Multifunctional fabric and preparation method thereof

Abstract

The application relates to the technical field of textiles, and particularly discloses a multifunctional fabric and a preparation method thereof. The preparation method of the multifunctional fabric comprises the following steps: after impurity removal treatment is performed on a base fabric, the base fabric is immersed into a composite enzyme pre-activation solution to perform a pre-activation enzymatic reaction, then an enzymatic pre-crosslinking functional finishing liquid containing laccase and a functional finishing agent is used to perform a crosslinking enzymatic reaction, the pH of the system is adjusted, and after immersion, pre-drying and heat fixation treatment, the multifunctional fabric is obtained. The functional finishing agent is prepared by first grafting alpha-lipoic acid and natural phenolic acid to the molecular chain of epsilon-polylysine through amidation reaction, and then introducing a s-triazine active structure containing a taurine group. The multifunctional fabric obtained by the application has the properties of antibiosis, washable antibiosis, antioxidation, ultraviolet protection and hydrophilic wetting, and the fixation fastness of the functional components is high, so the multifunctional fabric is suitable for the fields of health protection, sportswear and home textiles.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and more specifically, to a multifunctional fabric and its preparation method. Background Technology

[0002] With the rapid development of medical protective equipment, sports and health products, home wear, and high-value-added textiles, higher demands are being placed on the antibacterial, UV protection, antioxidant, skin-friendly comfort, and washability properties of textile fabrics. Natural fibers and similar fabrics offer advantages such as softness, comfort, moisture absorption, breathability, and good processing adaptability; however, their inherent functionality is limited. During use, they are easily affected by factors such as sweat, sebum, light, and microorganisms, leading to problems such as odor, discoloration, aging, and decreased hygiene and safety, making it difficult to meet the functional and durable application needs in various scenarios.

[0003] Currently, commonly used functional finishing methods include padding, coating, surface modification, grafting modification, and composite finishing. These methods can improve the antibacterial, UV protection, or antioxidant properties of fabrics to some extent. However, existing functional finishing systems usually focus on imparting a single function, making it difficult to simultaneously meet multiple usage requirements such as antibacterial, antioxidant, UV protection, and washability. Furthermore, some functional finishing processes have relatively harsh conditions, which can easily affect the hand feel, breathability, or wearing performance of the finished fabric, making it difficult to meet the comprehensive requirements of fabric functionality and comfort in various application scenarios.

[0004] Therefore, there is an urgent need to develop a multifunctional fabric and its preparation method that can take into account antibacterial, antioxidant, UV protection, washability, durability, and wearing comfort. Summary of the Invention

[0005] To address the problems of limited fabric functionality, insufficient retention of function after washing, and difficulty in balancing functionality and comfort in existing technologies, this invention provides a multifunctional fabric and its preparation method.

[0006] In a first aspect, the present invention provides a method for preparing a multifunctional fabric, employing the following technical solution: A method for preparing a multifunctional fabric includes the following steps: S1. Add the base fabric to the pretreatment solution for impurity removal. After the treatment is completed, take out the base fabric, wash it with water and dry it to obtain the pretreated fabric. S2. Immerse the pretreated fabric in the compound enzyme pre-activation solution to carry out the pre-activation enzymatic reaction. After the reaction is completed, perform enzyme inactivation treatment, and then wash, dehydrate and dry to obtain the pre-activated fabric. S3. Add the functional finishing agent to deionized water, stir evenly, adjust the pH of the system to 5.5-6.3, then add laccase, continue stirring, and obtain the enzymatic pre-crosslinking functional finishing solution; S4. Immerse the pre-activated fabric in the enzymatic pre-crosslinking functional finishing solution to carry out the crosslinking enzymatic reaction. After the reaction is completed, adjust the pH of the system to 8.0-8.8, and then perform padding treatment. After the treatment is completed, the padded fabric is pre-dried, heat-fixed, washed, dehydrated and dried to obtain a multifunctional fabric.

[0007] Preferably, the base fabric in step S1 is a cotton fabric.

[0008] Preferably, the mass ratio of the base fabric to the pretreatment solution in step S1 is 1:20-30.

[0009] Preferably, the pretreatment solution in step S1 comprises the following components by mass percentage: 0.3-0.6% nonionic refining agent, 0.15-0.25% sodium bicarbonate, 0.04-0.08% sodium gluconate, 0.04-0.08% nonionic penetrant, and the balance being deionized water; the pH of the pretreatment solution is 7.5-8.2.

[0010] Preferably, the nonionic refining agent is selected from one or more of fatty alcohol polyoxyethylene ethers, isomeric alcohol polyoxyethylene ethers, and alkyl glycosides.

[0011] Preferably, the nonionic penetrant is selected from one or more of isooctanol polyoxyethylene ether, isotridecyl alcohol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether.

[0012] Preferably, the impurity removal process in step S1 specifically involves stirring for 25-35 minutes at a temperature of 45-55℃ and a rotation speed of 100-160 r / min.

[0013] Preferably, the washing and drying process in step S1 specifically involves washing the base fabric after impurity removal with deionized water 2-3 times, each time for 3-5 minutes, and then drying it at a temperature of 50-60℃ for 20-40 minutes.

[0014] Preferably, the mass ratio of the pretreated fabric to the preactivated enzyme solution in step S2 is 1:20-30.

[0015] Preferably, the pre-activated enzyme solution in step S2 comprises the following components by mass percentage: 0.1-0.2% acidic cellulase, 0.04-0.08% acidic pectinase, 0.2-0.4% acetate-sodium acetate buffer, 0.03-0.06% isooctanol polyoxyethylene ether, and the balance being deionized water; the pH of the pre-activated enzyme solution is 5.6-6.2.

[0016] Preferably, the pre-activation enzymatic reaction in step S2 specifically involves stirring the reaction for 40-50 minutes at a temperature of 45-52℃ and a rotation speed of 100-180 r / min.

[0017] Preferably, the enzyme inactivation treatment in step S2 specifically involves placing the fabric after the enzymatic reaction in deionized water at a temperature of 85-92℃ for 5-10 minutes to inactivate the enzyme.

[0018] Preferably, the washing, dehydration and drying in step S2 specifically involves: washing the enzyme-inactivated fabric with deionized water 2-3 times, each time for 3-5 minutes; then centrifuging at room temperature and a speed of 800-1200 r / min for 3-5 minutes, and then drying at a temperature of 50-60℃ for 20-40 minutes.

[0019] Preferably, in step S3, the mass ratio of the functional finishing agent, laccase, and deionized water is 1:0.03-0.06:50-70.

[0020] Preferably, the preparation method of the functional finishing agent includes the following steps: A1. Add α-lipoic acid and natural phenolic acid to a mixed solvent and stir until completely dissolved. Add EDC and NHS and stir to react to obtain a carboxyl-activated solution. A2. Add ε-polylysine to deionized water, stir until completely dissolved, and adjust the pH of the system to 5.5-6.8 to obtain an ε-polylysine solution; A3. Under stirring, the carboxyl activation solution was added dropwise to the ε-polylysine solution. After the addition was complete, the reaction was continued by stirring. After the reaction was completed, the solution was concentrated by ultrafiltration to obtain the modified ε-polylysine solution. A4. Add taurine to deionized water and stir until completely dissolved. Add sodium carbonate and continue stirring until homogeneous to obtain sodium taurine solution. A5. Add cyanuric chloride to an acetone aqueous solution, stir well, then add sodium taurate solution. After the addition is complete, continue stirring the reaction. Control the pH of the system during the reaction to obtain the dichlorotriazine intermediate reaction solution. A6. Under stirring, the dichlorotriazine intermediate reaction solution was added to the modified ε-polylysine solution. After the addition was completed, the reaction was continued to be stirred. After the reaction was completed, the functional finishing agent was obtained through post-treatment.

