Finishing method for antibacterial fabrics with high color stability

Abstract

The present invention provides a finishing method for antibacterial fabrics with high color stability. The method comprises first using calcined kaolin with a diameter of less than 1000 nm as a carrier to adsorb silver ions, an antioxidant, and an anti-ultraviolet agent to obtain antibacterial composite particles. The antibacterial composite particles are then mixed with various organic reagents to obtain a silver-based antibacterial finishing solution. The fabric to be finished is then padded with the silver-based antibacterial finishing solution and then dried and baked to obtain the antibacterial fabric with high color stability. During the finishing process, acrylic acid undergoes esterification reactions with the kaolin, acrylic acid with the fabric to be finished, and acrylic acid with modified starch. Simultaneously, acrylic acid and butyl acrylate polymerize, resulting in a copolymer of acrylic acid and butyl acrylate that forms a linking polymer between the fabric, kaolin nanoparticles, and starch. The resulting mixed system forms a stable film on the fabric surface, ensuring long-term stability of the fabric's functionality achieved through finishing.

Description

Technical Field

[0001] The invention relates to the technical field of post-finishing of antibacterial fabrics, in particular to a post-finishing method of antibacterial fabrics with high color stability. Background Art

[0002] Microbial growth poses a significant threat to public health, making antimicrobial textiles of great social value. Silver-based antimicrobials are widely used in the manufacture of antimicrobial textiles due to their excellent antimicrobial properties, high bactericidal efficiency, and resistance to developing drug resistance. However, exposure to light or oxidation can cause silver-based antimicrobials to discolor and darken, affecting the appearance of the fabric and potentially reducing its antimicrobial properties.

[0003] Patent application number CN201110321735.0 discloses a method for preparing a composite antibacterial softener. The method involves first mixing an acrylic emulsion, an emulsifier, and a solubilizer in deionized water, stirring uniformly, heating the mixture, and then adding a low-yellowing amino silicone oil at high speed and stirring. Deionized water is then added and stirring continues at high speed to produce a mixed emulsion. An antibacterial component is then added to the mixed emulsion, and the mixed solution is rapidly stirred at room temperature and atmospheric pressure to produce the composite antibacterial softener. While the composite antibacterial softener obtained by this method exhibits some antibacterial properties, it still fails to address the problem of silver-based antibacterial agents being susceptible to discoloration. Therefore, developing a novel antibacterial fabric that can prevent silver-based antibacterial agents from discoloring under light and oxidative conditions, thereby addressing fabric stability issues, is of great significance.

[0004] In view of this, it is necessary to design an improved finishing method for antibacterial fabrics with high color stability to solve the above problems. Summary of the Invention

[0005] The present invention aims to provide a post-finishing method for antibacterial fabrics with high color stability. The method comprises the following steps: firstly, an antibacterial agent, an antioxidant and an anti-ultraviolet agent are attached to the surface and internal pores of kaolin; secondly, a silver-based antibacterial post-finishing liquid is prepared; and finally, the fabric to be finished is placed in the silver-based antibacterial post-finishing liquid for padding. In the subsequent drying and baking processes, esterification reactions occur between acrylic acid and kaolin, acrylic acid and the fabric to be finished, and acrylic acid and modified starch. Simultaneously, polymerization of acrylic acid and butyl acrylate occurs, so that a copolymer of acrylic acid and butyl acrylate becomes a linking polymer between the fabric, kaolin nanoparticles and starch. The mixed system after polymerization forms a stable film on the surface of the fabric. The functionality of the fabric obtained by post-finishing has long-term stability.

[0006] To achieve the above-mentioned object of the invention, the present invention provides a finishing method for antibacterial fabric with high color stability, comprising the following steps:

[0007] S1. A calcined kaolin having a diameter of less than 1000 nm is used as a carrier to adsorb silver ions, an antioxidant and an anti-ultraviolet agent to obtain antibacterial composite particles; the proportions of silver ions, antioxidants and anti-ultraviolet agents in the antibacterial composite particles are 35-40%, 5-10% and 3-5% of the total mass of the antibacterial composite particles, respectively;

[0008] S2. Prepare an aqueous finishing agent containing 10-15 parts by weight of the antibacterial composite particles, 25-30 parts by weight of acrylic acid, 15-25 parts by weight of butyl acrylate, 8-15 parts by weight of modified starch, 5-10 parts by weight of sodium lauryl sulfate, 3-5 parts by weight of dodecylphenol polyoxyethylene ether, 1-3 parts by weight of ammonium persulfate, 3-5 parts by weight of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 3-5 parts by weight of N-hydroxysuccinimide to obtain a silver-based antibacterial finishing solution;

[0009] S3. The fabric to be finished is first impregnated with the silver-based antibacterial finishing solution obtained in step S2, and then dried and baked to obtain an antibacterial fabric with high color stability.

[0010] As a further improvement of the present invention, in step S1, the particle size of the kaolin is 100-1000 nm.

[0011] As a further improvement of the present invention, in step S3, the liquid carrying rate of the fabric to be treated after padding is 50%-200%.

[0012] As a further improvement of the present invention, in step S3, the drying temperature is 60-70°C, and the baking temperature is 110-120°C.

[0013] As a further improvement of the present invention, in step S1, kaolin is used as a carrier to adsorb silver ions, antioxidants and anti-ultraviolet agents. Specifically, the kaolin is first placed in a saturated concentration of silver nitrate solution and soaked for 30-50 minutes to adsorb silver ions; then the kaolin adsorbed with silver ions is placed in a mixed solution of saturated concentrations of antioxidants and anti-ultraviolet agents and soaked for 30-50 minutes to adsorb the antioxidants and anti-ultraviolet agents.

[0014] As a further improvement of the present invention, in step S2, the preparation method of the silver-based antibacterial finishing liquid is specifically as follows: 25-30 parts by weight of acrylic acid, 15-25 parts by weight of butyl acrylate, 8-15 parts by weight of modified starch, 5-10 parts by weight of sodium lauryl sulfate, 3-5 parts by weight of dodecylphenol polyoxyethylene ether, 1-3 parts by weight of ammonium persulfate, 3-5 parts by weight of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 3-5 parts by weight of N-hydroxysuccinimide are fully stirred and dissolved in water, and then 10-15 parts by weight of antibacterial composite particles are added; in the silver-based antibacterial finishing liquid, the total concentration of the antibacterial composite particles, acrylic acid, butyl acrylate, modified starch, sodium lauryl sulfate, dodecylphenol polyoxyethylene ether, ammonium persulfate, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and N-hydroxysuccinimide is about 15-20 g / L.

