High-breathability moisture-absorption sweat-absorption band fiber material and preparation method thereof

Abstract

The invention discloses a highly breathable moisture-absorbing and sweat-absorbing fiber material and a preparation method thereof.The material achieves function synergy through modified hollow polyester and gel structure modified nylon 6, and the preparation process comprises the steps that firstly, a hollow polyester base material is prepared through a carbon dioxide assisted melt co-spinning technology, PVP is dissolved and reduced by spraying an ethyl alcohol / coupling agent mixed solution, and the hollow polyester base material is prepared; a through pore channel is formed and the surface hydrophobicity is improved; then catalyzing in-situ ring opening polymerization of epsilon-caprolactam through modified nano-silica, and constructing a sulfonic group modified nano-silica gel structure in a nylon 6 matrix to form a strong hydrophilic effect; finally, the modified polyester and the nylon 6 are compounded by adopting a hot pressing process, so that the material has high air permeability of the hollow polyester and high moisture absorption of the modified nylon 6; compared with a traditional fiber material, through multi-layer pore channel design and hydrophilic and hydrophobic interface regulation and control, the industrial problem that breathability and moisture absorption performance restrict each other is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of fiber materials technology, specifically to a highly breathable, moisture-wicking, and sweat-absorbing fiber material and its preparation method. Background Technology

[0002] With the increasing demand for functional textiles, fiber materials with high-efficiency moisture absorption and breathability have become a research hotspot. Polyester and nylon, as the two mainstream materials in the field of synthetic fibers, have advantages such as high strength and good abrasion resistance, but their inherent properties limit their application in the field of moisture absorption and breathability. To improve the moisture absorption of fibers, existing technologies mostly adopt surface coating or blending modification. Some literature reports blending polyvinylpyrrolidone (PVP) with polyester to introduce hydrophilic groups; however, PVP is prone to dissolving in humid and hot environments, resulting in unsustainable modification effects. Hollow fiber structures are considered an effective way to improve breathability, such as preparing hollow polyester by injecting carbon dioxide during melt spinning; however, a single hollow structure is prone to collapse and lacks synergistic control over porosity and surface chemical properties. In terms of nylon modification, nano-silica is widely used to enhance the performance of composite materials due to its high specific surface area and reactivity. In recent years, researchers have attempted to modify nanoparticles with strong hydrophilic groups such as sulfonic acid groups and carboxylic acid groups. For example, maleic anhydride grafted with silica enhances the moisture absorption of nylon. However, such modifications often sacrifice the mechanical strength of the material, and when combined with hollow polyester, poor interfacial compatibility leads to delamination problems.

[0003] In existing technologies, the preparation of composite fiber materials often employs simple lamination or blending spinning, such as hot-pressing hollow polyester with hydrophilic nylon. However, this approach fails to address the issues of synergistic effects between hollow structure stability and hydrophilic modification, leading to a decrease in air permeability with repeated use. Furthermore, the interfacial interaction between nanomaterials and the polymer matrix is ​​weak in traditional processes, making it difficult to achieve a balance between moisture absorption, air permeability, and mechanical strength. Therefore, there is an urgent need to develop a fiber material that combines a stable hollow structure, high hydrophilicity, and excellent mechanical properties, and to establish an efficient preparation method to overcome the current technological bottlenecks. Summary of the Invention

[0004] The purpose of this invention is to provide a highly breathable, moisture-wicking, and sweat-absorbing fiber material and its preparation method to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a highly breathable, moisture-wicking, and sweat-absorbing belt fiber material, wherein the highly breathable, moisture-wicking, and sweat-absorbing belt fiber material is obtained by spraying a silane coupling agent onto the surface of pre-modified hollow polyester and then hot-pressing it with gel-structure modified nylon 6.

[0006] Furthermore, the pre-modified hollow polyester is prepared by melt-co-spinning common hydrophobic modified polyester with polyvinylpyrrolidone, injecting carbon dioxide, and then atomizing and spraying a 50℃-60℃ ethanol / coupling agent mixed solution through a cold water bath. It is then prepared by atomizing and spraying the ethanol / coupling agent mixed solution through a cold water bath.

[0007] Furthermore, the gel-structure modified nylon 6 is prepared by adding aminated nano-silica and modified nano-silica to ε-caprolactam monomer and controlling the ratio.

[0008] Furthermore, the aminated nano-silica and modified nano-silica are prepared by reacting nano-silica with 3-aminopropylmethyldimethoxysilane to obtain aminated nano-silica, and then adding maleic anhydride, an activator, and sodium cysteine ​​sulfonic acid carboxylate to obtain modified nano-silica.

