Airtight flame-retardant chemical defense fabric and preparation process thereof

Abstract

The invention relates to the field of chemical protective fabrics, and particularly discloses an airtight flame-retardant chemical protective fabric and a preparation process thereof. The airtight flame-retardant chemical defense fabric sequentially comprises a PVC flame-retardant layer, an EVOH barrier layer, a composite fiber comfortable layer and a PU antibacterial inner layer from outside to inside, the raw materials of the composite fiber comfortable layer comprise special-shaped section polyester fibers and composite spandex fibers; the raw materials of the composite spandex fibers comprise modified polyurethane fibers and modified bamboo fibers. The airtight flame-retardant chemical protection fabric can be used for preparing protective clothing in a complex environment, has excellent flame-retardant chemical protection performance, is comfortable to wear, and can reduce the problems of sweat accumulation and local stuffiness caused by high-temperature operation.

Description

Technical Field

[0001] The present application relates to the field of chemical protection fabrics, and more specifically, to an airtight flame-retardant chemical protection fabric and its preparation process. Background Art

[0002] With the rapid development of modern technology and the continuous improvement of people's living standards, people's requirements for the functionality of clothing fabrics are increasing day by day. Especially for workers in industries such as firefighting, petrochemical, metallurgical casting, and electric power who are in high-temperature and chemical working environments for a long time, flame-retardant chemical protection clothing is an important layer of skin related to life safety. This layer of "skin" needs to isolate the human body from fire sources and other harmful chemical substances in a short time, playing a crucial protective role in the life safety of workers.

[0003] Regarding the above-mentioned related technologies, the inventor found that traditional flame-retardant chemical protection fabrics mostly use a single barrier layer or a simple composite structure. For example, PVC coatings or polyurethane films are used as the basic protection layer. Although they can provide a certain degree of chemical barrier and flame-retardant properties, it is difficult to balance flame-retardant persistence and material mechanical strength. Melting and dripping phenomena are likely to occur during combustion, which not only reduces the flame-retardant effect but also may cause secondary harm to users, making it difficult to meet high-standard flame-retardant requirements. Traditional flame-retardant chemical protection fabrics mostly rely on the barrier effect of a single polymer material to achieve chemical protection performance, and have a low penetration barrier ability for polar solvents, organic vapors, or strongly corrosive chemicals, and penetration is likely to occur. This results in that in extreme working environments, the fabric may not effectively isolate fire sources, high temperatures, and harmful chemical substances, but instead further increases the safety risks of workers.

[0004] In addition, traditional flame-retardant chemical protection fabrics often sacrifice the breathable and moisture-permeable properties of the fabric to achieve airtightness to block harmful substances, which leads to problems such as stuffiness and sweat accumulation for wearers after long-term work, seriously affecting wearing comfort and work efficiency. At the same time, the lack of effective antibacterial treatment also makes the fabric likely to breed bacteria during long-term wear, causing skin problems or hygiene risks, especially in high-intensity work scenarios. Summary of the Invention

[0005] In order to improve the flame-retardant and chemical protection performance of flame-retardant chemical protection fabrics, while enhancing the comfort and antibacterial properties of the fabric and reducing the stuffiness and sweat accumulation during high-temperature work, the present application provides an airtight flame-retardant chemical protection fabric and its preparation process.

[0006] In the first aspect, the present application provides an airtight flame-retardant chemical protection fabric, adopting the following technical solution: An airtight flame-retardant chemical protection fabric successively includes a PVC flame-retardant layer, an EVOH barrier layer, a composite fiber comfort layer, and a PU antibacterial inner layer from outside to inside; The raw materials of the composite fiber comfort layer include profiled-section polyester fibers and composite spandex fibers; The raw materials of the composite spandex fibers include modified polyurethane fibers and modified bamboo fibers.

[0007] By adopting the above technical solution, using the PVC flame-retardant layer as the outermost layer provides the first layer of flame-retardant protection for the fabric. The EVOH barrier layer has high airtightness and can effectively block the penetration of chemical substances, providing the fabric with chemical protection performance.

[0008] The composite spandex fibers prepared from modified polyurethane fibers and modified bamboo fibers have excellent water absorption and flexibility, can timely absorb the sweat of the wearer, and keep the skin dry. The composite fiber comfort layer prepared by compounding profiled-section polyester fibers and composite spandex fibers, on the one hand, can serve as a skeleton layer to provide excellent support strength and flexibility for the fabric, facilitating the movement of the wearer when wearing. Further, the inventor found that the profiled-section polyester fibers and composite spandex fibers are compounded in the fabric to form a water absorption and water conduction network. When the wearer sweats at high temperature, the comfort layer can timely absorb the sweat and guide the moisture to diffuse in different directions in the fabric. Compared with traditional fabrics, the comfort layer of the present application realizes the dual effects of moisture absorption and moisture conduction drive, can form a water storage buffer layer, effectively prevent the concentrated penetration of sweat and accumulation on the skin surface, resulting in discomfort caused by excessive local skin heat and reduce the sticky feeling.

[0009] The PU antibacterial inner layer contacts the skin, inhibits the growth of microorganisms through antibacterial agents, and endows the fabric with good antibacterial performance, further ensuring the wearing comfort of the fabric.

[0010] The design of the multi-layer structure synergistically plays multiple roles such as flame retardancy, chemical protection, comfort and antibacterial, and can meet the requirements of personnel protection for airtight flame-retardant and chemical-protective fabrics in complex environments.

[0011] Optionally, the raw materials of the modified bamboo fibers include bamboo pulp fibers and acrylamide-acrylonitrile-acrylic acid terpolymer with a mass ratio of (4-6):1.

[0012] By adopting the above technical solution, the modified bamboo fibers are based on natural bamboo pulp fibers, endowing the fibers with the basis of moisture absorption and antibacterial properties. The acrylamide-acrylonitrile-acrylic acid terpolymer is a superabsorbent resin and has good salt tolerance. On the one hand, it can endow the composite fiber comfort layer with excellent moisture absorption. When the wearer sweats a lot at high temperature, the comfort layer can timely absorb the sweat. Even if it is affected by the airtightness of the fabric and cannot timely discharge the moisture from the fabric, it can also absorb a large amount of water to store the sweat and form a water storage buffer layer to prevent the sweat from re-seeping and causing a greater burden on the wearer.