[0015] As a further improvement of the present invention, in step S1, the antioxidant is one of butylated hydroxyanisole, butylated hydroxytoluene, propyl gallate or tert-butylhydroquinone.

[0016] As a further improvement of the present invention, in step S1, the anti-ultraviolet agent is a benzophenone or benzotriazole compound.

[0017] As a further improvement of the present invention, in step S3, the fabric to be finished is cotton or linen fabric.

[0018] As a further improvement of the present invention, in step S3, the softness of the obtained high color stability antibacterial fabric is 4.2-5.6 mm, the initial antibacterial rate is 95.6%-100%, the light antibacterial rate is 94.2%-100%, the oxidation antibacterial rate is as high as 93.8%-100%, and the antibacterial rate after washing 15 times is as high as 89.7%-96.9%; when the initial whiteness level is 4, the oxidation whiteness level and the light whiteness level are as high as level 4.

[0019] The beneficial effects of the present invention are:

[0020] (1) The post-finishing method of the antibacterial fabric with high color stability provided by the present invention first selects calcined kaolin with a suitable particle size, so that the antibacterial agent, antioxidant and anti-ultraviolet agent are all attached to the surface and internal pores of the kaolin.

[0021] Then, a silver-based antibacterial finishing liquid is prepared. The surface of the calcined kaolin contains abundant hydroxyl groups. The acrylic acid small molecules interact with the hydroxyl groups on the surface of the kaolin through hydrogen bonds, thereby being evenly distributed and wrapped on the surface of the kaolin.

[0022] Finally, the fabric to be treated is placed in a silver-based antibacterial finishing solution for padding. Compared with polymer solutions, the finishing agent composed of various small molecular substances can be more evenly distributed on the fabric surface during the padding process of the fabric to be treated. Subsequently, four chemical reactions will occur during the finishing process: (1) esterification reaction between acrylic acid and the hydroxyl groups on the surface of kaolin; (2) esterification reaction between acrylic acid and the hydroxyl groups on the surface of cotton and linen fabrics; (3) esterification reaction between acrylic acid and the hydroxyl groups on modified starch; (4) ammonium persulfate is heated to produce free radicals, which trigger free radical polymerization of acrylic acid and butyl acrylate. Based on the above four chemical reactions, the copolymer of acrylic acid and butyl acrylate becomes a linking polymer between the fabric, kaolin nanoparticles, and starch, and the mixed system after the polymerization forms a stable film on the fabric surface, so that the functionality obtained by the fabric through finishing has long-term stability.

[0023] Furthermore, using acrylic acid alone as the linking polymer results in a stiff film with a poor hand feel. Adding butyl acrylate can reduce the regularity within the polymer, while adding modified starch and dodecylphenol polyoxyethylene ether can reduce the interactions between acrylic acid polymers, further enhancing the fabric's softness and improving its hand feel. Furthermore, the carboxyl groups in acrylic acid possess excellent hydrophilicity, allowing them to maintain this excellent hydrophilicity even after antibacterial finishing.

[0024] (2) The present invention provides a finishing method for high color stability antibacterial fabrics. Kaolin has a large specific surface area, which can achieve high-dose loading of silver ions, antioxidants, and anti-ultraviolet agents. The hollow structure of kaolin can slow down the heat conduction rate in the particles, thereby improving the thermal stability of the load. In addition, the membrane structure on the surface of kaolin can protect the silver ions, antioxidants, and anti-ultraviolet agents adsorbed in the kaolin, thereby improving the stability of the antibacterial composite particles. Finally, an antibacterial fabric with stable performance and high color stability is obtained.

[0025] (3) The fabric obtained by the post-finishing method of the antibacterial fabric with high color stability provided by the present invention can prevent the silver-based antibacterial agent from changing color under light and oxidation conditions, and is particularly suitable for cotton and linen fabrics composed of cellulose basic units. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the reaction between the fabric to be finished and the silver-based antibacterial finishing liquid.

[0027] Figure 2 This is a graph showing the color fastness performance of the fabric after finishing in Example 1. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0030] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0031] The present invention provides a finishing method for antibacterial fabrics with high color stability, comprising the following steps:

[0032] S1. Preparation of antibacterial composite particles:

[0033] Calcined kaolin with a diameter of less than 1000 nm is used as a carrier to adsorb silver ions, antioxidants and anti-ultraviolet agents. Specifically, the kaolin is first placed in a saturated concentration silver nitrate solution and soaked for 30-50 minutes to adsorb silver ions; then the kaolin adsorbed with silver ions is placed in a mixed solution of saturated concentration antioxidants and anti-ultraviolet agents and soaked for 30-50 minutes to adsorb the antioxidants and anti-ultraviolet agents, thereby obtaining a composite kaolin antibacterial complex, i.e., antibacterial composite particles.

[0034] The silver ions, antioxidant, and anti-ultraviolet agent in the antibacterial composite particles comprise 35-40%, 5-10%, and 3-5% of the total mass of the antibacterial composite particles, respectively, with the remainder being kaolin. The antioxidant is selected from butylated hydroxyanisole, butylated hydroxytoluene, propyl gallate, tert-butylhydroquinone, or other common antioxidants. The anti-ultraviolet agent is selected from benzophenone, benzotriazole, or other common anti-ultraviolet agents.

[0035] Preferably, the kaolin particle size is 100-1000 nm. This is primarily because, when the kaolin particle size is too large, not only will the smaller specific surface area of ​​large-diameter kaolin lead to a decrease in the amount of antimicrobial agents, antioxidants, and UV inhibitors adsorbed by the kaolin, thereby affecting the antimicrobial properties and color fastness of the fabric, but it will also reduce the softness of the textile, affecting its wearing performance. It will also weaken the bonding between the kaolin and the fabric, making the particles more likely to fall off after friction, thus affecting its performance. When the kaolin particle size is too small, the kaolin particles tend to agglomerate, affecting their uniform distribution on the fabric surface and, in turn, their performance.

