Fabric post-treatment method with long-acting antibacterial function and fabric

Abstract

The application relates to a fabric post-treatment method with long-term bacteriostatic function and a fabric, and the fabric post-treatment method comprises the following steps: (1) immersing fabric gray cloth into a modified chitosan antibacterial agent solution to perform padding treatment; (2) immersing the fabric gray cloth after the padding treatment in step (1) into a modified polycarboxylic acid crosslinking agent solution to perform padding treatment; (3) immersing the fabric gray cloth after the padding treatment in step (2) into a modified organic silicon hydrophilic softener solution to perform padding treatment, and the fabric post-treatment is completed. The fabric post-treatment method provided by the application realizes the synergistic effect of three modifiers, i.e., a modified chitosan antibacterial agent, a modified polycarboxylic acid crosslinking agent and a modified organic silicon hydrophilic softener, so that the fabric has excellent bacteriostatic rate and washing resistance, and the fabric after the post-treatment has soft hand feeling and good hydrophilicity, and the problems of poor antibacterial persistence, insufficient washing resistance and hard hand feeling of existing antibacterial fabrics are solved.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a fabric post-treatment method and fabric with long-lasting antibacterial function. Background Technology

[0002] Long-lasting antibacterial weft-knitted underwear fabric is a functional textile material that is given lasting antibacterial properties by fiber modification or functional finishing on the basis of conventional weft-knitted close-fitting fabric. It can effectively inhibit the growth of pathogenic bacteria on the surface of clothing, reduce the growth of odor caused by human sweat and sebum secretions, and reduce the probability of skin allergies, infections and inflammation. It can significantly improve the hygiene, safety and comfort of close-fitting clothing, and is therefore widely used in the field of underwear and close-fitting clothing.

[0003] In existing technologies, the long-lasting antibacterial function of underwear fabrics mostly relies on the chitosan antibacterial system. However, the traditional chitosan antibacterial agent and cotton fiber mainly rely on electrostatic adsorption and hydrogen bonding to form a bond with weak interfacial bonding strength and poor water washing performance. After multiple washes, the antibacterial activity of the fabric rapidly declines, and the antibacterial rate drops significantly, making it difficult to meet the requirements for long-lasting antibacterial use.

[0004] To address the insufficient washability of chitosan antibacterial layers, existing technologies typically employ high-temperature crosslinking agents such as butanetetracarboxylic acid (PTCA) for reinforcement. However, effective crosslinking requires baking at temperatures above 180°C. This high-temperature environment easily causes thermal shrinkage, elasticity damage, and overall yellowing and aging of the fabric's spandex components, severely compromising its original elasticity and appearance. Furthermore, during high-temperature crosslinking, the crosslinking agent undergoes an irreversible consumption reaction with the amino active sites of chitosan molecules, significantly reducing the antibacterial activity of chitosan. This results in a significant technical contradiction: antibacterial performance and washability cannot be simultaneously achieved. In addition, conventional antibacterial fabrics generally undergo a silicone softening finishing process. Traditional amino silicone oils are highly hydrophobic, easily forming a dense hydrophobic film on the fiber surface. This not only hinders the contact between antibacterial active ingredients and bacteria, weakening the antibacterial effect, but also significantly reduces the fabric's moisture absorption and wicking properties, causing a stuffy, sticky, and uncomfortable feeling when worn. Meanwhile, conventional cationic softeners and cationic chitosan antibacterial agents have a charge repulsion effect, which can easily cause uneven deposition of functional components, resulting in quality defects such as local stains and uneven hand feel in the fabric, which seriously affects the quality of the finished product and the user experience.

[0005] Therefore, how to provide a fabric that combines a durable, soft, hydrophilic feel with high antibacterial and washability has become an urgent problem to be solved. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a fabric post-treatment method and fabric with long-lasting antibacterial function, which effectively solves the problems of poor antibacterial durability, insufficient washability and stiff hand feel of existing antibacterial fabrics.

[0007] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a fabric post-treatment method with long-lasting antibacterial function, the fabric post-treatment method comprising: (1) Immerse the fabric in a modified chitosan antibacterial agent solution for padding treatment; (2) Immerse the fabric after the padding treatment in step (1) into the modified polycarboxylic acid crosslinking agent solution for padding treatment; (3) Immerse the fabric after the padding treatment in step (2) into the modified organosilicon hydrophilic softener solution for padding treatment to complete the fabric post-treatment.

[0008] This invention utilizes the synergistic effect of three modifiers: a modified chitosan antibacterial agent, a modified polycarboxylic acid crosslinking agent, and a modified silicone hydrophilic softener. The modified chitosan antibacterial agent imparts broad-spectrum antibacterial properties to the fabric; the modified polycarboxylic acid crosslinking agent enables the fabric to form chemical bonds with fibers and antibacterial agents at low temperatures, improving the fabric's antibacterial and wash resistance; and the modified silicone hydrophilic softener provides the fabric with a lasting hydrophilic and soft feel without sacrificing the antibacterial effect.

[0009] Preferably, the modified chitosan antibacterial agent solution comprises a modified chitosan antibacterial agent and solvent A.

[0010] Preferably, the mass fraction of the modified chitosan antibacterial agent in the modified chitosan antibacterial agent solution is 0.5-2%, for example, it can be 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8% or 2%, etc.

[0011] Preferably, solvent A comprises water.

[0012] Preferably, the raw materials for preparing the modified chitosan antibacterial agent include chitosan, initiator, modifier, and nano-metal oxide.

[0013] Preferably, the initiator includes a free radical initiator.

[0014] Preferably, the free radical initiator comprises ammonium persulfate.

[0015] Preferably, the modifier comprises an unsaturated carboxylic acid or a derivative thereof.

[0016] Preferably, the unsaturated carboxylic acid or its derivatives include maleic anhydride.

[0017] Preferably, the D50 particle size of the nano-metal oxide is 20-50 nm, for example, it can be 20 nm, 30 nm, 40 nm or 50 nm.

[0018] Preferably, the D90 particle size of the nano-metal oxide is <80 nm, for example, it can be 60 nm, 65 nm, 70 nm, 75 nm or 80 nm.

[0019] Preferably, the nano-metal oxide includes nano-zinc oxide.

[0020] Preferably, the mass ratio of chitosan, initiator, modifier and nano metal oxide is 1:(0.005-0.015):(0.25-0.5):(0.04-0.06).

[0021] Among them, 0.005-0.015 can be, for example, 0.005, 0.006, 0.008, 0.01, 0.012, 0.014 or 0.015, etc.; 0.25-0.5 can be, for example, 0.25, 0.3, 0.35, 0.4, 0.45 or 0.5, etc.; 0.04-0.06 can be, for example, 0.04, 0.045, 0.05, 0.055 or 0.06, etc.

