Antibacterial and breathable elastic fiber fabric, and preparation method and application thereof

Abstract

The application discloses an antibacterial and breathable elastic fiber fabric and a preparation method and application thereof, and belongs to the field of high polymer fiber fabric preparation. The antibacterial and breathable performance and elasticity of the fiber fabric need to be further improved. The application is to prepare a fiber-forming elastomer containing a siloxane flexible chain segment, a disulfide bond unit and an unsaturated side group, to further prepare a bridged wetting functional body with a catechol group, a sulfur-containing group and a zwitterionic structure, and to construct an antibacterial and breathable finishing agent containing a silicon oxide network, a phytic acid-zinc coordination structure and a tannic acid multi-point binding action. The antibacterial and breathable elastic fabric is prepared through the synergistic action of the three. The antibacterial and breathable elastic fabric can consider the antibacterial property, the wetting property, the breathability and the elastic recovery performance of the fabric, and can improve the structural stability and the wearing comfort.

Description

Technical Field

[0001] This invention relates to the field of polymer fiber-based fabric preparation, specifically to an antibacterial and breathable elastic fiber fabric, its preparation method, and its application. Background Technology

[0002] Antibacterial and breathable elastic fiber fabrics are mostly made of elastic or composite fibers such as polyester, nylon, and spandex as the base fabric, and then endowed with antibacterial, moisture-wicking and breathable functions through impregnation, coating, lamination or finishing. Commonly used antibacterial components include silver, zinc, quaternary ammonium salts and natural polyphenols. Commonly used breathability or comfort adjustment methods include porous finishing, hydrophilic finishing, surface modification and composite functional additive finishing. Some products also use multi-layer composite, blended spinning or surface grafting methods to make the fabric have elasticity, antibacterial and a certain moisture and heat transfer capacity at the same time to meet the application needs of close-fitting wear, sports protection and functional clothing.

[0003] Currently, antibacterial and breathable finishing components are mostly applied to the surface of fibers or fabrics through finishing processes. The functional layer and the substrate mainly rely on physical adsorption or general interfacial adhesion. During use, under conditions of sweat, friction, washing, and repeated stretching, migration, loss, or uneven distribution are likely to occur. Especially for elastic fiber fabrics, the surface finishing layer is more prone to local cracking, peeling, or functional degradation under dynamic deformation, resulting in insufficient stability of antibacterial function. Furthermore, the degree of fixation of finishing agents on the fiber surface is limited, making it difficult to balance structural integrity and functional retention under continuous use conditions.

[0004] Furthermore, traditional antibacterial finishing and breathable / moisture-wicking finishing are often constructed separately, lacking effective synergy between functional components. This can easily lead to situations where one type of function is enhanced while another is limited. For example, some finishing layers increase the surface coverage to increase the antibacterial component load, which can easily affect the fabric's pore channels and moisture transfer paths. While some moisture-wicking or hydrophilic finishinges can improve moisture transfer, their interfacial compatibility with the elastic substrate is insufficient, making it difficult to maintain a continuous and stable moisture transfer path after repeated stretching. As a result, elastic fiber fabrics still suffer from insufficient coordination between antibacterial properties, breathability, moisture wicking, and elasticity. Summary of the Invention

[0005] The purpose of this invention is to provide an antibacterial and breathable elastic fiber fabric, its preparation method and application, mainly addressing the problem that the antibacterial, breathable and elastic properties of fiber fabrics need to be further improved.

[0006] The objective of this invention can be achieved through the following technical solution: a method for preparing an antibacterial and breathable elastic fiber fabric, comprising the following steps:

[0007] S1. N,N-Dimethylformamide is added to the spinning kettle and stirred. Fiber-forming elastomer is added and stirred until dissolved. After mixing evenly, the bridging moisture-wicking functional material is added. After stirring evenly again, 2-hydroxy-2-methylphenylacetone is added. After degassing and filtration, wet spinning is performed. Post-treatment yields a moisture-wicking and antibacterial elastic fiber formed by composite molding of fiber-forming elastomer, bridging moisture-wicking functional substrate, and photoinitiator. A moisture-wicking and antibacterial elastic fabric is then woven. The fiber-forming elastomer is a polyurethane elastomer containing dynamic covalent bond units, unsaturated side chains, and flexible siloxane segments.

[0008] S2. Add anhydrous ethanol, deionized water, and glacial acetic acid to a mixing tank and stir until homogeneous. Then add an antibacterial and breathable finishing agent and continue stirring until homogeneous to obtain a composite finishing solution. Then immerse the moisture-wicking and antibacterial elastic fabric in the composite finishing solution and perform post-treatment to obtain an antibacterial and breathable elastic fabric obtained by impregnating and finishing the moisture-wicking and antibacterial elastic fabric with an antibacterial and breathable finishing substrate. The antibacterial and breathable finishing substrate is a composite finishing substrate containing a metal coordination structure, a polyphenol structure, and a siloxane crosslinking network.

[0009] Further, in step S1, the ratio of N,N-dimethylformamide, fiber-forming elastomer, bridging moisture-wicking functional material, and 2-hydroxy-2-methylphenylacetone is 290-350mL:90-110g:10-14g:0.9-1.1g. The post-treatment includes: stretching the nascent fiber 2.0-2.5 times in warm water at 60-65℃, then irradiating it with 365nm ultraviolet light for 2-4min, and then drying it under hot air at 75-85℃ for 8-12min to obtain a moisture-wicking and antibacterial elastic fiber with a diameter of 35-45μm, which is formed by composite molding of fiber-forming elastomer, bridging moisture-wicking functional material, and photoinitiator.

[0010] Furthermore, in step S1, the weaving operation is as follows: the yarn tension is controlled at 0.18-0.25 cN / dtex, the loop length is controlled at 0.28-0.32 cm, and the fabric surface density is controlled at 150-170 g / m². 2 The heat setting temperature is 100-110℃, and the heat setting time is 40-60s;

[0011] Further, in step S2, the ratio of anhydrous ethanol, deionized water, glacial acetic acid, antibacterial and breathable finishing agent, and moisture-wicking and antibacterial elastic fabric is 280-320mL:680-720mL:1.8-2.2mL:35-45mL:40-60g. The post-treatment includes: impregnation for 3-5 minutes, with the liquid retention rate controlled at 70-85%, followed by pre-drying at 85-95℃ for 2-4 minutes, baking at 125-135℃ for 1.5-2.5 minutes, leaving at room temperature for 10-14 hours, washing once with water at 40-50℃, and then drying at 55-65℃ to obtain an antibacterial and breathable elastic fabric obtained by impregnation and finishing of the moisture-wicking and antibacterial elastic fabric with an antibacterial and breathable finishing substrate.