[0036] S2. Preparation of silver-based antibacterial finishing solution:

[0037] An aqueous post-finishing agent comprising 10-15 parts by weight of antibacterial composite particles, 25-30 parts by weight of acrylic acid, 15-25 parts by weight of butyl acrylate, 8-15 parts by weight of modified starch, 5-10 parts by weight of sodium lauryl sulfate, 3-5 parts by weight of dodecylphenol polyoxyethylene ether, 1-3 parts by weight of ammonium persulfate, 3-5 parts by weight of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 3-5 parts by weight of N-hydroxysuccinimide is prepared to obtain a silver-based antibacterial post-finishing liquid. The total concentration of the antibacterial composite particles, acrylic acid, butyl acrylate, modified starch, sodium lauryl sulfate, dodecylphenol polyoxyethylene ether, ammonium persulfate, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and N-hydroxysuccinimide in the silver-based antibacterial post-finishing liquid is about 15-20 g / L.

[0038] The preparation method of the silver-based antibacterial finishing liquid is specifically as follows: 25-30 parts by weight of acrylic acid, 15-25 parts by weight of butyl acrylate, 8-15 parts by weight of modified starch, 5-10 parts by weight of sodium lauryl sulfate, 3-5 parts by weight of dodecylphenol polyoxyethylene ether, 1-3 parts by weight of ammonium persulfate, 3-5 parts by weight of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 3-5 parts by weight of N-hydroxysuccinimide are fully stirred and dissolved in water, and then 10-15 parts by weight of antibacterial composite particles are added.

[0039] During this process, the presence of sodium lauryl sulfate and dodecylphenol polyoxyethylene ether makes the distribution of various substances in the silver-based antibacterial finishing solution more uniform, thereby achieving a more uniform finishing effect. The presence of modified starch and dodecylphenol polyoxyethylene ether can modify the feel of the finished fabric. At the same time, the presence of butyl acrylate can further enhance the softness of the finished fabric, thereby improving its feel.

[0040] The surface of calcined kaolin contains abundant hydroxyl groups. Acrylic acid small molecules will bond with the hydroxyl groups on the surface of kaolin through hydrogen bonds, thereby being evenly distributed and wrapped on the surface of kaolin.

[0041] S3. Padding of fabric to be treated

[0042] The fabric to be finished is placed in a silver-based antibacterial finishing liquid for padding, ensuring that the liquid carrying rate of the fabric to be finished after padding is 50%-200%. Since the silver-based antibacterial finishing liquid used in the present invention contains a large amount of small molecule compounds, especially acrylic acid small molecules and butyl acrylate small molecules, compared with a polymer solution, during the padding process of the fabric to be finished, various substances in the finishing agent mainly composed of small molecules can be more evenly distributed on the fabric surface, thereby ensuring that the silver-based antibacterial finishing liquid is evenly adhered to the surface and interior of the fabric to be finished; the fabric to be finished is then dried at 60-70°C for 30-50 minutes; and then baked at 110-120°C for 30-50 minutes to obtain an antibacterial fabric with high color stability.

[0043] Among them, the fabrics to be treated are cotton and linen fabrics.

[0044] like Figure 1 As shown in the schematic diagram, during the post-finishing process of the fabric to be finished, a series of chemical reactions will occur between the various substances: (1) acrylic acid will undergo an esterification reaction with the hydroxyl groups on the surface of kaolin, and will be more tightly wrapped on the surface of kaolin; especially in the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide, the rate of the esterification reaction will be faster; (2) acrylic acid will undergo an esterification reaction with the abundant hydroxyl groups on the surface of the fabric to be finished (cotton, linen fabric), thereby being evenly and firmly bonded to the surface of the fabric to be finished; (3) acrylic acid can also undergo an esterification reaction with the hydroxyl groups of modified starch; (4) ammonium persulfate generates free radicals when heated, which triggers free radical polymerization of acrylic acid and butyl acrylate to generate a polymer of acrylic acid and butyl acrylate, which is evenly wrapped on the surface of kaolin. As the four chemical reactions proceed, acrylic acid molecules react with kaolin, the fabric to be finished, and modified starch. Meanwhile, acrylic acid polymerizes with butyl acrylate, bonding the kaolin, fabric to be finished, and modified starch together. This results in the fabric surface being rich in kaolin and modified starch. This means the copolymer of acrylic acid and butyl acrylate becomes the linking polymer between the fabric to be finished, kaolin nanoparticles, and modified starch. The resulting mixed system forms a stable film on the fabric surface, ensuring the long-term stability of the fabric's post-finishing functionality. Furthermore, the molecular chains of the macromolecules on the fabric surface intertwine with those of other molecules in the silver-based antibacterial post-finishing solution, adsorbing these other functional molecules onto the fabric surface.

[0045] During the drying and baking process, firstly, the polymer on the surface of kaolin can protect the silver ions, antioxidants and anti-ultraviolet agents adsorbed in the kaolin, thereby improving the stability of the antibacterial composite particles; secondly, the hollow structure of kaolin itself can further slow down the heat conduction rate within the particles, thereby improving the thermal stability of the load; ultimately, an antibacterial fabric with stable performance and high color stability is obtained.

[0046] The present invention is described in detail below through a number of embodiments.

[0047] Example 1

[0048] A finishing method for antibacterial fabric with high color stability comprises the following steps:

[0049] S1. Preparation of antibacterial composite particles:

[0050] Calcined kaolin with a diameter of 500 nm is used as a carrier to adsorb silver ions, butylated hydroxyanisole and benzophenone compounds. The kaolin is first immersed in a saturated silver nitrate solution for 40 minutes to adsorb the silver ions; then the kaolin adsorbed with silver ions is immersed in a saturated mixed solution of antioxidants and anti-ultraviolet agents for 40 minutes to adsorb the antioxidants and anti-ultraviolet agents, thereby obtaining a composite kaolin antibacterial complex, i.e., antibacterial composite particles.

[0051] The proportions of silver ions, antioxidants and anti-ultraviolet agents in the antibacterial composite particles to the total mass of the antibacterial composite particles are 35%, 7% and 4% respectively.

[0052] S2. Preparation of silver-based antibacterial finishing solution:

[0053] An aqueous post-finishing agent containing antibacterial composite particles, acrylic acid, butyl acrylate, modified starch, sodium lauryl sulfate, polyoxyethylene dodecylphenol ether, ammonium persulfate, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and N-hydroxysuccinimide is prepared to obtain a silver-based antibacterial post-finishing liquid. Specifically, 25 parts by weight of acrylic acid, 20 parts by weight of butyl acrylate, 8 parts by weight of modified starch, 8 parts by weight of sodium lauryl sulfate, 4 parts by weight of polyoxyethylene dodecylphenol ether, 2 parts by weight of ammonium persulfate, 4 parts by weight of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 4 parts by weight of N-hydroxysuccinimide are thoroughly stirred and dissolved in water, and then 10 parts by weight of the antibacterial composite particles are added to obtain the silver-based antibacterial post-finishing liquid.