[0022] Preferably, the modified chitosan antibacterial agent is prepared by pre-activating chitosan with an initiator, grafting it with a modifier, and then compounding it with nano-metal oxides.

[0023] This invention first utilizes a free radical initiator to generate free radical active sites on the chitosan molecular chain, and then introduces a large number of carboxyl groups through grafting of unsaturated carboxylic acids or their derivatives, transforming chitosan from a poorly soluble cationic polymer into a water-soluble amphoteric polymer with both carboxyl and amino groups. This not only retains the antibacterial activity of protonated amino groups, but also provides a chemical anchor for reaction with subsequent crosslinking agents. Simultaneously, nano-metal oxides are uniformly dispersed in the modified chitosan matrix through physical composite, and the slow release of metal ions and the contact sterilization of chitosan form a dual antibacterial effect. This differs from existing antibacterial agents that rely solely on physical mixing or ion adsorption. After baking, the modified chitosan forms preliminary hydrogen bonds and electrostatic bonds with the fiber. During subsequent crosslinking and fixation, the grafted carboxyl groups can covalently esterify with the modified polycarboxylic acid crosslinking agent, locking the antibacterial agent onto the fiber surface.

[0024] Preferably, the modified chitosan antibacterial agent is prepared by the following method: (A1) Chitosan and initiator are mixed for pre-activation; (A2) After the reaction described in step (A1) is completed, add the modifier and continue the reaction; (A3) After the reaction described in step (A2) is completed, nano-metal oxide is added and mixed to obtain the modified chitosan antibacterial agent.

[0025] Preferably, the chitosan in step (A1) is dissolved in an acidic solvent to prepare a chitosan solution with a mass fraction of 3-5% (e.g., 3%, 3.5%, 4%, 4.5%, or 5%), and then mixed with an initiator.

[0026] Preferably, the acidic solvent comprises an aqueous solution of acetic acid with a mass fraction of 1-3% (e.g., 1%, 1.5%, 2%, 2.5%, or 3%).

[0027] Preferably, the pre-activation temperature in step (A1) is 40-60℃ (e.g., 40℃, 45℃, 50℃, 55℃ or 60℃, etc.), and the pre-activation time is 25-35 min (e.g., 25 min, 26 min, 28 min, 30 min, 32 min, 34 min or 35 min, etc.).

[0028] Preferably, the preactivation in step (A1) is carried out in an inert gas atmosphere, wherein the inert gas includes nitrogen.

[0029] Preferably, the temperature of the reaction in step (A2) is 60-80℃ (e.g., 60℃, 65℃, 70℃, 75℃ or 80℃, etc.), and the reaction time is 2-4 h (e.g., 2 h, 2.5 h, 3 h, 3.5 h or 4 h, etc.).

[0030] Preferably, the nano-metal oxide in step (A3) is dispersed in solvent B to prepare a nano-metal oxide dispersion with a mass fraction of 1-3% (e.g., 1%, 1.5%, 2%, 2.5%, or 3%).

[0031] Preferably, solvent B comprises water.

[0032] Preferably, the nano-metal oxide is dispersed in solvent B, and the dispersion is carried out by ultrasound for a time of 20-30 min (e.g., 20 min, 22 min, 24 min, 25 min, 26 min, 28 min, or 30 min, etc.).

[0033] Preferably, the mixing temperature in step (A3) is 25-35℃ (e.g., 25℃, 26℃, 28℃, 30℃, 32℃, 34℃ or 35℃, etc.), and the mixing time is 1-2 h (e.g., 1 h, 1.2 h, 1.4 h, 1.5 h, 1.6 h, 1.8 h or 2 h, etc.).

[0034] Preferably, after the mixing in step (A3) is completed, the steps of filtering, washing and freeze-drying are also included.

[0035] Preferably, the modified polycarboxylate crosslinking agent solution comprises a modified polycarboxylate crosslinking agent and solvent C.

[0036] Preferably, the mass fraction of the modified polycarboxylic acid crosslinking agent in the modified polycarboxylic acid crosslinking agent solution is 1-3%, for example, it can be 1%, 1.5%, 2%, 2.5% or 3%, etc.

[0037] Preferably, the solvent C comprises water.

[0038] Preferably, the raw materials for preparing the modified polycarboxylic acid crosslinking agent include acid monomers, alcohol monomers, and internal plasticizers.

[0039] Preferably, the acid monomer comprises butanetetracarboxylic acid.

[0040] Preferably, the alcohol monomer includes citric acid.

[0041] Preferably, the internal plasticizer comprises polyethylene glycol.

[0042] Preferably, the number average molecular weight of the polyethylene glycol is 300-500 g / mol, for example, it can be 300 g / mol, 350 g / mol, 400 g / mol, 450 g / mol or 500 g / mol.

[0043] Preferably, the mass ratio of the acid monomer, alcohol monomer, and internal plasticizer is 1:(0.16-0.34):(0.083-0.125).

[0044] Among them, 0.16-0.34 can be, for example, 0.16, 0.18, 0.2, 0.22, 0.24, 0.25, 0.26, 0.28, 0.3, 0.32 or 0.34, etc.; 0.083-0.125 can be, for example, 0.083, 0.085, 0.09, 0.095, 0.1, 0.105, 0.11, 0.115, 0.12 or 0.125, etc.

[0045] Preferably, the modified polycarboxylic acid crosslinking agent is obtained by partial esterification of acid monomers and alcohol monomers, followed by internal plasticizing with an internal plasticizer.

[0046] The modified polycarboxylic acid crosslinking agent provided by this invention is a prepolymer formed by the partial esterification reaction of acid monomers and alcohol monomers. It contains a large number of free carboxyl groups and flexible polyether segments. Unlike the existing technology that directly uses butanetetracarboxylic acid and requires high-temperature baking at 180°C, which causes heat damage to spandex, this invention can achieve esterification crosslinking at 160-170°C due to the synergistic cooling effect of alcohol monomers and the catalytic effect of crosslinking catalyst. The baking temperature is lower, the shrinkage rate of spandex is reduced, and the elasticity retention rate of the fabric is improved. At the same time, an internal plasticizer is further introduced. The introduction of its internal plasticizing segments makes the crosslinking network flexible, avoiding the defects of stiff fabric and rough hand feel caused by single butanetetracarboxylic acid crosslinking. In the modified polycarboxylic acid crosslinking agent, the free carboxyl groups preferentially react with the hydroxyl groups of cotton fibers in the fabric, while the amino groups on the modified chitosan antibacterial agent are partially protected by protonation during baking, avoiding indiscriminate amidation, which would lead to a decrease in antibacterial performance.