[0012] Furthermore, the preparation method of the fiber-forming elastomer is as follows: polytetrahydrofuran diol and hydroxyl-terminated polydimethylsiloxane are added to a reaction vessel and stirred. After mixing evenly, the reaction vessel is heated to 100-110℃ and dehydrated under vacuum for 0.8-1.2h. Then, the reaction vessel is cooled to 70-75℃, isophorone diisocyanate and dibutyltin dilaurate are added, and the mixture is kept warm and stirred for 2-3h. The mixture is then added to the reaction vessel and kept warm and stirred at 55-60℃ for 2.5-3.5h. After stirring, the reaction solution is placed under vacuum at 60-70℃ to remove the solvent for 4-6h to obtain the fiber-forming elastomer.

[0013] The reaction mechanism for preparing fiber elastomers is as follows:

[0014]

[0015] In the formula: ; ; ; .

[0016] Furthermore, the ratio of the polytetrahydrofuran diol, hydroxyl-terminated polydimethylsiloxane, isophorone diisocyanate, dibutyltin dilaurate, and the mixture is 32-39 g: 13-16 g: 10-14 mL: 0.02-0.05 mL: 55-60 mL. The mixture is obtained by mixing N,N-dimethylformamide, bis(2-hydroxyethyl) disulfide, and 3-allyloxy-1,2-propanediol in a ratio of 108-132 mL: 2.6-3.2 g: 3.1-3.9 mL. The post-treatment includes: after stirring, the reaction solution is placed under vacuum at 60-70°C to remove the solvent for 4-6 hours to obtain the fiber-forming elastomer.

[0017] Furthermore, the preparation method of the bridged moisture-wicking functional body is as follows: L-aspartic acid and 85wt% phosphoric acid are added to a reaction vessel and stirred. After mixing evenly, the reaction vessel is heated to 185-195℃ and kept at this temperature for 3.5-4.5h. Then, it is further treated under 10-20kPa conditions for 0.8-1.2h. Subsequently, the reaction vessel is cooled to 50-60℃, dimethyl sulfoxide is added and stirred evenly, and then dopamine hydrochloride, cysteine, 3-morpholinopropylamine and triethylamine are added in sequence. The mixture is kept at this temperature for 7-9h and then 1,3-propanesulfonyl lactone is added. The mixture is kept at this temperature for 5-7h and then post-treated to obtain the bridged moisture-wicking functional body.

[0018] Furthermore, the ratio of L-aspartic acid, 85wt% phosphoric acid, dimethyl sulfoxide, dopamine hydrochloride, cysteine, 3-morpholinopropylamine, triethylamine, and 1,3-propanesulfonyl lactone is 21-27g:0.4-0.6mL:180-210mL:4-6g:1.8-2.3g:3.1-4.1mL:10-12mL:2.9-3.6g. The post-treatment includes: after stirring, pouring the reaction solution into anhydrous ethanol of twice the volume of the reaction solution to precipitate solids, filtering and collecting the filter cake, dispersing the filter cake in deionized water of the same volume as the reaction solution and dialyzing for 24-48h, and then freeze-drying for 18-24h to obtain the bridging moisture-wicking functional body.

[0019] Furthermore, the preparation method of the antibacterial and breathable finishing agent is as follows: anhydrous ethanol, deionized water and glacial acetic acid are added to a reaction vessel and stirred. After mixing evenly, 3-aminopropyltriethoxysilane and tetraethyl orthosilicate are added sequentially. The mixture is stirred at 25-30°C for 30-50 min. Then, 50 wt% phytic acid solution and tannic acid are added and stirred evenly. Zinc acetate dihydrate is added and stirred for another 50-70 min. After stirring, the mixture is allowed to stand at room temperature for 10-14 h to obtain the antibacterial and breathable finishing agent.

[0020] Furthermore, the ratio of the amounts of anhydrous ethanol, deionized water, glacial acetic acid, 3-aminopropyltriethoxysilane, tetraethyl orthosilicate, 50wt% phytic acid solution, tannic acid, and zinc acetate dihydrate is 120-130mL:36-40mL:0.9-1.0mL:5-6mL:8-10mL:9-11mL:4-5g:2.7-3.3g.

[0021] The present invention also discloses an antibacterial and breathable elastic fiber fabric, which is prepared by the above-mentioned method for preparing an antibacterial and breathable elastic fiber fabric.

[0022] The present invention also discloses the application of an antibacterial and breathable elastic fiber fabric, which is used in the preparation of underwear.

[0023] The present invention has the following beneficial effects:

[0024] 1. The antibacterial and breathable finishing agent prepared in this invention, after being applied to the outer layer of the fiber, does not exist as an independent surface adhesion layer, but rather forms a functional connection from the outside to the inside with the internal bridging moisture-wicking functional body and fiber-forming elastomer. The antibacterial and breathable finishing agent provides a relatively stable functional interface on the fabric surface, while the bridging moisture-wicking functional body enables the near-surface area of ​​the fiber to maintain continuous moisture migration capacity, thereby reducing the retention of moisture and heat in local areas. The flexible support formed by the fiber-forming elastomer also enables the outer finishing interface to maintain a good fit with the fiber matrix under bending, stretching, and skin-rubbing conditions. Based on the above combination, the fabric surface state, near-surface mass transfer state, and matrix bearing state are more likely to form a coordinated and unified overall relationship.

[0025] 2. The bridging moisture-wicking functional body prepared by this invention mainly plays a role in organizing the mass transfer pathways inside the fiber in this system. However, its role does not come from the simple introduction of a single hydrophilic component, but is based on its cooperation with the fiber-forming elastomer and the antibacterial and breathable finishing agent. After the bridging moisture-wicking functional body is distributed inside the fiber, it can make the migration path of moisture between the inside and outside of the fiber more continuous. The fiber-forming elastomer provides recoverable structural support, so that the internal microchannels still have good retention ability during the process of stress, fit, and repeated deformation of the fabric. The antibacterial and breathable finishing agent located on the outer layer forms a connection with the internal migration process, so that the surface interface and internal mass transfer are not easily disconnected. Thus, the material system is more likely to maintain a relatively uniform surface state and mass transfer state during use.