[0054] S3. Padding of fabric to be treated

[0055] The fabric to be treated is placed in a silver-based antibacterial post-treatment liquid for padding, ensuring that the liquid carrying rate of the fabric to be treated after padding is 150%, and then the fabric to be treated is dried at 65°C for 40 minutes; then baked at 110°C for 40 minutes to obtain an antibacterial fabric with high color stability.

[0056] Depend on Figure 1 It can be seen that after the finished fabric obtained in Example 1 was rolled up and stored for 3 months, the color of the fabric remained basically unchanged, further demonstrating that the antibacterial fabric obtained in the present invention has excellent performance.

[0057] Examples 2-3 and Comparative Examples 1-2

[0058] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that in step S1, the particle size of the calcined kaolin is different. Other details are substantially the same as Example 1 and will not be repeated here.

[0059] The high color stability antibacterial fabrics obtained in Examples 1-3 and Comparative Examples 1-2 were subjected to performance tests. The results are shown in Table 1:

[0060] Softness is measured using a fabric stiffness meter, according to GB / T 18318-2001, "Textile fabrics - Determination of bending length." The smaller the value measured using the fabric stiffness meter, the softer the fabric. The softness of the unfinished fabric is 4.1 mm.

[0061] Antibacterial rate testing follows GB / T 20944.3-2008, "Evaluation of the Antimicrobial Properties of Textiles - Oscillation Method," and the test data is the antibacterial rate against Escherichia coli. The basic principle of the oscillation method is to place the sample and control into Erlenmeyer flasks containing a test bacterial solution of a certain concentration. The solution is then shaken at a specified temperature for a specified time. The viable bacterial concentration in the flask is measured before and after the shaking period, and the inhibition rate is calculated to evaluate the antibacterial effect.

[0062] The initial antibacterial rate is to cut the fabric to be treated into 5cm×5cm size and test the antibacterial rate.

[0063] The light antibacterial rate is measured by cutting the treated fabric into 5cm x 5cm pieces and irradiating them with 300-400nm light for 30 minutes. The changes in the initial antibacterial rate and the light antibacterial rate can indicate the antibacterial and UV resistance of the treated fabric.

[0064] The oxidation antibacterial rate is the antibacterial rate measured after cutting the treated fabric into 5cm×5cm pieces and placing them in the air for 3 months (away from light or in a place without direct sunlight). The changes in the initial antibacterial rate and the oxidation antibacterial rate can explain the antibacterial and antioxidant properties of the treated fabric after treatment.

[0065] In order to facilitate the observation of changes in fiber color, the finished fabrics in this application are all white, and the whiteness grade of the fibers is detected using FZ / T01068-2009 "White Sample Card for Evaluating the Whiteness of Textiles". The whiteness grade of the fibers is divided into 5 grades, with grade 5 being the highest and grade 1 being the lowest. White antibacterial textiles containing silver ions will change from white to gray-black under ultraviolet light or long-term natural oxidation conditions. In the present invention, the anti-ultraviolet and anti-oxidation color stability of the fabric is evaluated by the change in whiteness grade. (After oxidation or ultraviolet light, when the whiteness remains at grade four or drops from grade four to grade three, there is basically no obvious change in color, indicating that the whiteness is basically stable, and the fiber's anti-ultraviolet and anti-oxidation properties are good at this time; when the whiteness grade drops from grade four to grade two or grade one, the fiber will undergo obvious changes, indicating that the fiber's anti-ultraviolet and anti-oxidation properties are poor at this time.)

[0066] Initial whiteness grade is a test of the whiteness of the fabric after finishing.

[0067] The oxidation whiteness grade is the whiteness grade measured after the finished fabric is placed in air for 3 months (away from light or direct sunlight). The change between the initial whiteness grade and the oxidation whiteness grade can indicate the color fastness to oxidation of the finished fabric.

[0068] The specific testing method for light whiteness grade is to treat the fiber with light according to the irradiation method in GB / T 8427-2019, "Textiles—Tests for Color Fastness—Color Fastness to Artificial Light: Xenon Arc Light." Then, the whiteness grade of the finished fabric before and after light exposure is tested using the white scale in FZ / T01068-2009, "Assessing the Whiteness of Textiles." The change in the initial whiteness grade and the light whiteness grade can be used to indicate the color fastness of the finished fabric to light.

[0069] Oxidation whiteness grade after washing 15 times: The whiteness grade of the finished fabric is measured after washing it 15 times and then placing it in the air for 3 months (avoiding light or in a place without direct sunlight).

[0070] Table 1 Related properties of antibacterial fabrics prepared in Examples 1-3 and Comparative Examples 1-2

[0071]

[0072] As shown in Table 1, within a certain range (Examples 1, 2, and 3), as the kaolin particle size increases, (1) the softness of the fabric decreases, but the deviation is not large compared to the softness of the untreated fabric, and the softness of the fabric can basically be maintained without affecting its comfort; (2) the initial antibacterial rate tends to decrease, but the overall effect is good. This may be because as the particle size changes, the specific surface area, dispersion uniformity of kaolin, and the cross-linking reaction of various substances in the finishing liquid all change, thereby affecting the performance of the finishing liquid and, in turn, the performance of the fabric; (3) the oxidation antibacterial rate, light antibacterial rate, and whiteness grade are all well maintained; at the same time, the antibacterial rate after light or oxidation remains basically unchanged, indicating that the antibacterial, antioxidant, and UV resistance of the fabric of the present invention are all good. In addition, the antibacterial rate after washing the fabric 15 times (washing 15 times) does not decrease significantly, indicating that the contact between the kaolin particles and the fabric is relatively firm. At the same time, it can be seen from the whiteness grade that its antioxidant properties can still be well maintained after washing 15 times.

[0073] When the kaolin particle size is too large (Comparative Example 2), the fabric's various properties are poor. This is mainly because, first, the kaolin's specific surface area decreases when the particle size is large, and the amount of antimicrobial agents, anti-UV agents, and antioxidants adsorbed is small, resulting in poor antimicrobial performance and color fastness. Second, larger particles have a weaker bond with the fabric surface, so the functional particles are more likely to fall off after 15 washes, affecting its performance. Third, using larger particles for functional modification coating increases the hardness of the fabric.