[0021] Preferably, in step A1, the mass ratio of α-lipoic acid, natural phenolic acid, EDC, NHS and mixed solvent is 1:0.45-0.65:1.4-1.6:0.6-0.7:60-70.

[0022] Preferably, the mixed solvent in step A1 is composed of deionized water and anhydrous ethanol in a volume ratio of 3-4:6-7.

[0023] Preferably, the natural phenolic acid in step A1 is selected from one or more of caffeic acid and gallic acid.

[0024] Preferably, in step A1, stirring until completely dissolved means stirring for 20-40 minutes under conditions of darkness, room temperature, and a rotation speed of 300-500 r / min until completely dissolved.

[0025] Preferably, the stirring reaction in step A1 refers to stirring the reaction for 1.5-2.5 hours under the conditions of avoiding light, room temperature, and a rotation speed of 400-600 r / min.

[0026] Preferably, in step A2, the mass ratio of ε-polylysine to deionized water is 1:25-35.

[0027] Preferably, in step A2, stirring until completely dissolved means stirring for 20-40 minutes at room temperature and a rotation speed of 300-500 r / min until completely dissolved.

[0028] Preferably, in step A3, the rotation speed of the carboxyl activating solution added dropwise under stirring is 500-700 r / min, and the dropping time is 30-50 min.

[0029] Preferably, the volume ratio of the carboxyl activating solution and the ε-polylysine solution in step A3 is 1:1.5-2.5.

[0030] Preferably, in step A3, the continued stirring reaction means continuing the stirring reaction for 4-6 hours under the conditions of avoiding light, room temperature, and a rotation speed of 500-700 r / min.

[0031] Preferably, the concentration after ultrafiltration in step A3 refers to: ultrafiltration purification of the reaction solution using an ultrafiltration membrane with a molecular weight cutoff of 2000 Da, ultrafiltration temperature of 20-30℃, operating pressure of 0.1-0.2 MPa, washing with deionized water at a washing ratio of 4-6 times the volume (based on the initial volume of the ultrafiltration system); and then concentration under reduced pressure for 1-2 hours at a temperature of 35-40℃ and a vacuum degree of -0.085 MPa to -0.095 MPa.

[0032] Preferably, the mass ratio of taurine, sodium carbonate and deionized water in step A4 is 1:0.4-0.5:8-15.

[0033] Preferably, in step A4, stirring until completely dissolved means stirring for 20-30 minutes at room temperature and a rotation speed of 300-500 r / min until completely dissolved.

[0034] Preferably, in step A4, "continue stirring until homogeneous" means stirring for 20-30 minutes at room temperature and a rotation speed of 300-500 r / min.

[0035] Preferably, the mass ratio of cyanuric chloride, sodium taurate solution, and acetone aqueous solution in step A5 is 1:7-9:18-22.

[0036] Preferably, the acetone content in the acetone aqueous solution in step A5 is 60-80% by mass.

[0037] Preferably, the term "stirring evenly" in step A5 refers to stirring for 10-20 minutes at a temperature of 0-5℃ and a rotation speed of 500-700 r / min.

[0038] Preferably, the addition time of the sodium taurine solution in step A5 is controlled to be 20-40 minutes.

[0039] Preferably, in step A5, the continued stirring reaction means continuing the stirring reaction for 1.5-2.5 hours at a temperature of 0-5℃ and a rotation speed of 500-700 r / min.

[0040] Preferably, in step A6, the stirring speed of the dichlorotriazine intermediate reaction solution is 500-700 r / min, and the addition time is 30-50 min.

[0041] Preferably, in step A6, the volume ratio of the dichlorotriazine intermediate reaction solution to the modified ε-polylysine solution is 1:4-6.

[0042] Preferably, in step A6, continuing the stirring reaction means continuing the stirring reaction for 2-4 hours at a temperature of 5-10℃ and a rotation speed of 500-700 r / min.

[0043] Preferably, the post-treatment in step A6 refers to: first, concentrating under reduced pressure for 0.5-1 h at a temperature of 30-35℃ and a vacuum degree of -0.060MPa to -0.080MPa; then, performing ultrafiltration purification using an ultrafiltration membrane with a molecular weight cutoff of 4000Da at a temperature of 20-30℃ and an operating pressure of 0.1-0.2MPa; washing with deionized water at a washing ratio of 5-8 times the volume (based on the initial volume of the ultrafiltration system); and finally, concentrating under reduced pressure for 1-2 h at a temperature of 35-40℃ and a vacuum degree of -0.085MPa to -0.095MPa.

[0044] Preferably, the term "stirring evenly" in step S3 refers to stirring for 20-30 minutes at room temperature and a rotation speed of 300-500 r / min.

[0045] Preferably, in step S4, the mass ratio of the pre-activated fabric to the enzymatically pre-crosslinked functional finishing solution is 1:20-30.

[0046] Preferably, the cross-linking enzymatic reaction in step S4 specifically involves stirring the reaction for 20-40 minutes at room temperature and a rotation speed of 100-160 r / min.

[0047] Preferably, the padding process in step S4 specifically involves immersing the pre-activated fabric in the enzyme-catalyzed pre-crosslinking functional finishing solution at room temperature for 20-30 minutes, followed by a three-dip, three-padding process; wherein, after each immersion, the fabric is rolled by a padding machine with a roller pressure of 0.25-0.35 MPa, a padding machine speed of 1-2 m / min, and the padding residue is controlled to be 70-85%.

[0048] Preferably, the pre-drying and heat-fixing treatment in step S4 specifically involves pre-drying the impregnated fabric at a temperature of 75-85℃ for 3-5 minutes, followed by heat-fixing treatment at a temperature of 125-135℃ for 2-3 minutes.

[0049] Preferably, the washing, dehydration and drying in step S4 are specifically as follows: the heat-fixed fabric is first washed with deionized water 2-3 times, each time for 3-5 minutes; then washed with a fatty alcohol polyoxyethylene ether aqueous solution at a temperature of 45-55℃ and a mass concentration of 0.5-1.0 g / L for 8-12 minutes, with a bath ratio (mass of the heat-fixed fabric to volume ratio of the fatty alcohol polyoxyethylene ether aqueous solution) of 1:30-50; then washed again with deionized water until the pH of the washing solution is neutral, centrifuged at room temperature and a speed of 800-1200 r / min for 3-5 minutes, and then dried at a temperature of 50-60℃ for 20-40 minutes.

[0050] Secondly, the present invention provides a multifunctional fabric, which adopts the following technical solution: A multifunctional fabric prepared by the above-mentioned method.

[0051] In summary, the present invention has the following beneficial effects: 1. This invention prepares a functional finishing agent by grafting α-lipoic acid and natural phenolic acid onto the ε-polylysine molecular chain. The ε-polylysine molecular chain contains abundant amino groups, which can serve as the basis for antibacterial function; the α-lipoic acid structure contains a disulfide heterocycle, which has free radical scavenging and antioxidant activity; the natural phenolic acid structure contains phenolic hydroxyl groups and aromatic conjugated structures, which can improve the antioxidant capacity and ultraviolet absorption capacity of the functional finishing agent.