[0026] 3. The fiber-forming elastomer prepared by this invention not only constitutes the basic continuous phase of the fiber, but also maintains good structural coordination of the fabric under dynamic use conditions through its matching relationship with the bridging moisture-wicking functional body and the antibacterial and breathable finishing agent. The fiber-forming elastomer provides the necessary flexible support and recovery basis. After the bridging moisture-wicking functional body enters its interior, it does not destroy the continuity of the matrix, but rather helps the internal structure of the fiber to maintain a relatively balanced state when under stress. When the antibacterial and breathable finishing agent is located on the outer layer of the fiber, it does not form a clear boundary with the elastic matrix, but rather maintains a compliant cooperation with the matrix and the internal functional phase. Therefore, during repeated stretching, recovery and friction, the surface functional interface, the internal mass transfer structure and the matrix deformation state are more likely to remain consistent. Detailed Implementation

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

[0028] In this application, the polytetrahydrofuran glycol used is dihydroxy-terminated polytetrahydrofuran glycol with a functionality of 2, a number-average molecular weight of 1000-1400 g / mol, a hydroxyl value of 80-112 mgKOH / g, and a moisture content of no more than 0.05 wt%; the hydroxyl-terminated polydimethylsiloxane used is dihydroxy-terminated polydimethylsiloxane with a functionality of 2, a number-average molecular weight of 1600-2000 g / mol, a hydroxyl value of 56-70 mgKOH / g, and a viscosity of 1000-2000 mPa·s at 25°C.

[0029] Example 1

[0030] This embodiment provides a method for preparing an antibacterial and breathable elastic fiber fabric, including the following steps:

[0031] Step 1: Preparation of fiber elastomer

[0032] Weigh out 108.0 mL of N,N-dimethylformamide, 2.6 g of bis(2-hydroxyethyl) disulfide and 3.1 mL of 3-allyloxy-1,2-propanediol and mix them to obtain a mixture.

[0033] Weigh out 32.0 g of polytetrahydrofuran glycol and 13.0 g of hydroxyl-terminated polydimethylsiloxane and add them to a reaction vessel. Stir until homogeneous, then heat the reaction vessel to 100°C and dehydrate under vacuum for 0.8 h. Next, cool the reaction vessel to 70°C, add 10.0 mL of isophorone diisocyanate and 0.02 mL of dibutyltin dilaurate, and maintain the temperature and stir for 2 h. Then add 55.0 mL of the mixture to the reaction vessel and continue stirring at 55°C for 2.5 h. After stirring, place the reaction solution at 60°C. The solvent was removed under vacuum for 4 hours to obtain a fiber-forming elastomer. The polytetrahydrofuran diol was a dihydroxy-terminated polytetrahydrofuran diol with a functionality of 2, a number-average molecular weight of 1000 g / mol, a hydroxyl value of 112 mg KOH / g, and a moisture content of no more than 0.05 wt%. The hydroxyl-terminated polydimethylsiloxane was a dihydroxy-terminated polydimethylsiloxane with a functionality of 2, a number-average molecular weight of 1600 g / mol, a hydroxyl value of 70 mg KOH / g, and a viscosity of 1000 mPa·s at 25°C.

[0034] The reaction principle for preparing fiber elastomers is as follows:

[0035] Polytetrahydrofuran diol undergoes a stepwise addition reaction with the terminal hydroxyl groups in hydroxyl-terminated polydimethylsiloxane under the action of isophorone diisocyanate, forming polyurethane segments linked by urethane bonds; bis(2-hydroxyethyl) disulfide participates in chain growth as a diol chain extender, enabling disulfide bonds to be embedded in the polyurethane backbone; 3-allyloxy-1,2-propanediol participates in polymerization through hydroxyl groups, and its allyl structure is retained in the polymer side groups. This step corresponds to the polyurethane molecule construction process containing siloxane flexible segments, disulfide bond units, and unsaturated side groups.

[0036] The mechanism of action of fiber elastomers in antibacterial and breathable elastic fabrics is as follows:

[0037] The properties of this fiber-forming elastomer are mainly derived from the synergistic configuration of various structural units at the molecular chain level. Among them, polytetrahydrofurandiol constitutes a flexible soft segment continuous phase, endowing the material with good chain mobility, ductility, and fiber-forming basis; hydroxyl-terminated polydimethylsiloxane introduces flexible siloxane segments, which helps to improve molecular chain flexibility, interfacial compliance, and dynamic deformation adaptability; the urethane linkage structure formed by isophorone diisocyanate provides the necessary polar effect and support effect, enabling the material to maintain soft elongation while possessing a certain degree of resilience and dimensional stability; the disulfide bonds introduced by bis(2-hydroxyethyl) disulfide can enhance the chain segment conformation regulation and local stress relief ability, thereby improving the toughness and cyclic recovery stability of the system; the unsaturated side groups retained by 3-allyloxy-1,2-propanediol are beneficial to optimizing the chain segment stacking state, improving structural openness and subsequent interfacial adaptation potential. Thus, the resulting fiber-forming elastomer exhibits a relatively balanced performance characteristics between softness, elastic resilience, fatigue resistance, and composite processing adaptability.

[0038] Step 2: Preparation of the bridging moisture-wicking functional body

[0039] Weigh out 21.0 g of L-aspartic acid and 0.4 mL of 85 wt% phosphoric acid and add them to the reaction vessel. Stir until homogeneous, then heat the reaction vessel to 185 °C and stir for 3.5 h. Continue the treatment at 10 kPa for 0.8 h. Then cool the reaction vessel to 50 °C, add 180.0 mL of dimethyl sulfoxide and stir until homogeneous. Then add 4.0 g of dopamine hydrochloride, 1.8 g of cysteine, 3.1 mL of 3-morpholinopropylamine and 10.0 mL of triethylamine in sequence. Stir for 7 h. Then add 2.9 g of 1,3-propanesulfonyl lactone and continue stirring for 5 h. After stirring, pour the reaction solution into anhydrous ethanol with twice the volume of the reaction solution to precipitate solids. Filter and collect the filter cake. Disperse the filter cake in deionized water with the same volume of the reaction solution and dialyze for 24 h. Then freeze-dry for 18 h to obtain the bridging moisture-wicking functional body.

[0040] The reaction principle for preparing the bridging moisture-conducting functional body is as follows:

[0041] L-Aspartic acid undergoes dehydration condensation polymerization under phosphoric acid catalysis and heating to form a polysuccinimide precursor containing repeating succinimide units. Subsequently, the imide ring in the precursor undergoes a nucleophilic ring-opening reaction under the action of amine compounds. Dopamine hydrochloride, cysteine, and 3-morpholinopropylamine introduce catechol groups, sulfur-containing groups, and tertiary amine structures into the polymer side chain, respectively. Then, the side chain tertiary amine undergoes ring-opening quaternization with 1,3-propanesulfonyl lactone to form a zwitterionic structure containing both quaternary ammonium positively charged centers and sulfonate negatively charged centers. This step is essentially the process by which the polysuccinimide precursor is transformed into a multifunctional polyasparagine derivative after ring-opening modification with polyamines.