[0047] Preferably, the modified polycarboxylate crosslinking agent solution is prepared by the following method: (B1) Mix the acid monomer and alcohol monomer to carry out a partial esterification reaction; (B2) After the reaction described in step (B1) is completed, add an internal plasticizer and continue the reaction to obtain the modified polycarboxylic acid crosslinking agent solution.

[0048] Preferably, the acid monomer is dissolved in solvent D to prepare an acid monomer solution with a mass fraction of 10-20% (e.g., 10%, 12%, 14%, 15%, 16%, 18%, or 20%), which is then mixed with the crosslinking catalyst to obtain a mixed solution. The pH value of the mixed solution is then adjusted to 4-5 (e.g., pH=4, pH=4.2, pH=4.4, pH=4.5, pH=4.6, pH=4.8, or pH=5) by a pH adjuster before being mixed with the alcohol monomer.

[0049] Preferably, the mass ratio of the acid monomer to the crosslinking catalyst is 1:(0.1-0.34), for example, it can be 1:0.1, 1:0.15, 1:0.2, 1:0.25, 1:0.3 or 1:0.34, etc.

[0050] Preferably, the crosslinking catalyst comprises sodium hypophosphite.

[0051] Preferably, the solvent D comprises water.

[0052] Preferably, the pH adjuster comprises an aqueous solution of sodium hydroxide with a mass fraction of 8-12% (e.g., 8%, 9%, 10%, 11%, or 12%).

[0053] Preferably, the temperature of the partial esterification reaction in step (B1) is 70-90°C (e.g., 70°C, 75°C, 80°C, 85°C, or 90°C), and the time of the partial esterification reaction is 1-2 h (e.g., 1 h, 1.2 h, 1.4 h, 1.5 h, 1.6 h, 1.8 h, or 2 h).

[0054] Preferably, the esterification rate of the partial esterification reaction in step (B1) is 20-40%, for example, it can be 20%, 25%, 30%, 35% or 40%, etc.

[0055] The esterification rate test method is as follows: Sampling: Take W grams of the reaction solution sample after the esterification reaction in step (B1) and place it in an Erlenmeyer flask; Determination of free carboxyl group content: Using phenolphthalein as an indicator, titrate the sample to the endpoint with a sodium hydroxide standard solution of concentration C (mol / L) (the solution turns slightly red and does not fade after 30 s), and record the volume of sodium hydroxide standard solution consumed, V1 (mL). At the same time, use unreacted acid monomer raw material as a blank control and record the blank consumption volume, V0 (mL); Esterification rate calculation: Initial free carboxyl group content (mmol / g) = C × V0 / W; The content of free carboxyl groups after the reaction (mmol / g) = C × V1 / W; Esterification rate (%) = (Initial free carboxyl content - Post-reaction free carboxyl content) / Initial free carboxyl content × 100%.

[0056] Preferably, after the partial esterification reaction in step (B1), the reaction system is cooled to 50-60°C, for example, 50°C, 52°C, 54°C, 55°C, 56°C, 58°C, or 60°C.

[0057] Preferably, the reaction temperature in step (B2) is 50-60℃ (e.g., 50℃, 52℃, 54℃, 55℃, 56℃, 58℃ or 60℃, etc.), and the reaction time is 30-40 min, e.g., 30 min, 32 min, 34 min, 35 min, 36 min, 38 min or 40 min, etc.

[0058] Preferably, after the reaction in step (B2) is completed, a cooling and drying step is also included.

[0059] Preferably, the modified silicone hydrophilic softener solution comprises a modified silicone hydrophilic softener and solvent E.

[0060] Preferably, the mass fraction of the modified silicone hydrophilic softener in the modified silicone hydrophilic softener solution is 1-3%, for example, it can be 1%, 1.5%, 2%, 2.5% or 3%, etc.

[0061] Preferably, the solvent E comprises water.

[0062] Preferably, the raw materials for preparing the modified organosilicon hydrophilic softener include an organosilicon matrix, an epoxy hydrophilic modifier, a cationic antibacterial component, and a capping crosslinking agent.

[0063] Preferably, the organosilicon matrix comprises amino silicone oil.

[0064] Preferably, the epoxy hydrophilic modifier comprises epoxy polyether.

[0065] Preferably, the cationic antibacterial component comprises quaternary ammonium salt glycidyl ether.

[0066] Preferably, the end-capping crosslinking agent comprises isocyanate propylenetrimethoxysilane.

[0067] Preferably, the mass ratio of the organosilicon matrix, epoxy hydrophilic modifier, cationic antibacterial component and end-capping crosslinking agent is 1:(0.125-0.25):(0.1-0.2):(0.03-0.05).

[0068] Among them, 0.125-0.25 can be, for example, 0.125, 0.14, 0.15, 0.16, 0.18, 0.2, 0.22, 0.24 or 0.25, etc.; 0.1-0.2 can be, for example, 0.1, 0.12, 0.14, 0.15, 0.16, 0.18 or 0.2, etc.; 0.03-0.05 can be, for example, 0.03, 0.035, 0.04, 0.045 or 0.05, etc.

[0069] Preferably, the modified organosilicon hydrophilic softener is obtained by grafting an epoxy hydrophilic modifier onto an organosilicon matrix, introducing cationic antibacterial groups with cationic antibacterial components, and then sealing and crosslinking with a sealing and crosslinking agent.

[0070] In this invention, the modified silicone hydrophilic softener introduces hydrophilic segments into the silicone matrix through ring-opening with an epoxy hydrophilic modifier, transforming the originally hydrophobic silicone matrix into a self-emulsifying, highly hydrophilic softener, reducing the contact angle and fabric absorbency time. Subsequently, the cationic antibacterial groups of the cationic antibacterial component further endow the softener with cationic antibacterial properties, and form a charge-complementary rather than repulsive relationship with the modified chitosan. After crosslinking, some amino groups of chitosan are consumed, and its positive charge decreases, while the positive charge of the cationic antibacterial groups compensates for the surface antibacterial density. Furthermore, due to their different steric hindrances, the two act on the inner and outer layers of the fiber respectively, avoiding deposition competition. Finally, the end-capping crosslinking treatment of the end-capping crosslinking agent enables the softener to form a self-crosslinking network through siloxane hydrolysis and condensation during setting and drying, which interpenetrates with the ester bond network already established by the polycarboxylic acid crosslinking agent, jointly anchoring the antibacterial agent.

