Modified tencel non-woven fabric and preparation method thereof

Abstract

The invention discloses a modified tencel non-woven fabric and a preparation method thereof, and belongs to the technical field of textiles. According to the modified tencel non-woven fabric, tencel non-woven fabric is used as gray fabric, a sodium hydroxide aqueous solution, a sulfuric acid aqueous solution and a DMF solution of epichlorohydrin are sequentially adopted for pretreatment, then antibacterial finishing liquid is adopted for antibacterial finishing, then the tencel non-woven fabric is put into dyeing finishing liquid for dyeing finishing, and finally the tencel non-woven fabric is put into antioxidant finishing liquid for antioxidant finishing, so that the modified tencel non-woven fabric is obtained. The modified tencel non-woven fabric is obtained; wherein the antibacterial finishing liquid is prepared from the following components in parts by weight: 25 to 35 parts of hyperbranched lysine copolymer and 1000 parts of water; the dyeing finishing liquid comprises the following components in parts by weight: 20-40 parts of an anionic dyeing agent, 10-30 parts of monobrominated diamine and 1000 parts of water; the antioxidant finishing liquid is prepared from the following components in parts by mass: 15 to 25 parts of gallic acid, 5 to 15 parts of N-acetyl-L-cysteine, 4 to 6 parts of aluminum trichloride and 100 parts of water.

Description

Technical Field

[0001] The invention relates to the technical field of modified Tencel nonwoven fabrics, and in particular to a modified Tencel nonwoven fabric and a preparation method thereof. Background Art

[0002] As society pays more and more attention to environmental protection and consumers' requirements for product quality continue to increase, natural cellulose-based materials have received more and more attention due to their renewability and biodegradability. Tencel (Lyocell), as a high-performance regenerated cellulose fiber, has become an indispensable part of the textile industry with its superior physical properties, soft and comfortable touch, and environmentally friendly production process. However, in practical applications, traditional Tencel nonwovens have encountered some challenges, which have limited its wide application and development potential to a certain extent.

[0003] Due to its unique molecular structure and surface characteristics, traditional Tencel nonwovens make it difficult for dyes to adhere evenly, resulting in inconsistent colors during the dyeing process and increasing the difficulty and cost of the dyeing process. In order to achieve the desired dyeing effect, additional dyes and auxiliary chemicals are usually required, which not only pushes up production costs, but may also have an adverse impact on the environment. In addition, even after successful dyeing, the color fastness of Tencel nonwovens is often insufficient and easily fades under washing, friction or light conditions, which is a major obstacle for clothing and home decoration products that focus on beauty and durability.

[0004] In key areas such as medical and sanitary products, antibacterial properties are an important criterion for measuring product quality. Unfortunately, traditional Tencel nonwovens do not perform well in this regard and cannot effectively prevent the reproduction of bacteria and other microorganisms, which may endanger the health of users. At the same time, dyed Tencel nonwovens will undergo oxidation reactions when exposed to air for a long time, causing color changes or fading, especially for susceptible colors such as dark blue and black. This color instability reduces the attractiveness of the product and also affects consumers' purchasing decisions, especially in outdoor or high humidity environments, where this problem is more significant.

[0005] In order to solve the above problems, the present invention provides a modified Tencel nonwoven fabric and a preparation method thereof. Summary of the invention

[0006] The purpose of the present invention is to provide a modified Tencel nonwoven fabric and a preparation method thereof, so as to solve the technical problems mentioned in the above background technology.

[0007] The present invention adopts the following technical solutions:

[0008] A modified Tencel nonwoven fabric is prepared by using Tencel nonwoven fabric as grey fabric, firstly pre-treating with sodium hydroxide aqueous solution, sulfuric acid aqueous solution and epichlorohydrin DMF solution in sequence, then performing antibacterial finishing with antibacterial finishing with antibacterial finishing liquid, then performing dyeing finishing with dyeing finishing liquid, and finally performing antioxidant finishing with antioxidant finishing with antioxidative finishing liquid to obtain the modified Tencel nonwoven fabric.

[0009] Furthermore, the antibacterial finishing liquid comprises, by weight, 25 to 35 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0010] Furthermore, the dyeing and finishing liquid comprises, by weight, 20 to 40 parts by weight of anionic dye, 10 to 30 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0011] The anionic dye includes any one or more combinations of cochineal red, sodium copper chlorophyllin, and gardenia yellow.

[0012] Furthermore, the antioxidant finishing liquid comprises, by weight, 15 to 25 parts of gallic acid, 5 to 15 parts of N-acetyl-L-cysteine, 4 to 6 parts of aluminum chloride, and 100 parts of water.

[0013] A method for preparing a modified Tencel nonwoven fabric comprises the following steps:

[0014] (1) pre-treating a Tencel non-woven fabric with a sodium hydroxide aqueous solution, a sulfuric acid aqueous solution, and a DMF solution of epichlorohydrin in sequence to obtain a pre-treated Tencel non-woven fabric;

[0015] (2) immersing the pretreated Tencel nonwoven fabric in an antibacterial finishing liquid for finishing to obtain an antibacterial finished Tencel nonwoven fabric;

[0016] (3) immersing the antibacterial treated Tencel nonwoven fabric into a dyeing and finishing liquid, immersing and rolling the Tencel nonwoven fabric to obtain the dyeing and finishing Tencel nonwoven fabric;

[0017] (4) The dyed Tencel nonwoven fabric is immersed in an antioxidant finishing liquid, and then subjected to double immersion and double rolling to obtain a modified Tencel nonwoven fabric.

