 min for ultraviolet grafting reaction. Finally, wash successively with xylene, ethanol, and water, and dry to obtain surface-modified polyester fibers. Immerse the surface-modified polyester fibers into a multifunctional polyurethane emulsion, with a bath ratio of 1:50, take them out after impregnation treatment at 80 °C for 24 h, wash, and dry to obtain functionalized polyester fibers. Mix the functionalized polyester fibers and polypropylene fibers in a mass ratio of 7:1 and blend them into a skin-layer first yarn with a fineness of 70 D. Punch holes in the skin-layer first yarn through laser drilling to form micropores with a diameter of 1.2 mm on the skin-layer first yarn, and the gap between adjacent micropores is 5 times the pore diameter of the micropores to obtain a pretreated skin-layer first yarn;

[0056] Step 2: Dissolve 22.5 g of polyethylene glycol in 400 g of toluene, then add 1.1 g of toluene-2,4-diisocyanate and 0.2 g of dibutyltin dilaurate, stir and react at 40 °C for 8 h, then add 0.5 g of N-phenyldiethanolamine and 0.2 g of dibutyltin dilaurate, continue to stir and react at 80 °C for 8 h, and finally add 0.4 g of toluene-2,4-diisocyanate and continue to react for 4 h. Vacuum dry the obtained reaction product at 80 °C for 25 h to obtain a polyurethane phase change material. The polyurethane phase change material is melt-spun to obtain temperature-controlled fibers. Among them, the melt-spinning conditions are: the melting temperature is 123 °C, the spinneret diameter is 0.5 mm, and the spinneret draw ratio is 5.5. Mix the functionalized cotton fibers, ultra-fine polyethylene fibers, and temperature-controlled fibers in a mass ratio of 7.5:4.5:2.5 and blend them into a core-layer second yarn with a fineness of 50 D;

[0057] Step 3: Use a double-layer plain weaving process to weave the pretreated skin-layer first yarn and the core-layer second yarn into a lightweight sweat-conducting and quick-drying double-layer woven fabric with a core-shell structure. The pretreated skin-layer first yarn and the core-layer second yarn respectively account for 43% and 57% of the total mass of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a core-shell structure. The two layers of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a core-shell structure are hooked by the pretreated skin-layer first yarn. The warp density design range of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a core-shell structure is 50 picks / cm, the weft density design range is 52 picks / cm, and the fabric gram weight is 132 g / m2 .

[0058] The multifunctional polyurethane emulsion and functionalized cotton fiber used in the above-mentioned Examples 3-5 are the multifunctional polyurethane emulsion prepared in Example 1 and the functionalized cotton fiber prepared in Example 2.

[0059] Comparative Example 1

[0060] Compared with Example 5, in the process of preparing the functionalized polyester fiber in Comparative Example 1, polyester fiber was used instead of the surface-modified polyester fiber, and other conditions remained unchanged.

[0061] Comparative Example 2

[0062] Compared with Example 5, in the process of preparing the first yarn of the skin layer in Comparative Example 2, the surface-modified polyester fiber is used instead of the functionalized polyester fiber, and other conditions remain unchanged.

[0063] Comparative Example 3

[0064] Compared with Example 5, in the process of preparing the second yarn of the core layer in Comparative Example 3, modified cotton fiber is used instead of functionalized cotton fiber, and other conditions remain unchanged.

[0065] Comparative Example 4

[0066] Compared with Example 5, in the process of preparing the second yarn of the core layer in Comparative Example 4, cotton fiber is used instead of functionalized cotton fiber, and other conditions remain unchanged.

[0067] In the above embodiments and comparative examples, polybutylene glycol (PTMG, Mn≈2000) was purchased from Jining Fangde Chemical Co., Ltd.; nano zinc oxide, with an average particle size of 30 nm, was purchased from Zhejiang Weiyixin New Material Technology Co., Ltd.; chitosan oligosaccharide, with Mn≈1500Da, was purchased from Shanxi Nanba Biochemical Co., Ltd.; the fineness of ultrafine polyethylene fiber was 1500D, purchased from Dongguan Sovit Special Wire and Tape Co., Ltd.; polyethylene glycol (PEG, Mn = 10,000) was purchased from Aladdin Company and dried at 80°C in a vacuum drying oven for 48 hours before use.