[0009] Furthermore, the sodium cysteine ​​sulfonic acid carboxylate is prepared by oxidizing cysteine ​​with sodium oxide and then adjusting the pH.

[0010] Furthermore, a method for preparing a highly breathable, moisture-wicking, and sweat-absorbing fiber material includes the following preparation steps:

[0011] (1) During the polymerization of hydrophobic polyester raw materials, when the temperature rises to 260℃, 10-30% of the total mass of polyester polyvinylpyrrolidone is added. After slurrying and stirring, carbon dioxide at 0.5-3L / min is introduced and held at this temperature for 3min. Then, it is moved to a cold water bath at 5-15℃ for 3min to cure. After that, it is atomized and sprayed with a 50℃-60℃ ethanol / coupling agent mixed solution for 2h. Finally, it is cured again in a cold water bath at 5-15℃ for 3min to obtain pre-modified hollow polyester.

[0012] (2) Modified hollow polyester is obtained by atomizing and spraying the pre-modified hollow polyester with the ethanol / coupling agent mixed solution described in step (1) for 2 hours.

[0013] (3) Add deionized water, 3-aminopropylmethyldimethoxysilane, and anhydrous ethanol and stir for 0.5 h to allow 3-aminopropylmethyldimethoxysilane to be fully hydrolyzed; take 20 g of nano silica and add it to a three-necked flask, then add nano silica, deionized water, and anhydrous ethanol, then heat and stir to disperse. After heating to 60 °C, add the prepared hydrolysate of 3-aminopropylmethyldimethoxysilane dropwise to the three-necked flask at 20 d / min; after the reaction is complete, vacuum filter, place the filter in a forced-air drying oven at 65 °C and dry for 8 h, then grind to obtain aminated nano silica;

[0014] (4) Add maleic anhydride and 10g of aminated nano silica and stir to mix. Add 100mL of acidic activator as solvent and stir to react at 25-40℃ for 12-18h. Then add 20g of cysteine ​​sulfonic acid-carboxylic acid sodium salt and 100mL of phosphate buffer with pH=4.5. Stir at room temperature for 6-8h. After the reaction is completed, centrifuge and filter with deionized water until neutral. Place the filter in a forced-air drying oven at 60℃ for 12h to obtain modified nano silica.

[0015] (5) Add 5g of aminated nano silica to 100mL of diethylene glycol butyl ether / water mixed solvent containing 10g of ε-caprolactam monomer, and heat to 100-140℃ for 2h under nitrogen protection; then cool the system to 80-90℃, add 5-15g of modified nano silica, and add 100mL of 1-3% NaOH solution as a catalyst to continue the reaction for 3h; after the reaction is completed, immerse the product in 500mL of anhydrous ethanol to precipitate, wash with deionized water until neutral to remove residual solvent and catalyst, and freeze-dry at -45℃ for 24h to obtain gel-structured modified nylon 6;

[0016] (6) Modified hollow polyester and gel-structured modified nylon 6 are combined together by hot pressing.

[0017] Furthermore, in step (1), the volume ratio of ethanol to coupling agent in the ethanol / coupling agent mixed solution is 10:3, and the coupling agent used is one of tridecafluorooctyltriethoxysilane, octadecyltrimethoxysilane, and isopropyltrititanate.

[0018] Furthermore, in step (3), the volume ratio of deionized water, 3-aminopropylmethyldimethoxysilane, and anhydrous ethanol is 1:1:10; and in the nano-silica reaction, the volume ratio of deionized water and anhydrous ethanol is 2:7.

[0019] Furthermore, in step (4), the mass ratio of maleic anhydride and aminated nano-silica added is 3:10; the acidic activator is a combination of EDC and NHS and the molar ratio of EDC and NHS is 1:1-1.4.

[0020] Furthermore, in step (4), cysteine ​​sulfonic acid-carboxylate sodium salt is prepared by mixing cysteine ​​and sodium peroxide at a mass ratio of 1:2, dissolving in ice water at 0-5℃, stirring slowly and controlling the pH to 8-9, reacting for 2 hours to oxidize the thiol group to the sulfonic acid group, then adjusting the pH to 10-11, adding 100mL of 10-30% NaOH solution to neutralize the carboxyl group to sodium carboxylate, and finally precipitating and purifying with 500mL of anhydrous ethanol and centrifuging to obtain cysteine ​​sulfonic acid-carboxylate sodium salt.

[0021] Furthermore, in step (5), the volume ratio of diethylene glycol butyl ether to water in the diethylene glycol butyl ether / water mixed solvent is 8:2.