[0052] 2. This invention introduces a taurine-containing triazine active structure into the functional finishing agent through the reaction of cyanuric chloride and sodium taurate. On the one hand, the active chlorine groups retained in the triazine structure can undergo a substitution reaction with the hydroxyl groups on the surface of cotton fibers under weakly alkaline and thermosetting conditions, enabling the functional finishing agent to form a more stable chemical bond with the cotton fibers, thereby improving the wash resistance and durability of the finished fabric. On the other hand, the sulfonic acid groups in the taurine group can improve the hydrophilicity and aqueous dispersion stability of the functional finishing agent, which is beneficial for the uniform dispersion of the functional finishing agent in the finishing solution and its action on the fabric surface, thus improving the hydrophilic comfort of the fabric.

[0053] 3. This invention employs a combination of impurity removal treatment and pre-activation enzymatic reaction treatment to pretreat the base fabric. Impurity removal treatment can remove oils, waxes, sizing agents, and other impurities from the fabric surface, improving the fabric surface wettability; pre-activation enzymatic reaction treatment can gently regulate the fiber surface structure, increasing the number of contactable and reactive active sites on the fiber surface, thereby facilitating the penetration, adsorption, and reaction fixation of subsequent functional finishing agents.

[0054] 4. This invention utilizes laccase-catalyzed pre-crosslinking to promote the oxidative coupling reaction of phenolic hydroxyl groups in the natural phenolic acid structure, enabling the functional finishing agent to form a crosslinked network structure on the fabric surface. This crosslinked structure enhances the binding stability of functional components on the fabric surface, reduces the shedding of functional components during washing, and thus improves the wash resistance, antibacterial properties, antioxidant durability, and UV protection durability of multifunctional fabrics.

[0055] 5. This invention employs a finishing process combining padding, pre-drying, and heat setting. The process flow is continuous and suitable for textile finishing. Padding facilitates the full penetration of functional finishing agents into the fabric structure and fiber gaps; pre-drying promotes the uniform distribution of functional finishing agents on the fiber surface; and heat setting promotes the reaction between the triazine active groups and the fiber surface active groups. The resulting multifunctional fabric possesses excellent antibacterial, wash-resistant antibacterial, antioxidant, UV-protective, and hydrophilic properties, while maintaining the original softness and wearing comfort of the fabric. It can be applied in fields such as hygiene protection, sportswear, and home textiles. Detailed Implementation

[0056] The present invention will be further described in detail below with reference to the embodiments.

[0057] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0058] The key raw materials used in the embodiments and comparative examples of this invention are sourced from the following sources: Cyanide trichloroethylene: CAS No.: 108-77-0, purchased from Shandong Xuchen Chemical Technology Co., Ltd.; ε-Polylysine: CAS No.: 25104-18-1, purchased from Taian Heguang Fine Chemical Co., Ltd.; Acidic cellulase: Enzyme activity: 100,000 U / g, purchased from Hefei Shengrun Biological Products Co., Ltd. Acidic pectinase: Enzyme activity: 10000U / g, purchased from Shenzhen Jinfuyuan Biotechnology Co., Ltd. Laccase: Enzyme activity: 10000U / g, purchased from Shandong Pingju Biotechnology Co., Ltd. Isooctanol polyoxyethylene ether: Brand: Yuno, purchased from Jinan Yuno Chemical Co., Ltd.; Fatty alcohol polyoxyethylene ether: Brand: Shengrui, purchased from Shandong Shengrui Chemical Technology Co., Ltd.; Staphylococcus aureus ( Staphylococcus aureus Accession number: CICC 21600, purchased from China Industrial Microbial Culture Collection Center; Escherichia coli ( Escherichia coli Accession number: ATCC 25922, purchased from China Industrial Microbial Culture Collection Center.

[0059] Examples 1-3 provide a multifunctional fabric and its preparation method. Example 1