[0042] The mechanism of action of fiber elastomers in antibacterial and breathable elastic fabrics is as follows:

[0043] The performance of this bridging moisture-wicking functional body is based on the synergistic construction of the polyasparagine-derived main chain and various functional side groups. The polymer backbone formed by the conversion of L-aspartic acid provides high polarity density and continuous modifiable sites, giving the material itself a good hydrophilic foundation and structural load-bearing capacity. The catechol groups introduced by dopamine hydrochloride have a strong tendency for interfacial interaction, which is beneficial for its stable bonding with fibers or other components in subsequent systems, thereby improving the adhesion stability and bridging ability of the functional layer. The sulfur-containing segments introduced by cysteine ​​can improve intermolecular compliance and interfacial compatibility, making the functional body more adaptable to matrix deformation during the composite process. The zwitterionic structure formed by further conversion of 3-morpholinopropylamine simultaneously brings strong hydration capacity, ionic dipole interaction, and a continuous hydrophilic microenvironment, which helps with moisture absorption, moisture transfer, and directional water migration. Thus, this functional body combines interfacial anchoring, structural bridging, and moisture-wicking characteristics, making it easier to establish continuous moisture conduction channels between the material's interior and surface layers, and maintain a relatively stable functional state.

[0044] Step 3: Preparation of antibacterial and breathable finishing agent

[0045] Weigh out 120.0 mL of anhydrous ethanol, 36.0 mL of deionized water, and 0.9 mL of glacial acetic acid and add them to a reaction vessel. Stir and mix thoroughly. Then add 5.0 mL of 3-aminopropyltriethoxysilane and 8.0 mL of tetraethyl orthosilicate. Stir at 25 °C for 30 min. Then add 9.0 mL of 50 wt% phytic acid solution and 4.0 g of tannic acid. Stir thoroughly and then add 2.7 g of zinc acetate dihydrate. Continue stirring for 50 min. After stirring, let stand at room temperature for 10 h to obtain an antibacterial and breathable finishing agent.

[0046] The reaction principle for preparing antibacterial and breathable finishing agents is as follows:

[0047] 3-Aminopropyltriethoxysilane and tetraethyl orthosilicate undergo hydrolysis in an ethanol-water-acidic system to generate a silanol intermediate, which further condenses to form a Si-O-Si bonded silicon-oxygen network. The polyphosphate groups in phytic acid coordinate with zinc ions to form a phytic acid-zinc coordination structure. The polyphenolic hydroxyl groups in tannic acid form hydrogen bonds, coordination, or associations with phytic acid, zinc ions, and oxygen-containing sites in the silicon-oxygen network. Thus, this system can be described as a composite finishing system with a silicon-oxygen condensation structure as the main component, accompanied by the phytic acid-zinc coordination structure and the multi-site association of tannic acid.

[0048] The mechanism of action of antibacterial and breathable finishing agents in antibacterial and breathable elastic fabrics is as follows:

[0049] The performance of this antibacterial and breathable finishing agent mainly stems from the synergistic configuration between the silicon-oxygen network framework, coordination structural units, and polyphenol association units. Among these, 3-aminopropyltriethoxysilane and tetraethyl orthosilicate ultimately contribute an inorganic-organic hybrid network linked by Si-O-Si bonds. This structure plays a role in continuous film formation, interfacial adhesion, and pore support within the system, giving the finished layer a certain degree of stability, uniformity, and openness on the fabric surface, thus preserving necessary pathways for gas and water vapor to pass through. The aminopropyl groups introduced by 3-aminopropyltriethoxysilane also enhance the interaction between the system and the fiber surface. The polyphosphate structure introduced by phytic acid has a relatively... Its high polarity and multi-site coordination characteristics, when combined with zinc ions, form a relatively stable phytic acid-zinc functional unit, which not only improves the fixation of active components in the finishing layer, but also makes the surface of the system richer in polar sites and ion interaction centers. The polyphenolic hydroxyl groups provided by tannic acid further enhance the hydrogen bonding association, coordination synergy and interface coverage in the system, which helps to improve the integrity of the finishing layer and the uniformity of surface function. The resulting composite finishing system is not a single dense covering layer, but rather a surface structure with stable adhesion, active carrying and channel retention characteristics, which plays a fundamental role in the coordinated maintenance of fabric antibacterial properties, breathability and wearing comfort.

[0050] Step 4: Preparation of moisture-wicking and antibacterial elastic fibers

[0051] Weigh 290.0 mL of N,N-dimethylformamide and add it to the spinning kettle. Stir, add 90.0 g of fiber-forming elastomer and stir to dissolve. After mixing evenly, add 10.0 g of bridging moisture-wicking functional material and continue stirring evenly. Then add 0.9 g of 2-hydroxy-2-methylphenylacetone. After degassing and filtration, wet spinning is performed. The nascent fiber is stretched 2.0 times in 60℃ warm water, then irradiated with 365nm ultraviolet light for 2 min, and then dried under 75℃ hot air for 8 min to obtain a moisture-wicking and antibacterial elastic fiber with a diameter of 35 μm.

[0052] Step 5: Prepare moisture-wicking and antibacterial elastic fabric

[0053] Moisture-wicking and antibacterial elastic fibers are fed into a knitting machine for weaving. The yarn tension is controlled at 0.18 cN / dtex, the loop length is controlled at 0.28 cm, and the fabric surface density is controlled at 150 g / m². 2 The heat setting temperature is 100℃ and the heat setting time is 40s to obtain a moisture-wicking and antibacterial elastic fabric.

[0054] Step Six: Preparation of Antibacterial, Breathable, Elastic Fabric

[0055] Weigh out 280.0 mL of anhydrous ethanol, 680.0 mL of deionized water and 1.8 mL of glacial acetic acid and add them to the mixing tank. Stir and mix well. Then add 35.0 mL of antibacterial and breathable finishing agent and continue stirring until a composite finishing solution is obtained. Then immerse 40.0 g of moisture-wicking and antibacterial elastic fabric in the composite finishing solution for 3 min, with the liquid content controlled at 70%. Then pre-dry at 85℃ for 2 min and bake at 125℃ for 1.5 min. After standing at room temperature for 10 h, wash once with water at 40℃ and then dry at 55℃ to obtain antibacterial and breathable elastic fabric.

[0056] The reaction principle for preparing antibacterial, breathable, and elastic fabrics is as follows:

[0057] The fiber-forming elastomer forms a uniform spinning system in N,N-dimethylformamide, the bridging moisture-wicking functional body is dispersed in the polyurethane matrix, and the photoinitiator is uniformly present in the spinning solution. During wet spinning, mass transfer occurs between the solvent and the coagulation medium, and the polymer system solidifies into continuous fibers through phase separation. Stretching orients the polymer segments along the fiber axis. During the ultraviolet irradiation stage, the photoinitiator decomposes to generate free radicals, and the unsaturated side groups undergo free radical reactions under irradiation conditions, thereby introducing a certain degree of bridging connections within the fiber. Knitting and heat setting correspond to the establishment of the geometric configuration of the fiber assembly and the fixation of the chain segment conformation. During the finishing stage, the silane component in the composite finishing solution continues to undergo hydrolysis and condensation, and the coordination and association between phytic acid, tannic acid, and zinc ions assembles on the fabric surface. Baking promotes further condensation of the silicon-oxygen structure and fixes the composite structure on the fabric surface and near-surface area.