[0071] Preferably, the modified organosilicon hydrophilic softener is prepared by the following method: (C1) The organosilicon matrix and the epoxy hydrophilic modifier are mixed and reacted; (C2) After the reaction described in step (C1) is completed, add the cationic antibacterial component and continue the reaction; (C3) After the reaction described in step (C2) is completed, add the end-capping crosslinking agent and carry out the reaction to obtain the modified organosilicon hydrophilic softener.

[0072] Preferably, the organosilicon matrix described in step (C1) is dissolved in solvent F to prepare an organosilicon matrix solution with a mass fraction of 20-30%, which is then mixed with an epoxy hydrophilic modifier.

[0073] Preferably, the solvent F comprises anhydrous isopropanol.

[0074] Preferably, the temperature of the reaction in step (C1) is 80-100℃ (e.g., 80℃, 85℃, 90℃, 95℃ or 100℃, etc.), and the reaction time is 3-5 h (e.g., 3 h, 3.5 h, 4 h, 4.5 h or 5 h, etc.).

[0075] Preferably, after the reaction in step (C1), the reaction system is cooled to 60-80°C, for example, 60°C, 65°C, 70°C, 75°C or 80°C.

[0076] Preferably, the reaction temperature in step (C2) is 60-80℃ (e.g., 60℃, 65℃, 70℃, 75℃ or 80℃, etc.), and the reaction time is 2-4 h, e.g., 2 h, 2.5 h, 3 h, 3.5 h or 4 h, etc.

[0077] Preferably, after the reaction in step (C2), the reaction system is cooled to 40-50°C, for example, 40°C, 42°C, 44°C, 45°C, 46°C, 48°C, or 50°C.

[0078] Preferably, the reaction temperature in step (C3) is 40-50℃ (e.g., 40℃, 42℃, 44℃, 45℃, 46℃, 48℃ or 50℃, etc.), and the reaction time is 1-2 h, e.g., 1 h, 1.2 h, 1.4 h, 1.5 h, 1.6 h, 1.8 h or 2 h, etc.

[0079] Preferably, the reactions described in steps (C1), (C2), and (C3) are each carried out independently in an inert gas atmosphere, wherein the inert gas includes nitrogen.

[0080] Preferably, after the reaction in step (C3) is completed, a step of removing the solvent is also included.

[0081] Preferably, the immersion and rolling process in step (1) is one immersion and one rolling.

[0082] Preferably, the rolling residue rate of the impregnation process in step (1) is 70-90%, for example, it can be 70%, 75%, 80%, 85% or 90%, etc.

[0083] Preferably, the impregnation and rolling process in step (1) further includes a baking step.

[0084] Preferably, the baking temperature is 80-100℃ (e.g., 80℃, 85℃, 90℃, 95℃ or 100℃, etc.), and the baking time is 1-2 min, e.g., 1 min, 1.2 min, 1.4 min, 1.5 min, 1.6 min, 1.8 min or 2 min, etc.

[0085] Preferably, the immersion rolling process in step (2) is a two-immersion and two-roll process.

[0086] Preferably, the rolling residue rate of the impregnation process in step (2) is 70-85%, for example, it can be 70%, 72%, 74%, 75%, 76%, 78%, 80%, 82%, 84% or 85%, etc.

[0087] Preferably, step (2) further includes a baking step after the impregnation and rolling process.

[0088] Preferably, the baking temperature is 160-180℃ (e.g., 160℃, 165℃, 170℃, 175℃ or 180℃, etc.), and the baking time is 1-3 min (e.g., 1 min, 1.5 min, 2 min, 2.5 min or 3 min, etc.).

[0089] Preferably, the immersion rolling process in step (3) is a two-immersion and two-roll process.

[0090] Preferably, the rolling residue rate of the impregnation process in step (3) is 60-80%, for example, it can be 60%, 65%, 70%, 75% or 80%, etc.

[0091] Preferably, step (3) further includes a shaping and drying step after the padding process.

[0092] Preferably, the temperature for shaping and drying is 120-150℃ (e.g., 120℃, 130℃, 140℃ or 150℃, etc.), and the drying time is 3-5 min (e.g., 3 min, 3.5 min, 4 min, 4.5 min or 5 min, etc.).

[0093] Secondly, the present invention provides an underwear fabric, which is obtained by post-processing the fabric post-processing method described in the first aspect.

[0094] Compared with the prior art, the present invention has at least the following beneficial effects: The fabric post-treatment method provided by this invention uses three modifiers—modified chitosan antibacterial agent, modified polycarboxylic acid crosslinking agent, and modified organosilicon hydrophilic softener—to work synergistically, giving the fabric excellent antibacterial rate and washability. Furthermore, the post-treated fabric has a soft hand feel and good hydrophilicity, solving the problems of poor antibacterial durability, insufficient washability, and stiff hand feel of existing antibacterial fabrics. Detailed Implementation

[0095] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0096] The specific information of the materials used in the following specific embodiments of the present invention is as follows: Chitosan: Industrial grade (degree of deacetylation ≥80%), purchased from Weihai Disha Marine Products Co., Ltd. Nano zinc oxide: ZH-ZnO50N (D50 average particle size of 50 nm, purity ≥99.9%, near spherical), purchased from Hefei Zhonghang Nanotechnology Development Co., Ltd.; Polyethylene glycol: Polyethylene glycol 400, purchased from Nanjing Runbang Chemical Co., Ltd.; Amino silicone oil: JY-203, purchased from Changzhou Juyou New Material Technology Co., Ltd.; Epoxy polyether: IOTA ESM31, purchased from Anhui Aiyota Silicone Oil Co., Ltd.; Quaternary ammonium salt glycidyl ether: purchased from Yixing Kailida Chemical Co., Ltd.; Propylene trimethoxysilane isocyanate: BR grade (95% purity), purchased from TCI (Shanghai) Chemical Industry Development Co., Ltd. Fabric: Cotton / spandex weft-knitted fabric, purchased from Guangdong Derun Textile Co., Ltd.

[0097] Example 1 This embodiment provides a fabric post-processing method, the fabric post-processing method including: (1) The fabric was immersed in a modified chitosan antibacterial agent solution (the mass fraction of the modified chitosan antibacterial agent was 0.5%) and subjected to padding treatment. After one immersion and one padding, the padding rate was 70%. After padding treatment, it was baked at 80°C for 1 min. (2) The fabric after the padding treatment in step (1) is immersed in the modified polycarboxylic acid crosslinking agent solution (the mass fraction of the modified polycarboxylic acid crosslinking agent is 1%) and padded. After two dips and two rolls, the roll residue rate is 70%. After padding treatment, it is baked at 160°C for 1 min. (3) The fabric after the padding treatment in step (2) is immersed in a modified silicone hydrophilic softener solution (the mass fraction of the modified silicone hydrophilic softener is 1%) for padding treatment. After two dips and two rolls, the roll residue rate is 60%. After padding treatment, the fabric is shaped and dried at 120°C for 3 min to complete the post-treatment of the fabric.