[0060] The preparation method of the functional finishing agent includes the following steps: A1. Control the mass ratio of α-lipoic acid, caffeic acid, EDC, NHS and mixed solvent to 1:0.45:1.4:0.6:60. Add α-lipoic acid and caffeic acid to the mixed solvent (composed of deionized water and anhydrous ethanol in a volume ratio of 3:7). Stir for 40 min until completely dissolved under the conditions of avoiding light, room temperature and a speed of 300 r / min. Add EDC and NHS and stir for 2.5 h under the conditions of avoiding light, room temperature and a speed of 400 r / min to obtain a carboxyl-activated solution. A2. Control the mass ratio of ε-polylysine to deionized water to 1:25. Add ε-polylysine to deionized water and stir for 40 minutes at room temperature and 300 r / min until completely dissolved. Adjust the pH of the system to 5.5 using a 5% sodium hydroxide aqueous solution to obtain an ε-polylysine solution. A3. The volume ratio of carboxyl activation solution to ε-polylysine solution was controlled at 1:1.5. The carboxyl activation solution was added dropwise to the ε-polylysine solution at a speed of 500 r / min for 30 min. After the addition was complete, the reaction was continued for 6 h under conditions of darkness, room temperature, and a speed of 500 r / min. After the reaction, the reaction solution was purified by ultrafiltration using an ultrafiltration membrane with a molecular weight cutoff of 2000 Da at a temperature of 20℃ and an operating pressure of 0.1 MPa. The solution was washed with deionized water at a filtration ratio of 4 times the initial volume of the ultrafiltration system. Subsequently, the solution was concentrated under reduced pressure for 2 h at a temperature of 35℃ and a vacuum degree of -0.085 MPa to obtain the modified ε-polylysine solution. A4. Control the mass ratio of taurine, sodium carbonate and deionized water to 1:0.4:8. Add taurine to deionized water and stir for 30 minutes at room temperature and 300 r / min until completely dissolved. Add sodium carbonate and continue stirring for 30 minutes at room temperature and 300 r / min to obtain sodium taurine solution. A5. Control the mass ratio of cyanuric chloride, sodium taurate solution, and acetone aqueous solution to 1:7:18. Add cyanuric chloride to acetone aqueous solution (acetone mass percentage is 60%) and stir for 20 min at 0℃ and 500 r / min. Then add sodium taurate solution, controlling the addition time to 20 min. After the addition is complete, continue stirring and reacting for 2.5 h at 0℃ and 500 r / min. During the reaction, use 5% sodium carbonate aqueous solution to control the pH of the system to 5.5 to obtain dichlorotriazine intermediate reaction solution. A6. The volume ratio of the dichlorotriazine intermediate reaction solution to the modified ε-polylysine solution was controlled at 1:4. The dichlorotriazine intermediate reaction solution was added to the modified ε-polylysine solution at a speed of 500 r / min, and the addition time of the dichlorotriazine intermediate reaction solution was controlled at 30 min. After the addition was completed, the reaction was stirred for 4 h at a temperature of 5℃ and a speed of 500 r / min. After the reaction was completed, the reaction solution was concentrated under reduced pressure for 1 h at a temperature of 30℃ and a vacuum degree of -0.060 MPa. Then, it was purified by ultrafiltration using an ultrafiltration membrane with a molecular weight cutoff of 4000 Da at a temperature of 20℃ and an operating pressure of 0.1 MPa. Deionized water was used for washing and filtration at a washing ratio of 5 times the volume (based on the initial volume of the ultrafiltration system). Finally, it was concentrated under reduced pressure for 2 h at a temperature of 35℃ and a vacuum degree of -0.085 MPa to obtain the functional finishing agent. A method for preparing a multifunctional fabric includes the following steps: S1. Control the mass ratio of cotton fabric to pretreatment solution to 1:20. Add the cotton fabric to the pretreatment solution (the pretreatment solution includes the following components by mass percentage: 0.3% fatty alcohol polyoxyethylene ether, 0.15% sodium bicarbonate, 0.04% sodium gluconate, 0.04% isooctanol polyoxyethylene ether, and the balance is deionized water; the pH of the pretreatment solution is 7.5). Stir the solution at 45°C and 100 r / min for 35 min. After the treatment, take out the cotton fabric after the impurity removal treatment, wash it twice with deionized water for 3 min each time, and then dry it at 50°C for 40 min to obtain the pretreated fabric. S2. Control the mass ratio of pretreated fabric and compound enzyme pre-activation solution to 1:20. Immerse the pretreated fabric in the compound enzyme pre-activation solution (the compound enzyme pre-activation solution includes the following components by mass percentage: acidic cellulase 0.1%, acidic pectinase 0.04%, acetate-sodium acetate buffer 0.2%, isooctanol polyoxyethylene ether 0.03%, and the balance is deionized water; the pH of the compound enzyme pre-activation solution is 5.6). Stir and react for 50 min at 45℃ and 100 r / min. After the reaction, place the pre-activated enzyme-catalyzed fabric in deionized water at 85℃ for 10 min to inactivate the enzyme. Wash the enzyme-inactivated fabric twice with deionized water, 5 min each time. Then centrifuge and dehydrate at room temperature and 800 r / min for 5 min, and then dry at 50℃ for 40 min to obtain the pre-activated fabric. S3, the mass ratio of the functional finishing agent, laccase and deionized water is 1:0.03:50. Add the functional finishing agent to the deionized water and stir for 30 min at room temperature and 300 r / min. Adjust the pH of the system to 5.5 with 1% acetic acid aqueous solution, then add laccase and continue stirring for 20 min to obtain the enzymatic pre-crosslinked functional finishing solution. S4. Control the mass ratio of pre-activated fabric to enzyme-catalyzed pre-crosslinking functional finishing solution to 1:20. Immerse the pre-activated fabric in the enzyme-catalyzed pre-crosslinking functional finishing solution and stir for 40 minutes at room temperature and a rotation speed of 100 r / min. After the reaction, adjust the pH of the system to 8 using a 5% sodium carbonate aqueous solution. Immerse the pre-activated fabric in the enzyme-catalyzed pre-crosslinking functional finishing solution at room temperature for 20 minutes, and then perform a three-dip, three-paste treatment. After each dip, the fabric is rolled with a roller pressure of 0.25 MPa and a roller speed of 1 m / min, and the roll residue is controlled at 70%. After the treatment, the rolled fabric... The fabric was pre-dried at 75℃ for 5 minutes, followed by heat-setting at 125℃ for 3 minutes. The heat-set fabric was then washed twice with deionized water for 5 minutes each time. Next, it was washed for 12 minutes with a fatty alcohol polyoxyethylene ether aqueous solution at 45℃ and a mass concentration of 0.5 g / L, with a liquor ratio (mass of the heat-set fabric to volume of the fatty alcohol polyoxyethylene ether aqueous solution) of 1:30. It was then washed again with deionized water until the pH of the washing solution was neutral. After centrifugation at 800 r / min for 5 minutes at room temperature, it was dried at 50℃ for 40 minutes to obtain the multifunctional fabric. Example 2

[0061] The preparation method of the functional finishing agent includes the following steps: A1. Control the mass ratio of α-lipoic acid, caffeic acid, EDC, NHS and mixed solvent to 1:0.55:1.5:0.65:65. Add α-lipoic acid and caffeic acid to the mixed solvent (composed of deionized water and anhydrous ethanol in a volume ratio of 3.5:6.5). Stir for 30 min until completely dissolved under the conditions of avoiding light, room temperature and a speed of 400 r / min. Add EDC and NHS. Stir for 2 h under the conditions of avoiding light, room temperature and a speed of 500 r / min to obtain a carboxyl-activated solution. A2. Control the mass ratio of ε-polylysine to deionized water to 1:30. Add ε-polylysine to deionized water and stir for 30 minutes at room temperature and 400 r / min until completely dissolved. Adjust the pH of the system to 6.2 using a 5% sodium hydroxide aqueous solution to obtain an ε-polylysine solution. A3. The volume ratio of carboxyl activation solution to ε-polylysine solution was controlled at 1:2. The carboxyl activation solution was added dropwise to the ε-polylysine solution at a speed of 600 r / min for 40 min. After addition, the reaction was continued for 5 h under conditions of darkness, room temperature, and a speed of 600 r / min. After the reaction, the reaction solution was purified by ultrafiltration using an ultrafiltration membrane with a molecular weight cutoff of 2000 Da at a temperature of 25℃ and an operating pressure of 0.15 MPa. The solution was washed with deionized water at a filtration ratio of 5 times the initial volume of the ultrafiltration system. Subsequently, the solution was concentrated under reduced pressure for 1.5 h at a temperature of 38℃ and a vacuum of -0.09 MPa to obtain the modified ε-polylysine solution. A4. Control the mass ratio of taurine, sodium carbonate and deionized water to 1:0.45:12. Add taurine to deionized water and stir for 25 minutes at room temperature and 400 r / min until completely dissolved. Add sodium carbonate and continue stirring for 25 minutes at room temperature and 400 r / min to obtain sodium taurine solution. A5. Control the mass ratio of cyanuric chloride, sodium taurate solution, and acetone aqueous solution to 1:8:20. Add cyanuric chloride to acetone aqueous solution (acetone mass percentage is 70%). Stir for 15 min at 2℃ and 600 r / min. Then add sodium taurate solution, controlling the addition time to 30 min. After the addition is complete, continue stirring and reacting for 2 h at 2℃ and 600 r / min. During the reaction, use 5% sodium carbonate aqueous solution to control the pH of the system to 6 to obtain dichlorotriazine intermediate reaction solution. A6. The volume ratio of the dichlorotriazine intermediate reaction solution to the modified ε-polylysine solution was controlled at 1:5. The dichlorotriazine intermediate reaction solution was added to the modified ε-polylysine solution at a speed of 600 r / min, and the addition time of the dichlorotriazine intermediate reaction solution was controlled at 40 min. After the addition was completed, the reaction was stirred for 3 h at a temperature of 8℃ and a speed of 600 r / min. After the reaction was completed, the reaction solution was concentrated under reduced pressure for 0.75 h at a temperature of 32℃ and a vacuum degree of -0.07 MPa. Then, it was purified by ultrafiltration using an ultrafiltration membrane with a molecular weight cutoff of 4000 Da at a temperature of 25℃ and an operating pressure of 0.15 MPa. Deionized water was used for washing and filtration at a washing ratio of 7 times the volume (based on the initial volume of the ultrafiltration system). Finally, it was concentrated under reduced pressure for 1.5 h at a temperature of 38℃ and a vacuum degree of -0.09 MPa to obtain the functional finishing agent. A method for preparing a multifunctional fabric includes the following steps: S1. Control the mass ratio of cotton fabric to pretreatment solution to 1:25. Add the cotton fabric to the pretreatment solution (the pretreatment solution includes the following components by mass percentage: fatty alcohol polyoxyethylene ether 0.45%, sodium bicarbonate 0.2%, sodium gluconate 0.06%, isooctanol polyoxyethylene ether 0.06%, and the balance is deionized water; the pH of the pretreatment solution is 7.8). Stir the solution at 50°C and 130 r / min for 30 min. After the treatment, take out the cotton fabric after the impurity removal treatment, wash it with deionized water 3 times for 4 min each time, and then dry it at 55°C for 30 min to obtain the pretreated fabric. S2. Control the mass ratio of pretreated fabric and compound enzyme pre-activation solution to 1:25. Immerse the pretreated fabric in the compound enzyme pre-activation solution (the compound enzyme pre-activation solution includes the following components by mass percentage: 0.15% acidic cellulase, 0.06% acidic pectinase, 0.3% acetate-sodium acetate buffer, 0.045% isooctanol polyoxyethylene ether, and the balance is deionized water; the pH of the compound enzyme pre-activation solution is 6). Stir and react for 45 min at 49℃ and 140 r / min. After the reaction, place the pre-activated fabric in deionized water at 88℃ for 7.5 min to inactivate the enzyme. Wash the inactivated fabric three times with deionized water for 4 min each time. Then centrifuge and dehydrate at room temperature and 1000 r / min for 4 min, and then dry at 55℃ for 30 min to obtain the pre-activated fabric. S3, the mass ratio of the functional finishing agent, laccase and deionized water is 1:0.05:60. Add the functional finishing agent to the deionized water and stir for 25 min at room temperature and 400 r / min. Adjust the pH of the system to 6 with a 1% acetic acid aqueous solution, then add laccase and continue stirring for 15 min to obtain the enzymatic pre-crosslinked functional finishing solution. S4. Control the mass ratio of pre-activated fabric to enzyme-catalyzed pre-crosslinking functional finishing solution to 1:25. Immerse the pre-activated fabric in the enzyme-catalyzed pre-crosslinking functional finishing solution and stir for 30 minutes at room temperature and a rotation speed of 130 r / min. After the reaction, adjust the pH of the system to 8.4 using a 5% sodium carbonate aqueous solution. Immerse the pre-activated fabric in the enzyme-catalyzed pre-crosslinking functional finishing solution at room temperature for 25 minutes, and then perform a three-dip, three-paste treatment. After each dip, the fabric is rolled with a roller pressure of 0.3 MPa and a roller speed of 1.5 m / min, and the roll residue is controlled at 78%. After the treatment, the rolled fabric is... The fabric was pre-dried at 80℃ for 4 minutes, followed by heat-setting at 130℃ for 2.5 minutes. The heat-set fabric was then washed three times with deionized water for 4 minutes each time. Next, it was washed for 10 minutes with a fatty alcohol polyoxyethylene ether aqueous solution at 50℃ and a mass concentration of 0.8 g / L, with a liquor ratio (mass of the heat-set fabric to volume of the fatty alcohol polyoxyethylene ether aqueous solution) of 1:40. It was then washed again with deionized water until the pH of the washing solution was neutral. After centrifugation at 1000 r / min for 4 minutes at room temperature, it was dried at 55℃ for 30 minutes to obtain a multifunctional fabric. Example 3