[0058] Example 2

[0059] This embodiment provides a method for preparing an antibacterial and breathable elastic fiber fabric, including the following steps:

[0060] Step 1: Preparation of fiber elastomer

[0061] Weigh out 132.0 mL of N,N-dimethylformamide, 3.2 g of bis(2-hydroxyethyl) disulfide and 3.9 mL of 3-allyloxy-1,2-propanediol and mix them to obtain a mixture.

[0062] Weigh out 39.0 g of polytetrahydrofuran glycol and 16.0 g of hydroxyl-terminated polydimethylsiloxane and add them to a reaction vessel. Stir until homogeneous, then heat the reaction vessel to 110°C and dehydrate under vacuum for 1.2 h. Next, cool the reaction vessel to 75°C, add 14.0 mL of isophorone diisocyanate and 0.05 mL of dibutyltin dilaurate, and maintain the temperature and stir for 3 h. Then add 60.0 mL of the mixture to the reaction vessel and continue stirring at 60°C for 3.5 h. After stirring, place the reaction solution at 70°C. The solvent was removed under vacuum for 6 hours to obtain a fiber-forming elastomer. The polytetrahydrofuran diol was a dihydroxy-terminated polytetrahydrofuran diol with a functionality of 2, a number-average molecular weight of 1400 g / mol, a hydroxyl value of 80 mg KOH / g, and a moisture content of no more than 0.05 wt%. The hydroxyl-terminated polydimethylsiloxane was a dihydroxy-terminated polydimethylsiloxane with a functionality of 2, a number-average molecular weight of 2000 g / mol, a hydroxyl value of 56 mg KOH / g, and a viscosity of 2000 mPa·s at 25°C.

[0063] Step 2: Preparation of the bridging moisture-wicking functional body

[0064] Weigh out 27.0 g of L-aspartic acid and 0.6 mL of 85 wt% phosphoric acid and add them to the reaction vessel. Stir until homogeneous, then heat the reaction vessel to 195 °C and stir for 4.5 h. Continue the treatment at 20 kPa for 1.2 h. Then cool the reaction vessel to 60 °C, add 210.0 mL of dimethyl sulfoxide and stir until homogeneous. Then add 6.0 g of dopamine hydrochloride, 2.3 g of cysteine, 4.1 mL of 3-morpholinopropylamine and 12.0 mL of triethylamine in sequence. Stir for 9 h. Then add 3.6 g of 1,3-propanesulfonyl lactone and continue stirring for 7 h. After stirring, pour the reaction solution into anhydrous ethanol with twice the volume of the reaction solution to precipitate solids. Filter and collect the filter cake. Disperse the filter cake in deionized water with the same volume of the reaction solution and dialyze for 48 h. Then freeze-dry for 24 h to obtain the bridging moisture-wicking functional body.

[0065] Step 3: Preparation of antibacterial and breathable finishing agent

[0066] Weigh out 130.0 mL of anhydrous ethanol, 40.0 mL of deionized water, and 1.0 mL of glacial acetic acid and add them to a reaction vessel. Stir and mix thoroughly. Then add 6.0 mL of 3-aminopropyltriethoxysilane and 10.0 mL of tetraethyl orthosilicate. Stir at 30 °C for 50 min. Then add 11.0 mL of 50 wt% phytic acid solution and 5.0 g of tannic acid. Stir thoroughly and then add 3.3 g of zinc acetate dihydrate. Continue stirring for 70 min. After stirring, let stand at room temperature for 14 h to obtain an antibacterial and breathable finishing agent.

[0067] Step 4: Preparation of moisture-wicking and antibacterial elastic fibers

[0068] Weigh out 350.0 mL of N,N-dimethylformamide and add it to the spinning kettle. Stir, add 110.0 g of fiber-forming elastomer and stir to dissolve. After mixing evenly, add 14.0 g of bridging moisture-wicking functional material and continue stirring evenly. Then add 1.1 g of 2-hydroxy-2-methylphenylacetone. After degassing and filtration, wet spinning is performed. The nascent fiber is stretched 2.5 times in 65℃ warm water, then irradiated with 365nm ultraviolet light for 4 min, and then dried under 85℃ hot air for 12 min to obtain moisture-wicking and antibacterial elastic fiber with a diameter of 45 μm.

[0069] Step 5: Prepare moisture-wicking and antibacterial elastic fabric

[0070] Moisture-wicking and antibacterial elastic fibers are fed into a knitting machine for weaving. The yarn tension is controlled at 0.25 cN / dtex, the loop length is controlled at 0.32 cm, and the fabric surface density is controlled at 170 g / m². 2 The heat setting temperature is 110℃ and the heat setting time is 60s to obtain a moisture-wicking and antibacterial elastic fabric.

[0071] Step Six: Preparation of Antibacterial, Breathable, Elastic Fabric

[0072] Weigh out 320.0 mL of anhydrous ethanol, 720.0 mL of deionized water and 2.2 mL of glacial acetic acid and add them to the mixing tank. Stir and mix well. Then add 45.0 mL of antibacterial and breathable finishing agent and continue stirring until a composite finishing solution is obtained. Then immerse 60.0 g of moisture-wicking and antibacterial elastic fabric in the composite finishing solution for 5 min, with the liquid content controlled at 85%. Then pre-dry at 95℃ for 4 min and bake at 135℃ for 2.5 min. After standing at room temperature for 14 h, wash once with water at 50℃ and then dry at 65℃ to obtain antibacterial and breathable elastic fabric.

[0073] Example 3

[0074] This embodiment provides a method for preparing an antibacterial and breathable elastic fiber fabric, including the following steps:

[0075] Step 1: Preparation of fiber elastomer

[0076] Weigh out 120.0 mL of N,N-dimethylformamide, 2.9 g of bis(2-hydroxyethyl) disulfide and 3.5 mL of 3-allyloxy-1,2-propanediol and mix them to obtain a mixture.