[0098] The modified chitosan antibacterial agent was prepared by the following method: (A1) Dissolve chitosan in a 1% acetic acid aqueous solution to prepare a 3% chitosan solution, then mix it with ammonium persulfate (the mass ratio of chitosan to ammonium persulfate is 1:0.005) and pre-activate it for 25 min at 40°C under nitrogen protection. (A2) After the reaction described in step (A1) is completed, add maleic anhydride (the mass ratio of chitosan to maleic anhydride is 1:0.5) and react at 60°C for 2 h; (A3) Disperse nano zinc oxide in water (the mass ratio of chitosan to nano zinc oxide is 1:0.04), ultrasonically disperse for 20 min, prepare a nano zinc oxide dispersion with a mass fraction of 1%, and then mix it with the reaction system obtained in step (A2). Mix at 25°C for 1 h. After mixing, filter, wash and freeze dry to obtain the modified chitosan antibacterial agent.

[0099] The modified polycarboxylate crosslinking agent was prepared by the following method: (B1) Dissolve butanetetracarboxylic acid in water to prepare a 10% butanetetracarboxylic acid solution, then add sodium hypophosphite (mass ratio of butanetetracarboxylic acid to sodium hypophosphite is 1:0.2) and mix. Stir until completely dissolved, then adjust the pH of the mixture to 4.0 with a 10% sodium hydroxide solution. Then add citric acid (mass ratio of butanetetracarboxylic acid to citric acid is 1:0.33) to the mixture and react at 70°C for 1 h until the esterification rate reaches 20%. Then cool the reaction system to 50°C. (B2) Polyethylene glycol 400 (butanetetracarboxylic acid and polyethylene glycol in a mass ratio of 1:0.125) was added to the reaction system obtained in step (B1), and the reaction was carried out at 50°C for 30 min. After the reaction was completed, the reaction system was cooled to 25°C and then dried to obtain the modified polycarboxylic acid crosslinking agent.

[0100] The modified organosilicon hydrophilic softener was prepared by the following method: (C1) Dissolve amino silicone oil (JY-203) in anhydrous isopropanol to prepare an amino silicone oil solution with a mass fraction of 20%. Under nitrogen protection, heat the amino silicone oil solution to 80°C and add epoxy polyether (IOTA ESM31, with a mass ratio of amino silicone oil to epoxy polyether of 1:0.25). React for 3 h. After the reaction is completed, cool the reaction system to 60°C. (C2) Add quaternary ammonium salt glycidyl ether (the mass ratio of amino silicone oil to quaternary ammonium salt glycidyl ether is 1:0.2) to the reaction system obtained in step (C1), react at 60°C for 2 h, and after the reaction is completed, cool the reaction system to 40°C; (C3) Under anhydrous and nitrogen protection conditions, isocyanate propylene trimethoxysilane (the mass ratio of amino silicone oil to isocyanate propylene trimethoxysilane is 1:0.03) is added dropwise to the reaction system obtained in step (C2), and the reaction is carried out at 40°C for 1 h. After the reaction is completed, anhydrous isopropanol is removed by vacuum distillation to obtain modified organosilicon hydrophilic softener.

[0101] Example 2 This embodiment provides a fabric post-processing method, the fabric post-processing method including: (1) The fabric was immersed in a modified chitosan antibacterial agent solution (the mass fraction of modified chitosan antibacterial agent was 1.2%) and subjected to padding treatment. After one immersion and one padding, the padding rate was 80%. After padding treatment, it was baked at 90°C for 1.5 min. (2) The fabric after the padding treatment in step (1) is immersed in the modified polycarboxylic acid crosslinking agent solution (the mass fraction of the modified polycarboxylic acid crosslinking agent is 2%) and subjected to padding treatment. After two dips and two rolls, the roll residue rate is 77%. After padding treatment, it is baked at 170°C for 2 min. (3) The fabric after the padding treatment in step (2) is immersed in a modified silicone hydrophilic softener solution (the mass fraction of the modified silicone hydrophilic softener is 2%) for padding treatment. After two dips and two rolls, the roll residue rate is 70%. After padding treatment, the fabric is shaped and dried at 135°C for 4 min to complete the post-treatment of the fabric.

[0102] The modified chitosan antibacterial agent was prepared by the following method: (A1) Dissolve chitosan in a 2% acetic acid aqueous solution to prepare a 4% chitosan solution, then mix it with ammonium persulfate (the mass ratio of chitosan to ammonium persulfate is 1:0.01) and pre-activate it for 30 min at 50°C under nitrogen protection. (A2) After the reaction described in step (A1) is completed, add maleic anhydride (the mass ratio of chitosan to maleic anhydride is 1:0.33) and react at 70°C for 3 h; (A3) Disperse nano zinc oxide in water (the mass ratio of chitosan to nano zinc oxide is 1:0.05), ultrasonically disperse for 25 min, prepare a nano zinc oxide dispersion with a mass fraction of 2%, and then mix it with the reaction system obtained in step (A2). React at 30°C for 1.5 h. After the reaction is completed, filter, wash and freeze dry to obtain the modified chitosan antibacterial agent.

[0103] The modified polycarboxylate crosslinking agent was prepared by the following method: (B1) Dissolve butanetetracarboxylic acid in water to prepare a 15% butanetetracarboxylic acid solution, then add sodium hypophosphite (mass ratio of butanetetracarboxylic acid to sodium hypophosphite is 1:0.13) and mix. Stir until completely dissolved, then adjust the pH of the mixture to 4.5 with a 10% sodium hydroxide solution. Then add citric acid (mass ratio of butanetetracarboxylic acid to citric acid is 1:0.22) to the mixture and react at 80°C for 1.5 h until the esterification rate reaches 30%. Then cool the reaction system to 55°C. (B2) Polyethylene glycol 400 (butanetetracarboxylic acid and polyethylene glycol in a mass ratio of 1:0.1) is added to the reaction system obtained in step (B1), and the reaction is carried out at 55°C for 35 min. After the reaction is completed, the reaction system is cooled to 30°C and then dried to obtain the modified polycarboxylic acid crosslinking agent.

