Moisture-absorbing breathable polyester and chinlon composite fiber and preparation method thereof

Abstract

The invention relates to the technical field of textile fabrics, in particular to a moisture-absorption breathable polyester and chinlon composite fiber and a preparation method thereof. The invention relates to a moisture-absorbing breathable polyester and chinlon composite fiber, which is a skin-core composite fiber, takes moisture-conducting polyester fiber as a skin layer, and takes water-absorbing modified chinlon fiber as a core layer, the moisture-conducting polyester fibers are prepared from the following components in parts by weight: 68 to 75 parts of superfine denier polyester filaments, 12 to 16 parts of seaweed extract powder, 4 to 6 parts of lyocell fibers and 5 to 11 parts of a moisture-conducting auxiliary agent; the moisture conducting auxiliary agent comprises cellulose nano fibrils, nano bamboo charcoal powder and sericin. Aiming at the problem that the moisture absorption and air permeability of the existing polyester-nylon composite fiber are difficult to meet higher industrialization requirements, the moisture absorption and air permeability type polyester-nylon composite fiber with high water absorption rate, short drip diffusion time and water evaporation speed is prepared.

Description

Technical Field

[0001] This application relates to the field of textile fabric technology, and more specifically, to a moisture-wicking and breathable polyester and nylon composite fiber and its preparation method. Background Technology

[0002] With the rapid development of high technology and the continuous improvement of people's living standards, the requirements for textiles are also becoming increasingly stringent. They not only need good mechanical properties, heat resistance, and abrasion resistance, but also different functional characteristics to better meet the diverse needs of industrial applications. For example, dresses and other garments requiring a certain drape are often made with nylon elastic fabrics, but these are too tight or clingy and fail to achieve the desired drape and flow. Polyester, a relatively simple synthetic fiber, is strong, durable, elastic, and resistant to deformation. Using a polyester and nylon composite fabric gives the garment a good drape, a flattering fit, good shape retention, and a smooth feel.

[0003] Currently, although polyester-nylon composite fibers have a certain moisture absorption capacity when applied, the moisture absorption and breathability of fabrics made of nylon and polyester are relatively poor compared to other fabrics due to the structure of their raw materials. As a result, the polyester-nylon composite fibers produced cannot meet the higher industrial requirements. Therefore, it is urgent to improve the moisture absorption and breathability of polyester-nylon composite fibers by modifying the fabric structure or finishing process. Summary of the Invention

[0004] To address the issue that existing polyester-nylon composite fibers cannot meet the higher industrial requirements in terms of moisture absorption and breathability, this application provides a moisture-absorbing and breathable polyester-nylon composite fiber and its preparation method.

[0005] In a first aspect, this application provides a moisture-wicking and breathable polyester and nylon composite fiber, employing the following technical solution: a moisture-wicking and breathable polyester and nylon composite fiber, wherein the composite fiber is a core-sheath type composite fiber, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core; the composition of the moisture-wicking polyester fiber, by weight, includes 68-75 parts of polyester ultrafine denier filament, 12-16 parts of seaweed extract powder, 4-6 parts of lyocell fiber, and 5-11 parts of moisture-wicking additives; the moisture-wicking additives include cellulose nanofibers, nano bamboo charcoal powder, and sericin.

[0006] By adopting the above technical solution, seaweed extract is added to the moisture-wicking treated polyester, giving it excellent properties such as good biocompatibility, high moisture absorption, biodegradability, and high oxygen permeability. It also produces polysaccharide sulfate esters, which can reduce bacterial adhesion and have excellent antibacterial properties. The addition of lyocell fiber increases the fiber's wrinkle resistance and dimensional stability, and it has high absorption, diffusion, and evaporation efficiency for water molecules, thereby improving the fabric's moisture-wicking performance and breathability. It also improves dimensional stability, reduces wrinkling, and exhibits good performance in terms of washability and wearability. The addition of moisture-wicking agents further enhances the moisture-wicking and quick-drying properties of the polyester fiber. The combined use of cellulose nanofibers, nano-bamboo charcoal powder, and sericin in the moisture-wicking agents allows the fiber to absorb water through nanopores while maintaining high moisture-wicking efficiency.