[0062] The preparation method of the functional finishing agent includes the following steps: A1. Control the mass ratio of α-lipoic acid, caffeic acid, EDC, NHS and mixed solvent to 1:0.65:1.6:0.7:70. Add α-lipoic acid and caffeic acid to the mixed solvent (composed of deionized water and anhydrous ethanol in a volume ratio of 4:6). Stir for 20 min until completely dissolved under the conditions of avoiding light, room temperature and a speed of 500 r / min. Add EDC and NHS and stir for 1.5 h under the conditions of avoiding light, room temperature and a speed of 600 r / min to obtain a carboxyl-activated solution. A2. Control the mass ratio of ε-polylysine to deionized water to 1:35. Add ε-polylysine to deionized water and stir for 20 minutes at room temperature and 500 r / min until completely dissolved. Adjust the pH of the system to 6.8 using a 5% sodium hydroxide aqueous solution to obtain an ε-polylysine solution. A3. The volume ratio of carboxyl activation solution to ε-polylysine solution was controlled at 1:2.5. The carboxyl activation solution was added dropwise to the ε-polylysine solution at a speed of 700 r / min for 50 min. After the addition was complete, the reaction was continued for 4 h under conditions of darkness, room temperature, and a speed of 700 r / min. After the reaction, the reaction solution was purified by ultrafiltration using an ultrafiltration membrane with a molecular weight cutoff of 2000 Da at a temperature of 30℃ and an operating pressure of 0.2 MPa. The solution was washed with deionized water at a filtration ratio of 6 times the initial volume of the ultrafiltration system. Subsequently, the solution was concentrated under reduced pressure for 1 h at a temperature of 40℃ and a vacuum degree of -0.095 MPa to obtain the modified ε-polylysine solution. A4. Control the mass ratio of taurine, sodium carbonate and deionized water to 1:0.5:15. Add taurine to deionized water and stir for 20 minutes at room temperature and 500 r / min until completely dissolved. Add sodium carbonate and continue stirring for 20 minutes at room temperature and 500 r / min to obtain sodium taurine solution. A5. Controlling the mass ratio of cyanuric chloride, sodium taurate solution, and acetone aqueous solution to 1:9:22, cyanuric chloride was added to the acetone aqueous solution (acetone mass percentage of 80%). After stirring for 10 min at 5℃ and 700 r / min, sodium taurate solution was added, controlling the addition time of sodium taurate solution to 40 min. After the addition was completed, the reaction was continued to be stirred for 1.5 h at 5℃ and 700 r / min. During the reaction, the pH of the system was controlled to be 6.5 using a 5% sodium carbonate aqueous solution. The dichlorotriazine intermediate reaction solution was obtained. A6. The volume ratio of the dichlorotriazine intermediate reaction solution to the modified ε-polylysine solution was controlled at 1:6. The dichlorotriazine intermediate reaction solution was added to the modified ε-polylysine solution at a speed of 700 r / min, and the addition time of the dichlorotriazine intermediate reaction solution was controlled at 50 min. After the addition was completed, the reaction was stirred for 2 h at a temperature of 10℃ and a speed of 700 r / min. After the reaction was completed, the reaction solution was concentrated under reduced pressure for 0.5 h at a temperature of 35℃ and a vacuum degree of -0.080 MPa. Then, it was purified by ultrafiltration using an ultrafiltration membrane with a molecular weight cutoff of 4000 Da at a temperature of 30℃ and an operating pressure of 0.2 MPa. Deionized water was used for washing and filtration at a washing ratio of 8 times the volume (based on the initial volume of the ultrafiltration system). Finally, it was concentrated under reduced pressure for 1 h at a temperature of 40℃ and a vacuum degree of -0.095 MPa to obtain the functional finishing agent. A method for preparing a multifunctional fabric includes the following steps: S1. Control the mass ratio of cotton fabric to pretreatment solution to 1:30. Add the cotton fabric to the pretreatment solution (the pretreatment solution includes the following components by mass percentage: 0.6% fatty alcohol polyoxyethylene ether, 0.25% sodium bicarbonate, 0.08% sodium gluconate, 0.08% isooctanol polyoxyethylene ether, and the balance is deionized water; the pH of the pretreatment solution is 8.2). Stir the solution at 55°C and 160 r / min for 25 min. After the treatment, take out the cotton fabric after the impurity removal treatment, wash it with deionized water 3 times for 3 min each time, and then dry it at 60°C for 20 min to obtain the pretreated fabric. S2. Control the mass ratio of pretreated fabric and compound enzyme pre-activation solution to 1:30. Immerse the pretreated fabric in the compound enzyme pre-activation solution (the compound enzyme pre-activation solution includes the following components by mass percentage: acidic cellulase 0.2%, acidic pectinase 0.08%, acetate-sodium acetate buffer 0.4%, isooctanol polyoxyethylene ether 0.06%, and the balance is deionized water; the pH of the compound enzyme pre-activation solution is 6.2). Stir the reaction at 52℃ and 180 r / min for 40 min. After the reaction, place the pre-activated fabric in deionized water at 92℃ for 5 min to inactivate the enzyme. Wash the inactivated fabric three times with deionized water for 3 min each time. Then centrifuge at 1200 r / min at room temperature for 3 min and dry at 60℃ for 20 min to obtain the pre-activated fabric. S3, the mass ratio of the functional finishing agent, laccase and deionized water is 1:0.06:70. Add the functional finishing agent to the deionized water and stir for 20 min at room temperature and 500 r / min. Adjust the pH of the system to 6.3 with 1% acetic acid aqueous solution, then add laccase and continue stirring for 10 min to obtain the enzymatic pre-crosslinked functional finishing solution. S4. Control the mass ratio of pre-activated fabric to enzyme-catalyzed pre-crosslinking functional finishing solution to 1:30. Immerse the pre-activated fabric in the enzyme-catalyzed pre-crosslinking functional finishing solution and stir for 20 minutes at room temperature and a rotation speed of 160 r / min. After the reaction, adjust the pH of the system to 8.8 using a 5% sodium carbonate aqueous solution. Immerse the pre-activated fabric in the enzyme-catalyzed pre-crosslinking functional finishing solution at room temperature for 30 minutes, and then perform a three-dip, three-paste treatment. After each dip, the fabric is rolled with a roller pressure of 0.35 MPa and a roller speed of 2 m / min, and the roll residue is controlled at 85%. After the treatment, the rolled fabric... The fabric was pre-dried at 85℃ for 3 minutes, then heat-fixed at 135℃ for 2 minutes. After heat-fixing, the fabric was washed three times with deionized water for 3 minutes each time. Then it was washed with a fatty alcohol polyoxyethylene ether aqueous solution at 55℃ and a mass concentration of 1.0 g / L for 8 minutes, with a liquor ratio (mass of the heat-fixed fabric to volume ratio of the fatty alcohol polyoxyethylene ether aqueous solution) of 1:50. After washing again with deionized water until the pH of the washing solution was neutral, it was centrifuged at 1200 r / min at room temperature for 3 minutes and then dried at 60℃ for 20 minutes to obtain a multifunctional fabric.