[0068] Experimental example

[0069] Performance tests were performed on the thin, sweat-conducting, quick-drying double-layer woven fabrics with a skin-core structure prepared in Examples 3-5 and Comparative Examples 1-4.

[0070] 1. Antibacterial performance test: According to the international standard GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", the test bacteria are Escherichia coli and Staphylococcus aureus.

[0071] II. Anti-ultraviolet performance test: Refer to AATCC 183–2010 to test the ultraviolet protection factor (UPF) of each fabric sample.

[0072] III. Moisture absorption and quick-drying performance test: Detect the evaporation rate according to the national standard GB / T 21655.1-2023, and test the moisture permeability according to the national standard GB / T12704-2009 to characterize the moisture absorption and quick-drying performance.

[0073] The test results are shown in Table 1:

[0074]

[0075] It can be seen from the test results in Table 1 that the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure prepared in Examples 3-5 of the present invention has excellent moisture absorption, sweat discharge and quick-drying performance, durable antibacterial performance and anti-ultraviolet performance.

[0076] It can be seen from the comparison between Comparative Example 1 and Example 5 that introducing epoxy groups by surface modification of polyester fibers can better combine the polyurethane in the polyurethane emulsion with polyester fibers, thereby improving the antibacterial performance, anti-ultraviolet performance, hydrophobic performance and wash resistance of the functionalized polyester fibers; it can be seen from the comparison between Comparative Example 2 and Example 5 that through the treatment of the surface of the surface-modified polyester fibers with a multifunctional polyurethane emulsion, the silicon chain segments on the surface of the modified nano-zinc oxide and the fluorinated long chains of the intermediate products in the multifunctional polyurethane emulsion endow the functionalized polyester fibers with excellent antibacterial performance, anti-ultraviolet performance and hydrophobic performance. The improvement of its hydrophobic performance increases the hydrophilicity difference between the skin layer and the core layer of the lightweight sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure, promotes the export of sweat, and thus improves the moisture absorption, sweat discharge and quick-drying performance of the fabric; it can be seen from the comparison between Comparative Example 3 and Example 5 that the deposition and encapsulation of nano-silver in the functionalized cotton fibers endow the cotton fibers with durable antibacterial performance and anti-ultraviolet performance; it can be seen from the comparison between Comparative Example 4 and Example 5 that compared with natural cotton fibers, the functionalized cotton fibers have improved various properties due to the introduction of more hydrophilic groups and the grafting of nano-silver and chitosan.