[0022] Furthermore, in step (6), the hot pressing process involves layering modified hollow polyester and gel-structured modified nylon 6 at a volume ratio of 1:0.8-1.2, hot pressing them in a flatbed hot press at 210-230℃ and 8-16MPa pressure for 60-120s, and then holding the pressure and cooling to 50℃ or below to demold, thereby obtaining a highly breathable, moisture-wicking, and sweat-absorbing fiber material with a gradient pore structure.

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

[0024] The fiber material prepared by this invention includes a modified hollow inner layer and a gel structure modified outer layer to achieve the effects of breathability, moisture absorption, sweat absorption, and high support strength.

[0025] First, polyester is co-spun with polyvinylpyrrolidone (PVP), and carbon dioxide is injected into the molten co-spun mixture. By controlling the pressure and adjusting the temperature, microbubbles are formed inside the composite fiber. The hollow structure of the microbubbles is then solidified by a cold water bath, and a 50℃-60℃ ethanol / coupling agent mixture is sprayed onto it to decompose the internal PVP co-spun material. Then, the hollow structure of the modified polyester is shaped by a cold water bath, and a coupling agent is sprayed onto it again to obtain the inner hollow modified polyester. This gives the inner polyester a porosity that is different from the traditional sense, thereby achieving rapid drainage and perspiration wicking and high breathability.

[0026] Secondly, in the preparation of the outer modified nylon 6, nano-silica is first reacted with 3-aminopropylmethyldimethoxysilane to obtain high-density aminated nano-silica. Then, maleic anhydride, an activator, and sodium cysteine ​​sulfonic acid carboxylate are added. The anhydride and amino groups combine to form amide bonds and carboxyl groups. Under the action of the activator, the carboxyl groups react with the amino groups on the sodium cysteine ​​sulfonic acid carboxylate to introduce sulfonic acid groups, thus obtaining modified nano-silica. Then, taking advantage of the ring-opening polymerization characteristics of nylon 6, aminated nano-silica and modified sodium cysteine ​​sulfonic acid carboxylate are added... The proportion of nano-silica is controlled so that the amino groups on the aminated nano-silica will initiate a ring-opening reaction and combine with ε-caprolactam to form amide bonds, thus forming an aerogel filling structure that improves breathability. Subsequently, the carboxyl anions contained in the cysteine ​​sulfonic acid-carboxylate sodium salt on the modified nano-silica side chains will also participate in the ring-opening reaction and be embedded in the nylon chain to disperse the modified nano-silica. This allows nylon 6 to undergo a ring-opening reaction and obtain a gel structure, while introducing hydrophilic groups to obtain modified nylon 6, improving its moisture absorption and sweat absorption properties and enhancing the overall structural support strength. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The testing methods for various indicators of a highly breathable, moisture-wicking, and sweat-absorbing fiber material produced in the following embodiments are as follows:

[0029] Air permeability: The air permeability of the fiber materials prepared in the examples and comparative examples was determined in accordance with the provisions of GB / T 9995-2000 Textiles - Determination of air permeability of fabrics.

[0030] Hygroscopicity: The hygroscopicity of the fiber materials prepared in the examples and comparative examples was determined in accordance with the provisions of GB / T 9994-2018 Test Method for Hygroscopicity of Textile Materials (Oven Method).

[0031] Example 1

[0032] (1) During the polymerization of 100g YZH-80 polyester raw material, when the temperature rises to 260℃, 10% of the total mass of polyester polyvinylpyrrolidone is added. After slurrying and stirring, carbon dioxide at 0.5L / min is introduced and held at this temperature for 3min. Then, it is transferred to a 15℃ cold water bath for curing for 3min. After that, it is atomized and sprayed with a 50℃ ethanol / tridecylfluorooctyltriethoxysilane mixed solution for 2h. The volume ratio of ethanol to tridecylfluorooctyltriethoxysilane is 10:3, and the mass ratio of the mixed solution to the polyester raw material is 10:1. Finally, it is cured again in a 15℃ cold water bath for 3min to obtain pre-modified hollow polyester.

[0033] (2) The modified hollow polyester was prepared by atomizing and spraying the pre-modified hollow polyester with the ethanol / tridecylfluorooctyltriethoxysilane mixed solution at 50°C in step (1) for 2 hours. The mass ratio of the mixed solution to the polyester raw material was 10:1.