[0007] Then, by coating and spinning moisture-wicking polyester fibers and water-absorbing modified nylon into a core-sheath composite fiber structure, a method is formed to improve the moisture absorption and breathability of the polyester-nylon composite fiber through the linkage of moisture wicking and absorption. Furthermore, sericin can also promote the bonding strength between the moisture-wicking polyester fibers and the water-absorbing modified nylon, further improving the strength of the core-spun composite fiber.

[0008] In one specific implementation, the mass ratio of the cellulose nanofibers, nano bamboo charcoal powder, and sericin is 1:(3-5):3.

[0009] By employing the above technical solution, and using a certain proportion of cellulose nanofibers, nano bamboo charcoal powder, and sericin, the porous or loosely structured fibers provide more moisture-wicking space, improving the water absorption and moisture-wicking performance of polyester fibers. Cellulose nanofibers have high hydrophilicity and a large specific surface area, improving moisture-wicking and hydrophilicity, and also enhancing the overall fiber strength and chemical stability. If the content is too low, the fiber strength will be insufficient, and the water evaporation rate will be significantly reduced. Nano bamboo charcoal powder molecules are fine and porous, and have adsorption capacity, effectively absorbing moisture and sweat. It can quickly guide moisture to cellulose nanofibers and sericin for removal, ensuring quick-drying performance. It also has properties such as eliminating odors, absorbing moisture and preventing mildew, and inhibiting bacteria. If the content is too low, the fiber water absorption rate will be slightly lower. The surface of sericin polypeptide chains has abundant polar hydrophilic groups, which can absorb excess moisture and also help the skin retain a certain amount of moisture, providing skin moisturizing function, effectively preventing direct contact between chemical fibers and the skin, and possessing certain antibacterial properties, thus improving the comfort of wearing composite fibers.

[0010] In one specific feasible embodiment, the water-absorbing modified nylon fiber is a hyperbranched modified nylon fiber; its preparation method includes, under nitrogen protection, placing trimellitic anhydride and nylon fiber at -50 to 0°C, adding an aprotic solvent, and reacting for 24 to 36 hours; heating the resulting mixture to 110 to 130°C, and reducing the pressure to maintain a vacuum of 5 to 1. -5KPa, continue the reaction for 3-8 hours, add DMF, precipitate with diethyl ether, filter, and dry to obtain the target hyperbranched polymer, which is then transported to the spinning box through a melt pipeline at a temperature of 260-270℃.

[0011] The molar mass ratio of trimellitic anhydride to nylon fiber is 1:(4-10).

[0012] One or both of the aprotic solvents dimethyl sulfoxide and carbon tetrachloride.

[0013] By adopting the above technical solution, nylon fibers and trimellitic anhydride in a certain proportion are reacted under polar solvent conditions to form nylon fibers with a certain degree of hyperbranching. The molecular branches contain a large number of polar hydrophilic groups, which improves the water absorption performance of the fibers.

[0014] In one specific implementation, the mass ratio of the moisture-wicking polyester fiber to the water-absorbing modified nylon fiber is (1.2-1.8):1.

[0015] By adopting the above technical solution, and spinning a certain proportion of moisture-wicking polyester fiber and water-absorbing modified nylon fiber together, the cohesion of the overall composite fiber can be improved, as well as the efficiency of moisture wicking and absorption, thereby increasing the fiber's water evaporation rate and water absorption rate. If the content of moisture-wicking polyester fiber is too low, it will affect the moisture diffusion efficiency.

