Antibacterial discoloring finishing agent and preparation method thereof
By combining MXene, chitosan and organic thermochromic materials, antibacterial discoloration microcapsules are prepared and mixed with PVA adhesive, the problem of insufficient antibacterial and discoloration performance of clothing is solved, and the effect of efficient antibacterial and intelligent temperature monitoring is achieved. .
Patent Information
- Application Number
- CN202411708416.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-02-18
AI Technical Summary
Existing clothing has shortcomings in antibacterial and discoloration performance, and cannot effectively prevent microbial growth and achieve intelligent temperature monitoring.
Antibacterial color discoloration microcapsules were prepared by chemical etching and emulsification polymerization processes using MXene two-dimensional nanomaterial combined with chitosan and organic thermochromic materials, and mixed with PVA adhesive to form an antibacterial color discoloration finishing agent.
It realizes the significant antibacterial performance and intelligent color discoloration function of clothing, can effectively inhibit the growth of common bacteria, and realizes intuitive visual monitoring when temperature changes, and has good washing and durability.
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of functional clothing, and in particular to an antibacterial color-changing finishing agent and a preparation method thereof. Background Art
[0002] As a close-fitting garment, knitwear is highly valued by consumers for its comfort and practical functions. Although traditional knitted materials perform well in basic properties such as warmth retention and moisture absorption, their lack of antibacterial properties has become particularly prominent as society pays increasing attention to environmental health. The growth of microorganisms on textiles not only damages the appearance and structure of the fabric and accelerates the fading process, but may also trigger allergic reactions in the human body, posing a potential threat to the health of the wearer. In view of this, it is particularly important to treat knitted fabrics with antibacterial treatment. In addition, if smart color-changing technology can be integrated into knitted fabrics, it can not only add fun and personalized elements to daily wear, but also make clothing an intelligent perception and visual expression tool for environmental conditions, realizing creative applications of environmental monitoring. This innovative combination not only meets consumers' dual pursuit of beauty and functionality in clothing, but also conforms to the trend of modern technology being integrated into daily life. MXene, i.e., two-dimensional transition metal carbides or nitrides, is becoming a hot topic in scientific research due to its unique physical and chemical properties, such as extremely high aspect ratio, ultra-thin thickness at the atomic level, excellent photothermal conversion ability, extremely low cytotoxicity, and excellent dispersibility in aqueous solution. Moreover, these materials also have flexible functionalization potential. By loading antimicrobial agents or constructing composite structures of various dimensions, such as zero-dimensional (0D) / two-dimensional (2D), one-dimensional (1D) / two-dimensional (2D), etc., they can achieve light-induced drug properties, further broadening their application prospects in biomedicine, environmental governance and other fields.
[0003] The present invention precisely meets the market demand and has successfully developed a method for preparing antibacterial color-changing functional sports knitted clothing by innovatively integrating the excellent high surface area adsorption capacity of MXene, the strong antibacterial ability of chitosan (CS), and the unique color-changing function of organic thermochromic materials. This preparation method not only gives the knitted fabric powerful antibacterial protection, but also gives it the novel characteristic of intelligent color change, bringing a double experience to the wearer. It is particularly worth mentioning that this method is simple and fast, environmentally friendly and pollution-free throughout the process, perfectly meets the current needs of green production, and has great potential for large-scale production. Looking to the future, this antibacterial color-changing functional sports knitted clothing is expected to stand out in the smart clothing market and occupy an important position. Summary of the invention
[0004] The purpose of the present application is to provide an antibacterial color-changing finishing agent and a preparation method thereof, so as to solve the technical problem of limited antibacterial and color-changing properties of clothing in the prior art.