[0034] (3) Add 200 mL of deionized water, 3-aminopropylmethyldimethoxysilane, and anhydrous ethanol in a volume ratio of 1 (deionized water): 1 (3-aminopropylmethyldimethoxysilane): 10 (anhydrous ethanol). Add 0.1 M hydrochloric acid to adjust the pH to 4.5. Stir at 200 rpm for 0.5 h to allow the 3-aminopropylmethyldimethoxysilane to fully hydrolyze. Take 20 g of nano-silica and add it to a three-necked flask. Add 40 mL of deionized water and 140 mL of anhydrous ethanol. Then heat and stir at 300 rpm to disperse. After heating to 60 °C, the heating rate is 5 °C / min. Add the prepared hydrolysate of 3-aminopropylmethyldimethoxysilane dropwise to the three-necked flask at 20 drops / min. After the reaction is complete, filter the mixture and place the filter in a forced-air drying oven at 65 °C for 8 h. Grind the filter to obtain aminated nano-silica.

[0035] (4) Add 3g maleic anhydride and 10g aminated nano-silica and mix at 300rpm. Add 100mL of EDC and NHS mixed solution (1:1 molar ratio) and 50mL of deionized water as solvent. React at 20℃ for 12h. Then add 20g cysteine ​​sulfonic acid-carboxylate sodium salt and 100mL of phosphate buffer solution (pH=4.5). Stir at 500rpm for 6h at room temperature. After the reaction, centrifuge and wash once at 12000rpm for 3min. Filter with deionized water. Wash until neutral, place the filter material in a forced-air drying oven at 60℃ for 12h to obtain modified nano-silica; wherein cysteine ​​sulfonic acid-carboxylate sodium salt is prepared by cysteine ​​and sodium peroxide at a mass ratio of 1:2. 9g of the mixture is dissolved in 100mL of ice water at 5℃, stirred slowly at 100rpm for 2h, then the pH is adjusted to 10, and 100mL of 10% NaOH solution is added to neutralize the carboxyl group to sodium carboxylate. Finally, it is purified by precipitation with 500mL of anhydrous ethanol and centrifuged at 12000rpm for 3min to obtain the product.

[0036] (5) 5g of aminated nano-silica was added to 100mL of a diethylene glycol butyl ether / water mixed solvent containing 10g of ε-caprolactam monomer, wherein the volume ratio of diethylene glycol butyl ether to water was 8:2. The mixture was heated to 100℃ under nitrogen protection and reacted for 2h. Subsequently, the system was cooled to 80℃, 5g of modified nano-silica was added, and 100mL of 1% NaOH solution was added as a catalyst and the reaction was continued for 3h. After the reaction was completed, the product was immersed in 500mL of anhydrous ethanol to precipitate, washed with deionized water until neutral to remove residual solvent and catalyst, and freeze-dried at -45℃ for 24h to obtain gel-structured modified nylon 6.

[0037] (6) Modified hollow polyester and gel-structured modified nylon 6 are laminated at a volume ratio of 1:0.8 and hot-pressed in a flatbed hot press at 210°C and 8MPa for 60s. Then, the pressure is maintained and cooled to 50°C before demolding to obtain a highly breathable, moisture-wicking, and sweat-absorbing fiber material with a gradient pore structure.

[0038] Example 2

[0039] (1) During the polymerization of 100g YZH-80 polyester raw material, when the temperature rises to 260℃, 20% of the total mass of polyester polyvinylpyrrolidone is added. After slurrying and stirring, carbon dioxide at 2L / min is introduced and held at this temperature for 3min. Then, it is transferred to a 10℃ cold water bath for curing for 3min. After that, it is atomized and sprayed with a 55℃ ethanol / octadecyltrimethoxysilane mixed solution. The volume ratio of ethanol to octadecyltrimethoxysilane is 10:3, and the mass ratio of the mixed solution to the polyester raw material is 10:1. Finally, it is cured again in a 10℃ cold water bath for 3min to obtain pre-modified hollow polyester.

[0040] (2) The pre-modified hollow polyester was atomized and sprayed with the ethanol / octadecyltrimethoxysilane mixed solution at 55°C in step (1) for 2 hours to obtain modified hollow polyester. The mass ratio of the mixed solution to the polyester raw material was 10:1.

[0041] (3) Add 200 mL of deionized water, 3-aminopropylmethyldimethoxysilane, and anhydrous ethanol in a volume ratio of 1 (deionized water): 1 (3-aminopropylmethyldimethoxysilane): 10 (anhydrous ethanol). Add 0.1 M hydrochloric acid to adjust the pH to 4.5. Stir at 200 rpm for 0.5 h to allow the 3-aminopropylmethyldimethoxysilane to fully hydrolyze. Take 20 g of nano-silica and add it to a three-necked flask. Add 40 mL of deionized water and 140 mL of anhydrous ethanol. Then heat and stir at 300 rpm to disperse. After heating to 60 °C, the heating rate is 5 °C / min. Add the prepared hydrolysate of 3-aminopropylmethyldimethoxysilane dropwise to the three-necked flask at 20 drops / min. After the reaction is complete, filter the mixture and place the filter in a forced-air drying oven at 65 °C for 8 h. Grind the filter to obtain aminated nano-silica.