[0018] Furthermore, the specific steps of step (1) are as follows: immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g: (40-60) mL for 5-6 hours, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 4-6wt% sulfuric acid aqueous solution at a bath ratio of 1g: (40-60) mL for 3-5 hours, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution. The Tencel non-woven fabric after treatment with the aqueous sulfuric acid solution was prepared; then, under nitrogen protection, the Tencel non-woven fabric after treatment with the aqueous sulfuric acid solution was immersed in a 20-40wt% DMF solution of epichlorohydrin at a bath ratio of 1g: (40-60)mL, and 0.5-0.7 times the mass of epichlorohydrin was added with a catalyst of ethyl triphenylphosphonium bromide, the temperature was raised to 80-100°C, the reaction was kept warm for 24h, the fabric was removed, and then washed with deionized water for 5-7 times, and dried at 40-60°C for 60-72h to obtain the pretreated Tencel non-woven fabric.

[0019] Furthermore, the specific steps of step (2) are as follows: immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g: (40-60)mL, cool to 0-5°C, keep warm for 1.8-2.2h, add 1.6-2.4 times the mass of the antibacterial finishing liquid of sodium hydroxide, oscillate at a constant temperature for 10-30min, keep warm for 55-65min, remove and drain, and then bake at 70°C-80°C for 4-6h to obtain the antibacterial finished Tencel non-woven fabric.

[0020] Furthermore, the preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine, tyrosine and N,N-dimethylamino acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine and N,N-dimethylamino acid is 8-10:2-4:1-3, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and 175-185°C, stirring and reacting for 5.5-6.5h; after the reaction is completed and cooled, stirring and dissolving with ethanol 60-100 times the mass of L-lysine, settling in ethyl acetate 10 times the mass of ethanol to obtain insoluble matter; dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing in a freeze dryer for freeze drying to obtain a hyperbranched lysine copolymer.

[0021] Furthermore, the specific steps of step (3) are as follows: immersing the antibacterial finished Tencel non-woven fabric into the dyeing finishing liquid according to the bath ratio of 1g: (40-60)mL, dipping and rolling, the immersion temperature is 50-70°C, the immersion time is 2.5-3.5h, the rolling rate is 80%-90%, and then pre-baking at 110-120°C for 3-6min, and then baking at 70-80°C for 4-6h to obtain the dyed Tencel non-woven fabric.

[0022] Furthermore, the specific steps of step (4) are as follows: immerse the dyed and finished Tencel non-woven fabric in an antioxidant finishing liquid at a bath ratio of 1g: (30-50)mL, perform two immersions and two rollings, the temperature of each immersion is 95-105°C, the duration of each immersion is 7-9h, the rolling rate of each time is 60%-80%, pre-bake at 110-120°C for 2-3min, and then bake at 60°C-70°C for 6-7h to obtain a modified Tencel non-woven fabric.

[0023] By adopting the above technical solution, the present invention has the following beneficial effects:

[0024] The modified Tencel non-woven fabric of the present invention uses Tencel non-woven fabric as the grey fabric, is firstly pretreated with sodium hydroxide aqueous solution, sulfuric acid aqueous solution and epichlorohydrin DMF solution in sequence, then antibacterial finishing is performed with antibacterial finishing liquid, then placed in dyeing finishing liquid for dyeing finishing, and finally placed in antioxidant finishing liquid for antioxidant finishing. The obtained modified Tencel non-woven fabric has good antibacterial property, antioxidant property, easy dyeing property, color fastness and anti-ultraviolet oxidation property.

[0025] The modified Tencel nonwoven fabric of the present invention is first pretreated with a sodium hydroxide aqueous solution, a sulfuric acid aqueous solution, and a DMF solution of epichlorohydrin in sequence, and the Tencel nonwoven fabric is swollen and activated to form a large number of active groups such as hydroxyl groups in the Tencel nonwoven fabric. Epichlorohydrin is ring-opened and grafted on the surface of the Tencel nonwoven fabric under the action of the hydroxyl groups. When antibacterial finishing is subsequently performed, the epichlorohydrin can react with part of the primary amines and tertiary amines in the hyperbranched lysine in the antibacterial finishing liquid to form tertiary amines and quaternary ammonium salts, thereby enhancing the antibacterial property of the Tencel nonwoven fabric after the antibacterial finishing.

[0026] The hyperbranched lysine copolymer of the invention is obtained by copolymerizing L-lysine, tyrosine and N,N-dimethylaminoformic acid through amino and carboxyl reaction, has good antibacterial property, and forms a large number of cavities on the surface of the hyperbranched lysine copolymer, so that the antibacterial finished Tencel non-woven fabric has certain adsorption property; during the antibacterial finishing, part of the primary amine and tertiary amine in the hyperbranched lysine react with the chlorine element grafted on the surface of the Tencel non-woven fabric to form tertiary amine and quaternary ammonium salt, so that the antibacterial property of the Tencel non-woven fabric after the antibacterial finishing is further increased, and the cationic property of the Tencel non-woven fabric after the antibacterial finishing is increased; during the subsequent dyeing treatment, the dyeing finishing liquid enters the interior of the hyperbranched lysine copolymer under the adsorption effect of the Tencel non-woven fabric after the antibacterial finishing, the anionic dye interacts with the quaternary ammonium salt with cationic property to be adsorbed, the bromine atoms on the monobromodiamine interact with the tertiary amine to be grafted to form the quaternary ammonium salt, the dye is firmly attached to the Tencel non-woven fabric, and the antibacterial property of the Tencel non-woven fabric after the dyeing finishing is enhanced.

[0027] The present invention also immerses the dyed Tencel non-woven fabric in an antioxidant finishing solution, and adds antioxidant gallic acid and N-acetyl-L-cysteine ​​to give the modified Tencel non-woven fabric better antioxidant performance, thereby preventing the dyed Tencel non-woven fabric from undergoing oxidation reaction after long-term exposure to air, resulting in color change or even fading; at the same time, gallic acid reacts and grafts with the benzene ring in the dyed Tencel non-woven fabric to form a benzophenone derivative, and when the benzophenone derivative absorbs ultraviolet photons, it transitions from a ground state to an excited state. In the excited state, benzophenone can convert the absorbed high-energy ultraviolet light into heat energy or low-energy visible light through a series of internal conversion and vibration relaxation processes, and releases it, thereby giving the modified Tencel non-woven fabric better anti-ultraviolet aging performance. DETAILED DESCRIPTION

[0028] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation methods.