[0005] The present invention provides an antibacterial color-changing finishing agent and a preparation method thereof. Step 1: adding LiF powder to a hydrochloric acid solution and stirring to prepare an etchant, then slowly mixing Ti3AlC2 powder with the etchant, after the reaction, washing the product, centrifugally washing with deionized water until the solution becomes neutral, removing the residual etchant and impurities, and obtaining a multilayer Ti3C2T x MXene; Step 2: The multilayer Ti3C2T x MXene was re-ultrasonic dispersed, washed with deionized water for multiple times, centrifuged, and dried to obtain MXene powder; Step 3, dissolving chitosan in an acetic acid solution at room temperature, then adding crystal violet lactone, bisphenol A, and n-hexadecanol, stirring and ultrasonicating to obtain a mixed solution, then, adding glutaraldehyde as a cross-linking agent dropwise in a water bath to obtain chitosan-crystal violet lactone-bisphenol A-n-hexadecanol sol, finally, centrifuging the obtained chitosan-crystal violet lactone-bisphenol A-n-hexadecanol sol, washing the solid precipitate three times with deionized water, treating and drying in a vacuum freeze drying oven to constant weight, and obtaining a color-changing antibacterial microcapsule with chitosan as a shell and crystal violet lactone, bisphenol A and n-hexadecanol as a core; Step 4: Disperse the MXene powder obtained in step 2 in deionized water, and add glacial acetic acid to obtain a MXene dispersion, then add the color-changing antibacterial microcapsules to the MXene dispersion, stir evenly, add cross-linking agents N,N'-methylenebisacrylamide and N,N'-bis(acryloyl)cystamine, and then magnetically stir the MXene-color-changing antibacterial microcapsule mixed system to react to prepare an antibacterial color-changing functionalized MXene material; Step 5: Mix the antibacterial color-changing functionalized MXene material with the PVA adhesive to prepare an antibacterial color-changing finishing agent for sports knitted clothing.
[0006] Preferably, in step one, the etchant is prepared by adding 3-6 g LiF powder into a beaker containing 60-80 mL hydrochloric acid, the reaction temperature is controlled at 35-45° C., and the reaction time is 30-48 h; Ti3AlC2 powder is used as a MXene precursor raw material with a purity of ≥98%.
[0007] Preferably, in step three, the centrifugal speed of chitosan-crystal violet lactone-bisphenol A-n-hexadecanol sol is 7000-10000 r / min; crystal violet lactone, bisphenol A, and n-hexadecanol are used as color-changing materials, and the color-changing temperature is 38°C.
[0008] Preferably, in step four, the mass percentage of MXene powder dispersed in the glacial acetic acid solution is 1-3wt%; the mass ratio of MXene powder to color-changing antibacterial microcapsules is 6-8:3-4, the stirring reaction time of MXene powder and color-changing antibacterial microcapsules is 20-30h, and the content of cross-linking agent is 0.1-0.3% of the total mass of the MXene-color-changing antibacterial microcapsule mixed system; the mass ratio of antibacterial color-changing functionalized MXene material to PVA adhesive is 9-7:3-1.
[0009] Preferably, in step five, the molecular weight of PVA is 10,000-20,000.
[0010] Preferably, in step 1, Ti3AlC2 powder is added to a LiF solution containing hydrochloric acid, and the liquid-to-solid ratio is controlled at 25-20 mL:5-1 g.
[0011] Preferably, the drying step in step 2 is: the purified MXene suspension is placed in a forced air drying oven at 60-80° C. and dried for 24-36 hours.
[0012] The present invention provides an antibacterial color-changing finishing agent obtained according to the preparation method of the antibacterial color-changing finishing agent.
[0013] Preferably, the finishing agent is applied to the surface of the knitted fabric by an impregnation method to obtain antibacterial color-changing functional sports knitted clothing, and the process is as follows: when the sports knitted clothing is dipped in the antibacterial color-changing finishing agent solution, the amount of the antibacterial color-changing finishing agent is 3-5% of the weight of the clothing, the bath ratio of the finishing liquid is 1:10-15, the temperature is 10-30°C, three dips and three rolls, the liquid rolling rate is 70-80%, the time is 20-30min, and then dehydrated in a centrifugal dehydrator, dried in a dryer, the drying temperature is 80-100°C, and the time is 25-35min.