[0042] (4) Add 3g maleic anhydride and 10g aminated nano-silica and mix at 300rpm. Add 100mL of EDC and NHS mixed solution with a molar ratio of 1:1.2 and 50mL of deionized water as solvent. React at 20℃ for 15h. Then add 20g cysteine ​​sulfonic acid-carboxylate sodium salt and 100mL of phosphate buffer solution with pH=4.5. Stir at 500rpm for 7h at room temperature. After the reaction is complete, centrifuge and wash once at 13500rpm for 3min. Use deionized water to extract the solution. The filter was washed until neutral, and the filter was placed in a forced-air drying oven at 60℃ for 12h to obtain modified nano-silica; among them, cysteine ​​sulfonic acid-carboxylate sodium salt was prepared by dissolving 9g of cysteine ​​and sodium peroxide at a mass ratio of 1:2 in 100mL of ice water at 5℃, stirring slowly at 100rpm for 2h, then adjusting the pH to 10, adding 100mL of 20% NaOH solution to neutralize the carboxyl group to sodium carboxylate, and finally precipitating and purifying with 500mL of anhydrous ethanol, and centrifuging at 13500rpm for 3min to obtain the product;

[0043] (5) 5g of aminated nano-silica was added to 100mL of a diethylene glycol butyl ether / water mixed solvent containing 10g of ε-caprolactam monomer, wherein the volume ratio of diethylene glycol butyl ether to water was 8:2. The mixture was heated to 120℃ under nitrogen protection and reacted for 2h. Subsequently, the system was cooled to 85℃, 10g of modified nano-silica was added, and 100mL of 2% NaOH solution was added as a catalyst to continue the reaction for 3h. After the reaction was completed, the product was immersed in 500mL of anhydrous ethanol to precipitate, washed with deionized water until neutral to remove residual solvent and catalyst, and freeze-dried at -45℃ for 24h to obtain gel-structured modified nylon 6.

[0044] (6) Modified hollow polyester and gel-structured modified nylon 6 are laminated in a 1:1 volume ratio and hot-pressed in a flatbed hot press at 220°C and 12MPa for 90s. Then, the pressure is maintained and cooled to 45°C before demolding to obtain a highly breathable, moisture-wicking, and sweat-absorbing fiber material with a gradient pore structure.

[0045] Example 3

[0046] (1) During the polymerization of 100g YZH-80 polyester raw material, when the temperature rises to 260℃, 30% of the total mass of polyester polyvinylpyrrolidone is added. After slurrying and stirring, carbon dioxide at 3L / min is introduced and held at this temperature for 3min. Then, it is transferred to a 5℃ cold water bath for curing for 3min. After that, it is atomized and sprayed with a 60℃ ethanol / isopropyl trititanate mixed solution. The volume ratio of ethanol to isopropyl trititanate is 10:3, and the mass ratio of the mixed solution to the polyester raw material is 10:1. Finally, it is cured again in a 5℃ cold water bath for 3min to obtain pre-modified hollow polyester.

[0047] (2) Modified hollow polyester was prepared by atomizing and spraying the pre-modified hollow polyester with the ethanol / isopropyl trititanate mixed solution at 60°C in step (1) for 2 hours. The mass ratio of the mixed solution to the polyester raw material was 10:1.

[0048] (3) Add 200 mL of deionized water, 3-aminopropylmethyldimethoxysilane, and anhydrous ethanol in a volume ratio of 1 (deionized water): 1 (3-aminopropylmethyldimethoxysilane): 10 (anhydrous ethanol). Add 0.1 M hydrochloric acid to adjust the pH to 4.5. Stir at 200 rpm for 0.5 h to allow the 3-aminopropylmethyldimethoxysilane to fully hydrolyze. Take 20 g of nano-silica and add it to a three-necked flask. Add 40 mL of deionized water and 140 mL of anhydrous ethanol. Then heat and stir at 300 rpm to disperse. After heating to 60 °C, the heating rate is 5 °C / min. Add the prepared hydrolysate of 3-aminopropylmethyldimethoxysilane dropwise to the three-necked flask at 20 drops / min. After the reaction is complete, filter the mixture and place the filter in a forced-air drying oven at 65 °C for 8 h. Grind the filter to obtain aminated nano-silica.