[0016] Secondly, this application provides a method for preparing a moisture-wicking and breathable polyester and nylon composite fiber, which adopts the following technical solution: A method for preparing a moisture-wicking and breathable polyester and nylon composite fiber includes the following steps: (1) Add seaweed extract powder and lyocell fiber according to the proportion, mix at a speed of 500-600 r / min, stir for 2-4 h, then add polyester ultrafine denier filament and moisture-wicking agent, melt and mix at high speed to obtain spinning solution, then melt spin at an extrusion temperature of 260-265℃, cool, and wind moisture-wicking polyester fiber monofilament fineness of 0.5-0.55 dtex; (2) By coating spinning, moisture-wicking polyester fibers in the spinning box are coated onto water-absorbing modified nylon fibers in proportion, cooled and solidified by side air, and then placed in water at 90-100℃ for 25-45 minutes. After drying, moisture-wicking and breathable polyester and nylon composite fibers can be obtained.

[0017] The crosswind cooling solidification conditions are a temperature of 20-25℃ and a humidity of 55-58%.

[0018] In summary, this application has the following beneficial effects: 1. Polyester treated with moisture-wicking agents is infused with seaweed extract for excellent biocompatibility. Lyocell fibers are then added, which have high absorption, diffusion, and evaporation efficiency for water molecules, thus improving the fabric's moisture-wicking and breathability. This also enhances dimensional stability, reduces wrinkling, and improves washability and wearability. Moisture-wicking additives further improve the quick-drying properties of the polyester fibers. The moisture-wicking polyester fibers and water-absorbing modified nylon are then coated and spun into a core-sheath composite fiber structure, creating a method that combines moisture wicking and absorption to improve the moisture absorption and breathability of the polyester-nylon composite fiber. Furthermore, sericin further strengthens the bond between the moisture-wicking polyester fibers and the water-absorbing modified nylon, further enhancing the strength of the core-spun composite fiber.

[0019] 2. A certain proportion of cellulose nanofibers, nano bamboo charcoal powder, and sericin provides more moisture-wicking space, improving the water absorption and moisture-wicking performance of polyester fibers. Cellulose nanofibers have high hydrophilicity and a large specific surface area, improving moisture-wicking and hydrophilicity, and also improving the overall fiber strength and chemical stability. If the content is too low, the fiber strength will be insufficient, and the water evaporation rate will be significantly reduced. Nano bamboo charcoal powder molecules are dense and porous, and have adsorption capacity, absorbing moisture and sweat. It can quickly guide moisture to cellulose nanofibers and sericin for removal, ensuring quick-drying performance. It also has properties such as eliminating odors, absorbing moisture and preventing mildew, and inhibiting bacteria. If the content is too low, the fiber water absorption rate will be slightly lower. The surface of sericin polypeptide chains has abundant polar hydrophilic groups, which can absorb excess moisture and also keep the skin moisturized, effectively preventing direct contact between chemical fibers and skin. It also has certain antibacterial properties, improving the comfort of wearing composite fibers. Detailed Implementation

[0020] The present application will be further described in detail below with reference to the embodiments.

[0021] Some of the raw materials used in the preparation examples and embodiments: Fiber nanofibers: model D4234, purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.; Nano bamboo charcoal powder (3000-12000 mesh): purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.; Sericin (molecular weight 10000): purchased from Hubei Hongxin Ruiyu Fine Chemical Co., Ltd.; Polyester ultrafine denier filaments: purchased from Hangzhou Surun Fiber Co., Ltd.; Seaweed extract powder: purchased from Shandong Gushuo Biotechnology Co., Ltd.; Lyocell fiber (specification 1.33dtex 38-80mm): purchased from Wuxi Meitaisi Applied Materials Technology Co., Ltd.; Nylon fiber: nylon 6-staple fiber purchased from Hengshen Synthetic Fiber Technology Co., Ltd.

[0022] Unless otherwise specified, all raw materials used in the examples and comparative examples are commercially available products.

[0023] Preparation Example Preparation of modified nylon fibers Preparation Example 1 Under nitrogen protection, 5.8 g of trimellitic anhydride and 29 g of nylon fiber were placed at -50 °C, and 380 mL of dimethyl sulfoxide was added. The reaction was carried out for 24 h. The resulting mixture was heated to 130 °C, and the vacuum was reduced to 5 kPa. The reaction was continued for 5 h. After adding twice the amount of DMF to the reaction solution, the mixture was precipitated with diethyl ether, filtered, and dried at 60 °C to obtain the target hyperbranched polymer. The polymer was then transported to the spinning box through a melt pipe. The spinning box temperature was 260 °C, and the spinning was carried out using a spinneret at 25 °C and 60% humidity. After cooling by side air, the polymer was wound to obtain modified nylon fiber.