[0029] The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention.

[0030] Example 1

[0031] A method for preparing a modified Tencel nonwoven fabric comprises the following steps:

[0032] (1) immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:40mL for 5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 4wt% sulfuric acid aqueous solution at a bath ratio of 1g:40mL for 3h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution; then immersing the Tencel non-woven fabric treated with a sulfuric acid aqueous solution in a 20wt% DMF solution of epichlorohydrin at a bath ratio of 1g:40mL under nitrogen protection, adding 0.5 times the mass of epichlorohydrin catalyst ethyltriphenylphosphonium bromide, heating to 80°C, keeping the temperature for reaction for 24h, removing it, then washing it with deionized water 5 times, and drying it at 40°C for 60h to obtain a pretreated Tencel non-woven fabric;

[0033] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:40mL, cool to 0°C, keep warm for 1.8h, add sodium hydroxide 1.6 times the mass of the antibacterial finishing liquid, oscillate at a constant temperature for 10min, keep warm for 55min, remove and drain, and bake at 70°C for 4h to obtain the antibacterial finished Tencel nonwoven fabric;

[0034] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g:40 mL, dipping and rolling, the dipping temperature is 50° C., the dipping time is 2.5 h, the rolling rate is 80%, and then pre-baking at 110° C. for 3 min, and then baking at 70° C. for 4 h to obtain the dyed and finished Tencel nonwoven fabric;

[0035] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing solution at a bath ratio of 1 g:30 mL, and the mixture was immersed twice and rolled twice. The temperature of each immersion was 95° C., the duration of each immersion was 7 h, and the rolling rate was 60% each time. The fabric was pre-baked at 110° C. for 2 min and then baked at 60° C. for 6 h to obtain a modified Tencel nonwoven fabric.

[0036] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine, tyrosine and N,N-dimethylamino acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine and N,N-dimethylamino acid is 8:2:1, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and 175°C, stirring and reacting for 5.5 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol 60 times the mass of L-lysine, settling in ethyl acetate 10 times the mass of ethanol to obtain insoluble matter; dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing in a freeze dryer for freeze drying to obtain the hyperbranched lysine copolymer.

[0037] The antibacterial finishing liquid comprises, by weight, 25 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0038] The dyeing and finishing liquid comprises, by weight, 20 parts by weight of anionic dye cochineal red, 10 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0039] The antioxidant finishing liquid comprises, by weight, 15 parts of gallic acid, 5 parts of N-acetyl-L-cysteine, 4 parts of aluminum chloride, and 100 parts of water.

[0040] Example 2

[0041] A method for preparing a modified Tencel nonwoven fabric comprises the following steps:

[0042] (1) immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:50mL for 5.5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 5wt% sulfuric acid aqueous solution at a bath ratio of 1g:50mL for 4h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution; then immersing the Tencel non-woven fabric treated with a sulfuric acid aqueous solution in a 30wt% DMF solution of epichlorohydrin at a bath ratio of 1g:50mL under nitrogen protection, adding 0.6 times the mass of epichlorohydrin catalyst ethyltriphenylphosphine bromide, heating to 90°C, keeping the reaction for 24h, removing it, then washing it with deionized water 6 times, and drying it at 50°C for 66h to obtain a pretreated Tencel non-woven fabric;

[0043] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:50mL, cool to 3°C, keep warm for 2h, add sodium hydroxide twice the mass of the antibacterial finishing liquid, oscillate at a constant temperature for 20min, keep warm for 60min, remove and drain, and bake at 75°C for 5h to obtain the antibacterial finished Tencel nonwoven fabric;

[0044] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g:50 mL, dipping and rolling, the dipping temperature is 60° C., the dipping time is 3 h, the rolling rate is 85%, and then pre-baking at 115° C. for 5 min, and then baking at 75° C. for 5 h to obtain the dyed and finished Tencel nonwoven fabric;

[0045] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing liquid at a bath ratio of 1 g:40 mL, and the fabric was immersed twice and rolled twice. The temperature of each immersion was 100° C., the duration of each immersion was 8 h, and the rolling rate was 70% each time. The fabric was pre-baked at 115° C. for 2.5 min and then baked at 65° C. for 6.5 h to obtain a modified Tencel nonwoven fabric.

[0046] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine, tyrosine and N,N-dimethylaminoformic acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine and N,N-dimethylaminoformic acid is 9:3:2, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and at 180°C, stirring and reacting for 6 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol with a mass of 80 times that of L-lysine, settling in ethyl acetate with a mass of 10 times that of ethanol to obtain insoluble matter; dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing the insoluble matter in a freeze dryer for freeze drying to obtain the hyperbranched lysine copolymer.

[0047] The antibacterial finishing liquid comprises, by weight, 30 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0048] The dyeing and finishing liquid comprises, by weight, 30 parts by weight of anionic dye cochineal red, 20 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0049] The antioxidant finishing liquid comprises, by weight, 20 parts of gallic acid, 10 parts of N-acetyl-L-cysteine, 5 parts of aluminum chloride, and 100 parts of water.