[0049] (4) Add 3g maleic anhydride and 10g aminated nano-silica and mix at high speed (300rpm). Add 100mL of EDC / NHS mixed solution (molar ratio 1:1.4) and 50mL of deionized water as solvent. React at 20℃ for 18h. Then add 20g cysteine ​​sulfonic acid-carboxylate sodium salt and 100mL of phosphate buffer solution (pH=4.5). Stir at high speed (500rpm) for 8h at room temperature. After the reaction, centrifuge and wash once at 15000rpm for 3min. Use deionized water to extract the solution. The filter was washed until neutral, and the filter was placed in a forced-air drying oven at 60℃ for 12h to obtain modified nano-silica; among them, cysteine ​​sulfonic acid-carboxylate sodium salt was prepared by dissolving 9g of cysteine ​​and sodium peroxide at a mass ratio of 1:2 in 100mL of ice water at 5℃, stirring slowly at 100rpm for 2h, then adjusting the pH to 10, adding 100mL of 30% NaOH solution to neutralize the carboxyl group to sodium carboxylate, and finally precipitating and purifying with 500mL of anhydrous ethanol, and centrifuging at 15000rpm for 3min to obtain the product;

[0050] (5) 5g of aminated nano-silica was added to 100mL of a diethylene glycol butyl ether / water mixed solvent containing 10g of ε-caprolactam monomer, wherein the volume ratio of diethylene glycol butyl ether to water was 8:2. The mixture was heated to 140℃ under nitrogen protection and reacted for 2h. Subsequently, the system was cooled to 90℃, 15g of modified nano-silica was added, and 100mL of 3% NaOH solution was added as a catalyst to continue the reaction for 3h. After the reaction was completed, the product was immersed in 500mL of anhydrous ethanol to precipitate, washed with deionized water until neutral to remove residual solvent and catalyst, and freeze-dried at -45℃ for 24h to obtain gel-structured modified nylon 6.

[0051] (6) Modified hollow polyester and gel-structured modified nylon 6 are laminated at a volume ratio of 1:1.2 and hot-pressed in a flatbed hot press at 230°C and 16MPa for 120s. Then, the pressure is maintained and cooled to 40°C before demolding to obtain a highly breathable, moisture-wicking, and sweat-absorbing fiber material with a gradient pore structure.

[0052] Comparative Example 1

[0053] The difference between Comparative Example 1 and Example 2 lies in step (1). Step (1) is changed to: during the polymerization of 100g YZH-80 polyester raw material, when the temperature rises to 260℃, 20% of the total mass of polyester polyvinylpyrrolidone is added, the mixture is stirred and held at this temperature for 3 minutes; then it is transferred to a 10℃ cold water bath for curing for 3 minutes, and then atomized and sprayed with a 55℃ ethanol / octadecyltrimethoxysilane mixed solution for 2 hours. The volume ratio of ethanol to octadecyltrimethoxysilane is 10:3, and the mass ratio of the mixed solution to the polyester raw material is 10:1. Finally, it is cured again in a 10℃ cold water bath for 3 minutes to obtain pre-modified hollow polyester; the remaining steps are the same as in Example 2.

[0054] Comparative Example 2

[0055] The difference between Comparative Example 2 and Example 2 lies in the difference between steps (1) and (2). Steps (1) and (2) are changed to: (1) During the polymerization of 100g YZH-80 polyester raw material, when the temperature rises to 260℃, 20% of the total mass of polyester polyvinylpyrrolidone is added. After slurrying and stirring, carbon dioxide is introduced at 2L / min and held at this temperature for 3min. Then it is transferred to a 10℃ cold water bath for curing for 3min to obtain pre-modified hollow polyester.

[0056] (2) Modified hollow polyester was prepared by atomizing and spraying pre-modified hollow polyester with octadecyltrimethoxysilane at 55°C for 2 hours. The mass ratio of the spraying liquid to the polyester raw material was 10:1. The remaining steps were the same as in Example 2.

[0057] Comparative Example 3

[0058] The difference between Comparative Example 3 and Example 2 lies in step (4). Step (4) is changed to: adding 3g maleic anhydride and 10g aminated nano silica and stirring at 300rpm, adding 100mL of EDC and NHS mixed solution with a molar ratio of 1:1.2 and 50mL of deionized water as solvent, reacting at 20℃ for 15h, centrifuging and washing once after the reaction, centrifuging speed is 13500rpm for 3min, filtering and washing with deionized water until neutral, and placing the filter in a forced-air drying oven at 60℃ for 12h to obtain modified nano silica; the remaining steps are the same as in Example 2.