[0104] The modified organosilicon hydrophilic softener was prepared by the following method: (C1) Dissolve amino silicone oil (JY-203) in anhydrous isopropanol to prepare an amino silicone oil solution with a mass fraction of 25%. Under nitrogen protection, heat the amino silicone oil solution to 90°C and add epoxy polyether (IOTA ESM31, the mass ratio of amino silicone oil to epoxy polyether is 1:0.167). React for 4 h. After the reaction is completed, cool the reaction system to 70°C. (C2) Add quaternary ammonium salt glycidyl ether (the mass ratio of amino silicone oil to quaternary ammonium salt glycidyl ether is 1:0.13) to the reaction system obtained in step (C1), react at 70°C for 3 h, and after the reaction is completed, cool the reaction system to 45°C; (C3) Under anhydrous and nitrogen protection conditions, isocyanate propylene trimethoxysilane (the mass ratio of amino silicone oil to isocyanate propylene trimethoxysilane is 1:0.04) is added dropwise to the reaction system obtained in step (C2), and the reaction is carried out at 45°C for 1.5 h. After the reaction is completed, anhydrous isopropanol is removed by vacuum distillation to obtain modified organosilicon hydrophilic softener.

[0105] Example 3 This embodiment provides a fabric post-processing method, the fabric post-processing method including: (1) The fabric was immersed in a modified chitosan antibacterial agent solution (the mass fraction of modified chitosan antibacterial agent was 2%) and subjected to padding treatment. After one immersion and one padding, the padding rate was 90%. After padding treatment, it was baked at 100℃ for 2 min. (2) The fabric after the padding treatment in step (1) is immersed in the modified polycarboxylic acid crosslinking agent solution (the mass fraction of the modified polycarboxylic acid crosslinking agent is 3%) and subjected to padding treatment. After two dips and two rolls, the roll residue rate is 85%. After padding treatment, it is baked at 180°C for 3 min. (3) The fabric after the padding treatment in step (2) is immersed in a modified silicone hydrophilic softener solution (the mass fraction of the modified silicone hydrophilic softener is 3%) for padding treatment. After two dips and two rolls, the roll residue rate is 80%. After padding treatment, the fabric is shaped and dried at 150°C for 5 min to complete the post-treatment of the fabric.

[0106] The modified chitosan antibacterial agent was prepared by the following method: (A1) Dissolve chitosan in a 3% acetic acid aqueous solution to prepare a 5% chitosan solution, then mix it with ammonium persulfate (the mass ratio of chitosan to ammonium persulfate is 1:0.015) and pre-activate it for 35 min at 60°C under nitrogen protection. (A2) After the reaction described in step (A1) is completed, add maleic anhydride (the mass ratio of chitosan to maleic anhydride is 1:0.25) and react at 80°C for 4 h; (A3) Disperse nano zinc oxide in water (the mass ratio of chitosan to nano zinc oxide is 1:0.06), ultrasonically disperse for 30 min, prepare a nano zinc oxide dispersion with a mass fraction of 3%, and then mix it with the reaction system obtained in step (A2). React at 35°C for 2 h. After the reaction is completed, filter, wash and freeze dry to obtain the modified chitosan antibacterial agent.

[0107] The modified polycarboxylate crosslinking agent was prepared by the following method: (B1) Dissolve butanetetracarboxylic acid in water to prepare a 20% butanetetracarboxylic acid solution, then add sodium hypophosphite (mass ratio of butanetetracarboxylic acid to sodium hypophosphite is 1:0.1) and mix. Stir until completely dissolved, then adjust the pH of the mixture to 5 with a 10% sodium hydroxide solution. Then add citric acid (mass ratio of butanetetracarboxylic acid to citric acid is 1:0.167) to the mixture and react at 90°C for 2 h until the esterification rate reaches 40%. Then cool the reaction system to 60°C. (B2) Polyethylene glycol 400 (butanetetracarboxylic acid and polyethylene glycol in a mass ratio of 1:0.083) was added to the reaction system obtained in step (B1), and the reaction was carried out at 60°C for 40 min. After the reaction was completed, the reaction system was cooled to 35°C and then dried to obtain the modified polycarboxylic acid crosslinking agent.

[0108] The modified organosilicon hydrophilic softener was prepared by the following method: (C1) Dissolve amino silicone oil (JY-203) in anhydrous isopropanol to prepare an amino silicone oil solution with a mass fraction of 30%. Under nitrogen protection, heat the amino silicone oil solution to 100°C and add epoxy polyether dropwise (mass ratio of amino silicone oil to epoxy polyether is 1:0.125). Keep the reaction at this temperature for 5 h. After the reaction is completed, cool the reaction system to 80°C. (C2) Add quaternary ammonium salt glycidyl ether (IOTA ESM31, the mass ratio of amino silicone oil to quaternary ammonium salt glycidyl ether is 1:0.1) to the reaction system obtained in step (C1), react at 80℃ for 4 h, and after the reaction is completed, cool the reaction system to 50℃. (C3) Under anhydrous and nitrogen protection conditions, isocyanate propylene trimethoxysilane (the mass ratio of amino silicone oil to isocyanate propylene trimethoxysilane is 1:0.05) is added dropwise to the reaction system obtained in step (C2), and the reaction is carried out at 50°C for 2 h. After the reaction is completed, anhydrous isopropanol is removed by vacuum distillation to obtain modified organosilicon hydrophilic softener.

[0109] Comparative Example 1 This embodiment provides a fabric post-treatment method, which differs from Embodiment 1 in that the modified chitosan antibacterial agent is replaced with chitosan (Weihai Disha Marine Products Co., Ltd.).

[0110] Comparative Example 2 This embodiment provides a fabric post-treatment method, which differs from Embodiment 1 in that the modified polycarboxylic acid crosslinking agent is replaced by butanetetracarboxylic acid in equal mass.

[0111] Comparative Example 3 This embodiment provides a fabric post-treatment method, which differs from Embodiment 1 in that the modified organosilicon hydrophilic softener is replaced by amino silicone oil (JY-203).

[0112] Test methods The fabrics treated with the post-processing methods provided in the examples and comparative examples were subjected to the following performance tests: (1) Antibacterial rate (%): The antibacterial rate of Staphylococcus aureus on the fabric after 50 washes was tested in accordance with GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Vibration method". (2) Water absorption time (s): The water absorption time of the fabric was tested in accordance with GB / T 21655.1-2023 "Evaluation of the moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method"; (3) Tensile strength retention rate (%): The tensile strength retention rate of the fabric was tested in accordance with GB / T 3923.1-2013 "Textiles - Tensile properties of fabrics - Part 1: Determination of tensile strength and elongation at break (strip method)". The test results are shown in Table 1: Table 1 The test results show that: (1) As can be seen from Examples 1 to 3, the fabric treated by the post-treatment method provided by the present invention still has a strong inhibitory ability against Staphylococcus aureus, reaching 93.5-95.4%, after 50 standard household washes. The fabric has strong wash resistance and durability. The water absorption time is only 1.5-2.1 s, the fabric has good hydrophilicity, the water droplets are absorbed by the fabric quickly, and the moisture absorption and perspiration performance is excellent. The breaking strength retention rate can reach 95-98%, the mechanical properties of the fabric are less damaged, and the durability is high.