[0063] To verify the comprehensive performance of the multifunctional fabrics prepared in Examples 1-3 of this invention, the inventors set up Comparative Examples 1-8, as follows: Comparative Example 1

[0064] The difference between this comparative example and Example 1 is that in the original step A1, α-lipoic acid was replaced by caffeic acid in equal mass, while the remaining steps and raw materials were the same as in Example 1. Comparative Example 2

[0065] The difference between this comparative example and Example 1 is that in the original step A1, caffeic acid was replaced by α-lipoic acid by mass, while the remaining steps and raw materials were the same as in Example 1. Comparative Example 3

[0066] The difference between this comparative example and Example 1 is that in the original step A6, the modified ε-polylysine solution is replaced by an equal mass of the ε-polylysine aqueous solution in the original step A2, while the remaining steps and raw materials are the same as in Example 1. Comparative Example 4

[0067] The difference between this comparative example and Example 1 is that in the original step S3, the functional finishing agent is replaced by a modified ε-polylysine solution, while the remaining steps and raw materials are the same as in Example 1. Comparative Example 5

[0068] The difference between this comparative example and Example 1 is that sodium taurine solution is not added in the original step A5, while the remaining steps and raw materials are the same as in Example 1. Specifically: A5. Control the mass ratio of cyanuric chloride and acetone aqueous solution to 1:18. Add cyanuric chloride to acetone aqueous solution (acetone mass percentage is 60%) and stir for 20 min at 0℃ and 500 r / min to obtain cyanuric chloride solution. A6. Controlling the volume ratio of cyanuric chloride solution to modified ε-polylysine solution to 1:4, the cyanuric chloride solution was added to the modified ε-polylysine solution at a speed of 500 r / min, with the addition time controlled at 30 min. After the addition was completed, the reaction was continued to be stirred for 4 h at a temperature of 5℃ and a speed of 500 r / min. After the reaction was completed, the reaction solution was concentrated under reduced pressure for 1 h at a temperature of 30℃ and a vacuum degree of -0.060 MPa. Then, ultrafiltration purification was performed using an ultrafiltration membrane with a molecular weight cutoff of 4000 Da at a temperature of 20℃ and an operating pressure of 0.1 MPa. Deionized water was used for washing, with a washing ratio of 5 times the volume (based on the initial volume of the ultrafiltration system). Finally, the solution was concentrated under reduced pressure for 2 h at a temperature of 35℃ and a vacuum degree of -0.085 MPa to obtain the functional finishing agent. Comparative Example 6

[0069] The difference between this comparative example and Example 1 is that in the original step A5, the sodium taurine solution is replaced by an equal mass of sodium β-alanine solution, while the remaining steps and raw materials are the same as in Example 1. Comparative Example 7

[0070] The difference between this comparative example and Example 1 is that the pre-activated fabric in step S4 is replaced with the pre-treated fabric in step S1, while the remaining steps and raw materials are the same as in Example 1. Comparative Example 8

[0071] The difference between this comparative example and Example 1 is that laccase is not added in the original step S3, while the remaining steps and raw materials are the same as in Example 1. Performance testing

[0072] The comprehensive performance of the multifunctional fabrics prepared in Examples 1-3 and Comparative Examples 1-8 of this invention was tested respectively.

[0073] ① Antibacterial properties The antimicrobial properties were tested according to the standard GB / T 20944.3-2008 "Evaluation of antimicrobial properties of textiles - Part 3: Shaking method". The test bacteria were Staphylococcus aureus and Escherichia coli.

[0074] The multifunctional fabric samples prepared in Examples 1-3 and Comparative Examples 1-8 were cut into 5mm × 5mm pieces, and 0.75g of each sample was placed in a sterile Erlenmeyer flask. 63.0mL of sterile phosphate buffer was added to each flask, followed by 7.0mL of a 5×10⁻⁶ solution. 6 A bacterial suspension of CFU / mL was prepared to bring the initial total volume of the bacterial culture in the Erlenmeyer flask to 70.0 mL, with an initial bacterial concentration of 5 × 10⁻⁶. 5 CFU / mL. Tests were performed using Staphylococcus aureus and Escherichia coli, respectively.