[0074] When the particle size of kaolin is too small (Comparative Example 1), kaolin nanoparticles are more likely to agglomerate, the functional substances adsorbed on their surface are uneven, and the distribution on the fabric is also uneven. The agglomerated particle agglomerates are also easy to fall off during washing, so the performance is poor.

[0075] Example 4 and Comparative Examples 3-4

[0076] A finishing method for antibacterial fabric with high color stability is provided. Compared with Example 1, the difference is that in step S1, the proportion of silver ions to the total mass of the antibacterial composite particles is different. The other steps are substantially the same as Example 1 and will not be repeated here.

[0077] The high color stability antibacterial fabrics obtained in Example 4 and Comparative Examples 3-4 were subjected to performance tests. The results are shown in Table 2:

[0078] Table 2 Related properties of antibacterial fabrics prepared in Example 4 and Comparative Examples 3-4

[0079]

[0080]

[0081] As shown in Table 2, when the content of antioxidant and anti-ultraviolet agent remains unchanged, as the silver ion content continues to increase, the initial antibacterial rate shows an increasing trend, and when it reaches a certain value, it is basically stable. However, when the silver ion content is too high (Comparative Example 4), although the initial antibacterial rate is higher, the silver ion content is too high at this time, and its content does not match the content of antioxidant and anti-ultraviolet agent, resulting in the antioxidant and anti-ultraviolet agent being unable to play a good protective effect on silver ions, so its light resistance and oxidation color fastness are poor.

[0082] When the silver ion content is too low (Comparative Example 3), the antibacterial performance of the obtained antibacterial fiber is poor overall.

[0083] Examples 5-6 and Comparative Examples 5-6

[0084] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference lies in that in step S1, the proportion of butylated hydroxyanisole to the total mass of the antibacterial composite particles is different. Other steps are substantially the same as Example 1 and will not be repeated here.

[0085] The high color stability antibacterial fabrics obtained in Examples 5-6 and Comparative Examples 5-6 were subjected to performance tests. The results are shown in Table 3:

[0086] Table 3 Related properties of antibacterial fabrics prepared in Examples 5-6 and Comparative Examples 5-6 It can be seen from Table 3 that when the content of silver ions and anti-ultraviolet agent remains unchanged, as the content of antioxidant continues to increase (Examples 1, 5, and 6), the initial antibacterial effect first increases and then tends to be stable, indicating that there is a certain synergistic effect between silver ions and antioxidants; at the same time, the oxidation resistance and ultraviolet resistance of the fabric are all enhanced, indicating that there is a certain synergistic effect between silver ions, antioxidants and anti-ultraviolet agents.

[0087] When the antioxidant content reaches a certain value, and then further increases the antioxidant content (Comparative Example 5), the antibacterial rate of the fabric after oxidation is basically unchanged from the initial antibacterial rate, that is, the antioxidant performance is basically at a constant value, while increasing the cost.

[0088] When the antioxidant content is low (Comparative Example 6), the antioxidant performance is weak, the oxidation antibacterial rate of the obtained fabric decreases significantly, and the fiber is prone to discoloration in a short time.

[0089] Examples 7-8 and Comparative Examples 7-8

[0090] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that in step S1, the proportion of the benzophenone compound in the total mass of the antibacterial composite particles is different. Other steps are substantially the same as Example 1 and will not be repeated here.

[0091] The high color stability antibacterial fabrics obtained in Examples 7-8 and Comparative Examples 7-8 were subjected to performance tests. The results are shown in Table 4:

[0092] Table 4 Related properties of antibacterial fabrics prepared in Examples 7-8 and Comparative Examples 7-8

[0093]

[0094] It can be seen from Table 4 that, when the content of silver ions and antioxidants remains unchanged, with the continuous increase of the content of anti-ultraviolet agent (Examples 1, 7, and 8), the light antibacterial rate continues to increase, and the UV resistance of the fabric is also enhanced; at the same time, the initial antibacterial rate and oxidative antibacterial rate of the fabric first increase and then tend to stabilize, further illustrating that there is a certain synergistic effect between silver ions, antioxidants and anti-ultraviolet agents.

[0095] When the content of the anti-ultraviolet agent reaches a certain value and is further increased (Comparative Example 8), the antibacterial rate of the fabric after illumination is basically unchanged from the initial antibacterial rate, that is, the anti-ultraviolet performance is basically at a constant value, while the cost is also increased.

[0096] When the content of the anti-ultraviolet agent is low (Comparative Example 7), the anti-ultraviolet performance is weak, the light fastness is only level 2, and various antibacterial rates are also reduced.

[0097] Example 9 and Comparative Examples 9-10

[0098] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that the content (by weight) of acrylic acid in the silver-based antibacterial finishing liquid in step S2 is different. Other details are substantially the same as Example 1 and will not be repeated here.

[0099] The high color stability antibacterial fabrics obtained in Example 9 and Comparative Examples 9-10 were subjected to performance tests. The results are shown in Table 5:

[0100] Table 5 Related properties of antibacterial fabrics prepared in Examples 9-10 and Comparative Examples 9-10

[0101]

[0102] As shown in Table 5, within a certain range, as the acrylic acid content continues to increase (Examples 1 and 9), (1) the softness of the finished fabric is weakened, but it does not affect the overall comfort; (2) the initial antibacterial rate is relatively stable, and the oxidation antibacterial rate and the light antibacterial rate vary. This may be because as the acrylic acid content changes, the reaction rate of the chemical reaction between acrylic acid and kaolin, fabric, modified starch and butyl acrylate changes slightly, which in turn affects the performance of the fabric, but the overall effect is good; (3) the antibacterial rate after washing 15 times is significantly improved. This may be because as the acrylic acid content continues to increase, a uniform and stable polymer film is formed on the surface of kaolin, which makes the bond between kaolin and fabric stronger.

[0103] As the acrylic acid content increases further (Comparative Example 10), the fabric's softness decreases significantly, and various properties weaken. This may be because the excessive acrylic acid content leads to overly vigorous reactions, uneven thickness of the polymer film on the kaolin surface, and the polymer film tightly encapsulates functional substances such as silver ions, preventing uniform release, resulting in poor performance. This suggests that there is a certain degree of synergy between the various substances in the finishing solution, and the appropriate ratio of these substances is required to achieve a fabric with a unique structure, and ultimately, a high-performance fabric.