[0050] Example 3

[0051] A method for preparing a modified Tencel nonwoven fabric comprises the following steps:

[0052] (1) immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:60mL for 5.5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 6wt% sulfuric acid aqueous solution at a bath ratio of 1g:60mL for 5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution; then immersing the Tencel non-woven fabric treated with a sulfuric acid aqueous solution in a 40wt% DMF solution of epichlorohydrin at a bath ratio of 1g:60mL under nitrogen protection, adding 0.7 times the mass of epichlorohydrin catalyst ethyltriphenylphosphine bromide, heating to 100°C, keeping the temperature for reaction for 24h, removing it, then washing it with deionized water 7 times, and drying it at 60°C for 72h to obtain a pretreated Tencel non-woven fabric;

[0053] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:60mL, cool to 5°C, keep warm for 2.2 hours, add 2.4 times the mass of the antibacterial finishing liquid sodium hydroxide, shake at constant temperature for 30 minutes, keep warm for 65 minutes, remove and drain, and bake at 80°C for 6 hours to obtain the antibacterial finished Tencel nonwoven fabric;

[0054] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g: 60 mL, dipping and rolling, the dipping temperature is 70° C., the dipping time is 3.5 h, the rolling rate is 90%, and then pre-baking at 120° C. for 6 min, and then baking at 80° C. for 6 h to obtain the dyed and finished Tencel nonwoven fabric;

[0055] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing solution at a bath ratio of 1 g:50 mL, and the mixture was immersed twice and rolled twice. The temperature of each immersion was 105° C., the duration of each immersion was 9 h, and the rolling rate was 80% each time. The fabric was pre-baked at 120° C. for 3 min and then baked at 70° C. for 7 h to obtain a modified Tencel nonwoven fabric.

[0056] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine, tyrosine and N,N-dimethylaminoformic acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine and N,N-dimethylaminoformic acid is 10:4:3, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and 185°C, stirring and reacting for 6.5 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol with a mass of 100 times that of L-lysine, settling in ethyl acetate with a mass of 10 times that of ethanol to obtain insoluble matter; dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing the insoluble matter in a freeze dryer for freeze drying to obtain the hyperbranched lysine copolymer.

[0057] The antibacterial finishing liquid comprises, by weight, 35 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0058] The dyeing and finishing liquid comprises, by weight, 40 parts by weight of anionic dye cochineal red, 30 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0059] The antioxidant finishing liquid comprises, by weight, 25 parts of gallic acid, 15 parts of N-acetyl-L-cysteine, 6 parts of aluminum chloride, and 100 parts of water.

[0060] Comparative Example 1

[0061] The difference between Comparative Example 1 and Example 2 is that the modified Tencel nonwoven fabric in Comparative Example 1 is pretreated with sodium hydroxide aqueous solution and sulfuric acid aqueous solution in sequence; specifically:

[0062] A method for preparing a modified Tencel nonwoven fabric comprises the following steps:

[0063] (1) immersing the Tencel nonwoven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:50mL for 5.5h, removing it, washing it to neutrality, and obtaining a Tencel nonwoven fabric treated with the sodium hydroxide aqueous solution; then immersing the Tencel nonwoven fabric treated with the sodium hydroxide aqueous solution in a 5wt% sulfuric acid aqueous solution at a bath ratio of 1g:50mL for 4h, removing it, washing it to neutrality, and obtaining a pretreated Tencel nonwoven fabric;

[0064] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:50mL, cool to 3°C, keep warm for 2h, add sodium hydroxide twice the mass of the antibacterial finishing liquid, oscillate at a constant temperature for 20min, keep warm for 60min, remove and drain, and bake at 75°C for 5h to obtain the antibacterial finished Tencel nonwoven fabric;

[0065] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g:50 mL, dipping and rolling, the dipping temperature is 60° C., the dipping time is 3 h, the rolling rate is 85%, and then pre-baking at 115° C. for 5 min, and then baking at 75° C. for 5 h to obtain the dyed and finished Tencel nonwoven fabric;

[0066] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing liquid at a bath ratio of 1 g:40 mL, and the fabric was immersed twice and rolled twice. The temperature of each immersion was 100° C., the duration of each immersion was 8 h, and the rolling rate was 70% each time. The fabric was pre-baked at 115° C. for 2.5 min and then baked at 65° C. for 6.5 h to obtain a modified Tencel nonwoven fabric.

[0067] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine, tyrosine and N,N-dimethylaminoformic acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine and N,N-dimethylaminoformic acid is 9:3:2, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and at 180°C, stirring and reacting for 6 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol with a mass of 80 times that of L-lysine, settling in ethyl acetate with a mass of 10 times that of ethanol to obtain insoluble matter; dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing the insoluble matter in a freeze dryer for freeze drying to obtain the hyperbranched lysine copolymer.

[0068] The antibacterial finishing liquid comprises, by weight, 30 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0069] The dyeing and finishing liquid comprises, by weight, 30 parts by weight of anionic dye cochineal red, 20 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0070] The antioxidant finishing liquid comprises, by weight, 20 parts of gallic acid, 10 parts of N-acetyl-L-cysteine, 5 parts of aluminum chloride, and 100 parts of water.

[0071] Comparative Example 2

[0072] The difference between Comparative Example 2 and Example 2 is that the hyperbranched lysine copolymer in Comparative Example 2 is obtained by polymerizing only L-lysine; specifically: a method for preparing a modified Tencel nonwoven fabric, comprising the following steps:

[0073] (1) immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:50mL for 5.5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 5wt% sulfuric acid aqueous solution at a bath ratio of 1g:50mL for 4h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution; then immersing the Tencel non-woven fabric treated with a sulfuric acid aqueous solution in a 30wt% DMF solution of epichlorohydrin at a bath ratio of 1g:50mL under nitrogen protection, adding 0.6 times the mass of epichlorohydrin catalyst ethyltriphenylphosphine bromide, heating to 90°C, keeping the reaction for 24h, removing it, then washing it with deionized water 6 times, and drying it at 50°C for 66h to obtain a pretreated Tencel non-woven fabric;