[0014] Therefore, the present application provides an antibacterial color-changing finishing agent and a preparation method thereof, which have the following beneficial effects: 1) The present invention innovatively uses highly antibacterial MXene two-dimensional nanomaterials as the core component of the finishing agent. This material, with its inherent antibacterial properties, surpasses the role of traditional carriers and directly gives the finished material significant antibacterial ability. At the same time, the present invention also incorporates ternary thermochromic components (including crystal violet lactone, bisphenol A and n-hexadecane), which are white below 38°C and red above 38°C, which not only adds fun and interactivity to clothing, but also realizes intuitive visual monitoring of temperature changes. In addition, the introduction of chitosan as a microcapsule shell material and antibacterial component, with its excellent antibacterial activity, effectively curbs the growth of common bacteria such as Escherichia coli and Staphylococcus aureus on the surface of knitted fabrics, thereby improving the hygiene standards of knitted fabrics, helping to prevent skin problems caused by bacteria, and ensuring the health and safety of the wearer. The application of polyvinyl alcohol (PVA) adhesive ensures a stable combination between the finishing agent and the fiber material, so that the antibacterial and discoloration properties can be retained on the knitted fabric for a long time, and it is not easy to fall off even after multiple washings, ensuring the durability and functionality of the product. The color-changing antibacterial functional sports knitted clothing prepared by the invention was tested and found that the clothing was white at a temperature of 35°C or below, and red at a temperature of 36°C or above; after washing the clothing 50 times, the clothing was still white at a temperature of 35°C or below, and red at a temperature of 36°C or above, and it had good color-changing performance. The antibacterial rates of the clothing against Staphylococcus aureus, Escherichia coli and Candida albicans reached 99.0-99.8%, 98.0-98.6% and 96.0-96.4% respectively; after washing 50 times, the antibacterial rates of the clothing against Staphylococcus aureus, Escherichia coli and Candida albicans reached 95.0-95.6%, 94.0-94.8% and 90.0-90.2% respectively, reaching good antibacterial properties.
[0015] The preparation method of the present invention is simple and efficient, including mature processes such as chemical etching to prepare MXene, emulsion polymerization to prepare microcapsules, and mechanical stirring compounding. These technologies can be directly applied to the finishing process of knitted fabrics, facilitating industrial large-scale production. More importantly, all components such as MXene, chitosan, PVA, etc. are non-toxic and harmless, meet environmental protection requirements, and make positive contributions to promoting the production of green textiles and meeting consumers' demand for healthy and comfortable textiles. DETAILED DESCRIPTION
[0016] The technical solution of the present invention is further illustrated by the following examples.
[0017] Example 1 A method for preparing antibacterial color-changing functional sports knitted clothing comprises the following steps: S1, select Ti3AlC2 powder as MXene precursor raw material. Prepare crystal violet lactone (CVL), bisphenol A and hexadecanol ternary component materials as microcapsule core materials, and the color change temperature is 38°C. Prepare chitosan antibacterial material as microcapsule shell material, which has excellent antibacterial activity. Prepare polyvinyl alcohol (PVA) as adhesive, which has good water solubility and strong affinity with fiber.
[0018] S2, add 3g LiF powder into a Teflon beaker containing 60mL hydrochloric acid and stir to prepare an etchant. Then, slowly mix Ti3AlC2 with the etchant and react at 35°C for 35h. Wash the product. Centrifuge with deionized water at a speed of 3000r / min and a centrifugal time of 5min until the solution becomes neutral, remove the residual etchant and impurities, and obtain a multilayer Ti3C2T x MXene.
[0019] S3, the multilayer Ti3C2T obtained in step S2 x MXene was re-ultrasonicated and dispersed, washed with deionized water for multiple times, centrifuged and dried to obtain MXene powder. The ultrasonic power was 200 W and the time was 30 min.
[0020] S4, with crystal violet lactone, bisphenol A, hexadecanol as core material, chitosan as wall material, and composite microcapsules prepared by crosslinking method. 0.9g chitosan was dissolved in 30mL 3% acetic acid solution at room temperature, and then 0.1g crystal violet lactone, bisphenol A, and hexadecanol were added respectively, stirred and ultrasonicated for 30min to obtain a mixed solution. Then, 1% glutaraldehyde was added dropwise as a crosslinking agent in a 60°C water bath environment to obtain chitosan-crystal violet lactone-bisphenol A-hexadecanol sol. Finally, the sol was centrifuged at a speed of 7000r / min, the solid precipitate was washed three times with deionized water, and dried to constant weight in a vacuum freeze drying oven to obtain color-changing antibacterial microcapsules with chitosan as the shell and crystal violet lactone, bisphenol A and hexadecanol as the core.