[0104] When the acrylic acid content is low (Comparative Example 9), although the fabric is softer, the low acrylic acid content causes the polymer film on the kaolin surface to be thinner and uneven, and the bonding force between kaolin and fabric is weak, resulting in poor performance.

[0105] Examples 10-11 and Comparative Examples 11-12

[0106] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that the content (by weight) of butyl acrylate in the silver-based antibacterial finishing liquid in step S2 is different. Other details are substantially the same as those in Example 1 and are not described again here.

[0107] The high color stability antibacterial fabrics obtained in Examples 10-11 and Comparative Examples 11-12 were subjected to performance tests. The results are shown in Table 6:

[0108] Table 6 Related properties of antibacterial fabrics prepared in Examples 10-11 and Comparative Examples 11-12

[0109]

[0110]

[0111] As shown in Table 6, within a certain range, as the content of butyl acrylate continues to increase (Examples 1, 10, and 11), (1) the softness of the finished fabric continues to increase, indicating that butyl acrylate can reduce the regularity inside the polymer, thereby improving the softness of the fabric; (2) the initial antibacterial rate, oxidative antibacterial rate, and light antibacterial rate show a trend of first increasing and then decreasing. This may be because as the content of butyl acrylate changes, the polymer formed by acrylic acid and butyl acrylate changes in the wrapping of the kaolin surface and the adhesion between the polymer and the fabric, thereby changing the structure of the fabric and thus the performance, but the overall effect is better; (3) the antibacterial rate after washing 15 times shows an increasing trend. This may be because as the content of butyl acrylate continues to increase, although the polymer formed by acrylic acid and butyl acrylate changes in the wrapping of the kaolin surface and the adhesion between the polymer and the fabric, the overall adhesion is stronger.

[0112] As the butyl acrylate content further increased (Comparative Example 12), the softness of the fabric remained essentially stable, but various properties such as antibacterial properties weakened. This may be because excessive butyl acrylate disrupted the equilibrium state of the chemical reaction between acrylic acid and kaolin, fabric, modified starch, and butyl acrylate. This further demonstrates that there is a certain synergistic effect between the various substances in the finishing liquid, and that an appropriate ratio of the various substances is required to obtain a fabric with a special structure, and thus a high-performance fabric.

[0113] When the acrylic acid content is low (Comparative Example 11), various properties of the fabric are weakened.

[0114] Examples 12-13 and Comparative Examples 13-14

[0115] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that the content (by weight) of ammonium persulfate in the silver-based antibacterial finishing liquid in step S2 is different. Other details are substantially the same as Example 1 and are not described again here.

[0116] The high color stability antibacterial fabrics obtained in Examples 12-13 and Comparative Examples 13-14 were subjected to performance tests. The results are shown in Table 7:

[0117] Table 7 Related properties of antibacterial fabrics prepared in Examples 12-13 and Comparative Examples 13-14

[0118]

[0119]

[0120] As shown in Table 7, within a certain range, as the content of ammonium persulfate continues to increase (Examples 1, 12, and 13), (1) the softness of the finished fabric remains basically unchanged; (2) the initial antibacterial rate, oxidative antibacterial rate, and light antibacterial rate all change, but the overall antibacterial property is good. This indicates that while ammonium persulfate triggers the polymerization reaction of acrylic acid and butyl acrylate, it also affects the reaction of acrylic acid with other substances, further indicating that there is a certain synergistic effect between the substances in the finishing liquid; (3) the antibacterial rate after washing 15 times shows an increasing trend. This may be because as the content of ammonium persulfate continues to increase, the polymer formed by acrylic acid and butyl acrylate is more firmly wrapped on the surface of kaolin, and at the same time, the adhesion between kaolin and fabric is stronger, and thus the performance after washing 15 times is better.

[0121] As the ammonium persulfate content increased further (Comparative Example 14), various fabric properties weakened. This is primarily because excessive ammonium sulfate content leads to excessive amounts of small molecule active free radicals, resulting in chaotic polymerization of acrylic acid and butyl acrylate. Furthermore, these excessive small molecule free radicals disrupt the polymerization reaction, resulting in a low molecular weight polymer and irregular molecular chains. This not only impairs the performance of the polymer film on the kaolin surface but also weakens the bonding between the kaolin and the fabric, further impacting various properties. Furthermore, excessive ammonium sulfate content severely damages butyl acrylate, affecting the softness of the fabric.

[0122] When the content of ammonium persulfate is low (Comparative Example 13), the polymerization reaction is insufficient, thereby affecting various properties.

[0123] Examples 14-17 and Comparative Examples 15-18

[0124] A finishing method for antibacterial fabrics with high color stability is disclosed. Compared with Example 1, the difference lies in that the contents (by weight) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl) and N-hydroxysuccinimide in the silver-based antibacterial finishing solution in step S2 are different. Otherwise, the method is substantially the same as Example 1 and is not further described here.

[0125] The high color stability antibacterial fabrics obtained in Examples 14-17 and Comparative Examples 15-18 were subjected to performance tests. The results are shown in Table 8:

[0126] Table 8 Related properties of antibacterial fabrics prepared in Examples 14-17 and Comparative Examples 15-18

[0127]

[0128] As can be seen from Table 8, within a certain range, as the content of EDC·HCl and N-hydroxysuccinimide continues to change (Examples 1, 14, 15, 16, and 17), the various properties of the finished fabric are basically stable. This may be because when the content of EDC·HCl and N-hydroxysuccinimide changes within a certain range, the promoting effect on the esterification reaction of acrylic acid with kaolin, fabric, and modified starch is not significant, thereby allowing an appropriate amount of kaolin to adhere to the fabric surface. At the same time, with the help of the modified starch, the softness is basically maintained.

[0129] As the content of EDC·HCl and N-hydroxysuccinimide further increased (Comparative Example 16), the softness of the fabric was significantly weakened. This was mainly because the increase in the content of the two resulted in excessive cross-linking points in the esterification reaction, causing the esterification reaction to be disorderly, making the structure after bonding between the components uneven and unstable, thereby affecting its softness. At the same time, it also affected the bonding between the fabric and kaolin and the polymer film structure on the kaolin surface, thereby affecting various properties.

[0130] When the contents of EDC·HCl and N-hydroxysuccinimide are low (Comparative Example 15), the esterification reaction between acrylic acid and kaolin, fabric and modified starch is not sufficient, thereby affecting the structure and properties of the fabric.