[0059] Comparative Example 4

[0060] The difference between Comparative Example 4 and Example 2 lies in step (5). Step (5) is changed to: adding 100 mL of a diethylene glycol butyl ether / water mixed solvent containing 10 g of ε-caprolactam monomer, wherein the volume ratio of diethylene glycol butyl ether to water is 8:2, heating the system to 90 °C under nitrogen protection, adding 15 g of modified nano silica, and adding 100 mL of 2% NaOH solution as a catalyst to continue the reaction for 3 h; after the reaction is completed, immersing the product in 500 mL of anhydrous ethanol to precipitate it, washing it with deionized water until neutral to remove residual solvent and catalyst, and freeze-drying it at -45 °C for 24 h to obtain gel-structured modified nylon 6; the remaining steps are the same as in Example 2.

[0061] Example of effect

[0062] Table 1 below shows the performance analysis results of a highly breathable, moisture-wicking, and sweat-wicking fiber material using Examples 1 to 3 and Comparative Examples 1 to 4 of the present invention.

[0063] Table 1

[0064] air permeability (mm / s) Moisture regain % Example 1 835 8.35 Example 2 1049 9.8 Example 3 859 8.68 Comparative Example 1 606 8.23 Comparative Example 2 530 8.36 Comparative Example 3 767 3.77 Comparative Example 4 659 4.69

[0065] A comparison of the experimental data on air permeability and moisture regain between the examples and comparative examples reveals that the present invention significantly improves the overall performance of the fiber material through the synergistic effect of pre-modified hollow polyester and gel-structure modified nylon 6. Firstly, the pre-modified hollow polyester is prepared by melt-spinning polyvinylpyrrolidone (PVP) and injecting carbon dioxide to form a stable hollow structure. This is followed by cold water bath curing and coupling agent spraying to enhance porosity and surface hydrophobicity. Comparative example 1, which did not inject carbon dioxide, resulted in an incomplete hollow structure. Comparative example 2, which omitted the PVP dissolution spraying and secondary cold water bath steps, also exhibited an incomplete hollow structure and insufficient structural stability, indicating that the carbon dioxide injection and PVP dissolution processes play a crucial role in maintaining the hollow structure. Secondly, the gel-structure modified nylon 6 is prepared by initiating the ring-opening polymerization of ε-caprolactam through aminated nano-silica and introducing sulfonic acid. Modified nanoparticles form a hydrophilic gel network. In Example 2, the highest moisture regain was achieved by controlling the proportion of nano-silica, while in Comparative Example 3, without the addition of sodium cysteine ​​sulfonic acid-carboxylate, the moisture regain dropped sharply. In Comparative Example 4, without the addition of aminated nano-silica, the ring-opening polymerization process was affected, which in turn affected the introduction of sulfonic acid groups, resulting in a significant decrease in moisture regain. This proves that the introduction of sulfonic acid groups is the core of improving moisture absorption. In addition, the hot-pressing process, through gradient pressure and temperature control, enables hollow polyester and modified nylon 6 to form interlocking gradient channels. Example 2 shows that optimizing process parameters can synergistically enhance air permeability and structural strength. In summary, this invention solves the problem of balancing air permeability and moisture absorption in traditional fiber materials through the synergistic innovation of hollow structure design, nanoparticle modification, and hot-pressing process, providing an efficient solution for the development of functional textiles.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A highly breathable, moisture-wicking, and sweat-absorbing fiber material, characterized in that, The highly breathable, moisture-wicking, and sweat-absorbing fiber material is obtained by spraying a silane coupling agent onto the surface of pre-modified hollow polyester and then hot-pressing it with gel-structured modified nylon 6. The pre-modified hollow polyester is prepared by melt-co-spinning common hydrophobic modified polyester with polyvinylpyrrolidone, injecting carbon dioxide, and then spraying an ethanol / coupling agent mixture solution through a cold water bath and atomizing it. The gel structure modified nylon 6 is prepared by adding aminated nano-silica and modified nano-silica to ε-caprolactam monomer and controlling the ratio.

2. The highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 1, characterized in that, The aminated nano-silica and modified nano-silica are prepared by reacting nano-silica with 3-aminopropylmethyldimethoxysilane to obtain aminated nano-silica, and then adding maleic anhydride, an activator and sodium cysteine ​​sulfonic acid carboxylate to obtain modified nano-silica.

3. The highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 2, characterized in that, The sodium cysteine ​​sulfonic acid carboxylate is prepared by oxidizing cysteine ​​with sodium oxide and then adjusting the pH.