[0074] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:50mL, cool to 3°C, keep warm for 2h, add sodium hydroxide twice the mass of the antibacterial finishing liquid, oscillate at a constant temperature for 20min, keep warm for 60min, remove and drain, and bake at 75°C for 5h to obtain the antibacterial finished Tencel nonwoven fabric;

[0075] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g:50 mL, dipping and rolling, the dipping temperature is 60° C., the dipping time is 3 h, the rolling rate is 85%, and then pre-baking at 115° C. for 5 min, and then baking at 75° C. for 5 h to obtain the dyed and finished Tencel nonwoven fabric;

[0076] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing liquid at a bath ratio of 1 g:40 mL, and the fabric was immersed twice and rolled twice. The temperature of each immersion was 100° C., the duration of each immersion was 8 h, and the rolling rate was 70% each time. The fabric was pre-baked at 115° C. for 2.5 min and then baked at 65° C. for 6.5 h to obtain a modified Tencel nonwoven fabric.

[0077] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine is completely dissolved in deionized water, wherein the mass ratio of L-lysine to deionized water is 9:1000, and then under nitrogen protection and 180° C., stirring and reacting for 6 hours, after the reaction is completed and cooled, stirring and dissolving with ethanol with a mass of 80 times that of L-lysine, settling in ethyl acetate with a mass of 10 times that of ethanol to obtain insoluble matter, dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing in a freeze dryer for freeze drying to obtain a hyperbranched lysine copolymer.

[0078] The antibacterial finishing liquid comprises, by weight, 30 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0079] The dyeing and finishing liquid comprises, by weight, 30 parts by weight of anionic dye cochineal red, 20 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0080] The antioxidant finishing liquid comprises, by weight, 20 parts of gallic acid, 10 parts of N-acetyl-L-cysteine, 5 parts of aluminum chloride, and 100 parts of water.

[0081] Comparative Example 3

[0082] The difference between Comparative Example 3 and Example 2 is that the hyperbranched lysine copolymer of Comparative Example 3 is obtained by copolymerization of L-lysine and tyrosine only; specifically: a method for preparing a modified Tencel nonwoven fabric, comprising the following steps:

[0083] (1) immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:50mL for 5.5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 5wt% sulfuric acid aqueous solution at a bath ratio of 1g:50mL for 4h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution; then immersing the Tencel non-woven fabric treated with a sulfuric acid aqueous solution in a 30wt% DMF solution of epichlorohydrin at a bath ratio of 1g:50mL under nitrogen protection, adding 0.6 times the mass of epichlorohydrin catalyst ethyltriphenylphosphine bromide, heating to 90°C, keeping the reaction for 24h, removing it, then washing it with deionized water 6 times, and drying it at 50°C for 66h to obtain a pretreated Tencel non-woven fabric;

[0084] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:50mL, cool to 3°C, keep warm for 2h, add sodium hydroxide twice the mass of the antibacterial finishing liquid, oscillate at a constant temperature for 20min, keep warm for 60min, remove and drain, and bake at 75°C for 5h to obtain the antibacterial finished Tencel nonwoven fabric;

[0085] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g:50 mL, dipping and rolling, the dipping temperature is 60° C., the dipping time is 3 h, the rolling rate is 85%, and then pre-baking at 115° C. for 5 min, and then baking at 75° C. for 5 h to obtain the dyed and finished Tencel nonwoven fabric;

[0086] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing liquid at a bath ratio of 1 g:40 mL, and the fabric was immersed twice and rolled twice. The temperature of each immersion was 100° C., the duration of each immersion was 8 h, and the rolling rate was 70% each time. The fabric was pre-baked at 115° C. for 2.5 min and then baked at 65° C. for 6.5 h to obtain a modified Tencel nonwoven fabric.

[0087] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine and tyrosine are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine is 9:3, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and at 180° C., stirring and reacting for 6 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol with a mass of 80 times that of L-lysine, settling in ethyl acetate with a mass of 10 times that of ethanol to obtain insoluble matter; dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing the insoluble matter in a freeze dryer for freeze drying to obtain a hyperbranched lysine copolymer.

[0088] The antibacterial finishing liquid comprises, by weight, 30 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0089] The dyeing and finishing liquid comprises, by weight, 30 parts by weight of anionic dye cochineal red, 20 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0090] The antioxidant finishing liquid comprises, by weight, 20 parts of gallic acid, 10 parts of N-acetyl-L-cysteine, 5 parts of aluminum chloride, and 100 parts of water.

[0091] Comparative Example 4

[0092] The difference between Comparative Example 4 and Example 2 is that the hyperbranched lysine copolymer of Comparative Example 4 is obtained by copolymerization of L-lysine and N,N-dimethylcarbamic acid only; specifically: a method for preparing a modified Tencel nonwoven fabric, comprising the following steps:

[0093] (1) immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:50mL for 5.5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 5wt% sulfuric acid aqueous solution at a bath ratio of 1g:50mL for 4h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution; then immersing the Tencel non-woven fabric treated with a sulfuric acid aqueous solution in a 30wt% DMF solution of epichlorohydrin at a bath ratio of 1g:50mL under nitrogen protection, adding 0.6 times the mass of epichlorohydrin catalyst ethyltriphenylphosphine bromide, heating to 90°C, keeping the reaction for 24h, removing it, then washing it with deionized water 6 times, and drying it at 50°C for 66h to obtain a pretreated Tencel non-woven fabric;

[0094] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:50mL, cool to 3°C, keep warm for 2h, add sodium hydroxide twice the mass of the antibacterial finishing liquid, oscillate at a constant temperature for 20min, keep warm for 60min, remove and drain, and bake at 75°C for 5h to obtain the antibacterial finished Tencel nonwoven fabric;

[0095] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g:50 mL, dipping and rolling, the dipping temperature is 60° C., the dipping time is 3 h, the rolling rate is 85%, and then pre-baking at 115° C. for 5 min, and then baking at 75° C. for 5 h to obtain the dyed and finished Tencel nonwoven fabric;

[0096] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing liquid at a bath ratio of 1 g:40 mL, and the fabric was immersed twice and rolled twice. The temperature of each immersion was 100° C., the duration of each immersion was 8 h, and the rolling rate was 70% each time. The fabric was pre-baked at 115° C. for 2.5 min and then baked at 65° C. for 6.5 h to obtain a modified Tencel nonwoven fabric.