[0075] The Erlenmeyer flask was placed in a constant temperature shaking incubator and cultured at 37℃ and 150 r / min for 24 h. After the culture was completed, 1.0 mL of the culture solution was added to 9.0 mL of sterile phosphate buffer and mixed thoroughly to obtain 10 -1 Diluent; then from 10 -1 Take 1.0 mL of the diluent and add it to a fresh 9.0 mL sterile phosphate buffer solution. Mix thoroughly to obtain 10 mL of the solution. -2 Diluent; prepare 10 by the same method sequentially. -3 10 -4 10 -5 and 10 -6 Diluents: Take 0.1 mL of each appropriate dilution and spread it on the surface of nutrient agar medium. Incubate at 37°C for 24 h and count the colonies. Select plates with colony counts of 30-300 CFU for statistical analysis.

[0076] The antibacterial rate was calculated using the formula: Antibacterial rate = (BA) / B × 100%; where A is the number of viable bacteria after shaking culture of the test sample, and B is the number of viable bacteria after shaking culture of the blank control sample; the test results are shown in Table 1.

[0077] ② Antibacterial performance test after washing The samples were washed according to the standard GB / T 8629-2017 "Home Washing and Drying Procedures for Textile Testing". A standard Type A washing machine was used with the 4N washing program at a temperature of 40℃. The detergent used was standard detergent 3 as specified in GB / T 8629-2017, with a dosage of 20±1g. Standard wash stock as specified in GB / T 8629-2017 was also added, bringing the total dry wash load of the sample and standard wash stock to 2.0±0.1kg. The sample and standard wash stock were thoroughly mixed before being placed in the washing machine. Each complete wash and dry cycle was counted as one home washing cycle. The sample was hung to dry. After 30 washes and drying, the antibacterial rate against Staphylococcus aureus and Escherichia coli was determined according to the above-mentioned antibacterial performance test method.

[0078] The wash resistance and antibacterial retention rate is calculated using the formula: Wash resistance and antibacterial retention rate = R30 / R0×100%; where R0 is the antibacterial rate of the sample before washing, R 30 The antibacterial rate of the sample after 30 washes is shown in Table 1.

[0079] ③ Antioxidant properties The antioxidant properties of the samples were tested using the DPPH free radical scavenging method. DPPH was dissolved in anhydrous ethanol to prepare a 0.10 mmol / L DPPH ethanol solution, which was then stored in the dark for later use.

[0080] Weigh 0.10g of sample, cut it into 5mm×5mm pieces, place them in a stoppered test tube, add 10mL of DPPH ethanol solution, and shake and react for 30min at 25℃ in the dark. After the reaction, take the supernatant and measure its absorbance at a wavelength of 517nm.

[0081] The DPPH free radical scavenging rate was calculated using the formula: DPPH free radical scavenging rate = [1 - (A1 - A2) / A0] × 100%; where A0 is the absorbance of the DPPH ethanol solution without the sample, A1 is the absorbance of the DPPH ethanol solution after the sample has been added and reacted, and A2 is the background absorbance of the sample after extraction in anhydrous ethanol; the test results are shown in Table 2.

[0082] ④ UV protection performance The UV protection performance of the samples was tested according to the standard GB / T 18830-2009 "Evaluation of UV Protection Performance of Textiles". Before testing, the samples were placed in a standard environment with a temperature of 20±2℃ and a relative humidity of 65±5% for 24 hours to equilibrate. During testing, the samples were placed flat on a UV transmittance meter, and the UV transmittance performance at different locations was measured. The UPF value of the samples was recorded. Five different locations were tested for each group of samples, and the lowest UPF value was recorded. The test results are shown in Table 2.

[0083] ⑤ Static water contact angle test The static water contact angles of the multifunctional fabrics obtained in Examples 1-3 and Comparative Examples 1-8 were tested using the static drop method to evaluate the hydrophilic wetting properties of the fabric surface. Before testing, the fabric samples were placed in a standard environment with a temperature of 20±2℃ and a relative humidity of 65±5% for 24 hours to equilibrate. Then, the samples were cut into 50mm×50mm specimens and fixed flat on the sample stage of the contact angle measuring instrument, avoiding wrinkles or uneven tension on the sample surface.

[0084] During the test, a micro-syringe was used to add deionized water droplets to the sample surface, with a single droplet volume of 5 μL. Immediately after the droplet contacted the fabric surface, an image of the droplet was acquired, and the static water contact angle was read within 5 seconds of the droplet stabilizing. Each sample was tested five times at randomly selected locations, and the average value was taken as the static water contact angle for that sample. The test results are shown in Table 2.

[0085] ⑥ Breathability test The air permeability of fabrics was tested according to the standard GB / T 5453-2025 "Textiles - Determination of Air Permeability". Before testing, the multifunctional fabrics obtained in Examples 1-3 and Comparative Examples 1-8 were equilibrated for 24 hours in a standard environment with a temperature of 20±2℃ and a relative humidity of 65±5%. Then, samples were cut, flattened, and clamped in the fabric air permeability meter fixture. The test pressure difference was 100 Pa, and the test area was 20 cm². 2 The gas flow rate through the sample was measured under the specified conditions. Five different locations were randomly selected for testing each sample, and the average value was taken.

[0086] Air permeability is calculated using the formula: Air permeability = q / A × 167; where q is the average airflow rate in L / min; and A is the test area in cm². 2 167 is the conversion factor; the test results are shown in Table 2.

[0087] Table 1: Test results of antibacterial and wash-resistant properties of multifunctional fabrics

[0088] Table 2: Test results of antioxidant, UV protection, hydrophilicity and breathability properties of multifunctional fabrics

[0089] As shown in Tables 1 and 2, the multifunctional fabrics prepared in Examples 1-3 of this invention all exhibit excellent antibacterial, antioxidant, UV protection, hydrophilic, and breathable properties, and maintain a high antibacterial rate even after 30 washes.

[0090] As can be seen from the data shown in Example 1 and Comparative Example 1, since the α-lipoic acid structure was not introduced in Comparative Example 1, the sulfur-containing redox active structure in the functional finishing agent was reduced, and the synergistic antibacterial and antioxidant effects between α-lipoic acid, caffeic acid, and ε-polylysine were weakened, resulting in the initial antibacterial rate, DPPH free radical scavenging rate, and antibacterial rate after 30 washes of the multifunctional fabric being lower than those in Example 1.

[0091] Data from Example 1 and Comparative Example 2 show that: Comparative Example 2 did not introduce a caffeic acid structure, and the phenolic hydroxyl groups and aromatic conjugated structures in the functional finishing agent were reduced, resulting in a decrease in its free radical scavenging ability and ultraviolet absorption ability; at the same time, the absence of the caffeic acid structure weakened the laccase-catalyzed oxidative coupling and pre-crosslinking effects, and reduced the fixation stability of the functional finishing agent on the fabric surface. Therefore, the DPPH free radical scavenging rate, UPF value, and antibacterial rate after 30 washes of the multifunctional fabric were all lower than those of Example 1.

[0092] As can be seen from the data shown in Example 1 and Comparative Example 3, Comparative Example 3 directly used ε-polylysine solution without double grafting modification with α-lipoic acid and caffeic acid, resulting in a single functional group in the functional finishing agent, lacking antioxidant groups, ultraviolet absorption structures and cross-linking reaction sites. Therefore, the antioxidant properties, UV protection properties and wash-resistant antibacterial properties of the multifunctional fabric were significantly reduced.