4. The preparation method of the highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 1, characterized in that, The preparation steps include the following: (1) During the polymerization of polyester raw materials, when the temperature rises to 260℃, 10-30% of the total mass of polyester polyvinylpyrrolidone is added. After slurrying and stirring, carbon dioxide at 0.5-3L / min is introduced and held at this temperature for 3min. Then, it is moved to a cold water bath at 5-15℃ for 3min to cure. After that, it is atomized and sprayed with a 50℃-60℃ ethanol / coupling agent mixed solution for 2h. Finally, it is cured again in a cold water bath at 5-15℃ for 3min to obtain pre-modified hollow polyester. (2) The modified hollow polyester was prepared by atomizing and spraying the pre-modified hollow polyester with the ethanol / coupling agent mixed solution described in step (1) for 2 hours. (3) Add deionized water, 3-aminopropylmethyldimethoxysilane, and anhydrous ethanol and stir for 0.5 h to allow 3-aminopropylmethyldimethoxysilane to be fully hydrolyzed; take 20 g of nano silica and add it to a three-necked flask, then add deionized water and anhydrous ethanol, then heat and stir to disperse. After heating to 60 °C, add the prepared hydrolysate of 3-aminopropylmethyldimethoxysilane dropwise to the three-necked flask at 20 d / min; after the reaction is completed, vacuum filter, place the filter in a forced-air drying oven at 65 °C and dry for 8 h, then grind to obtain aminated nano silica; (4) Add maleic anhydride and 10g of aminated nano silica and stir to mix. Add 100mL of acidic activator as solvent and stir to react at 25-40℃ for 12-18h. Then add 20g of cysteine ​​sulfonic acid-carboxylic acid sodium salt and 100mL of phosphate buffer with pH=4.

5. Stir at room temperature for 6-8h. After the reaction is completed, centrifuge and filter with deionized water until neutral. Place the filter in a forced-air drying oven at 60℃ for 12h to obtain modified nano silica. (5) Add 5g of aminated nano silica to 100mL of diethylene glycol butyl ether / water mixed solvent containing 10g of ε-caprolactam monomer, and heat to 100-140℃ for 2h under nitrogen protection; then cool the system to 80-90℃, add 5-15g of modified nano silica, and add 100mL of 1-3% NaOH solution as a catalyst to continue the reaction for 3h; after the reaction is completed, immerse the product in 500mL of anhydrous ethanol to precipitate, wash with deionized water until neutral to remove residual solvent and catalyst, and freeze-dry at -45℃ for 24h to obtain gel-structured modified nylon 6; (6) Modified hollow polyester and gel-structured modified nylon 6 are combined together by hot pressing.

5. The preparation method of the highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 4, characterized in that, In step (1), the volume ratio of ethanol to coupling agent in the ethanol / coupling agent mixed solution is 10:3, and the coupling agent used is one of tridecafluorooctyltriethoxysilane, octadecyltrimethoxysilane, and isopropyltrititanate.

6. The preparation method of the highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 4, characterized in that, In step (3), the volume ratio of deionized water, 3-aminopropylmethyldimethoxysilane, and anhydrous ethanol is 1:1:10; the volume ratio of deionized water and anhydrous ethanol in the reaction with added nano-silica is 2:

7.

7. The preparation method of the highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 4, characterized in that, In step (4), the mass ratio of maleic anhydride and aminated nano-silica added is 3:10; the acidic activator is a combination of EDC and NHS with a molar ratio of 1:1-1.

4.

8. The preparation method of the highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 4, characterized in that, In step (4), cysteine ​​sulfonic acid-carboxylate sodium salt is obtained by mixing cysteine ​​and sodium peroxide at a mass ratio of 1:2, dissolving them in ice water at 0-5℃, stirring slowly and controlling the pH to 8-9, reacting for 2 hours to oxidize the thiol group to the sulfonic acid group, then adjusting the pH to 10-11, adding 100mL of 10%-30% NaOH solution to neutralize the carboxyl group to sodium carboxylate, and finally precipitating and purifying with 500mL of anhydrous ethanol and centrifuging to obtain cysteine ​​sulfonic acid-carboxylate sodium salt.

9. The preparation method of a highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 4, characterized in that, In step (5), the volume ratio of diethylene glycol butyl ether to water in the diethylene glycol butyl ether / water mixed solvent is 8:

2.

10. The method for preparing a highly breathable, moisture-wicking, and sweat-absorbing fiber material according to claim 4, characterized in that, In step (6), the hot pressing process involves layering modified hollow polyester and gel-structured modified nylon 6 at a volume ratio of 1:0.8-1.2, hot pressing them in a flatbed hot press at 210-230℃ and 8-16MPa pressure for 60-120s, and then holding the pressure and cooling to 50℃ or below to demold, thereby obtaining a highly breathable, moisture-wicking, and sweat-absorbing fiber material with a gradient pore structure.