[0097] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine and N,N-dimethylaminoformic acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to N,N-dimethylaminoformic acid is 9:2, and the mass ratio of N,N-dimethylaminoformic acid to deionized water is 0.45:1000; then, under nitrogen protection and 180° C., stirring and reacting for 6 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol with a mass of 80 times that of L-lysine, settling in ethyl acetate with a mass of 10 times that of ethanol to obtain insoluble matter; dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing the insoluble matter in a freeze dryer for freeze drying to obtain the hyperbranched lysine copolymer.

[0098] The antibacterial finishing liquid comprises, by weight, 30 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0099] The dyeing and finishing liquid comprises, by weight, 30 parts by weight of anionic dye cochineal red, 20 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0100] The antioxidant finishing liquid comprises, by weight, 20 parts of gallic acid, 10 parts of N-acetyl-L-cysteine, 5 parts of aluminum chloride, and 100 parts of water.

[0101] Comparative Example 5

[0102] The difference between Comparative Example 5 and Example 2 is that the dyeing and finishing liquid of Comparative Example 4 includes 50 parts by weight of anionic dye and 1000 parts by weight of water; specifically: a method for preparing a modified Tencel non-woven fabric, comprising the following steps:

[0103] (1) immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:50mL for 5.5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 5wt% sulfuric acid aqueous solution at a bath ratio of 1g:50mL for 4h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution; then immersing the Tencel non-woven fabric treated with a sulfuric acid aqueous solution in a 30wt% DMF solution of epichlorohydrin at a bath ratio of 1g:50mL under nitrogen protection, adding 0.6 times the mass of epichlorohydrin catalyst ethyltriphenylphosphine bromide, heating to 90°C, keeping the reaction for 24h, removing it, then washing it with deionized water 6 times, and drying it at 50°C for 66h to obtain a pretreated Tencel non-woven fabric;

[0104] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:50mL, cool to 3°C, keep warm for 2h, add sodium hydroxide twice the mass of the antibacterial finishing liquid, oscillate at a constant temperature for 20min, keep warm for 60min, remove and drain, and bake at 75°C for 5h to obtain the antibacterial finished Tencel nonwoven fabric;

[0105] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g:50 mL, dipping and rolling, the dipping temperature is 60° C., the dipping time is 3 h, the rolling rate is 85%, and then pre-baking at 115° C. for 5 min, and then baking at 75° C. for 5 h to obtain the dyed and finished Tencel nonwoven fabric;

[0106] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing liquid at a bath ratio of 1 g:40 mL, and the fabric was immersed twice and rolled twice. The temperature of each immersion was 100° C., the duration of each immersion was 8 h, and the rolling rate was 70% each time. The fabric was pre-baked at 115° C. for 2.5 min and then baked at 65° C. for 6.5 h to obtain a modified Tencel nonwoven fabric.

[0107] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine, tyrosine and N,N-dimethylaminoformic acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine is 9:3:2, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and at 180°C, stirring and reacting for 6 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol with a mass of 80 times that of L-lysine, settling in ethyl acetate with a mass of 10 times that of ethanol to obtain insoluble matter; dissolving the insoluble matter in deionized water, performing rotary evaporation, and placing the insoluble matter in a freeze dryer for freeze drying to obtain the hyperbranched lysine copolymer.

[0108] The antibacterial finishing liquid comprises, by weight, 30 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0109] The dyeing and finishing liquid comprises, by weight, 50 parts by weight of anionic dye cochineal red and 1000 parts by weight of water.

[0110] The antioxidant finishing liquid comprises, by weight, 20 parts of gallic acid, 10 parts of N-acetyl-L-cysteine, 5 parts of aluminum chloride, and 100 parts of water.

[0111] Comparative Example 6

[0112] The difference between Comparative Example 6 and Example 2 is that the antioxidant finishing solution of Comparative Example 6 includes 30 parts by weight of N-acetyl-L-cysteine, 4 to 6 parts by weight of aluminum chloride, and 100 parts by weight of water; specifically: a method for preparing a modified Tencel non-woven fabric, comprising the following steps:

[0113] (1) immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g:50mL for 5.5h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with a sodium hydroxide aqueous solution in a 5wt% sulfuric acid aqueous solution at a bath ratio of 1g:50mL for 4h, removing it, washing it to neutrality, and obtaining a Tencel non-woven fabric treated with a sulfuric acid aqueous solution; then immersing the Tencel non-woven fabric treated with a sulfuric acid aqueous solution in a 30wt% DMF solution of epichlorohydrin at a bath ratio of 1g:50mL under nitrogen protection, adding 0.6 times the mass of epichlorohydrin catalyst ethyltriphenylphosphonium bromide, heating to 90°C, keeping the temperature for reaction for 24h, removing it, then washing it with deionized water 6 times, and drying it at 50°C for 66h to obtain a pretreated Tencel non-woven fabric;

[0114] (2) Immerse the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g:50mL, cool to 3°C, keep warm for 2h, add sodium hydroxide twice the mass of the antibacterial finishing liquid, oscillate at a constant temperature for 20min, keep warm for 60min, remove and drain, and bake at 75°C for 5h to obtain the antibacterial finished Tencel nonwoven fabric;

[0115] (3) immersing the antibacterial treated Tencel nonwoven fabric into the dyeing and finishing liquid at a bath ratio of 1 g:50 mL, dipping and rolling, the dipping temperature is 60° C., the dipping time is 3 h, the rolling rate is 85%, and then pre-baking at 115° C. for 5 min, and then baking at 75° C. for 5 h to obtain the dyed and finished Tencel nonwoven fabric;

[0116] (4) The dyed Tencel nonwoven fabric was immersed in an antioxidant finishing liquid at a bath ratio of 1 g:40 mL, and the fabric was immersed twice and rolled twice. The temperature of each immersion was 100° C., the duration of each immersion was 8 h, and the rolling rate was 70% each time. The fabric was pre-baked at 115° C. for 2.5 min and then baked at 65° C. for 6.5 h to obtain a modified Tencel nonwoven fabric.