[0131] When only one of EDC·HCl and N-hydroxysuccinimide was used (Comparative Examples 16 and 17), the performance of the fabric decreased significantly, indicating a synergistic effect between the two.

[0132] Example 18 and Comparative Examples 19-20

[0133] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that the content (by weight) of modified starch in the silver-based antibacterial finishing liquid in step S2 is different. Other details are substantially the same as Example 1 and are not described again here.

[0134] The high color stability antibacterial fabrics obtained in Example 18 and Comparative Examples 19-20 were subjected to performance tests. The results are shown in Table 9:

[0135] Table 9 Related properties of antibacterial fabrics prepared in Example 18 and Comparative Examples 19-20

[0136]

[0137] As shown in Table 9, within a certain range, as the content of modified starch continues to change (Examples 1 and 18), the softness of the finished fabric is improved, and various antibacterial properties are also improved. This may be because, on the one hand, the presence of modified starch can reduce the interaction between acrylic acid polymers, further improving the softness of the fabric; on the other hand, the reaction between acrylic acid and modified starch is more sufficient, resulting in a better structure and better performance of the obtained fabric.

[0138] As the content of modified starch further increases (Comparative Example 20), the cross-linking stability of the esterification reaction is reduced, thereby affecting various properties of the fabric.

[0139] When the modified starch content is low (Comparative Example 15), the softness of the fabric decreases, and the antibacterial properties also decrease. This may be because, first, when the starch content is low, the softness is poor, resulting in a weaker bonding between the kaolin and the fabric; second, when the starch content is low, various reactions are affected to varying degrees, affecting the performance.

[0140] Example 19 and Comparative Examples 21-22

[0141] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that the content (by weight) of the antibacterial composite particles in the silver-based antibacterial finishing liquid in step S2 is different. Other details are substantially the same as Example 1 and will not be repeated here.

[0142] The high color stability antibacterial fabrics obtained in Example 19 and Comparative Examples 21-22 were subjected to performance tests. The results are shown in Table 10:

[0143] Table 10 Related properties of antibacterial fabrics prepared in Example 19 and Comparative Examples 21-22

[0144]

[0145] It can be seen from Table 10 that within a certain range, as the content of the antibacterial composite particles continues to change (Examples 1 and 19), the softness of the finished fabric decreases, and the other properties are basically stable.

[0146] As the content of antimicrobial composite particles increases (Comparative Example 22), more antimicrobial particles adhere to the fabric surface, affecting the fabric's softness. Furthermore, when the content of antimicrobial composite particles is too high, the polymer film structure on each antimicrobial particle surface becomes uneven, weakening the adhesion to the fabric and further affecting performance. Antimicrobial properties are also weakened, possibly due to the uneven arrangement of kaolin on the fabric surface, which affects the release of functional substances such as silver ions.

[0147] When the content of the antibacterial composite particles is low (Comparative Example 21), the antibacterial properties and other performances are significantly poorer.

[0148] Examples 20-21 and Comparative Examples 23-24

[0149] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference lies in that, in step S3, the liquid carrying rate after rolling is different. The other steps are substantially the same as Example 1 and will not be described in detail here.

[0150] The high color stability antibacterial fabrics obtained in Examples 20-21 and Comparative Examples 23-24 were subjected to performance tests. The results are shown in Table 11:

[0151] Table 11 Related properties of antibacterial fabrics prepared in Examples 20-21 and Comparative Examples 23-24

[0152]

[0153] It can be seen from Table 11 that within a certain range, as the liquid-carrying rate content continues to change (Examples 1, 20, and 21), (1) the softness of the finished fabric tends to weaken. This may be because, as the liquid-carrying rate increases, the film structure formed on the fabric surface becomes thicker, which in turn affects the softness; (2) the initial antibacterial rate, oxidation antibacterial rate, and light antibacterial rate first increase and then basically stabilize; (3) the antibacterial rate after washing 15 times first increases and then decreases. This may be because as the thickness of the film structure formed on the fabric surface increases, its bonding force with the fabric is weakened.

[0154] When the liquid pick-up rate was too high (Comparative Example 23), the softness was significantly reduced, and the antibacterial properties were also weakened. This may be because when the liquid pick-up rate is too high, the film thickness on the fabric surface is too thick, reducing the softness; at the same time, the chemical reactions of the various substances are more intense, thus affecting the regularity of the fabric surface structure.

[0155] When the liquid pick-up rate is too low (Comparative Example 30), the antibacterial property of the fabric is poor.

[0156] Example 22 and Comparative Examples 25-26

[0157] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference lies in that the baking temperature in step S3 is different. The other steps are substantially the same as Example 1 and will not be described in detail here.

[0158] The high color stability antibacterial fabrics obtained in Example 22 and Comparative Examples 25-26 were subjected to performance tests. The results are shown in Table 12:

[0159] Table 12 Related properties of antibacterial fabrics prepared in Example 22 and Comparative Examples 25-26

[0160]

[0161] It can be seen from Table 12 that within a certain range, as the temperature increases (Examples 1 and 22), the initial antibacterial rate, oxidation antibacterial rate and light antibacterial rate of the fabric tend to be stable, and the antibacterial rate after washing 15 times is significantly improved. This may be because the increase in temperature makes the binding force between kaolin and fabric stronger.

[0162] When the temperature is high (Comparative Example 26), not only will various properties not be improved, but more energy will be consumed. Even with high temperature, the structure of various substances will be damaged, thereby affecting the performance.

[0163] When the temperature is low (Comparative Example 25), various reactions are not fully carried out, thereby affecting its performance.

[0164] Comparative Example 27

[0165] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that in step S2, a polymer formed by acrylic acid and butyl acrylate is directly added. The rest is substantially the same as Example 1 and will not be repeated here.

[0166] Comparative Example 28

[0167] A finishing method for antibacterial fabrics with high color stability is provided. Compared with Example 1, the difference is that in step S2, acrylic acid and butyl acrylate are not added, and butyl acrylate and acrylic acid amide copolymer emulsion are directly added. The other steps are substantially the same as those in Example 1 and are not described herein.

[0168] Comparative Example 29

[0169] A finishing method for antibacterial fabrics with high color stability is disclosed. Compared with Example 1, the difference is that the silver-based antibacterial finishing liquid in step S2 does not contain 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide; the other steps are substantially the same as those in Example 1 and are not further described here.