[0013] Furthermore, the inventors found that the acrylamide-acrylonitrile-acrylic acid terpolymer can further enhance the flame retardant and heat insulation performance of the fabric. The acrylamide-acrylonitrile-acrylic acid terpolymer has a large heat capacity at high temperatures, can absorb a large amount of heat, form an effective isolation between the human body and external heat sources, reduce the perceived temperature, and protect the safety of personnel in a fire with a large fire.

[0014] The composite fiber comfort layer forms a gradient sweat absorption system through the rapid moisture conduction of profiled cross-section polyester fibers, the temporary water storage of modified polyurethane fibers, and the deep water locking of modified bamboo fibers, effectively realizing the sweat absorption, water storage and buffering of the fabric under the condition of good flame retardant, chemical protection and airtightness, while isolating external heat sources, reducing the accumulation of sweat and local stuffiness, and ensuring the comfort of wearing the fabric.

[0015] Optionally, the raw materials of the modified polyurethane fiber, by weight, include 38-43 parts of polyester polyol, 20-23 parts of aliphatic isocyanate, 2-6 parts of hydrophilic molecular chain extender, and 0.1-0.2 parts of dibutyltin dilaurate.

[0016] Optionally, the aliphatic isocyanate is selected from any one of hexamethylene diisocyanate, 4,4-dicyclohexylmethane diisocyanate, isophorone diisocyanate, and cyclohexane dimethylene diisocyanate.

[0017] Optionally, the hydrophilic molecular chain extender is selected from any one of dimethylolpropionic acid, dimethylolbutyric acid, sodium 2-aminoethanesulfonate, and triethanolamine.

[0018] By adopting the above technical solutions, both polyester polyol and aliphatic isocyanate have excellent chemical stability, providing excellent flexibility for the modified polyurethane fiber. The use of hydrophilic molecular chain extenders effectively enhances the sweat absorption ability of spandex, further improving the comfort of the fabric.

[0019] Optionally, the raw materials of the PU antibacterial inner layer, by weight, include 35-45 parts of anionic aliphatic waterborne PU, 1.5-2.5 parts of cationic antibacterial agent, 5-8 parts of temperature-regulating PCM phase change microcapsules, 0.05-0.1 part of dispersant, and 0.1-0.2 part of thickener.

[0020] Optionally, the dispersant is BYK-154.

[0021] Optionally, the thickener is hydroxyethyl cellulose.

[0022] By adopting the above technical solutions, the anionic aliphatic waterborne PU resin has excellent film-forming properties and can form good adhesion with the composite fiber comfort layer. The cationic antibacterial agent can enhance the compatibility and stability between the antibacterial agent and the inner matrix through electrostatic bonding with the anionic aliphatic waterborne PU resin matrix. The use of the temperature-regulating PCM phase change microcapsules in the inner layer can absorb the excess heat on the body surface, cooperate with the acrylamide-acrylonitrile-acrylic acid terpolymer in the composite fiber comfort layer, maintain the body surface temperature in a high-temperature environment, reduce the generation, accumulation and stuffiness of sweat, thereby improving the wearing comfort of the fabric.

[0023] Optionally, the cationic antibacterial agent is selected from any one or a combination of two of nano silver and chitosan quaternary ammonium salt.

[0024] Optionally, the raw materials of the PVC layer include aluminum hydroxide and PVC resin with a mass ratio of 1:(4-6).

[0025] Optionally, the EVOH barrier layer sequentially includes a first PE layer, a first TIE layer, a first copolymerized PA layer, an EVOH barrier layer, a second copolymerized PA layer, a second TIE layer, and a second PE layer from the outside to the inside.

[0026] In a second aspect, the present application provides a preparation process for an airtight flame-retardant chemical-resistant fabric, adopting the following technical solutions: A preparation process for an airtight flame-retardant chemical-resistant fabric includes the following steps: S1: Prepare the composite fiber comfort layer: (1) Using modified bamboo fiber as the core yarn and modified polyurethane fiber as the outer wrapping yarn, twisting them according to a strand ratio of 1:(2.5-3.5), and performing ring spinning to obtain composite spandex fiber; (2) Using profiled cross-section polyester fiber as the warp and composite spandex fiber as the weft, weaving according to a warp density of 360-380 threads / 10 cm and a weft density of 200-220 threads / 10 cm to obtain the composite fiber comfort layer; S2: Sequentially compound the PVC flame-retardant layer with the EVOH barrier layer and the composite fiber comfort layer to obtain a preliminary fabric; S3: According to the raw material ratio, ultrasonically mix anionic aliphatic waterborne PU, cationic antibacterial agent, temperature-regulating PCM phase change microcapsules, dispersant, and thickener evenly, and roll-coat them on the side of the composite fiber comfort layer of the preliminary fabric away from the EVOH barrier layer, and cure to form a PU antibacterial inner layer, thus obtaining the fabric.

[0027] By adopting the above technical solution, after preparing the composite spandex fiber with modified bamboo fiber as the core yarn and modified polyurethane fiber as the outer wrapping yarn, using profiled cross-section polyester fiber as the warp and composite spandex fiber as the weft, it can endow the fabric with excellent flexibility and mechanical properties, ensure the wearer's movement flexibility, improve work efficiency. When preparing the composite fiber comfort layer under the warp and weft density of this application, a gradient sweat-absorbing system is formed, and the fabric formed by the composite fiber comfort layer can achieve rapid moisture conduction and water storage buffering while having good flame retardant, chemical protection and airtightness, and at the same time isolate external heat sources, effectively reducing the accumulation of sweat and local stuffiness. While ensuring that the fabric has high flame retardant and chemical protection performance, it also ensures the wearing comfort of the fabric.

[0028] Optionally, the preparation method of the modified bamboo fiber includes the following steps: Soak the bamboo pulp fiber in the H2O2 solution, adjust the pH to (9±0.5), heat and stir at 60 - 70 °C for 35 - 45 min, wash and dry to obtain the pretreated bamboo pulp fiber; Dissolve the pretreated bamboo pulp fiber in the ionic solution according to the material-liquid ratio of 1:(8 - 11), heat and stir evenly, add the acrylamide-acrylonitrile-acrylic acid terpolymer, adjust the pH to 7 - 8, add N,N'-methylenebisacrylamide after ultrasonic dispersion, and stir to form a homogeneous spinning solution; Age the spinning solution, and then obtain the modified bamboo fiber through dry spinning.