[0113] (2) As can be seen from Example 1 and Comparative Example 1, traditional chitosan antibacterial agents rely solely on electrostatic adsorption or hydrogen bonding to bind with fibers, resulting in extremely poor wash resistance. The antibacterial rate drops significantly after 50 washes. Furthermore, its water solubility is poor and it is difficult to synergistically react with crosslinking agents. In this invention, free radical grafting active sites are generated by activation initiated by ammonium persulfate, and then carboxyl groups are introduced by copolymerization with maleic anhydride, transforming chitosan into an amphoteric water-soluble polymer with both amino and carboxyl groups. This not only retains the antibacterial activity of protonated amino groups but also provides covalent reaction anchors for subsequent crosslinking and fixation. At the same time, the composite nano zinc oxide forms an inorganic-organic dual antibacterial mechanism, effectively solving the problems of poor wash resistance, weak binding with fibers, and insufficient broad-spectrum antibacterial properties of traditional chitosan antibacterial agents.

[0114] (3) As can be seen from Example 1 and Comparative Example 2, traditional butanetetracarboxylic acid crosslinking agents require temperatures above 180°C to effectively crosslink. High temperatures can cause irreversible thermal shrinkage and loss of elasticity in the spandex in the fabric, and the hand feel is stiff after strong crosslinking. In this invention, a polycarboxylic acid ester prepolymer is formed by sodium hypophosphite catalysis and partial esterification with citric acid, and then polyethylene glycol is used to further esterify and introduce flexible polyether segments. The modified polycarboxylic acid crosslinking agent can be efficiently crosslinked at 160-170°C, reducing the crosslinking temperature by 15-20°C, thereby significantly reducing the thermal damage to spandex and improving the elasticity retention rate of the fabric. At the same time, the internal plasticizing segments in polyethylene glycol give the crosslinking network flexibility, avoiding the stiff hand feel caused by single butanetetracarboxylic acid crosslinking, and solving the problems of traditional crosslinking agents damaging fibers at high temperatures, not crosslinking at low temperatures, and having a stiff hand feel.

[0115] (4) As can be seen from Example 1 and Comparative Example 3, traditional amino silicone oil softeners are highly hydrophobic and form a continuous hydrophobic film on the surface of fabric fibers, which leads to a sharp decrease in the fabric's moisture absorption and perspiration capacity (the water absorption time is extended from a few seconds to more than 20 seconds). Moreover, covering the surface of the antibacterial agent reduces the antibacterial effect. At the same time, the charge repulsion with chitosan causes uneven deposition. In this invention, hydrophilic polyether segments are introduced into the side chain of amino silicone oil through ring-opening grafting of epoxy polyether, so as to achieve self-emulsification and hydrophilization (contact angle (referring to the contact angle between water (water droplets) and the softened surface). The static contact angle between the fabric fiber surfaces was reduced from 110° to below 40°. Then, a quaternization reaction was carried out using quaternary ammonium salt glycidyl ether to introduce cationic antibacterial groups, which formed a charge complement rather than repulsion with the modified chitosan. Finally, the softener was end-capped with isocyanate propylene trimethoxysilane, which allowed the softener to form a self-crosslinking network through siloxane hydrolysis and condensation during setting and drying. This network interpenetrated and anchored with the modified polycarboxylic acid crosslinking agent, solving the problems of traditional amino silicone oil severely damaging the fabric's hydrophilicity, masking the antibacterial surface, and poor compatibility between auxiliaries.

[0116] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A fabric post-treatment method with long-lasting antibacterial function, characterized in that, The fabric post-processing method includes: (1) Immerse the fabric in a modified chitosan antibacterial agent solution for padding treatment; (2) Immerse the fabric after the padding treatment in step (1) into the modified polycarboxylic acid crosslinking agent solution for padding treatment; (3) Immerse the fabric after the padding treatment in step (2) into the modified organosilicon hydrophilic softener solution for padding treatment to complete the fabric post-treatment.

2. The fabric post-processing method according to claim 1, characterized in that, The modified chitosan antibacterial agent solution includes a modified chitosan antibacterial agent and solvent A; Preferably, the mass fraction of the modified chitosan antibacterial agent in the modified chitosan antibacterial agent solution is 0.5-2%; Preferably, solvent A comprises water; Preferably, the raw materials for preparing the modified chitosan antibacterial agent include chitosan, initiator, modifier, and nano-metal oxide; Preferably, the initiator comprises a free radical initiator; Preferably, the free radical initiator comprises ammonium persulfate; Preferably, the modifier comprises an unsaturated carboxylic acid or a derivative thereof; Preferably, the unsaturated carboxylic acid or its derivatives include maleic anhydride; Preferably, the D50 particle size of the nano-metal oxide is 20-50 nm; Preferably, the D90 particle size of the nano-metal oxide is <80 nm; Preferably, the nano-metal oxide includes nano-zinc oxide; Preferably, the mass ratio of chitosan, initiator, modifier, and nano-metal oxide is 1:(0.005-0.015):(0.25-0.5):(0.04-0.06). Preferably, the modified chitosan antibacterial agent is prepared by the following method: (A1) Chitosan and initiator are mixed for pre-activation; (A2) After the reaction described in step (A1) is completed, add the modifier and continue the reaction; (A3) After the reaction described in step (A2) is completed, nano-metal oxide is added and mixed to obtain the modified chitosan antibacterial agent; Preferably, the chitosan in step (A1) is dissolved in an acidic solvent to prepare a chitosan solution with a mass fraction of 3-5%, which is then mixed with the initiator; Preferably, the acidic solvent comprises an aqueous solution of acetic acid with a mass fraction of 1-3%; Preferably, the pre-activation temperature in step (A1) is 40-60°C, and the pre-activation time is 25-35 min; Preferably, the preactivation in step (A1) is carried out in an inert gas atmosphere, wherein the inert gas includes nitrogen. Preferably, the reaction temperature in step (A2) is 60-80°C, and the reaction time is 2-4 h; Preferably, the nano-metal oxides described in step (A3) are dispersed in solvent B to prepare a nano-metal oxide dispersion with a mass fraction of 1-3%. Preferably, solvent B comprises water; Preferably, the nano-metal oxide is dispersed in solvent B, and the dispersion is carried out by ultrasound for 20-30 min. Preferably, the mixing temperature in step (A3) is 25-35°C, and the mixing time is 1-2 h; Preferably, after the mixing in step (A3) is completed, the steps of filtering, washing and freeze-drying are also included.