[0170] The high color stability antibacterial fabrics obtained in Comparative Examples 27-29 were subjected to performance tests. The results are shown in Table 13:

[0171] Table 13 Related properties of antibacterial fabrics prepared in Examples 27-29

[0172]

[0173] As can be seen from Table 13, when the polymer formed by acrylic acid and butyl acrylate is directly added (Comparative Example 27) or the copolymer emulsion of butyl acrylate and acrylic acid amide is directly added (Comparative Example 28), various properties of the finished fabric are affected. This is mainly because when the polymer is directly added, the polymer molecular chain is larger and the steric hindrance between the molecules is greater, which makes the content of the complex molecules adhering to the kaolin surface small and uneven, thereby affecting the amount and uniformity of the kaolin adhered to the fabric surface. In addition, when the high molecular weight polymer is directly added, the bonding reaction between acrylic acid, butyl acrylate, modified starch, and kaolin does not occur during the process, resulting in different adhesion structures of the various substances in the finishing solution on the fabric surface and poor adhesion, which in turn affects various properties.

[0174] When 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide are not added to the silver-based antibacterial finishing liquid (Comparative Example 29), the performance of the resulting fabric will also decline, further illustrating the promoting effect of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide on the esterification reaction, which will affect the reaction of the entire system and thus affect its performance.

[0175] In summary, the present invention provides a post-finishing method for antibacterial fabrics with high color stability. First, an antibacterial agent, an antioxidant, and an anti-ultraviolet agent are attached to the surface and internal pores of kaolin; then a silver-based antibacterial post-finishing liquid is prepared; and finally, the fabric to be finished is placed in the silver-based antibacterial post-finishing liquid for padding. In the subsequent post-finishing process, esterification reactions occur between acrylic acid and kaolin, acrylic acid and the fabric to be finished, and acrylic acid and modified starch. Simultaneously, polymerization of acrylic acid and butyl acrylate occurs, so that a copolymer of acrylic acid and butyl acrylate becomes a linking polymer between the fabric, kaolin nanoparticles, and starch, and the mixed system after the polymerization forms a stable film on the surface of the fabric. The functionality obtained by the post-finishing of the fabric has long-term stability. The obtained antibacterial fabric can prevent the silver-based antibacterial agent from discoloring under light and oxidation conditions, and is particularly suitable for cotton and linen fabrics composed of cellulose basic units.

[0176] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A finishing method for antibacterial fabrics with high color stability, characterized in that: The steps include: S1. Calcined kaolin is used as a carrier to adsorb silver ions, antioxidants and anti-ultraviolet agents to obtain antibacterial composite particles; the antibacterial composite particles contain silver ions, antioxidants and anti-ultraviolet agents in an amount of 35-40%, 5-10% and 3-5% of the total mass of the antibacterial composite particles, respectively; the particle size of the kaolin is 100-1000 nm; S2. Prepare an aqueous finishing agent containing 10-15 parts by weight of the antibacterial composite particles, 25-30 parts by weight of acrylic acid, 15-25 parts by weight of butyl acrylate, 8-15 parts by weight of modified starch, 5-10 parts by weight of sodium lauryl sulfate, 3-5 parts by weight of dodecylphenol polyoxyethylene ether, 1-3 parts by weight of ammonium persulfate, 3-5 parts by weight of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 3-5 parts by weight of N-hydroxysuccinimide to obtain a silver-based antibacterial finishing solution; S3. The fabric to be treated is first padded with the silver-based antibacterial finishing solution obtained in step S2, and then dried and baked to obtain an antibacterial fabric with high color stability; the liquid carrying rate of the fabric to be treated after padded is 50%-200%.

2. The finishing method of antibacterial fabric with high color stability according to claim 1, characterized in that: In step S3, the drying temperature is 60-70°C, and the baking temperature is 110-120°C.

3. The finishing method of antibacterial fabric with high color stability according to claim 1, characterized in that: In step S1, kaolin is used as a carrier to adsorb silver ions, antioxidants and anti-ultraviolet agents. Specifically, the kaolin is first placed in a saturated concentration of silver nitrate solution and soaked for 30-50 minutes to adsorb silver ions; then the kaolin adsorbed with silver ions is placed in a saturated concentration of antioxidant and anti-ultraviolet mixed solution and soaked for 30-50 minutes to adsorb antioxidants and anti-ultraviolet agents.

4. The finishing method of antibacterial fabric with high color stability according to claim 1, characterized in that: In step S2, the preparation method of the silver-based antibacterial finishing liquid is specifically as follows: 25-30 parts by weight of acrylic acid, 15-25 parts by weight of butyl acrylate, 8-15 parts by weight of modified starch, 5-10 parts by weight of sodium lauryl sulfate, 3-5 parts by weight of dodecylphenol polyoxyethylene ether, 1-3 parts by weight of ammonium persulfate, 3-5 parts by weight of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and 3-5 parts by weight of N-hydroxysuccinimide are fully stirred and dissolved in water, and then 10-15 parts by weight of antibacterial composite particles are added; in the silver-based antibacterial finishing liquid, the total concentration of antibacterial composite particles, acrylic acid, butyl acrylate, modified starch, sodium lauryl sulfate, dodecylphenol polyoxyethylene ether, ammonium persulfate, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and N-hydroxysuccinimide is 15-20 g / L.

5. The finishing method of antibacterial fabric with high color stability according to claim 1, characterized in that: In step S1, the antioxidant is one of butylated hydroxyanisole, butylated hydroxytoluene, propyl gallate or tert-butylhydroquinone.

6. The finishing method of antibacterial fabric with high color stability according to claim 1, characterized in that: In step S1, the anti-ultraviolet agent is a benzophenone or benzotriazole compound.

7. The finishing method of antibacterial fabric with high color stability according to claim 1, characterized in that: In step S3, the fabric to be finished is cotton or linen fabric.

8. The finishing method of antibacterial fabric with high color stability according to claim 1, characterized in that: In step S3, the obtained antibacterial fabric with high color stability has a softness of 4.2-5.6 mm, an initial antibacterial rate of 95.6%-100%, a light antibacterial rate of 94.2%-100%, an oxidation antibacterial rate of up to 93.8%-100%, and an antibacterial rate of up to 89.7%-96.9% after washing 15 times; when the initial whiteness level is 4, the oxidation whiteness level and the light whiteness level are as high as 4.

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