[0029] Optionally, the preparation method of the modified polyurethane fiber includes the following steps: Mix the polyester polyol and aliphatic isocyanate, heat and stir in an inert gas atmosphere at 80 - 100 °C, cool down to 60 - 70 °C, add the hydrophilic molecular chain extender and dibutyltin dilaurate, and continue to stir until the reaction is complete to obtain the polyurethane stock solution; Pour the polyurethane stock solution into deionized water and stir to form a spinning solution, age it, and then obtain it through dry spinning.

[0030] In summary, this application has the following beneficial effects: 1. Since the present application uses a PVC flame-retardant layer and an EVOH barrier layer as the outer layer, the fabric has high airtightness, and at the same time provides excellent flame-retardant and chemical protection performance for the fabric, which can effectively isolate the penetration of chemical substances. Modified bamboo fiber is used as the core yarn, and modified polyurethane fiber is used as the outer wrapping yarn to prepare composite spandex fiber and then used as the weft, and profiled cross-section polyester fiber is used as the warp to prepare the composite fiber comfort layer, endowing the fabric with good flexibility, which can facilitate the movement flexibility of the wearer during operation. Further, a gradient sweat-absorbing system is formed inside the composite fiber comfort layer, which can timely adsorb sweat and diffuse and store it inside the composite fiber comfort layer to form a dual-effect drive of moisture absorption and moisture conduction, effectively preventing sweat from accumulating on the skin surface or in local fabric, resulting in stuffiness, discomfort and greasiness, and significantly improving the wearing comfort of the fabric.

[0031] 2. In the modified bamboo fiber of the present application, acrylamide-acrylonitrile-acrylic acid terpolymer is added. Even if it is affected by the airtightness of the fabric outer layer and cannot timely discharge the moisture from the fabric, it can absorb a large amount of water to store sweat to form a water storage buffer layer, and at the same time can absorb a large amount of heat, forming an effective isolation between the human body and the external heat source, reducing the body feeling temperature, preventing the reverse penetration of sweat and causing a large burden on the wearer, and significantly improving the thermal protection performance and wearing comfort of the fabric.

[0032] 3. In the PU antibacterial inner layer of the present application, temperature-regulating PCM phase change microcapsules are added, which can effectively absorb the excess heat on the skin surface, cooperate with the acrylamide-acrylonitrile-acrylic acid terpolymer in the composite fiber comfort layer, maintain the body surface temperature in a high-temperature environment, reduce the generation, accumulation and stuffiness of sweat, improve the wearing comfort, and ensure the safety of the wearer in a large-fire fire field or an extremely high-temperature working environment. Detailed implementation manners

[0033] The following examples further illustrate the present application in detail. Raw materials

[0034] Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are all commercially available products, specifically: Profiled cross-section polyester fiber, with a cross-section of cruciform, and the specification is 75D / 36F; Bamboo pulp fiber, with an average diameter of 50μm and an average length of 2mm; Acrylamide-acrylonitrile-acrylic acid terpolymer, with a CAS of 26982-19-4; Polyethylene adipate, selected from Hubei Wande Chemical Co., Ltd., WD10132; Hexamethylene diisocyanate, selected from Shanghai Fuzhe Chemical Co., Ltd., with a CAS of 822-06-0; Anionic aliphatic waterborne PU, which is PU-32020; Nano silver, selected from Huizhou Mingkai Antimildew and Antibacterial Technology Co., Ltd., Micro-KF228; Quaternary ammonium salt of chitosan, selected from Shandong Weikang Biomedical Technology Co., Ltd., quaternary ammonium salt of chitosan 01; Temperature-regulating PCM phase change microcapsule, selected from PCMFOCUS PF-02; PE-g-MAH, selected from Jin Yunlai Plastics in Zhangmutou, Dongguan, TY1060H; Ethylene-acrylate-maleic anhydride terpolymer, selected from Lotader® 4720; Copolymerized PA, selected from BASF, C3U copolymerized PA66; EVOH, selected from Kuraray of Japan, EVAL™F; Calcium-zinc stabilizer, selected from Chongqing Baohua Chemical Auxiliary Factory, XJ-169ⅠT; Dispersant, selected from BYK, BYK-154; Thickener, which is hydroxyethyl cellulose, selected from Wuxi Henderson Chemical Products Co., Ltd., HHBR250. Preparation example of composite spandex fiber

[0035] Preparation example 1 Composite spandex fiber, the raw materials include modified polyurethane fiber and modified bamboo fiber, and its preparation method includes the following steps: S1: Modified bamboo fiber, the raw materials include bamboo pulp fiber and acrylamide-acrylonitrile-acrylic acid terpolymer with a mass ratio of 5.2:1, and its preparation method is: (1) Immerse the bamboo pulp fiber in 3wt% H2O2 solution, adjust the pH to (9±0.5), heat and stir at 70°C for 40 min, wash and dry to obtain pretreated bamboo pulp fiber; (2) Dissolve the pretreated bamboo pulp fiber in 1-allyl-3-methylimidazolium chloride solution according to the solid-liquid ratio of 1:9, heat and stir evenly, then add acrylamide-acrylonitrile-acrylic acid terpolymer, adjust the pH to 7, ultrasonically disperse for 15 min, and then add 0.2wt% N,N'-methylenebisacrylamide and 0.05wt% ammonium persulfate, and stir to form a homogeneous spinning solution; (3) Cure the spinning solution, and then obtain the modified bamboo fiber by dry spinning; S2: Modified polyurethane fiber, the raw materials include 38 parts by weight of polyester polyol, 22 parts by weight of aliphatic isocyanate, 4 parts by weight of hydrophilic molecular chain extender, and 0.1 part by weight of dibutyltin dilaurate. The polyester polyol is polyethylene adipate, the aliphatic isocyanate is hexamethylene diisocyanate, and the hydrophilic molecular chain extender is dimethylolpropionic acid. Its preparation method is as follows: (1) Mix the polyester polyol and the aliphatic isocyanate, heat and stir at 80 °C under the N2 gas atmosphere for 2 h, cool down to 60 °C, add the hydrophilic molecular chain extender and dibutyltin dilaurate, and continue stirring until the reaction is complete to obtain the polyurethane stock solution; (2) Pour the polyurethane stock solution into deionized water according to the material-liquid ratio of 1:3.5 and stir. Stir at a speed of 8000 rmp in a high-speed stirrer for 1.5 h to form a spinning solution, carry out aging, and then through dry spinning to obtain the modified polyurethane fiber; S3: Using the modified bamboo fiber as the core yarn and the modified polyurethane fiber as the outer wrapping yarn, carry out parallel twisting according to the strand ratio of 1:3.2, and carry out ring spinning to prepare the composite spandex fiber with a core-sheath structure.