[0021] S5, dissolve 1g of the MXene powder obtained in step S3 in a total volume of 100mL of 1% glacial acetic acid solution. Add 0.5g of the color-changing antibacterial microcapsules obtained in step S4, stir evenly, and add 0.1g of cross-linking agents N,N'-methylenebisacrylamide and N,N'-bis(acryloyl)cystamine. Then, magnetically stir the MXene-chitosan color-changing antibacterial microcapsule mixed solution for 24h to prepare an antibacterial color-changing functionalized MXene material.
[0022] S6, mixing the antibacterial color-changing functionalized MXene material with the PVA adhesive, wherein the mass ratio of the antibacterial color-changing functionalized MXene material to the PVA adhesive is 8:3, and an antibacterial color-changing finishing agent for sports knitted clothing is prepared.
[0023] The antibacterial color-changing finishing agent prepared by the above preparation method is used to finish sports knitted clothing to obtain antibacterial color-changing functional sports knitted clothing. The finishing process is as follows: When the sports knitted garments are dipped in the antibacterial discoloration finishing agent solution, the dosage of the antibacterial discoloration finishing agent is 3% of the weight of the garment, the bath ratio of the finishing solution is 1:10, the temperature is 10°C, three dips and three rolls, the rolling rate is 70%, and the time is 20 minutes. Then dehydrate in a centrifugal dehydrator and dry in a dryer at a drying temperature of 80°C for 25 minutes.
[0024] The color-changing antibacterial functional sports knitted clothing prepared by this invention was tested and found that the clothing was white at a temperature of 35°C or below, and red at a temperature of 36°C or above; after washing the clothing 50 times, the clothing was still white at a temperature of 35°C or below, and red at a temperature of 36°C or above, and it had good color-changing performance. The antibacterial rates of this clothing against Staphylococcus aureus, Escherichia coli and Candida albicans reached 99.0%, 98.0% and 96.0% respectively; after washing 50 times, the antibacterial rates of this clothing against Staphylococcus aureus, Escherichia coli and Candida albicans reached 95.0%, 94.0% and 90.0% respectively, reaching good antibacterial properties.
[0025] Example 2 A method for preparing antibacterial color-changing functional sports knitted clothing comprises the following steps: S1, select Ti3AlC2 powder as MXene precursor raw material. Prepare crystal violet lactone (CVL), bisphenol A and hexadecanol ternary component materials as microcapsule core materials, and the color change temperature is 38°C. Prepare chitosan antibacterial material as microcapsule shell material, which has excellent antibacterial activity. Prepare polyvinyl alcohol (PVA) as adhesive, which has good water solubility and strong affinity with fiber.
[0026] S2, add 4g LiF powder into a Teflon beaker containing 70mL hydrochloric acid and stir to prepare an etchant. Then, slowly mix Ti3AlC2 with the etchant and react at 40℃ for 40h. Wash the product. Centrifuge with deionized water at a speed of 4000r / min and a centrifugal time of 8min until the solution becomes neutral, remove the residual etchant and impurities, and obtain a multilayer Ti3C2T x MXene.
[0027] S3, the multilayer Ti3C2T obtained in step S2 x MXene was re-ultrasonic dispersed, washed with deionized water for multiple times, centrifuged and dried to obtain MXene powder. The ultrasonic power was 250 W and the time was 40 min.
[0028] S4, with crystal violet lactone, bisphenol A, hexadecanol as core material, chitosan as wall material, and composite microcapsules prepared by crosslinking method. 1g chitosan was dissolved in 45mL 3% acetic acid solution at room temperature, and 0.2g crystal violet lactone, bisphenol A, and hexadecanol were added respectively, stirred and ultrasonicated for 35min to obtain a mixed solution. Then, 2% glutaraldehyde was added dropwise as a crosslinking agent in a 65°C water bath environment to obtain a chitosan-crystal violet lactone-bisphenol A-hexadecanol sol. Finally, the sol was centrifuged at a speed of 8000r / min, the solid precipitate was washed three times with deionized water, and dried to constant weight in a vacuum freeze drying oven to obtain a color-changing antibacterial microcapsule with chitosan as the shell and crystal violet lactone, bisphenol A and hexadecanol as the core.