[0117] The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine, tyrosine and N,N-dimethylaminoformic acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine is 9:3:2, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and at 180°C, stirring and reacting for 6 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol with a mass of 80 times that of L-lysine, settling in ethyl acetate with a mass of 10 times that of ethanol to obtain insoluble matter; dissolving the insoluble matter in deionized water, performing rotary evaporation, and placing the insoluble matter in a freeze dryer for freeze drying to obtain the hyperbranched lysine copolymer.

[0118] The antibacterial finishing liquid comprises, by weight, 30 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

[0119] The dyeing and finishing liquid comprises, by weight, 30 parts by weight of anionic dye cochineal red, 20 parts by weight of monobromodiamine, and 1000 parts by weight of water.

[0120] The antioxidant finishing liquid comprises, by weight, 20 parts of gallic acid, 10 parts of N-acetyl-L-cysteine, 5 parts of aluminum chloride, and 100 parts of water.

[0121] Effect example:

[0122] Dyeing performance: applied to Kubelka-Munk function calculation: K / S=(1-R)2 / 2R; wherein: K-absorption coefficient of the object being measured; S-scattering coefficient of the object being measured; R-reflectivity of the object being measured with infinite thickness; tested by Datacolor SF 600X colorimeter, 5 measurements were performed on different parts of the modified Tencel nonwoven fabrics prepared in the embodiments and comparative examples, and then the mathematical average was taken.

[0123] Color fastness test: refer to GB / T3921.1-1997 to test the color fastness of the modified Tencel nonwoven fabrics prepared in the examples and comparative examples.

[0124] Antibacterial property: The antibacterial rate of Escherichia coli of the modified Tencel nonwoven fabrics prepared in the test examples and comparative examples was tested with reference to GB / T20944.3.

[0125] Anti-ultraviolet property: refer to GB / T8427 to test the color fastness of Escherichia coli of the modified Tencel non-woven fabrics prepared in the examples and comparative examples. The color fastness to sunlight is divided into 8 levels. The larger the value, the better the color fastness to sunlight, that is, level 1 is the worst and level 8 is the best.

[0126] Table 1 below shows the performance test results of the modified Tencel nonwoven fabrics prepared in the examples and comparative examples:

[0127] Table 1

[0128]

[0129]

[0130] As can be seen from Table 1, the modified Tencel nonwoven fabric prepared in the embodiment has good antibacterial property, antioxidant property, dyeability, color fastness, and anti-ultraviolet oxidation property.

[0131] Comparing Example 1 with Example 2, the modified Tencel non-woven fabric of Comparative Example 1 is pretreated only with sodium hydroxide aqueous solution and sulfuric acid aqueous solution in sequence; Example 2 is pretreated with DMF solution of epichlorohydrin, and the obtained modified Tencel non-woven fabric has good antibacterial properties, dyeability and color fastness.

[0132] Compared with Example 2, the hyperbranched lysine copolymer of Comparative Example 2 is obtained by polymerization of L-lysine only; the hyperbranched lysine copolymer of Example 2 is obtained by copolymerization of L-lysine, tyrosine and N,N-dimethylaminoformic acid through amino and carboxyl reactions, and the obtained modified Tencel non-woven fabric has good antibacterial properties, color fastness and UV oxidation resistance.

[0133] Compared with Example 2, the hyperbranched lysine copolymer of Comparative Example 3 is obtained by copolymerizing only L-lysine and tyrosine; the hyperbranched lysine copolymer of Example 2 is obtained by copolymerizing N,N-dimethylaminoformic acid through the reaction of amino and carboxyl groups, and the obtained modified Tencel non-woven fabric has good antibacterial properties and color fastness.

[0134] Compared with Example 2, the hyperbranched lysine copolymer of Comparative Example 4 is obtained by copolymerizing only L-lysine and N,N-dimethylaminoformic acid; the hyperbranched lysine copolymer of Example 2 is obtained by copolymerizing tyrosine through the reaction of amino and carboxyl groups, and the obtained modified Tencel non-woven fabric has good antibacterial and anti-ultraviolet oxidation properties.

[0135] Compared with Example 2, the dyeing and finishing liquid of Comparative Example 5 includes 50 parts by weight of anionic dye and 1000 parts by weight of water; the dyeing and finishing liquid of Example 2 uses monobromodiamine, and the modified Tencel non-woven fabric obtained has better antibacterial properties.

[0136] Compared with Example 2, the antioxidant finishing liquid of Comparative Example 6 includes 30 parts by weight of N-acetyl-L-cysteine, 4 to 6 parts by weight of aluminum chloride, and 100 parts by weight of water; the dyeing finishing liquid of Example 2 uses gallic acid, and the modified Tencel non-woven fabric obtained has good anti-ultraviolet oxidation properties.

[0137] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A modified Tencel nonwoven fabric, characterized in that: The modified Tencel nonwoven fabric is made of Tencel nonwoven fabric as grey fabric, which is first pretreated with sodium hydroxide aqueous solution, sulfuric acid aqueous solution and epichlorohydrin DMF solution in sequence, then antibacterial finishing is performed with antibacterial finishing liquid, then placed in dyeing finishing liquid for dyeing finishing, and finally placed in antioxidant finishing liquid for antioxidant finishing to obtain the modified Tencel nonwoven fabric.