[0036] Preparation Example 2 Composite spandex fiber, the raw materials include modified polyurethane fiber and modified bamboo fiber. Its preparation method includes the following steps: S1: Modified bamboo fiber, the raw materials include bamboo pulp fiber and acrylamide-acrylonitrile-acrylic acid terpolymer with a mass ratio of 4:1. Its preparation method is as follows: (1) Immerse the bamboo pulp fiber in a 3 wt% H2O2 solution, adjust the pH to (9 ± 0.5), heat and stir at 65 °C for 40 min, wash and dry to obtain the pretreated bamboo pulp fiber; (2) Dissolve the pretreated bamboo pulp fiber in 1-allyl-3-methylimidazolium chloride solution according to the material-liquid ratio of 1:8, heat and stir evenly, then add acrylamide-acrylonitrile-acrylic acid terpolymer, adjust the pH to 8, ultrasonically disperse for 15 min, and then add 0.2 wt% N,N'-methylenebisacrylamide and 0.05 wt% ammonium persulfate, and stir to form a homogeneous spinning solution; (3) Carry out aging on the spinning solution, and then obtain the modified bamboo fiber through dry spinning; S2: Modified polyurethane fiber, the raw materials include 40 parts by weight of polyester polyol, 20 parts by weight of aliphatic isocyanate, 2 parts by weight of hydrophilic molecular chain extender, and 0.15 part by weight of dibutyltin dilaurate. The polyester polyol is polyethylene adipate, the aliphatic isocyanate is hexamethylene diisocyanate, and the hydrophilic molecular chain extender is dimethylolpropionic acid. Its preparation method is as follows: (1) Mix the polyester-based polyol and the aliphatic isocyanate, heat and stir at 100 °C under a nitrogen gas atmosphere for 2 h, cool down to 70 °C, add the hydrophilic molecular chain extender and dibutyltin dilaurate, and continue stirring until the reaction is complete to obtain the polyurethane stock solution; (2) Pour the polyurethane stock solution into deionized water according to a material-liquid ratio of 1:3.5 and stir. Stir for 1.5 h at a rotation speed of 8000 rmp in a high-speed stirrer to form a spinning solution, carry out aging, and then perform dry spinning to obtain the modified polyurethane fiber; S3: Use the modified bamboo fiber as the core yarn and the modified polyurethane fiber as the outer wrapping yarn, carry out parallel twisting according to a strand ratio of 1:3, and perform ring spinning to produce the core-spun composite spandex fiber.

[0037] Preparation Example 3 Composite spandex fiber, the raw materials include modified polyurethane fiber and modified bamboo fiber, and its preparation method includes the following steps: S1: Modified bamboo fiber, the raw materials include bamboo pulp fiber and acrylamide-acrylonitrile-acrylic acid terpolymer with a mass ratio of 4.7:1, and its preparation method is: (1) Immerse the bamboo pulp fiber in a 3 wt% H2O2 solution, adjust the pH to (9 ± 0.5), heat and stir at 70 °C for 35 min, wash and dry to obtain the pretreated bamboo pulp fiber; (2) Dissolve the pretreated bamboo pulp fiber in 1-allyl-3-methylimidazolium chloride solution according to a material-liquid ratio of 1:11, heat and stir evenly, then add the acrylamide-acrylonitrile-acrylic acid terpolymer, adjust the pH to 8, ultrasonically disperse for 15 min, and then add 0.2 wt% N,N'-methylenebisacrylamide and 0.05 wt% ammonium persulfate, and stir to form a homogeneous spinning solution; (3) Carry out aging on the spinning solution, and then obtain the modified bamboo fiber through dry spinning; S2: Modified polyurethane fiber, the raw materials include 41 parts by weight of polyester-based polyol, 21 parts by weight of aliphatic isocyanate, 5 parts by weight of hydrophilic molecular chain extender and 0.15 parts by weight of dibutyltin dilaurate. The polyester-based polyol is polyethylene adipate, the aliphatic isocyanate is hexamethylene diisocyanate, and the hydrophilic molecular chain extender is dimethylolpropionic acid. Its preparation method is: (1) Mix the polyester-based polyol and the aliphatic isocyanate, heat and stir at 80 °C under a nitrogen gas atmosphere for 2 h, cool down to 70 °C, add the hydrophilic molecular chain extender and dibutyltin dilaurate, and continue stirring until the reaction is complete to obtain the polyurethane stock solution; (2) Pour the polyurethane stock solution into deionized water according to a material-liquid ratio of 1:3.5 and stir. Stir for 1.5 h at a rotation speed of 8000 rmp in a high-speed stirrer to form a spinning solution, carry out aging, and then perform dry spinning to obtain the modified polyurethane fiber; S3: Using the modified bamboo fiber as the core yarn and the modified polyurethane fiber as the outer wrapping yarn, twist them together according to a strand ratio of 1:2.5, and perform ring spinning to obtain a composite spandex fiber with a core-sheath structure.

[0038] Preparation Example 4 Composite spandex fiber, the raw materials include modified polyurethane fiber and modified bamboo fiber, and its preparation method includes the following steps: S1: The modified bamboo fiber, the raw materials include bamboo pulp fiber and acrylamide-acrylonitrile-acrylic acid terpolymer with a mass ratio of 6:1, and its preparation method is: (1) Immerse the bamboo pulp fiber in a 3wt% H2O2 solution, adjust the pH to (9±0.5), heat and stir at 40°C for 45 minutes, wash and dry to obtain pretreated bamboo pulp fiber; (2) Dissolve the pretreated bamboo pulp fiber in 1-allyl-3-methylimidazolium chloride solution according to a solid-liquid ratio of 1:10, heat and stir evenly, then add acrylamide-acrylonitrile-acrylic acid terpolymer, adjust the pH to 7, ultrasonically disperse for 15 minutes, and then add 0.2wt% N,N'-methylenebisacrylamide and 0.05wt% ammonium persulfate, and stir to form a homogeneous spinning solution; (3) Age the spinning solution, and then obtain the modified bamboo fiber by dry spinning; S2: The modified polyurethane fiber, the raw materials include 43 parts by weight of polyester polyol, 23 parts by weight of aliphatic isocyanate, 6 parts by weight of hydrophilic molecular chain extender and 0.2 parts by weight of dibutyltin dilaurate, wherein the polyester polyol is polyethylene adipate, the aliphatic isocyanate is hexamethylene diisocyanate, and the hydrophilic molecular chain extender is dimethylolpropionic acid, and its preparation method is: (1) Mix the polyester polyol and the aliphatic isocyanate, heat and stir at 90°C in an N2 gas atmosphere for 2 hours, cool down to 70°C, add the hydrophilic molecular chain extender and dibutyltin dilaurate, and continue stirring until the reaction is complete to obtain a polyurethane stock solution; (2) Pour the polyurethane stock solution into deionized water according to a solid-liquid ratio of 1:3.5 and stir, stir at a speed of 8000 rmp in a high-speed stirrer for 1.5 hours to form a spinning solution, age it, and then obtain the modified polyurethane fiber through dry spinning; S3: Using the modified bamboo fiber as the core yarn and the modified polyurethane fiber as the outer wrapping yarn, twist them together according to a strand ratio of 1:3.5, and perform ring spinning to obtain a composite spandex fiber with a core-sheath structure.