[0029] S5, dissolve 2g of the MXene powder obtained in step S3 in a total volume of 100mL of 2% acetic acid solution. Add 0.7g of the color-changing antibacterial microcapsules obtained in step S4, stir evenly, and add 0.2g of cross-linking agents N,N'-methylenebisacrylamide and N,N'-bis(acryloyl)cystamine. Then, magnetically stir the MXene-chitosan color-changing antibacterial microcapsule mixed solution for 25h to prepare an antibacterial color-changing functionalized MXene material.
[0030] S6, mixing the antibacterial color-changing functionalized MXene material with the PVA adhesive, wherein the mass ratio of the antibacterial color-changing functionalized MXene material to the PVA adhesive is 7:4, and an antibacterial color-changing finishing agent for sports knitted clothing is prepared.
[0031] The antibacterial color-changing finishing agent prepared by the above preparation method is used to finish sports knitted clothing to obtain antibacterial color-changing functional sports knitted clothing. The finishing process is as follows: When the sports knitted garments are dipped in the antibacterial color-changing finishing agent solution, the dosage of the antibacterial color-changing finishing agent is 4% of the weight of the garment, the bath ratio of the finishing solution is 1:12, the temperature is 15°C, three dips and three rolls, the rolling rate is 75%, and the time is 25 minutes. Then dehydrate in a centrifugal dehydrator and dry in a dryer at a drying temperature of 90°C for 30 minutes.
[0032] The color-changing antibacterial functional sports knitted clothing prepared by this invention was tested and found that the clothing was white at a temperature of 35°C or below, and red at a temperature of 36°C or above; after washing the clothing 50 times, the clothing was still white at a temperature of 35°C or below, and red at a temperature of 36°C or above, and it had good color-changing performance. The antibacterial rates of this clothing against Staphylococcus aureus, Escherichia coli and Candida albicans reached 99.4%, 98.3% and 96.2% respectively; after washing 50 times, the antibacterial rates of this clothing against Staphylococcus aureus, Escherichia coli and Candida albicans reached 95.3%, 94.4% and 90.1% respectively, reaching good antibacterial properties.
[0033] Example 3 A method for preparing antibacterial color-changing functional sports knitted clothing comprises the following steps: S1, select Ti3AlC2 powder as MXene precursor raw material. Prepare crystal violet lactone (CVL), bisphenol A and hexadecanol ternary component materials as microcapsule core materials, and the color change temperature is 38°C. Prepare chitosan antibacterial material as microcapsule shell material, which has excellent antibacterial activity. Prepare polyvinyl alcohol (PVA) as adhesive, which has good water solubility and strong affinity with fiber.
[0034] S2, add 5g LiF powder into a Teflon beaker containing 90mL hydrochloric acid and stir to prepare an etchant. Then, slowly mix Ti3AlC2 with the etchant and react at 45℃ for 45h. Wash the product and centrifuge it with deionized water at a speed of 5000r / min for 10min until the solution becomes neutral, remove the residual etchant and impurities, and obtain a multilayer Ti3C2T x MXene.
[0035] S3, the multilayer Ti3C2T obtained in step S2 x MXene was re-ultrasonic dispersed, washed with deionized water for multiple times, centrifuged and dried to obtain MXene powder. The ultrasonic power was 300 W and the time was 60 min.
[0036] S4, with crystal violet lactone, bisphenol A, hexadecanol as core material, chitosan as wall material, and composite microcapsules prepared by crosslinking method. 1.2g chitosan was dissolved in 60mL 3% acetic acid solution at room temperature. 0.3g crystal violet lactone, bisphenol A, and hexadecanol were added at room temperature, stirred and ultrasonicated for 40min to obtain a mixed solution. Then, 3% glutaraldehyde was added dropwise as a crosslinking agent in a 70°C water bath environment to obtain chitosan-crystal violet lactone-bisphenol A-hexadecanol sol. Finally, the sol was centrifuged at a speed of 10000r / min, the solid precipitate was washed three times with deionized water, and dried to constant weight in a vacuum freeze drying oven to obtain color-changing antibacterial microcapsules with chitosan as the shell and crystal violet lactone, bisphenol A and hexadecanol as the core.