[0093] Data from Example 1 and Comparative Example 4 show that Comparative Example 4 uses a modified ε-polylysine solution to replace the functional finishing agent. The functional finishing agent mainly relies on physical adsorption to bind with the fabric, lacking a stable covalent fixation effect. Therefore, the antibacterial rate of the multifunctional fabric decreases after 30 washes.

[0094] As can be seen from the data shown in Example 1 and Comparative Example 5, Comparative Example 5 did not add sodium taurate solution, resulting in a lack of sulfonic acid groups in the functional finishing agent, which reduced the water dispersibility of the finishing agent and the wettability of the fabric surface. Therefore, the static water contact angle of the multifunctional fabric increased and the wash resistance and antibacterial properties decreased.

[0095] As shown by the data from Example 1 and Comparative Example 6, in Comparative Example 6, sodium β-alanine solution was used instead of sodium taurate solution, which weakened the hydrophilic ionization and hydration capabilities. The static water contact angle of the resulting multifunctional fabric increased significantly, the hydrophilicity decreased, and the uniformity of the distribution of the functional finishing agent on the fabric surface and the stability of wash fastening were insufficient, resulting in a lower antibacterial rate after 30 washes than in Example 1.

[0096] As can be seen from the data shown in Example 1 and Comparative Example 7, when the pre-activated fabric in step S4 was replaced with the pre-treated fabric in step S1, the removal of impurities on the fabric surface and the exposure of active sites on the fiber surface were insufficient, making it difficult for the functional finishing agent to fully penetrate and bind. As a result, the initial antibacterial rate, post-wash antibacterial rate, DPPH free radical scavenging rate and UPF value of the multifunctional fabric were all lower than those in Example 1.

[0097] As can be seen from the data shown in Example 1 and Comparative Example 8, Comparative Example 8 did not add laccase, which resulted in the caffeic acid structure not being able to undergo sufficient enzymatic oxidative coupling. The pre-crosslinking film-forming effect of the functional finishing agent on the fabric surface was weakened, so the functional components were more likely to fall off during washing, resulting in a significant decrease in the wash resistance and antibacterial properties of the multifunctional fabric.

[0098] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for preparing a multifunctional fabric, characterized in that, The preparation steps include the following: S1. Add the base fabric to the pretreatment solution for impurity removal. After the treatment is completed, take out the base fabric, wash it with water and dry it to obtain the pretreated fabric. S2. Immerse the pretreated fabric in the compound enzyme pre-activation solution to carry out the pre-activation enzymatic reaction. After the reaction is completed, perform enzyme inactivation treatment, and then wash, dehydrate and dry to obtain the pre-activated fabric. S3. Add the functional finishing agent to deionized water, stir evenly, adjust the pH of the system to 5.5-6.3, then add laccase, continue stirring, and obtain the enzymatic pre-crosslinking functional finishing solution; S4. Immerse the pre-activated fabric in the enzymatic pre-crosslinking functional finishing solution to carry out the crosslinking enzymatic reaction. After the reaction is completed, adjust the pH of the system to 8.0-8.8, and then perform padding treatment. After the treatment is completed, the padded fabric is pre-dried, heat-fixed, washed, dehydrated and dried to obtain a multifunctional fabric.

2. The method for preparing the multifunctional fabric according to claim 1, characterized in that, The pretreatment solution in step S1 comprises the following components by mass percentage: 0.3-0.6% nonionic refining agent, 0.15-0.25% sodium bicarbonate, 0.04-0.08% sodium gluconate, 0.04-0.08% nonionic penetrant, and the balance being deionized water; the pH of the pretreatment solution is 7.5-8.

2.

3. The method for preparing the multifunctional fabric according to claim 1, characterized in that, The pre-activated enzyme solution in step S2 comprises the following components by mass percentage: 0.1-0.2% acidic cellulase, 0.04-0.08% acidic pectinase, 0.2-0.4% acetate-sodium acetate buffer, 0.03-0.06% isooctanol polyoxyethylene ether, and the balance being deionized water; the pH of the pre-activated enzyme solution is 5.6-6.

2.

4. The method for preparing the multifunctional fabric according to claim 1, characterized in that, In step S3, the mass ratio of the functional finishing agent, laccase, and deionized water is 1:0.03-0.06:50-70.

5. The method for preparing the multifunctional fabric according to claim 4, characterized in that, The preparation method of the functional finishing agent includes the following steps: A1. Add α-lipoic acid and natural phenolic acid to a mixed solvent and stir until completely dissolved. Add EDC and NHS and stir to react to obtain a carboxyl-activated solution. A2. Add ε-polylysine to deionized water, stir until completely dissolved, and adjust the pH of the system to 5.5-6.8 to obtain an ε-polylysine solution; A3. Under stirring, the carboxyl activation solution was added dropwise to the ε-polylysine solution. After the addition was complete, the reaction was continued by stirring. After the reaction was completed, the solution was concentrated by ultrafiltration to obtain the modified ε-polylysine solution. A4. Add taurine to deionized water and stir until completely dissolved. Add sodium carbonate and continue stirring until homogeneous to obtain sodium taurine solution. A5. Add cyanuric chloride to an acetone aqueous solution, stir well, then add sodium taurate solution. After the addition is complete, continue stirring the reaction. Control the pH of the system during the reaction to obtain the dichlorotriazine intermediate reaction solution. A6. Under stirring, the dichlorotriazine intermediate reaction solution was added to the modified ε-polylysine solution. After the addition was completed, the reaction was continued to be stirred. After the reaction was completed, the functional finishing agent was obtained through post-treatment.

6. The method for preparing the multifunctional fabric according to claim 5, characterized in that, In step A1, the mass ratio of α-lipoic acid, natural phenolic acid, EDC, NHS, and the mixed solvent is 1:0.45-0.65:1.4-1.6:0.6-0.7:60-70. In step A3, the volume ratio of the carboxyl activating solution to the ε-polylysine solution is 1:1.5-2.

5. In step A5, the mass ratio of cyanuric chloride, sodium taurate solution, and acetone aqueous solution is 1:7-9:18-22. In step A6, the volume ratio of the dichlorotriazine intermediate reaction solution to the modified ε-polylysine solution is 1:4-6.

7. The method for preparing the multifunctional fabric according to claim 1, characterized in that, In step S4, the mass ratio of the pre-activated fabric to the enzymatically pre-crosslinked functional finishing solution is 1:20-30.

8. The method for preparing the multifunctional fabric according to claim 1, characterized in that, The padding process in step S4 specifically involves immersing the pre-activated fabric in the enzyme-catalyzed pre-crosslinking functional finishing solution at room temperature for 20-30 minutes, followed by a three-dip, three-padding process. After each immersion, the fabric is rolled by a padding machine with a roller pressure of 0.25-0.35 MPa and a rolling speed of 1-2 m / min, while controlling the padding residue rate to be 70-85%.

9. The method for preparing the multifunctional fabric according to claim 1, characterized in that, The pre-drying and heat-fixing treatment in step S4 specifically involves pre-drying the impregnated fabric at a temperature of 75-85℃ for 3-5 minutes, followed by heat-fixing treatment at a temperature of 125-135℃ for 2-3 minutes.

10. A multifunctional fabric prepared by the method of any one of claims 1-9.

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