[0039] Preparation Example 5 The composite spandex fiber, different from Preparation Example 1, is that the modified bamboo fiber does not contain acrylamide-acrylonitrile-acrylic acid terpolymer, and the preparation method of the modified bamboo fiber is: (1) Immerse bamboo pulp fibers in a 3 wt% H2O2 solution, adjust the pH to (9 ± 0.5), heat and stir at 70 °C for 40 min, wash and dry to obtain pretreated bamboo pulp fibers; (2) Dissolve the pretreated bamboo pulp fibers in 1-allyl-3-methylimidazolium chloride solution at a material-liquid ratio of 1:9. After heating and stirring evenly, add 0.2 wt% N,N'-methylenebisacrylamide and 0.05 wt% ammonium persulfate, and stir to form a spinning solution; (3) Age the spinning solution, and then obtain modified bamboo fibers by dry spinning; All other steps are the same as those in Preparation Example 1. Example Example 1

[0040] An airtight flame-retardant and chemical-resistant fabric, which sequentially includes a PVC flame-retardant layer, an EVOH barrier layer, a composite fiber comfort layer, and a PU antibacterial inner layer from outside to inside. Its preparation method includes the following steps: S1: Preparation of the PVC flame-retardant layer: Mix 4 parts by weight of PVC resin, 1 part by weight of aluminum hydroxide, 0.5 part by weight of dioctyl phthalate, and 0.1 part by weight of calcium-zinc stabilizer evenly, and then obtain the PVC flame-retardant layer through pre-plasticization, internal mixing and plasticization, calendering, cooling, and cutting; S2: Preparation of the EVOH barrier layer: Use a multi-layer co-extrusion device to add aluminum hydroxide and PE-g-MAH with a mass ratio of 1:5, ethylene-acrylate-maleic anhydride terpolymer, copolymerized PA, EVOH, copolymerized PA, ethylene-acrylate-maleic anhydride terpolymer, aluminum hydroxide and PE-g-MAH with a mass ratio of 1:5 into seven barrels respectively, conduct melt co-extrusion, blow molding and cooling and shaping to obtain an EVOH barrier layer that sequentially includes a first PE layer, a first TIE layer, a first copolymerized PA layer, an EVOH barrier layer, a second copolymerized PA layer, a second TIE layer, and a second PE layer from outside to inside; S3: Preparation of the composite fiber comfort layer: Use profiled cross-section polyester fibers as warp yarns and the composite spandex fibers obtained in Preparation Example 1 as weft yarns, and weave according to a warp density of 360 threads / 10 cm and a weft density of 210 threads / 10 cm to obtain the composite fiber comfort layer; S4: Bond and compound the PVC flame-retardant layer and the EVOH barrier layer, and the EVOH barrier layer and the composite fiber comfort layer by roller-coating PUR hot melt adhesive, and cure to form a preliminary fabric that sequentially includes a PVC flame-retardant layer, an EVOH barrier layer, and a composite fiber comfort layer from outside to inside; S5: According to the raw material ratio, 35 parts by weight of anionic aliphatic waterborne PU, 2 parts by weight of nano silver, 5 parts by weight of temperature-regulating PCM phase change microcapsule, 0.05 part by weight of dispersant and 0.1 part by weight of thickener are ultrasonically mixed evenly, and roll-coated on the side of the composite fiber comfort layer of the preliminary fabric away from the EVOH barrier layer, and after curing, a PU antibacterial inner layer is formed, thus obtaining. Example 2

[0041] An airtight flame-retardant chemical-proof fabric, which sequentially includes a PVC flame-retardant layer, an EVOH barrier layer, a composite fiber comfort layer and a PU antibacterial inner layer from outside to inside. Its preparation method includes the following steps: S1: Preparation of the PVC flame-retardant layer: 5 parts by weight of PVC resin, 1 part by weight of aluminum hydroxide, 0.5 part by weight of dioctyl phthalate and 0.1 part by weight of calcium-zinc stabilizer are mixed evenly, and after pre-plasticization, internal mixer plasticization, calendering, cooling and cutting, the PVC flame-retardant layer is obtained; S2: Preparation of the EVOH barrier layer: Using a multi-layer co-extrusion device, aluminum hydroxide and PE-g-MAH with a mass ratio of 1:5, ethylene-acrylate-maleic anhydride terpolymer, copolymerized PA, EVOH, copolymerized PA, ethylene-acrylate-maleic anhydride terpolymer, aluminum hydroxide and PE-g-MAH with a mass ratio of 1:5 are respectively added into seven barrels, and after melt co-extrusion and blow molding into a film and then cooling and shaping, an EVOH barrier layer is obtained which sequentially includes a first PE layer, a first TIE layer, a first copolymerized PA layer, an EVOH barrier layer, a second copolymerized PA layer, a second TIE layer and a second PE layer from outside to inside; S3: Preparation of the composite fiber comfort layer: Using profiled-section polyester fiber as the warp and the composite spandex fiber obtained in Preparation Example 2 as the weft, weaving is carried out according to a warp density of 380 threads / 10 cm and a weft density of 220 threads / 10 cm to obtain the composite fiber comfort layer; S4: Between the PVC flame-retardant layer and the EVOH barrier layer, and between the EVOH barrier layer and the composite fiber comfort layer, they are bonded and compounded by roll-coating PUR hot melt adhesive and cured to form a preliminary fabric which is sequentially the PVC flame-retardant layer, the EVOH barrier layer and the composite fiber comfort layer from outside to inside; S5: According to the raw material ratio, 43 parts by weight of anionic aliphatic waterborne PU, 1.5 parts by weight of nano silver, 6 parts by weight of temperature-regulating PCM phase change microcapsule, 0.07 part by weight of dispersant and 0.15 part by weight of thickener are ultrasonically mixed evenly, and roll-coated on the side of the composite fiber comfort layer of the preliminary fabric away from the EVOH barrier layer, and after curing, a PU antibacterial inner layer is formed, thus obtaining. Example 3