[0037] S5, dissolve 3g of the MXene powder obtained in step S3 in a total volume of 100mL of 3% acetic acid solution. Add 1g of the color-changing antibacterial microcapsules obtained in step S4 and stir evenly. Add 0.g of cross-linking agents N,N'-methylenebisacrylamide and N,N'-bis(acryloyl)cystamine. Then, the MXene-chitosan color-changing antibacterial microcapsule mixed solution is magnetically stirred for 30h to prepare an antibacterial color-changing functionalized MXene material.
[0038] S6, mixing the antibacterial color-changing functionalized MXene material with the PVA adhesive, wherein the mass ratio of the antibacterial color-changing functionalized MXene material to the PVA adhesive is 9:2, and an antibacterial color-changing finishing agent for sports knitted clothing is prepared.
[0039] The antibacterial color-changing finishing agent prepared by the above preparation method is used to finish sports knitted clothing to obtain antibacterial color-changing functional sports knitted clothing. The finishing process is as follows: When the sports knitted garments are dipped in the antibacterial discoloration finishing agent solution, the dosage of the antibacterial discoloration finishing agent is 5% of the weight of the garment, the bath ratio of the finishing solution is 1:15, the temperature is 30°C, three dips and three rolls, the rolling rate is 80%, and the time is 30 minutes. Then dehydrate in a centrifugal dehydrator and dry in a dryer at a drying temperature of 100°C for 35 minutes.
[0040] The color-changing antibacterial functional sports knitted clothing prepared by this invention was tested and found that the clothing was white at a temperature of 35°C or below, and red at a temperature of 36°C or above; after washing the clothing 50 times, the clothing was still white at a temperature of 35°C or below, and red at a temperature of 36°C or above, and it had good color-changing performance. The antibacterial rates of this clothing against Staphylococcus aureus, Escherichia coli and Candida albicans reached 99.8%, 98.6% and 96.4% respectively; after washing 50 times, the antibacterial rates of this clothing against Staphylococcus aureus, Escherichia coli and Candida albicans reached 95.6%, 94.8% and 90.2% respectively, reaching good antibacterial properties.
[0041] Therefore, the present application provides an antibacterial color-changing finishing agent and a preparation method thereof, wherein Ti3AlC2 powder is dispersed in a hydrochloric acid LiF solution, reacted continuously, and the Al layer is selectively dissolved to form Ti3C2T x MXene. The prepared MXene is purified and stripped by centrifugal washing and ultrasonic treatment. After obtaining MXene micron sheets, the color-changing antibacterial microcapsules prepared by the cross-linking method with chitosan as the shell material and the ternary thermochromic component as the core material are combined with the micron sheets to form color-changing antibacterial functionalized MXene. The above composite material is mixed with polyvinyl alcohol (PVA) adhesive to prepare a color-changing antibacterial multifunctional finishing agent, which solves the technical problem of limited antibacterial and color-changing properties of clothing in the prior art.
[0042] In the description of this specification, the description with reference to the terms "an experimental example", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the experimental example or example are included in at least one experimental example or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same experimental example or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more experimental examples or examples in a suitable manner.
[0043] Finally, it should be noted that the above experimental examples are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred experimental examples, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.