[0077] Weigh out 35.5g of polytetrahydrofuran diol and 14.5g of hydroxyl-terminated polydimethylsiloxane and add them to a reaction vessel. Stir until homogeneous, then heat the reaction vessel to 105℃ and dehydrate under vacuum for 1.0h. Next, cool the reaction vessel to 73℃, add 12.0mL of isophorone diisocyanate and 0.04mL of dibutyltin dilaurate, and maintain the temperature and stir for 3h. Then add 57.5mL of the mixture to the reaction vessel and continue stirring at 58℃ for another 3.0h. After stirring, place the reaction solution at 65℃. The solvent was removed under vacuum for 5 hours to obtain a fiber-forming elastomer. The polytetrahydrofuran diol was a dihydroxy-terminated polytetrahydrofuran diol with a functionality of 2, a number-average molecular weight of 1200 g / mol, a hydroxyl value of 94 mg KOH / g, and a moisture content of no more than 0.05 wt%. The hydroxyl-terminated polydimethylsiloxane was a dihydroxy-terminated polydimethylsiloxane with a functionality of 2, a number-average molecular weight of 1800 g / mol, a hydroxyl value of 62 mg KOH / g, and a viscosity of 1500 mPa·s at 25°C.

[0078] Step 2: Preparation of the bridging moisture-wicking functional body

[0079] Weigh out 24.0 g of L-aspartic acid and 0.5 mL of 85 wt% phosphoric acid and add them to the reaction vessel. Stir until homogeneous, then heat the reaction vessel to 190 °C and stir for 4.0 h. Continue the treatment at 15 kPa for 1.0 h. Then cool the reaction vessel to 55 °C, add 195.0 mL of dimethyl sulfoxide and stir until homogeneous. Then add 5.0 g of dopamine hydrochloride, 2.1 g of cysteine, 3.6 mL of 3-morpholinopropylamine and 11.0 mL of triethylamine in sequence. Stir for 8 h. Then add 3.3 g of 1,3-propanesulfonyl lactone and continue stirring for 6 h. After stirring, pour the reaction solution into anhydrous ethanol with twice the volume of the reaction solution to precipitate solids. Filter and collect the filter cake. Disperse the filter cake in deionized water with the same volume of the reaction solution and dialyze for 36 h. Then freeze-dry for 21 h to obtain the bridging moisture-wicking functional body.

[0080] Step 3: Preparation of antibacterial and breathable finishing agent

[0081] Weigh out 125.0 mL of anhydrous ethanol, 38.0 mL of deionized water, and 1.0 mL of glacial acetic acid and add them to a reaction vessel. Stir and mix thoroughly. Then add 5.5 mL of 3-aminopropyltriethoxysilane and 9.0 mL of tetraethyl orthosilicate. Stir at 28 °C for 40 min. Then add 10.0 mL of 50 wt% phytic acid solution and 4.5 g of tannic acid. Stir thoroughly and then add 3.0 g of zinc acetate dihydrate. Continue stirring for 60 min. After stirring, let stand at room temperature for 12 h to obtain an antibacterial and breathable finishing agent.

[0082] Step 4: Preparation of moisture-wicking and antibacterial elastic fibers

[0083] Weigh 320.0 mL of N,N-dimethylformamide and add it to the spinning kettle. Stir, add 100.0 g of fiber-forming elastomer and stir to dissolve. After mixing evenly, add 12.0 g of bridging moisture-wicking functional material and continue stirring evenly. Then add 1.0 g of 2-hydroxy-2-methylphenylacetone. After degassing and filtration, wet spinning is performed. The nascent fiber is stretched 2.3 times in 63℃ warm water, then irradiated with 365nm ultraviolet light for 3 min, and then dried under 80℃ hot air for 10 min to obtain a moisture-wicking and antibacterial elastic fiber with a diameter of 40 μm.

[0084] Step 5: Prepare moisture-wicking and antibacterial elastic fabric

[0085] Moisture-wicking and antibacterial elastic fibers are fed into a knitting machine for weaving. The yarn tension is controlled at 0.22 cN / dtex, the loop length is controlled at 0.30 cm, and the fabric surface density is controlled at 160 g / m². 2 The heat setting temperature is 105℃ and the heat setting time is 50s to obtain a moisture-wicking and antibacterial elastic fabric.

[0086] Step Six: Preparation of Antibacterial, Breathable, Elastic Fabric

[0087] Weigh out 300.0 mL of anhydrous ethanol, 700.0 mL of deionized water and 2.0 mL of glacial acetic acid and add them to the mixing tank. Stir and mix well. Then add 40.0 mL of antibacterial and breathable finishing agent and continue stirring until a composite finishing solution is obtained. Then immerse 50.0 g of moisture-wicking and antibacterial elastic fabric in the composite finishing solution for 4 min, with the liquid retention rate controlled at 78%. Then pre-dry at 90℃ for 3 min and bake at 130℃ for 2.0 min. After standing at room temperature for 12 h, wash once with water at 45℃ and then dry at 60℃ to obtain antibacterial and breathable elastic fabric.

[0088] Comparative Example 1

[0089] The difference between this comparative example and Example 6 is that the bridging moisture-wicking function is removed in step four.

[0090] Comparative Example 2

[0091] The difference between this comparative example and Example 6 is that the antibacterial and breathable finishing agent is omitted in step six.

[0092] Comparative Example 3

[0093] The difference between this comparative example and Example 6 is that in step one, the addition of hydroxyl-terminated polydimethylsiloxane was omitted, and polytetrahydrofurandiol was used to replace hydroxyl-terminated polydimethylsiloxane in an equal amount.

[0094] Performance testing:

[0095] The performance tests of the antibacterial, breathable, and elastic fabric obtained in this application are divided into three categories, with a total of five performance data: antibacterial rate against Staphylococcus aureus, antibacterial rate against Escherichia coli, air permeability, moisture permeability, and elastic recovery rate after a single tensile test at 50% transverse elongation. Except for the antibacterial performance test, all other samples were conditioned for 24 hours at a temperature of 20±2℃ and a relative humidity of 65±4% according to GB / T 6529-2008 "Standard Atmospheres for Conditioning and Testing of Textiles". All samples were cut from the middle of the prepared antibacterial, breathable, and elastic fabric, more than 50mm from the selvage, avoiding creases, pinholes, stains, and areas with obvious unevenness in the fabric structure. Unless otherwise specified, parallel samples were used for each item, and the results were taken as the arithmetic mean.