[0042] An airtight flame-retardant chemical-resistant fabric, which sequentially includes a PVC flame-retardant layer, an EVOH barrier layer, a composite fiber comfort layer, and a PU antibacterial inner layer from outside to inside. Its preparation method includes the following steps: S1: Preparation of the PVC flame-retardant layer: Mix 5 parts by weight of PVC resin, 1 part by weight of aluminum hydroxide, 0.5 part by weight of dioctyl phthalate, and 0.1 part by weight of calcium-zinc stabilizer evenly, and then obtain the PVC flame-retardant layer through pre-plasticization, intensive plasticization, calendering, cooling, and cutting; S2: Preparation of the EVOH barrier layer: Use a multi-layer co-extrusion device to add aluminum hydroxide and PE-g-MAH with a mass ratio of 1:5, ethylene-acrylate-maleic anhydride terpolymer, copolyamide PA, EVOH, copolyamide PA, ethylene-acrylate-maleic anhydride terpolymer, aluminum hydroxide and PE-g-MAH with a mass ratio of 1:5 into seven barrels respectively, conduct melt co-extrusion, blow molding and film formation, and then cool and shape to obtain an EVOH barrier layer that sequentially includes a first PE layer, a first TIE layer, a first copolyamide PA layer, an EVOH barrier layer, a second copolyamide PA layer, a second TIE layer, and a second PE layer from outside to inside; S3: Preparation of the composite fiber comfort layer: Use profiled cross-section polyester fiber as the warp and the composite spandex fiber obtained in Preparation Example 3 as the weft, and carry out weaving according to a warp density of 370 per 10 cm and a weft density of 200 per 10 cm to obtain the composite fiber comfort layer; S4: Bond and compound the PVC flame-retardant layer and the EVOH barrier layer, and the EVOH barrier layer and the composite fiber comfort layer by roll-coating PUR hot melt adhesive, and form a preliminary fabric that sequentially includes a PVC flame-retardant layer, an EVOH barrier layer, and a composite fiber comfort layer from outside to inside after curing; S5: According to the raw material ratio, ultrasonically mix 38 parts by weight of anionic aliphatic waterborne PU, 2 parts by weight of chitosan quaternary ammonium salt, 7 parts by weight of temperature-regulating PCM phase change microcapsules, 0.07 part by weight of dispersant, and 0.17 part by weight of thickener evenly, and roll-coat it on the side of the composite fiber comfort layer of the preliminary fabric away from the EVOH barrier layer, and form a PU antibacterial inner layer after curing, thus obtaining the product. Example 4

[0043] An airtight flame-retardant chemical-resistant fabric, which sequentially includes a PVC flame-retardant layer, an EVOH barrier layer, a composite fiber comfort layer, and a PU antibacterial inner layer from outside to inside. Its preparation method includes the following steps: S1: Preparation of the PVC flame-retardant layer: Mix 6 parts by weight of PVC resin, 1 part by weight of aluminum hydroxide, 0.5 part by weight of dioctyl phthalate, and 0.1 part by weight of calcium-zinc stabilizer evenly, and then obtain the PVC flame-retardant layer through pre-plasticization, intensive plasticization, calendering, cooling, and cutting; S2: Preparation of EVOH barrier layer: Using a multi-layer co-extrusion device, add aluminum hydroxide and PE-g-MAH with a mass ratio of 1:5, ethylene-acrylate-maleic anhydride terpolymer, copolyamide PA, EVOH, copolyamide PA, ethylene-acrylate-maleic anhydride terpolymer, aluminum hydroxide and PE-g-MAH with a mass ratio of 1:5 into seven barrels respectively, conduct melt co-extrusion, blow molding and cooling and shaping to obtain an EVOH barrier layer including a first PE layer, a first TIE layer, a first copolyamide PA layer, an EVOH barrier layer, a second copolyamide PA layer, a second TIE layer and a second PE layer from outside to inside; S3: Preparation of composite fiber comfort layer: Use profiled cross-section polyester fiber as the warp and the composite spandex fiber obtained in Preparation Example 4 as the weft, and conduct weaving according to a warp density of 360 threads / 10 cm and a weft density of 200 threads / 10 cm to obtain a composite fiber comfort layer; S4: Bond and composite the PVC flame-retardant layer and the EVOH barrier layer, and the EVOH barrier layer and the composite fiber comfort layer by roll-coating PUR hot melt adhesive, and form a preliminary fabric including a PVC flame-retardant layer, an EVOH barrier layer and a composite fiber comfort layer from outside to inside after curing; S5: According to the raw material ratio, ultrasonically mix 45 parts by weight of anionic aliphatic waterborne PU, 2.5 parts by weight of chitosan quaternary ammonium salt, 8 parts by weight of temperature-regulating PCM phase change microcapsules, 0.1 part by weight of dispersant and 0.2 part by weight of thickener evenly, roll-coat it on the side of the composite fiber comfort layer of the preliminary fabric away from the EVOH barrier layer, and form a PU antibacterial inner layer after curing, thus obtaining. Example 5

[0044] An airtight flame-retardant and chemical-resistant fabric, different from Example 1 in that the composite spandex fiber used in step S3 is obtained from Preparation Example 5, and other steps are the same as those in Example 1. Example 6

[0045] An airtight flame-retardant and chemical-resistant fabric, different from Example 1 in that 2 parts by weight of nano silver in step S5 is replaced by 2 parts by weight of a mixture of nano silver and chitosan quaternary ammonium salt with a mass ratio of 1:1, and other steps are the same as those in Example 1. Comparative example

[0046] Comparative example 1 An airtight flame-retardant and chemical-resistant fabric, different from Example 1 in that no composite spandex fiber is added to the composite fiber comfort layer in step S3, and its preparation method is specifically: Use profiled cross-section polyester fiber as the warp and weft, and conduct weaving according to a warp density of 360 threads / 10 cm and a weft density of 210 threads / 10 cm to obtain a composite fiber comfort layer; Other steps are the same as those in Example 1.