Claims
1. A method for preparing an antibacterial color-changing finishing agent, characterized in that: The following steps are included: Step 1: Add LiF powder to a hydrochloric acid solution and stir to prepare an etchant. Then, slowly mix Ti3AlC2 powder and the etchant. After the reaction, wash the product and centrifuge with deionized water until the solution becomes neutral. Remove the residual etchant and impurities to obtain a multilayer Ti3C2T x MXene; Step 2: The multilayer Ti3C2T x MXene was re-ultrasonic dispersed, washed with deionized water for multiple times, centrifuged, and dried to obtain MXene powder; Step 3, dissolving chitosan in an acetic acid solution at room temperature, then adding crystal violet lactone, bisphenol A, and n-hexadecanol, stirring and ultrasonicating to obtain a mixed solution, then, adding glutaraldehyde as a cross-linking agent dropwise in a water bath to obtain chitosan-crystal violet lactone-bisphenol A-n-hexadecanol sol, finally, centrifuging the obtained chitosan-crystal violet lactone-bisphenol A-n-hexadecanol sol, washing the solid precipitate three times with deionized water, treating and drying in a vacuum freeze drying oven to constant weight, and obtaining a color-changing antibacterial microcapsule with chitosan as a shell and crystal violet lactone, bisphenol A and n-hexadecanol as a core; Step 4: Disperse the MXene powder obtained in step 2 in deionized water, and add glacial acetic acid to obtain a MXene dispersion, then add the color-changing antibacterial microcapsules to the MXene dispersion, stir evenly, add cross-linking agents N,N'-methylenebisacrylamide and N,N'-bis(acryloyl)cystamine, and then magnetically stir the MXene-color-changing antibacterial microcapsule mixed system to react to prepare an antibacterial color-changing functionalized MXene material; Step 5: Mix the antibacterial color-changing functionalized MXene material with the PVA adhesive to prepare an antibacterial color-changing finishing agent for sports knitted clothing.
2. The method for preparing an antibacterial color-changing finishing agent according to claim 1, characterized in that: In step 1, the etchant is prepared by adding 3-6 g LiF powder into a beaker containing 60-80 mL hydrochloric acid, the reaction temperature is controlled at 35-45 ° C, and the reaction time is 30-48 h; Ti3AlC2 powder is used as the MXene precursor raw material with a purity of ≥98%.
3. The method for preparing an antibacterial color-changing finishing agent according to claim 2, characterized in that: In step three, the centrifugal speed of chitosan-crystal violet lactone-bisphenol A-n-hexadecanol sol is 7000~10000r / min; crystal violet lactone, bisphenol A, and n-hexadecanol are used as color-changing materials, and the color-changing temperature is 38°C.
4. The method for preparing an antibacterial color-changing finishing agent according to claim 3, characterized in that: In step four, the mass percentage of MXene powder dispersed in the glacial acetic acid solution is 1-3wt%; the mass ratio of MXene powder to color-changing antibacterial microcapsules is 6-8:3-4, the stirring reaction time of MXene powder and color-changing antibacterial microcapsules is 20-30h, and the content of cross-linking agent is 0.1-0.3% of the total mass of the MXene-color-changing antibacterial microcapsule mixed system; the mass ratio of antibacterial color-changing functionalized MXene material to PVA adhesive is 9-7:3-1.
5. The method for preparing an antibacterial color-changing finishing agent according to claim 4, characterized in that: In step 5, the molecular weight of PVA is 10,000-20,000.
6. The method for preparing an antibacterial color-changing finishing agent according to claim 1, characterized in that: In step 1, Ti3AlC2 powder is added to a LiF solution containing hydrochloric acid, and the liquid-to-solid ratio is controlled at 25~20mL:5~1g.
7. The method for preparing an antibacterial color-changing finishing agent according to claim 6, characterized in that: The drying step in step 2 is as follows: the purified MXene suspension is placed in a forced air drying oven at 60-80°C and dried for 24-36 hours.
8. An antibacterial color-changing finishing agent obtained according to the preparation method of an antibacterial color-changing finishing agent according to any one of claims 1 to 7.
9. The antibacterial color-changing finishing agent obtained by the preparation method of an antibacterial color-changing finishing agent according to claim 8, characterized in that: The finishing agent is applied to the surface of the knitted fabric by an impregnation method to obtain antibacterial color-changing functional sports knitted clothing, and the process is as follows: when the sports knitted clothing is dipped into the antibacterial color-changing finishing agent solution, the amount of the antibacterial color-changing finishing agent is 3-5% of the weight of the clothing, the bath ratio of the finishing liquid is 1:10-15, the temperature is 10-30°C, three dips and three rolls, the rolling rate is 70-80%, the time is 20-30min, and then the fabric is dehydrated in a centrifugal dehydrator and dried in a dryer at a drying temperature of 80-100°C for 25-35min.