[0024] Preparation Example 2 Under nitrogen protection, 5.8 g of trimellitic anhydride and 29 g of nylon fiber were placed at -50 to 0 °C, and 380 mL of dimethyl sulfoxide was added. The reaction was carried out for 36 h. The resulting mixture was heated to 110 °C, and the vacuum was reduced to 5 kPa. The reaction was continued for 3 h. After adding twice the amount of DMF to the reaction solution, the mixture was precipitated with diethyl ether, filtered, and dried at 60 °C to obtain the target hyperbranched polymer. The polymer was then transported to the spinning box through a melt pipe. The spinning box temperature was 270 °C, and the spinning was carried out using a spinneret at 25 °C and 60% humidity. After cooling by side air, the polymer was wound to obtain modified nylon fiber.

[0025] Preparation Example 3 Under nitrogen protection, 5.8 g of trimellitic anhydride and 17.5 g of nylon fiber were placed at -50 °C, and 380 mL of dimethyl sulfoxide was added. The reaction was carried out for 24 h. The resulting mixture was heated to 130 °C, and the vacuum was reduced to 5 kPa. The reaction was continued for 5 h. After adding twice the amount of DMF to the reaction solution, the mixture was precipitated with diethyl ether, filtered, and dried at 60 °C to obtain the target hyperbranched polymer. The polymer was then transported to the spinning box through a melt pipe. The spinning box temperature was 260 °C, and the spinning was carried out using a spinneret at 25 °C and 60% humidity. After side cooling, the polymer was wound to obtain the modified nylon fiber.