[0077] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a light, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure, characterized in that: The following steps are involved: Step 1: modifying polyester fiber by glycidyl methacrylate to obtain surface-modified polyester fiber; immersing the surface-modified polyester fiber in a multifunctional polyurethane emulsion to obtain a functionalized polyester fiber; blending the functionalized polyester fiber and polypropylene fiber into a first skin yarn; punching the first skin yarn by laser to form a microporous structure to obtain a pretreated first skin yarn; wherein the preparation method of the multifunctional polyurethane emulsion comprises the following steps: step A1: modifying nano zinc oxide by using a silane coupling agent KH-550 to obtain modified nano zinc oxide; step A2: reacting perfluorooctanoyl chloride with 2-hydroxy-1,3-propylenediamine to obtain an intermediate product; step A3: introducing the modified nano zinc oxide and the intermediate product into a polyurethane structure to prepare a multifunctional polyurethane emulsion; Step 2, prepare polyurethane phase change material; the polyurethane phase change material is melt-spun to obtain temperature-controlled fiber; functionalized cotton fiber, ultrafine polyethylene fiber, and temperature-controlled fiber are blended into a core layer second yarn; the preparation method of the functionalized cotton fiber comprises the following steps: step B1, adding cotton fiber to a water mixed solution containing citric acid and sodium hypophosphite at 75-85°C, reacting for 1-1.5h, then adding chitosan oligosaccharide, continuing the reaction for 0.8-1.2h, taking out the cotton fiber, completely drying at 100-105°C, and then thermally polymerizing at 145-155°C for 2-4min, washing, and drying to obtain surface-modified cotton fiber; wherein the mass ratio of cotton fiber, citric acid, sodium hypophosphite, and chitosan oligosaccharide is 1:4:2:(1.5-2.5); step B2, adding α-lipoic acid, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide Imine hydrochloride and N-hydroxysuccinimide are added to an ethanol aqueous solution, mixed and stirred at room temperature for 2-4 hours to obtain a treatment solution; wherein the amount ratio of α-lipoic acid, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide, and ethanol aqueous solution is (2-4) g: (1.9-3.8) g: (0.6-1.2) g: (80-100) mL; surface modified cotton fiber is added to the above treatment solution, the bath ratio is controlled to be 1: (15-25), and the surface modified cotton fiber is taken out after immersion treatment at room temperature for 14-20 hours, washed, and dried to obtain modified cotton fiber; step B3, immersing the modified cotton fiber in a silver nitrate solution with a concentration of 1.8-2.2 g / L, the bath ratio is 1: (40-60), and the surface modified cotton fiber is taken out after immersion treatment at 85-95°C for 0.8-1.2 hours, washed, and dried to obtain functionalized cotton fiber; Step 3: Use a double-layer plain weave process to weave the pretreated skin layer first yarn and the core layer second yarn into a light, sweat-wicking, quick-drying double-layer woven fabric with a skin-core structure.

2. The method for preparing the light, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure according to claim 1, characterized in that: In the step 1, the fineness of the first yarn of the cortex is 70D; the mass ratio of the functional polyester fiber to the polypropylene fiber is (6-8):1; the diameter of the micropores on the pretreated first yarn of the cortex is 0.5-2 mm, and the gap between adjacent micropores is 4-6 times the diameter of the micropores.

3. The method for preparing the light, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure according to claim 1, characterized in that: In the step 1, the preparation method of the functionalized polyester fiber comprises: adding glycidyl methacrylate and benzoin ethyl ether to acetone, stirring and dissolving to obtain a monomer solution, wherein the concentration of glycidyl methacrylate in the monomer solution is 0.6-1.8 mol / L, and the concentration of benzoin ethyl ether is 0.05-0.15 mol / L; adding the polyester fiber to the monomer solution for soaking treatment, and then performing ultraviolet light grafting reaction, washing, and drying to obtain the surface-modified polyester fiber; wherein the soaking treatment Treatment conditions: bath ratio of 1: (15-20), immersion time of 2-3h; UV grafting reaction conditions: irradiation under a 400-600W high-pressure mercury lamp, UV grafting reaction time of 10-20min; immersing the surface modified polyester fiber in the multifunctional polyurethane emulsion, taking it out after immersion treatment, washing, and drying to obtain functionalized polyester fiber; wherein, the immersion treatment conditions: bath ratio of 1: (40-60), immersion temperature of 75-85°C, immersion time of 20-28h.