[0096] The inhibition rates against Staphylococcus aureus and Escherichia coli were determined according to GB / T 20944.3-2008 "Evaluation of antimicrobial properties of textiles - Part 3: Shaking method";

[0097] The test parameters and procedures are as follows: The test samples were directly prepared using the antibacterial, breathable, and elastic fabrics obtained in Examples 1-3 and Comparative Examples 1-3; the control setup, antibacterial rate calculation, and result judgment were all performed according to GB / T 20944.3-2008; the test bacteria were Staphylococcus aureus ATCC 6538 and Escherichia coli ATCC 8739, respectively; three parallel samples were taken for each bacteria, and one 50mm × 50mm sample was cut from each parallel sample and placed in a 250mL sterile stoppered conical flask; after activating and amplifying the bacteria according to the standard method, a bacterial suspension was prepared using 0.03mol / L PBS buffer, and the working concentration of the bacterial suspension was controlled at 2.5 × 10⁻⁶. ^ 5-3.0×10^5 CFU / mL; Add 5.0 mL of the corresponding bacterial suspension to each conical flask containing the sample, and then place it in a constant temperature shaker at 24±1℃ and 150 r / min for 18 h; After shaking, take the test solution and perform serial dilution using the tenfold serial dilution method. Take the appropriate dilution and inoculate it onto nutrient agar plates. After incubation at 37±1℃ for 24 h, count the number of colonies, and calculate and judge the inhibition rate according to the standard. The test results are expressed as the inhibition rate of Staphylococcus aureus and the inhibition rate of Escherichia coli, respectively, with units of %.

[0098] Air permeability was determined according to GB / T 5453-1997 "Textiles - Determination of air permeability of fabrics";

[0099] The test parameters and procedures are as follows: The test equipment is a fabric air permeability tester, the test pressure difference is fixed at 100 Pa, and the test area is fixed at 20 cm². 2The antibacterial and breathable elastic fabrics prepared in Examples 1-3 and Comparative Examples 1-3 were cut into 120mm×120mm samples. Samples were taken evenly along the width and length directions, and a total of 10 parallel samples were taken. During the test, the front of the sample was facing the air inlet side and was held flat on the test head to ensure that the sample was wrinkle-free, loose, and airtight around the perimeter. The instrument was started one by one to perform the test, and the air velocity value passing vertically through the fabric was read. The test result is expressed as the air permeability, in mm / s.

[0100] The moisture permeability was determined according to GB / T 12704.1-2009 "Textiles - Test methods for moisture permeability of fabrics - Part 1: Moisture absorption method";

[0101] The test parameters and steps are as follows: The test method adopts the moisture-permeable cup absorption method. The antibacterial and breathable elastic fabrics prepared in Examples 1-3 and Comparative Examples 1-3 are cut to a uniform size of 100mm×100mm, and the effective test area is fixed at 33cm². 2 35.0±0.5g of pre-dried anhydrous calcium chloride was added to the permeation cup as a desiccant, and the sample periphery was sealed with a sealing ring and molten paraffin. The permeation cup was then placed in a constant temperature and humidity test chamber with fixed conditions of 38.0±0.5℃, relative humidity of 90.0±2.0%, and air velocity of 0.5m / s. After the sample was loaded into the cup, it was equilibrated for 1 hour, and then weighed every 1 hour for a total of 5 times. Three parallel samples were set up for each group. The permeability was calculated according to the standard based on the increase in mass of the permeation cup per unit time. The test result is expressed as permeability, with units of g / (m³). 2 •24h).

[0102] The transverse 50% constant elongation tensile elastic recovery rate was determined according to FZ / T 70006-2022 "Test Method for Tensile Elastic Recovery Rate of Knitted Fabrics";

[0103] The test parameters and steps are as follows: The test equipment is a CRE type electronic fabric strength tester, and the test method is the constant elongation method; the antibacterial and breathable elastic fabrics prepared in Examples 1-3 and Comparative Examples 1-3 are cut into 200mm×50mm samples in the transverse direction, and a total of 5 parallel samples are taken, with the clamping distance fixed at 100mm; after the samples are clamped, a pretension of 0.1N is applied to eliminate the initial relaxation, and then stretched to 50% constant elongation at a speed of 100mm / min and held for 60s; then unloaded to the initial position, and allowed to recover statically for 60s under no external load conditions, and then the transverse single tensile elastic recovery rate is calculated according to the standard. The test result is expressed as the transverse 50% constant elongation single tensile elastic recovery rate, in %, and the specific data are shown in Table 1;

[0104] Table 1 - Performance Test Data for Each Sample

[0105]

[0106] Data Analysis:

[0107] A comparative analysis of the data in Table 1 reveals that the antibacterial and breathable elastic fabric prepared in this invention exhibits a Staphylococcus aureus inhibition rate of 99.0%, an Escherichia coli inhibition rate of 98.4%, and an air permeability of 1201 mm·s. -1 The moisture permeability is 5702 g·(m³). 2 ·24h) -1 Meanwhile, the elastic recovery rate under a single tensile test at 50% constant elongation was 89.3%, and all data were superior to the comparative example, indicating that:

[0108] In Comparative Example 1, the original functional continuity within the fiber is weakened, making it difficult to form a complete transfer and connection relationship between the inside and outside of the fiber cross-section. Due to the lack of stable functional nodes in the internal structure that can cooperate with the fiber-forming elastomer, the migration process of moisture and heat within and between fibers is more likely to be dispersed and intermittent, further leading to inconsistent state responses between the fabric surface and the interior. At the same time, although the subsequent outer layer finishing interface still exists, it lacks effective interaction with the fiber interior, thus weakening the overall system's synergy from the inside out. Ultimately, this makes the sample more prone to local accumulation, uneven appearance, and insufficient maintenance of the overall state during comprehensive use.

[0109] In Comparative Example 2, the original functional interface of the fabric surface was insufficient, resulting in a lack of necessary transition and buffer layers between the internal fiber structure and the external environment. As the outer surface failed to form an interface order that matched the internal functional structure, the heat and moisture exchange process transferred from the inside to the surface could not be stably released on the fabric surface, thus interrupting the hierarchical coordination of the material system from the inside of the fiber to the surface of the fabric. Furthermore, the lack of the surface interface made the fabric more prone to surface state fluctuations during friction, skin contact, and repeated use, making it difficult to maintain a consistent working state between the inside and outside. Ultimately, this led to a decline in the overall composite performance of the sample, making it difficult to reflect the mutual support effect of the hierarchical structures in the example.

[0110] In Comparative Example 3, the structural coordination of the fiber elastomer was weakened, making it difficult for the fiber matrix to maintain the original balanced matching relationship when bearing the internal functional structure and adapting to the outer finishing interface. Due to the insufficient flexibility of the fiber continuous phase and the insufficient interface compliance, the fabric is more prone to local stress concentration and inconsistent structural response during stress, recovery and repeated deformation. This leads to a decrease in the synergistic maintenance ability between the internal functional areas and the surface functional areas of the fiber. At the same time, after the original flexible connection between the structural layers is lost, the material as a whole is more difficult to maintain a stable state under dynamic use conditions, ultimately resulting in a more obvious tendency of composite performance degradation under the combined effect of various wearing factors.