[0026] Example 1 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:5:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0027] Example 2 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 72g of polyester ultrafine denier filament, 14g of seaweed extract powder, 6g of lyocell fiber, and 5g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:5:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixture was stirred at 500 r / min for 4 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added, and the mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 260°C, cooled, and the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, coating spinning was carried out, and the moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. Then, it was placed in water at 90°C for 45 min, removed and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0028] Example 3 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:3:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0029] Example 4 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:2:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0030] Example 5 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:5:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.2:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0031] Example 6 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:5:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0032] Example 7 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:5:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 2 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 2 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0033] Example 8 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:5:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 3 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Then, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 3 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0034] Comparative Example Comparative Example 1 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers and sericin in a mass ratio of 1:8. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0035] Comparative Example 2 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type composite fiber, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers and nano bamboo charcoal powder in a mass ratio of 4:5. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0036] Comparative Example 3 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier yarn, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additive. The moisture-wicking additive is nano-bamboo charcoal powder and sericin in a mass ratio of 5:4. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. The seaweed extract powder and lyocell fiber are added in proportion and mixed... The mixture was stirred at 600 r / min for 2 h, followed by the addition of polyester ultrafine denier filament and moisture-wicking agent. The mixture was melt-mixed at high speed to obtain a spinning solution, which was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament was wound with a fineness of 0.5 dtex. Subsequently, a coating spinning was performed, in which the moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The mixture was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. Then, it was placed in water at 100°C for 25 min, removed and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0037] Comparative Example 4 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type composite fiber, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier filament, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking agent. The moisture-wicking agent is cellulose nanofiber. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0038] Comparative Example 5 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type composite fiber, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier yarn, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additive. The moisture-wicking additive is nano-bamboo charcoal powder. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0039] Comparative Example 6 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type composite fiber, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester ultrafine denier yarn, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking agent. The moisture-wicking agent is sericin. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion, and the mixing speed was 600 r / min. The mixture was stirred for 2 h. Then, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265°C. After cooling, the moisture-wicking polyester fiber monofilament fineness was 0.5 dtex. Subsequently, the solution was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. The solution was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. The solution was then placed in water at 100°C for 25 min and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0040] Comparative Example 7 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type composite fiber, with a moisture-wicking polyester fiber as the sheath and a water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber consists of 84g of polyester microfiber, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:5:3. The mass ratio of the moisture-wicking polyester fiber to the modified nylon fiber obtained in Preparation Example 1 is 1.8:1. Lyocell fiber was added in proportion, and the mixing speed was 600 r / min. After stirring for 2 hours, polyester ultrafine denier filament and moisture-wicking agent were added. The mixture was melt-mixed at high speed to obtain a spinning solution. Then, it was melt-spun at an extrusion temperature of 265°C, cooled, and the fineness of the moisture-wicking polyester fiber monofilament was 0.5 dtex. Subsequently, it was coated and spun. The moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber obtained in Preparation Example 1 in proportion. It was cooled and solidified by side air at a temperature of 25°C and a humidity of 55%. Then, it was placed in water at 100°C for 25 minutes, taken out and dried at 60°C to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0041] Comparative Example 8 A moisture-wicking and breathable polyester and nylon composite fiber is disclosed. The composite fiber is a core-sheath type, with a moisture-wicking polyester fiber as the sheath and a nylon fiber as the core. The moisture-wicking polyester fiber consists of 68g of polyester microfiber, 16g of seaweed extract powder, 4g of lyocell fiber, and 8g of moisture-wicking additives. The moisture-wicking additives are cellulose nanofibers, nano-bamboo charcoal powder, and sericin in a mass ratio of 1:5:3. The mass ratio of the moisture-wicking polyester fiber to the nylon fiber is 1.8:1. Seaweed extract powder and lyocell fiber were added in proportion and mixed at 600 r / min for 2 hours. Then, polyester ultrafine denier filament and moisture-wicking agent were added and melt-mixed at high speed to obtain a spinning solution. The solution was then melt-spun at an extrusion temperature of 265℃, cooled, and wound with a moisture-wicking polyester fiber monofilament fineness of 0.5 dtex. Subsequently, coating spinning was performed, in which the moisture-wicking polyester fiber in the spinning box was coated onto the nylon fiber in proportion. The solution was cooled and solidified by side air at a temperature of 25℃ and a humidity of 55%. Then, it was placed in 100℃ water for 25 minutes, removed, and dried at 60℃ to obtain a moisture-wicking and breathable polyester and nylon composite fiber.

[0042] Performance testing The performance of the moisture-wicking and breathable polyester and nylon composite fibers obtained in the examples and comparative examples was tested using the following method: the composite fibers obtained in the examples and comparative examples were blended to obtain blended fabrics, and the following indicators were tested. The water absorption rate, water droplet diffusion time, and water evaporation rate of the above-mentioned blended fabrics (before washing) were tested according to GB / T21655.1-2008. The comparison results are shown in Table 1 below: Table 1 Performance Test Results As shown in Table 1, the moisture-wicking and breathable polyester and nylon composite fibers obtained in the above embodiments have high water absorption rate, short drip diffusion time and water evaporation rate, which meet the market demand for moisture-wicking and breathable fabrics.

[0043] Compared with Comparative Examples 1-6 and Examples 1 and 3-4, it can be seen that using a certain range of proportions of cellulose nanofibers, nano bamboo charcoal powder, and sericin, with its abundant pores or loose spatial structure, can provide more moisture-wicking space, thereby improving the water absorption rate and moisture-wicking performance of polyester fibers. If the content of cellulose nanofibers is too low, the fiber strength is insufficient, and the water evaporation rate is also affected. Nano bamboo charcoal powder can quickly guide water to cellulose nanofibers and sericin for removal, ensuring quick-drying performance. If the amount is too low, the fiber water absorption rate will be slightly lower. The surface of sericin polypeptide chains has abundant polar hydrophilic groups, which can absorb excess water and also keep the skin moisturized, thus improving the comfort of wearing composite fibers.