2. The modified Tencel nonwoven fabric according to claim 1, characterized in that: The antibacterial finishing liquid comprises, by weight, 25 to 35 parts by weight of a hyperbranched lysine copolymer and 1000 parts by weight of water.

3. The modified Tencel nonwoven fabric according to claim 1, characterized in that: The dyeing and finishing liquid comprises, by weight, 20 to 40 parts by weight of anionic dye, 10 to 30 parts by weight of monobromodiamine, and 1000 parts by weight of water.

4. The modified Tencel nonwoven fabric according to claim 1, characterized in that: The antioxidant finishing liquid comprises, by weight, 15 to 25 parts of gallic acid, 5 to 15 parts of N-acetyl-L-cysteine, 4 to 6 parts of aluminum chloride, and 100 parts of water.

5. A method for preparing the modified Tencel nonwoven fabric according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) pre-treating a Tencel non-woven fabric with a sodium hydroxide aqueous solution, a sulfuric acid aqueous solution, and a DMF solution of epichlorohydrin in sequence to obtain a pre-treated Tencel non-woven fabric; (2) immersing the pretreated Tencel nonwoven fabric in an antibacterial finishing liquid for finishing to obtain an antibacterial finished Tencel nonwoven fabric; (3) immersing the antibacterial treated Tencel nonwoven fabric into a dyeing and finishing liquid, immersing and rolling the Tencel nonwoven fabric to obtain the dyeing and finishing Tencel nonwoven fabric; (4) The dyed Tencel nonwoven fabric is immersed in an antioxidant finishing liquid, and then subjected to double immersion and double rolling to obtain a modified Tencel nonwoven fabric.

6. The method for preparing the modified Tencel nonwoven fabric according to claim 5, characterized in that: The specific steps of step (1) are as follows: immersing the Tencel non-woven fabric in a 20wt% sodium hydroxide aqueous solution at a bath ratio of 1g: (40-60)mL for 5-6h, taking it out, washing it to neutrality, and obtaining the Tencel non-woven fabric treated with the sodium hydroxide aqueous solution; then immersing the Tencel non-woven fabric treated with the sodium hydroxide aqueous solution in a 4-6wt% sulfuric acid aqueous solution at a bath ratio of 1g: (40-60)mL for 3-5h, taking it out, washing it to neutrality, and obtaining the Tencel non-woven fabric treated with the sulfuric acid aqueous solution; Subsequently, under nitrogen protection conditions, the Tencel non-woven fabric treated with the sulfuric acid aqueous solution was immersed in a 20-40wt% DMF solution of epichlorohydrin at a bath ratio of 1g: (40-60)mL, and 0.5-0.7 times the mass of epichlorohydrin as a catalyst ethyltriphenylphosphonium bromide was added, the temperature was raised to 80-100°C, the reaction was kept warm for 24 hours, and the fabric was taken out, then washed with deionized water for 5-7 times, and dried at 40-60°C for 60-72 hours to obtain the pretreated Tencel non-woven fabric.

7. The method for preparing the modified Tencel nonwoven fabric according to claim 5, characterized in that: The specific steps of step (2) are as follows: immersing the pretreated fabric in the antibacterial finishing liquid at a bath ratio of 1g: (40-60)mL, cooling to 0-5°C, keeping warm for 1.8-2.2h, adding sodium hydroxide 1.6-2.4 times the mass of the antibacterial finishing liquid, oscillating at a constant temperature for 10-30min, keeping warm for 55-65min, taking out and draining, and then baking at 70-80°C for 4-6h to obtain the antibacterial finished Tencel nonwoven fabric.

8. The method for preparing the modified Tencel nonwoven fabric according to claim 7, characterized in that: The preparation steps of the hyperbranched lysine copolymer are as follows: L-lysine, tyrosine and N,N-dimethylamino acid are completely dissolved in deionized water, wherein the molar ratio of L-lysine to tyrosine and N,N-dimethylamino acid is 8-10:2-4:1-3, and the mass ratio of tyrosine to deionized water is 0.45:1000; then, under nitrogen protection and 175-185° C., stirring and reacting for 5.5-6.5 hours; after the reaction is completed and cooled, stirring and dissolving with ethanol 60-100 times the mass of L-lysine, settling in ethyl acetate 10 times the mass of ethanol to obtain insoluble matter; dissolving the insoluble matter with deionized water, performing rotary evaporation, and placing in a freeze dryer for freeze drying to obtain the hyperbranched lysine copolymer.

9. The method for preparing the modified Tencel nonwoven fabric according to claim 5, characterized in that: The specific steps of step (3) are as follows: immersing the antibacterial finished Tencel non-woven fabric into the dyeing finishing liquid at a bath ratio of 1g: (40-60)mL, immersing and rolling, the immersion temperature is 50-70°C, the immersion time is 2.5-3.5h, the rolling rate is 80%-90%, and then pre-baking at 110-120°C for 3-6min, and then baking at 70-80°C for 4-6h to obtain the dyed Tencel non-woven fabric.

10. The method for preparing the modified Tencel nonwoven fabric according to claim 5, characterized in that: The specific steps of step (4) are as follows: immersing the dyed and finished Tencel non-woven fabric in an antioxidant finishing liquid at a bath ratio of 1 g: (30-50) mL, dipping and rolling twice, the temperature of each immersion is 95-105° C., the duration of each immersion is 7-9 hours, the rolling rate of each time is 60%-80%, pre-baking at 110-120° C. for 2-3 minutes, and then baking at 60° C. to 70° C. for 6-7 hours to obtain a modified Tencel non-woven fabric.

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