[0111] Ultimately, this demonstrates that the material units in this scheme are not isolated entities, but rather participate in different levels of operation, such as the construction of internal fiber transmission channels, the stable bearing of the matrix continuous phase, and the adjustment of the fabric surface interface. If any link is omitted or replaced, the chain of action from internal generation to surface release in the material system is interrupted to varying degrees, thus affecting the consistency of response between the fiber layer, interface layer, and fabric layer. This change is not simply a fluctuation in a single parameter, but rather a change in the synergistic maintenance ability of multiple wear-related functions under dynamic conditions. This reflects a close correspondence between the performance state presented by this scheme and the hierarchical connection, process coordination, and overall operational order formed by the components under specific configuration relationships.

[0112] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing an antibacterial and breathable elastic fiber fabric, characterized in that, Includes the following steps: S1. N,N-Dimethylformamide is added to the spinning kettle and stirred. Fiber-forming elastomer is added and stirred until dissolved. After mixing evenly, the bridging moisture-wicking functional material is added. After stirring evenly again, 2-hydroxy-2-methylphenylacetone is added. After degassing and filtration, wet spinning is performed. Post-treatment yields a moisture-wicking and antibacterial elastic fiber formed by composite molding of fiber-forming elastomer, bridging moisture-wicking functional substrate, and photoinitiator. A moisture-wicking and antibacterial elastic fabric is then woven. The fiber-forming elastomer is a polyurethane elastomer containing dynamic covalent bond units, unsaturated side chains, and flexible siloxane segments. S2. Add anhydrous ethanol, deionized water and glacial acetic acid to a mixing tank and stir. After mixing evenly, add an antibacterial and breathable finishing agent and continue stirring evenly to obtain a composite finishing solution. Then, immerse the moisture-wicking and antibacterial elastic fabric in the composite finishing solution and perform post-treatment to obtain an antibacterial and breathable elastic fabric obtained by impregnating and finishing the moisture-wicking and antibacterial elastic fabric with an antibacterial and breathable finishing substrate. The antibacterial and breathable finishing substrate is a composite finishing substrate containing a metal coordination structure, a polyphenol structure and a siloxane cross-linking network.

2. The method for preparing an antibacterial and breathable elastic fiber fabric according to claim 1, characterized in that, In step S1, the ratio of N,N-dimethylformamide, fiber-forming elastomer, bridging moisture-wicking functional agent, and 2-hydroxy-2-methylphenylacetone is 290-350 mL: 90-110 g: 10-14 g: 0.9-1.1 g; in step S2, the ratio of anhydrous ethanol, deionized water, glacial acetic acid, antibacterial and breathable finishing agent, and moisture-wicking and antibacterial elastic fabric is 280-320 mL: 680-720 mL: 1.8-2.2 mL: 35-45 mL: 40-60 g.

3. The method for preparing an antibacterial and breathable elastic fiber fabric according to claim 1, characterized in that, The preparation method of the fiber-forming elastomer is as follows: Polytetrahydrofuran diol and hydroxyl-terminated polydimethylsiloxane are added to a reaction vessel and stirred. After mixing evenly, the reaction vessel is heated to 100-110℃ and dehydrated under vacuum for 0.8-1.2h. Then, the reaction vessel is cooled to 70-75℃, isophorone diisocyanate and dibutyltin dilaurate are added, and the mixture is kept warm and stirred for 2-3h. The mixture is then added to the reaction vessel and kept warm and stirred at 55-60℃ for 2.5-3.5h. The fiber-forming elastomer is obtained after post-treatment. The ratio of polytetrahydrofuran diol, hydroxyl-terminated polydimethylsiloxane, isophorone diisocyanate, dibutyltin dilaurate, and the mixture is 32-39 g: 13-16 g: 10-14 mL: 0.02-0.05 mL: 55-60 mL. The mixture is obtained by mixing N,N-dimethylformamide, bis(2-hydroxyethyl) disulfide, and 3-allyloxy-1,2-propanediol in a ratio of 108-132 mL: 2.6-3.2 g: 3.1-3.9 mL.

4. The method for preparing an antibacterial and breathable elastic fiber fabric according to claim 1, characterized in that, The preparation method of the bridged moisture-wicking functional body is as follows: L-aspartic acid and 85wt% phosphoric acid are added to a reaction vessel and stirred. After mixing evenly, the reaction vessel is heated to 185-195℃ and kept at this temperature with stirring for 3.5-4.5h. Then, it is further treated under 10-20kPa conditions for 0.8-1.2h. Subsequently, the reaction vessel is cooled to 50-60℃, dimethyl sulfoxide is added and stirred evenly, and then dopamine hydrochloride, cysteine, 3-morpholinopropylamine and triethylamine are added sequentially. The mixture is kept at this temperature with stirring for 7-9h. Then 1,3-propanesulfonyl lactone was added, and the mixture was kept warm and stirred for another 5-7 hours. The post-treatment yielded the bridged moisture-wicking functional body. The ratio of L-aspartic acid, 85wt% phosphate, dimethyl sulfoxide, dopamine hydrochloride, cysteine, 3-morpholinopropylamine, triethylamine, and 1,3-propanesulfonyl lactone was 21-27g:0.4-0.6mL:180-210mL:4-6g:1.8-2.3g:3.1-4.1mL:10-12mL:2.9-3.6g.

5. The method for preparing an antibacterial and breathable elastic fiber fabric according to claim 1, characterized in that, The preparation method of the antibacterial and breathable finishing agent is as follows: anhydrous ethanol, deionized water and glacial acetic acid are added to a reaction vessel and stirred. After mixing evenly, 3-aminopropyltriethoxysilane and tetraethyl orthosilicate are added in sequence. The mixture is stirred at 25-30℃ for 30-50 min. Then, 50wt% phytic acid solution and tannic acid are added and stirred evenly. Zinc acetate dihydrate is added and stirred for another 50-70 min. After stirring, the mixture is allowed to stand at room temperature for 10-14 h to obtain the antibacterial and breathable finishing agent.

6. The method for preparing an antibacterial and breathable elastic fiber fabric according to claim 5, characterized in that, The ratio of anhydrous ethanol, deionized water, glacial acetic acid, 3-aminopropyltriethoxysilane, tetraethyl orthosilicate, 50wt% phytic acid solution, tannic acid, and zinc acetate dihydrate is 120-130mL:36-40mL:0.9-1.0mL:5-6mL:8-10mL:9-11mL:4-5g:2.7-3.3g.

7. An antibacterial and breathable elastic fiber fabric, characterized in that, The antibacterial and breathable elastic fiber fabric is prepared by the preparation method of the antibacterial and breathable elastic fiber fabric as described in any one of claims 1-6.

8. The application of an antibacterial and breathable elastic fiber fabric, characterized in that, The antibacterial and breathable elastic fiber fabric as described in any one of claims 1-6 is used in the preparation of underwear.

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