[0047] Comparative Example 2 An airtight flame-retardant chemical protective fabric, which is different from that in Example 1 in that no modified bamboo fiber is added to the composite fiber comfort layer in step S3. The specific preparation method is as follows: Taking profiled-section polyester fibers as the warp and the yarn obtained by ring spinning the modified polyurethane fibers obtained in step S2 of Preparation Example 1 as the weft, weaving is carried out according to a warp density of 360 per 10 cm and a weft density of 210 per 10 cm to obtain a composite fiber comfort layer; Other steps are the same as those in Example 1.

[0048] Comparative Example 3 An airtight flame-retardant chemical protective fabric, which is different from that in Example 1 in that no modified polyurethane fiber is added to the composite fiber comfort layer in step S3. The specific preparation method is as follows: Taking profiled-section polyester fibers as the warp and the yarn obtained by ring spinning the modified bamboo fibers obtained in step S1 of Preparation Example 1 as the weft, weaving is carried out according to a warp density of 360 per 10 cm and a weft density of 210 per 10 cm to obtain a composite fiber comfort layer; Other steps are the same as those in Example 1.

[0049] Comparative Example 4 An airtight flame-retardant chemical protective fabric, which is different from that in Example 1 in that the profiled-section polyester fibers used in the composite fiber comfort layer in step S3 are replaced with ordinary polyester fibers with a circular cross-section and a specification of 75D / 36F. Other steps are the same as those in Example 1. Performance detection test

[0050] The following relevant performances of the airtight flame-retardant chemical protective fabrics obtained in Examples 1-6 and Comparative Examples 1-4 are detected. Each performance detection test is carried out 3 times, and the average value of the 3 test results is taken as the final result, and the results are recorded in Table 1-2.

[0051] 1. Chemical protection performance: According to the relevant regulations on the airtight chemical protective clothing-1ET in GB 24539-2021 "Protective clothing-Chemical protective clothing", the permeation performance and liquid pressure resistance penetration performance of the fabric are detected, and the permeation time and pressure resistance penetration grade of the fabric are evaluated and recorded; 2. Flame retardancy: According to the relevant regulations on the flame retardant performance of fire fighter chemical protective clothing in GB / T 13489-1992, the flame burning and non-flame burning time and damage length of the fabric are detected; 3. Mechanical properties: The trapezoidal tear strength and breaking strength of the fabric are detected respectively according to the relevant regulations in GB / T 3917.3 and GB / T 3923.1; 4. Moisture Absorption and Diffusion Performance Test: According to the relevant regulations in GB / T 21655.1-2008 "Evaluation of Moisture Absorption and Quick Drying Performance of Textiles", the moisture absorption and moisture diffusion properties of the airtight flame-retardant and chemical-protective fabric obtained in Examples 1-6 and Comparative Examples 1-4 after roller-coating the PU antibacterial inner layer on the composite fiber comfort layer were detected. The specification of each group of test fabrics was 10 cm × 10 cm; 5. Thermal Protection Performance: The thermal protection performance of the fabric was detected according to the relevant regulations of GB / T 8965.1-2020; 6. Antibacterial Property: The antibacterial rate of the fabric was detected according to the relevant regulations of GB / T20944.3-2008 "Evaluation of Antibacterial Properties of Textiles - Part 3: Oscillation Method".

[0052] Table 1

[0053] Table 2

[0054] It can be seen from the performance test results in Tables 1-2 that an airtight flame-retardant and chemical-protective fabric of the present application not only has high flame retardancy, but also has excellent chemical protection performance and thermal protection performance. It can effectively isolate the penetration of chemical substances and meet the flame-retardant and chemical protection performance requirements for airtight chemical protective clothing and firefighter protective clothing specified in GB 24539-2021 and GB / T 13489-1992. This shows that the flame-retardant and chemical-protective clothing prepared from the airtight flame-retardant and chemical-protective fabric of the present application. At the same time, the inner layer of the fabric has high moisture absorption and moisture diffusion performance and excellent antibacterial property, which can effectively adsorb the sweat of high-temperature workers and diffuse it inside the protective clothing, preventing the accumulation of sweat locally, significantly reducing the problems of sultriness and sweat accumulation that are likely to occur after long-term work of the wearer, improving the comfort and work efficiency of the wearer, and avoiding skin problems or hygiene risks caused by the growth of bacteria due to long-term wearing of the fabric. It can effectively protect the staff in industries such as fire protection, petrochemical, metallurgical casting, and electric power and electrical that are in high-temperature and chemical working environments for a long time.

[0055] It can be seen from the performance test results of Examples 1-4 and Comparative Examples 1-4 that by using modified bamboo fiber as the core yarn, modified polyurethane fiber as the outer covering wire to prepare composite spandex fiber and then using it as the weft yarn, and using profiled cross-section polyester fiber as the warp yarn to prepare the composite fiber comfort layer, the fabric can be given good flexibility, which is convenient for the wearer to move flexibly during work.

[0056] Furthermore, a gradient sweat-absorbing system is formed inside the composite fiber comfort layer. If only profiled-section polyester fibers are used to prepare the composite fiber comfort layer, although it has excellent moisture-conducting performance, its moisture absorption and water storage capacity are poor. If only modified bamboo fibers or modified polyurethane fibers and profiled-section polyester fibers are used to prepare the composite fiber comfort layer, a gradient sweat-absorbing system with water absorption difference cannot be formed, resulting in that neither the moisture absorption and water storage capacity nor the moisture-conducting performance can reach the best state. Under the design of this application, the modified bamboo fiber is used as the core yarn, and the modified polyurethane fiber is used as the outer wrapping yarn to prepare the composite spandex fiber and then used as the weft, and the profiled-section polyester fiber is used as the warp to prepare the composite fiber comfort layer. While not affecting the airtightness of the fabric, it can adsorb sweat and diffuse and store it inside the composite fiber comfort layer, forming a dual-effect drive of moisture absorption and moisture conduction, effectively preventing sweat from accumulating on the skin surface or in the local fabric, resulting in stuffiness and discomfort and stickiness, and significantly improving the wearing comfort of the fabric.