4. The method for preparing the light, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure according to claim 1, characterized in that: In the step 1, the preparation method of the multifunctional polyurethane emulsion specifically comprises the following steps: Step A1, drying nano zinc oxide at 80-120°C for 20-28h to obtain pretreated nano zinc oxide; mixing the pretreated nano zinc oxide, distilled water and ethanol, and ultrasonically dispersing for 60-100min to obtain a nano zinc oxide dispersion; wherein the mass ratio of the pretreated nano zinc oxide, distilled water and ethanol is (3-6): (100-200): (40-80); mixing silane coupling agent KH-550, distilled water and ethanol in a mass ratio of (0.9-1.8): (50-100): (40-80), hydrolyzing for 20-40min, adding acetic acid to adjust the pH to 5-6, and then adding the above nano zinc oxide dispersion, stirring at 70-80°C for 2-4h, cooling to room temperature after the reaction, washing and drying to obtain modified nano zinc oxide; Step A2, in a nitrogen atmosphere, add perfluorooctanoyl chloride to tetrahydrofuran, then add 2-hydroxy-1,3-propylenediamine / methanol solution, react at room temperature for 12-16 hours, then add sodium bicarbonate aqueous solution, filter and dry to obtain an intermediate product; wherein the amount ratio of perfluorooctanoyl chloride, tetrahydrofuran, 2-hydroxy-1,3-propylenediamine / methanol solution and sodium bicarbonate aqueous solution is (2-4) g: (10-25) mL: (5-10) mL: (5.2-10.4) mL; Step A3, vacuum drying polybutylene glycol, mixing polybutylene glycol and isophorone diisocyanate in a nitrogen atmosphere, stirring at 78-82°C for 1.5-2.5h, then adding 2,2-dihydroxymethylpropionic acid and dibutyltin dilaurate, reacting at 74-76°C for 0.8-1.2h, then cooling to 68-72°C, adding 1,4-butanediol for 0.8-1.2h, then adding the intermediate product for 1.5-2.5h, then adding modified nano zinc oxide for 1.5-2.5h, adding acetone during the reaction, then transferring the reaction mixture to a 43-48°C water bath, adding triethylamine for neutralization reaction for 0.4-0.6h. After the reaction is completed, the mixture is cooled, ethylenediamine and deionized water are added, sheared and emulsified, and rotary evaporated to obtain a multifunctional polyurethane emulsion; wherein the mass ratios of polybutylene glycol, isophorone diisocyanate, 2,2-dihydroxymethylpropionic acid, dibutyltin dilaurate, 1,4-butanediol, intermediate product, modified nano zinc oxide, acetone, triethylamine, ethylenediamine, and deionized water are (3.5-7.5): (2-5.5): (0.4-0.8): (0.001-0.005): (0.6-1): (0.3-0.5): (0.4-0.7): (2-10): (0.3-0.6): (0.3-0.5): (20-30).

5. The method for preparing the light, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure according to claim 1, characterized in that: In the step 2, the preparation method of the temperature-controlled fiber is as follows: polyethylene glycol is dissolved in toluene, and then toluene-2,4-diisocyanate and dibutyltin dilaurate are added, and the mixture is stirred and reacted at 38-42°C for 7.5-8.5h, and then N-phenyldiethanolamine and dibutyltin dilaurate are added, and the mixture is stirred and reacted at 78-82°C for 7.5-8.5h, and finally toluene-2,4-diisocyanate is added and the mixture is continued to react for 3.5-4.5h, and the obtained reaction product is vacuum dried to obtain polyurethane. Ester phase change material; wherein, the mass ratio of polyethylene glycol, toluene, toluene-2,4-diisocyanate, dibutyltin dilaurate, and N-phenyldiethanolamine is (15-30): (300-500): (0.2-0.6): (0.001-0.005): (0.3-0.6); the polyurethane phase change material is melt-spun to obtain a temperature-controlled fiber, wherein the melt spinning conditions are: a melting temperature of 120-125°C, a spinneret diameter of 0.5mm, and a spinneret stretching ratio of 5-6.

6. The method for preparing the light, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure according to claim 1, characterized in that: In the step 2, the fineness of the second yarn of the core layer is 50D; the mass ratio of the functional cotton fiber, the ultrafine polyethylene fiber, and the temperature control fiber is (7-8): (4-5): (2-3).

7. The method for preparing the light, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure according to claim 1, characterized in that: In the step 3, the pretreated first yarn of the skin layer and the second yarn of the core layer account for 40-46% and 54-60% of the total mass of the thin sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure, respectively; the two layers of the thin sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure are connected by the pretreated first yarn of the skin layer; the thin sweat-conducting and quick-drying double-layer woven fabric with a skin-core structure has a warp density design range of 40-65 strands / cm, a weft density design range of 35-65 strands / cm, and a fabric weight of 100-140g / m 2 .

8. A thin, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure prepared by the method for preparing a thin, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure as described in any one of claims 1 to 7.

9. Application of the light, sweat-conducting, quick-drying double-layer woven fabric with a skin-core structure according to claim 8 in the fields of sportswear, outdoor equipment, and military protection.

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