3. The fabric post-processing method according to claim 1 or 2, characterized in that, The modified polycarboxylate crosslinking agent solution includes a modified polycarboxylate crosslinking agent and solvent C; Preferably, the mass fraction of the modified polycarboxylate crosslinking agent in the modified polycarboxylate crosslinking agent solution is 1-3%; Preferably, the solvent C comprises water; Preferably, the raw materials for preparing the modified polycarboxylic acid crosslinking agent include acid monomers, alcohol monomers, and internal plasticizers; Preferably, the acid monomer comprises butanetetracarboxylic acid; Preferably, the alcohol monomer includes citric acid; Preferably, the internal plasticizer comprises polyethylene glycol; Preferably, the number-average molecular weight of the polyethylene glycol is 300-500 g / mol; Preferably, the mass ratio of the acid monomer, alcohol monomer, and internal plasticizer is 1:(0.16-0.34):(0.083-0.125). Preferably, the modified polycarboxylate crosslinking agent solution is prepared by the following method: (B1) Mix the acid monomer and alcohol monomer to carry out a partial esterification reaction; (B2) After the reaction described in step (B1) is completed, add the internal plasticizer and carry out the reaction to obtain the modified polycarboxylic acid crosslinking agent solution; Preferably, the acid monomer is dissolved in solvent D to prepare an acid monomer solution with a mass fraction of 10-20%, and then mixed with the crosslinking catalyst to obtain a mixed solution. The pH value of the mixed solution is then adjusted to 4-5 with a pH adjuster before being mixed with the alcohol monomer. Preferably, the mass ratio of the acid monomer to the crosslinking catalyst is 1:(0.1-0.34). Preferably, the crosslinking catalyst comprises sodium hypophosphite; Preferably, the solvent D comprises water; Preferably, the pH adjuster comprises an aqueous solution of sodium hydroxide with a mass fraction of 8-12%; Preferably, the temperature of the partial esterification reaction in step (B1) is 70-90°C, and the time of the partial esterification reaction is 1-2 h; Preferably, the esterification rate of the partial esterification reaction in step (B1) is 20-40%; Preferably, after the partial esterification reaction described in step (B1), the reaction system is cooled to 50-60°C; Preferably, the reaction temperature in step (B2) is 50-60°C, and the reaction time is 30-40 min; Preferably, after the reaction in step (B2) is completed, a cooling and drying step is also included.

4. The fabric post-processing method according to any one of claims 1-3, characterized in that, The modified organosilicon hydrophilic softener solution comprises a modified organosilicon hydrophilic softener and solvent E; Preferably, the modified silicone hydrophilic softener solution contains 1-3% by mass of the modified silicone hydrophilic softener. Preferably, the solvent E comprises water; Preferably, the raw materials for preparing the modified organosilicon hydrophilic softener include an organosilicon matrix, an epoxy hydrophilic modifier, a cationic antibacterial component, and a capping crosslinking agent; Preferably, the organosilicon matrix comprises amino silicone oil; Preferably, the epoxy hydrophilic modifier comprises epoxy polyether; Preferably, the cationic antibacterial component comprises quaternary ammonium salt glycidyl ether; Preferably, the end-capping crosslinking agent comprises isocyanate propylenetrimethoxysilane; Preferably, the mass ratio of the organosilicon matrix, epoxy hydrophilic modifier, cationic antibacterial component and end-capping crosslinking agent is 1:(0.125-0.25):(0.1-0.2):(0.03-0.05).

5. The fabric post-processing method according to claim 4, characterized in that, The modified organosilicon hydrophilic softener was prepared by the following method: (C1) The organosilicon matrix and the epoxy hydrophilic modifier are mixed and reacted; (C2) After the reaction described in step (C1) is completed, add the cationic antibacterial component and continue the reaction; (C3) After the reaction described in step (C2) is completed, add the end-capping crosslinking agent and carry out the reaction to obtain the modified organosilicon hydrophilic softener; Preferably, the organosilicon matrix described in step (C1) is dissolved in solvent F to prepare an organosilicon matrix solution with a mass fraction of 20-30%, and then mixed with an epoxy hydrophilic modifier; Preferably, the solvent F comprises anhydrous isopropanol; Preferably, the reaction temperature in step (C1) is 80-100℃, and the reaction time is 3-5 h; Preferably, after the reaction described in step (C1), the reaction system is cooled to 60-80°C; Preferably, the reaction temperature in step (C2) is 60-80°C, and the reaction time is 2-4 h; Preferably, after the reaction described in step (C2), the reaction system is cooled to 40-50°C; Preferably, the reaction temperature in step (C3) is 40-50°C, and the reaction time is 1-2 h; Preferably, the reactions described in steps (C1), (C2), and (C3) are each carried out independently in an inert gas atmosphere, wherein the inert gas includes nitrogen. Preferably, after the reaction in step (C3) is completed, a step of removing the solvent is also included.

6. The fabric post-processing method according to any one of claims 1-5, characterized in that, The immersion and rolling process in step (1) is one immersion and one rolling; Preferably, the roll residue rate of the impregnation treatment in step (1) is 70-90%; Preferably, the impregnation and rolling process in step (1) further includes a baking step; Preferably, the baking temperature is 80-100℃ and the baking time is 1-2 min.

7. The fabric post-processing method according to any one of claims 1-6, characterized in that, The immersion and rolling process in step (2) is a two-immersion and two-roll process; Preferably, the roll residue of the impregnation treatment in step (2) is 70-85%; Preferably, step (2) further includes a baking step after the impregnation and rolling treatment; Preferably, the baking temperature is 160-180℃ and the baking time is 1-3 min.

8. The fabric post-processing method according to any one of claims 1-7, characterized in that, The immersion and rolling process in step (3) is a two-dip and two-roll process; Preferably, the rolling residue of the impregnation process in step (3) is 60-80%.

9. The fabric post-processing method according to any one of claims 1-8, characterized in that, Step (3) after the padding process also includes a shaping and drying step; Preferably, the temperature for shaping and drying is 120-150℃, and the drying time is 3-5 minutes.

10. An underwear fabric, characterized in that, The underwear fabric is obtained by post-processing the fabric post-processing method according to any one of claims 1-9.

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