[0057] It can be seen from the performance test results of Examples 1-4, Example 5 and Comparative Examples 1-3 that the addition of acrylamide-acrylonitrile-acrylic acid terpolymer, in cooperation with bamboo pulp fibers, can significantly enhance the water absorption and storage capacity of the composite fiber comfort layer, promote the performance of the gradient sweat-absorbing system in the inner layer of the fabric, promote the adsorption and diffusion of sweat, prevent the reverse seepage of sweat from causing a great burden on the wearer, reduce the accumulation of sweat and local stuffiness, and significantly improve the thermal protection performance and wearing comfort of the fabric.

[0058] In addition, acrylamide-acrylonitrile-acrylic acid terpolymer has a large heat capacity at high temperatures, can absorb a large amount of heat, can further improve the flame retardant and heat insulation performance of the fabric, form an effective isolation between the human body and the external heat source, enhance the thermal protection performance of the fabric, and can cooperate with the PCM temperature-regulating microcapsules of the PU antibacterial inner layer at high temperatures. The use of the temperature-regulating PCM phase change microcapsules in the inner layer can absorb the excess heat on the body surface, cooperate with the acrylamide-acrylonitrile-acrylic acid terpolymer in the composite fiber comfort layer, keep the body surface temperature at high temperatures, reduce the generation, accumulation and stuffiness of sweat, thereby improving the wearing comfort of the fabric.

[0059] It can be seen from the performance test results of Examples 1-4 and Example 6 that nano-silver and chitosan quaternary ammonium salt, as cationic antibacterial agents, have good compatibility with the PU antibacterial inner layer and can also effectively play their antibacterial roles. Compared with the single use of nano-silver or chitosan quaternary ammonium salt as the cationic antibacterial agent, the cooperation of the two can play a stronger antibacterial effect in the PU antibacterial inner layer.

[0060] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An airtight flame-retardant chemical-resistant fabric, characterized in that, It successively includes a PVC flame retardant layer, an EVOH barrier layer, a composite fiber comfort layer, and a PU antibacterial inner layer from the outside to the inside; The raw materials of the composite fiber comfort layer include profiled cross-section polyester fibers and composite spandex fibers; The raw materials of the composite spandex fibers include modified polyurethane fibers and modified bamboo fibers.

2. The airtight flame-retardant chemical protection fabric according to claim 1, characterized in that , The raw materials of the modified bamboo fibers include bamboo pulp fibers and acrylamide-acrylonitrile-acrylic acid terpolymer with a mass ratio of (4-6):

1.

3. The airtight flame-retardant and chemical-resistant fabric according to claim 1, characterized in that , The raw materials of the modified polyurethane fibers, by weight, include 38-43 parts of polyester polyol, 20-23 parts of aliphatic isocyanate, 2-6 parts of hydrophilic molecular chain extender, and 0.1-0.2 parts of dibutyltin dilaurate.

4. The airtight flame-retardant chemical protection fabric according to claim 1, wherein The raw materials of the PU antibacterial inner layer, by weight, include 35-45 parts of anionic aliphatic waterborne PU, 1.5-2.5 parts of cationic antibacterial agent, 5-8 parts of temperature-regulating PCM phase change microcapsules, 0.05-0.1 part of dispersant, and 0.1-0.2 part of thickener.

5. The airtight flame-retardant and chemical-resistant fabric according to claim 4, characterized in that , The cationic antibacterial agent is selected from any one or a combination of two of nano silver and chitosan quaternary ammonium salt.

6. The airtight flame-retardant chemical protective fabric according to claim 1, wherein , The raw materials of the PVC layer include aluminum hydroxide and PVC resin with a mass ratio of 1:(4-6).

7. The airtight flame-retardant and chemical-protective fabric according to claim 1, wherein , The EVOH barrier layer successively includes a first PE layer, a first TIE layer, a first copolymerized PA layer, an EVOH barrier layer, a second copolymerized PA layer, a second TIE layer, and a second PE layer from the outside to the inside.

8. The preparation method of the airtight flame-retardant chemical protective fabric according to any one of claims 1-7, characterized in that , including the following steps: S1: Prepare the composite fiber comfort layer: (1) Using the modified bamboo fiber as the core yarn and the modified polyurethane fiber as the outer wrap, twist them according to a strand ratio of 1:(2.5-3.5), and perform ring spinning to obtain composite spandex fibers; (2) Using profiled cross-section polyester fibers as the warp and composite spandex fibers as the weft, perform weaving according to a warp density of 360-380 ends / 10 cm and a weft density of 200-220 picks / 10 cm to obtain the composite fiber comfort layer; S2: Composite the PVC flame retardant layer with the EVOH barrier layer and the composite fiber comfort layer in sequence to obtain a preliminary fabric; S3: According to the raw material ratio, ultrasonically mix the anionic aliphatic waterborne PU, cationic antibacterial agent, temperature-regulating PCM phase change microcapsules, dispersant, and thickener evenly, and roll-coat them on the side of the composite fiber comfort layer of the preliminary fabric away from the EVOH barrier layer, and cure to form the PU antibacterial inner layer, thus obtaining the product.

9. The preparation method of the airtight flame-retardant chemical protection fabric according to claim 8, characterized in that , The preparation method of the modified bamboo fiber includes the following steps: Soak the bamboo pulp fibers in an H2O2 solution, adjust the pH to (9±0.5), heat and stir at 60-70°C for 35-45 min, wash and dry to obtain pretreated bamboo pulp fibers; Dissolve the pretreated bamboo pulp fibers in an ionic solution according to a material-liquid ratio of 1:(8-11), heat and stir evenly, add acrylamide-acrylonitrile-acrylic acid terpolymer, adjust the pH to 7-8, ultrasonically disperse, and then add N,N'-methylenebisacrylamide, and stir to form a homogeneous spinning solution; Age the spinning solution, and then obtain the modified bamboo fiber through dry spinning.

10. The preparation method of the airtight flame-retardant chemical protective fabric according to claim 8, characterized in that , The preparation method of the modified polyurethane fibers includes the following steps: Mix the polyester polyol and the aliphatic isocyanate, heat and stir in an inert gas atmosphere at 80-100 °C, cool down to 60-70 °C, add the hydrophilic molecular chain extender and dibutyltin dilaurate, and continue stirring until the reaction is complete to obtain the polyurethane stock solution; Pour the polyurethane stock solution into deionized water and stir to form a spinning solution, carry out aging, and then perform dry spinning to obtain the product.

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