[0044] Comparing Examples 1, 5-8, and Comparative Example 8, it is evident that reacting nylon fibers and trimellitic anhydride within a certain proportion under polar solvent conditions results in nylon fibers with a certain degree of hyperbranching. The molecular branches contain a large number of polar hydrophilic groups, enhancing the fiber's water absorption performance. By co-spinning a certain proportion of moisture-wicking polyester fibers with water-absorbing modified nylon fibers, the overall cohesion of the composite fiber is improved, as well as the efficiency of moisture wicking and absorption, increasing the fiber's water evaporation rate and water absorption rate. However, excessively low moisture-wicking polyester fiber content will affect the water diffusion efficiency.

[0045] Comparative Example 1 and Comparative Example 7 show that seaweed extract has excellent properties such as good biocompatibility, high moisture absorption, biodegradability and high oxygen permeability, making the fabric soft and comfortable.

[0046] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A moisture-wicking and breathable polyester and nylon composite fiber, characterized in that: The composite fiber is a core-sheath type composite fiber, with moisture-wicking polyester fiber as the sheath and water-absorbing modified nylon fiber as the core. The moisture-wicking polyester fiber is composed of 68-75 parts by weight of polyester microfiber, 12-16 parts of seaweed extract powder, 4-6 parts of lyocell fiber, and 5-11 parts of moisture-wicking additives. The moisture-wicking additives include cellulose nanofibers, nano bamboo charcoal powder, and sericin.

2. The moisture-wicking and breathable polyester and nylon composite fiber according to claim 1, characterized in that: The mass ratio of the cellulose nanofibers, nano bamboo charcoal powder and sericin is 1:(3-5):

3.

3. The moisture-wicking and breathable polyester and nylon composite fiber according to claim 1, characterized in that: The water-absorbing modified nylon fiber is a hyperbranched modified nylon fiber. Its preparation method includes placing trimellitic anhydride and nylon fiber at -50 to 0°C under nitrogen protection, adding an aprotic solvent, and reacting for 24 to 36 hours; heating the resulting mixture to 110 to 130°C, reducing the pressure to maintain a vacuum of 5 to 8 kPa, and continuing the reaction for 3 to 8 hours; adding DMF, precipitating with diethyl ether, filtering, and drying to obtain the target hyperbranched polymer, which is then transported to a spinning box through a melt pipeline. The spinning box temperature is 260 to 270°C, and spinning, side cooling, and winding are performed to obtain the modified nylon fiber.

4. The moisture-wicking and breathable polyester and nylon composite fiber according to claim 3, characterized in that: The molar mass ratio of trimellitic anhydride to nylon fiber is 1:(4-10).

5. The moisture-wicking and breathable polyester and nylon composite fiber according to claim 3, characterized in that: One or both of the aprotic solvents dimethyl sulfoxide and carbon tetrachloride.

6. The moisture-wicking and breathable polyester and nylon composite fiber according to claim 1, characterized in that: The mass ratio of the moisture-wicking polyester fiber to the water-absorbing modified nylon fiber is (1.2-1.8):

1.

7. The method for preparing the moisture-wicking and breathable polyester and nylon composite fiber according to any one of claims 1-6, characterized in that: Includes the following steps: (1) Add seaweed extract powder and lyocell fiber according to the proportion, mix at a speed of 500-600 r / min, stir for 2-4 h, then add polyester ultrafine denier filament and moisture-wicking agent, melt and mix at high speed to obtain spinning solution, melt spin at an extrusion temperature of 260-265℃, cool, and wind moisture-wicking polyester fiber monofilament fineness of 0.5-0.55 dtex; (2) By coating spinning, moisture-wicking polyester fibers in the spinning box are coated onto water-absorbing modified nylon fibers in proportion, cooled and solidified by side air, and then placed in water at 90-100℃ for 25-45 minutes. After drying, moisture-wicking and breathable polyester and nylon composite fibers can be obtained.

8. The method for preparing the moisture-wicking and breathable polyester and nylon composite fiber according to claim 7, characterized in that: The crosswind cooling and solidification conditions are a temperature of 20-25℃ and a humidity of 55-58%.

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