Process for the preparation of an antibacterial chlorine-resistant fiber

Abstract

The application provides a preparation method of an antibacterial chlorine-resistant fiber, comprising the following steps: step 1), performing oxygen plasma surface activation treatment on the fiber to obtain pretreated fiber; step 2), immersing the pretreated fiber in a treatment solution and drying; and step 3), ultraviolet light irradiation; in the step 2), the treatment solution comprises 3-12 wt% 2-methyl-2-propenoyloxyethyl phosphate, 0.3-2 wt% N,N'-methylenebisacrylamide and 0.3-3 wt% cationic cyclodextrin material according to the mass percentage. The preparation method of the antibacterial chlorine-resistant fiber provided by the application can obtain an antibacterial chlorine-resistant fiber with good antibacterial chlorine-resistant performance.

Description

Technical Field

[0001] This application relates to the field of fiber materials technology, and in particular to a method for preparing antibacterial and chlorine-resistant fibers. Background Technology

[0002] Currently, medical fiber materials are mainly polypropylene (PP), polyester (PET), and polyamide (PA). Their antibacterial function largely depends on the addition of silver-based, quaternary ammonium salt, or chitosan-based auxiliaries in the finishing process. Chlorine resistance is generally achieved by blending with chlorine-resistant polymers (such as fluorinated polyolefins) or by coating the surface with siloxane-based coatings. International standards ISO 105-E03 and GB / T 8427 stipulate that medical fabrics must maintain a physical strength of ≥85% and an antibacterial rate of ≥99% after being treated with chlorine-containing disinfectant (effective chlorine concentration 200-500 mg / L) more than 20 times.

[0003] The main problems faced by existing technologies are: single antibacterial finishing is easily oxidized and deactivated in chlorine-containing environments, and silver ions are complexed and precipitated by hypochlorite ions, leading to antibacterial attenuation; while chlorine-resistant coatings (such as PDMS) have weak interfacial bonding with the matrix fiber and are easily peeled off after mechanical friction or high-temperature steam sterilization.

[0004] Therefore, it is necessary to provide a surface treatment method for fibers that can maintain and effectively inhibit bacteria after treatment with chlorine-containing disinfectant. Summary of the Invention

[0005] To address the aforementioned technical problems, in a first aspect, this application provides a method for preparing antibacterial and chlorine-resistant fibers, comprising the following steps: Step 1): The fiber is subjected to oxygen plasma surface activation treatment to obtain pretreated fiber; Step 2): Immerse the pretreated fibers in the treatment solution and dry them; Step 3): Ultraviolet irradiation; In step 2), the treatment solution contains 3-12 wt% 2-methyl-2-acryloyloxyethyl phosphate, 0.3-2 wt% N,N'-methylenebisacrylamide, and 0.3-3 wt% cationic cyclodextrin material by mass percentage.

[0006] The inventors discovered that plasma activation introduces peroxy free radicals, driving the controlled grafting polymerization of MAP monomers on the fiber surface. The resulting phosphorylcholine crosslinking network combines zwitterionic antibacterial properties with the chemical inertness of the P=O bond to hypochlorite, simultaneously solving the problems of antibacterial attenuation and chlorine-resistant layer peeling. At the same time, it completely avoids metal ions and fluorine elements, meeting biosafety requirements. The MPC hydration layer repels most bacteria, significantly reducing the bacterial flux reaching the fiber surface. This allows the limited quaternary ammonium salt active sites to more efficiently kill the small number of attached bacteria. The short-chain zwitterionic structure of MPC fills the gaps between cationic cyclodextrin macromolecules, forming a denser and more uniform hydrophilic-cationic mixed surface, reducing "antibacterial dead zones." Quaternary ammonium salt (QAC) can undergo an N-chloro reaction in a chlorine-containing environment to generate an N-chloro structure. This process "fixes" the active chlorine on the fiber surface, preventing it from penetrating into the fiber interior. At the same time, the N-chloro structure can slowly release the active chlorine, maintaining long-lasting antibacterial activity. Thus, MPC and cationic cyclodextrin materials achieve a synergistic effect in antibacterial and chlorine-resistant properties.

[0007] Preferably, in step 2), the treatment solution comprises, by mass percentage, 4.5-5.5 wt% of 2-methyl-2-acryloyloxyethyl phosphate, 0.3-1 wt% of N,N'-methylenebisacrylamide (MBA), and 0.5-1.5 wt% of cationic cyclodextrin material.

[0008] Preferably, the cationic cyclodextrin material is selected from at least one of β-cyclodextrin quaternary ammonium salt covalent derivatives and β-cyclodextrin quaternary ammonium salt inclusion complexes.

[0009] Preferably, the method for preparing the β-cyclodextrin quaternary ammonium salt covalent derivative includes: S1. Dissolve β-cyclodextrin in an alkaline solution, add p-toluenesulfonyl chloride to the alkaline solution at 0-5℃, and stir the reaction to obtain mono-(6-deoxy-6-p-toluenesulfonyl)-β-cyclodextrin. S2. Dissolve mono-(6-deoxy-6-p-toluenesulfonyl)-β-cyclodextrin in 1,3-propanediamine and react at 70-90℃ to obtain propylenediamine-substituted β-cyclodextrin. S3. Dissolve 2,3-epoxypropylalkylammonium halide in an organic solvent, then add the propylenediamine-substituted β-cyclodextrin prepared in step S2, and react at 70-90℃ to obtain the β-cyclodextrin quaternary ammonium salt covalent derivative.

[0010] Preferably, in step S1, the mass-to-volume ratio of the β-cyclodextrin, p-toluenesulfonyl chloride, and alkaline solution is (45-55) g:(30-40) g:(450-550) mL; the alkaline solution is a sodium hydroxide solution with a concentration of 0.3-0.5 M.

[0011] Preferably, in step S2, the mass-to-volume ratio of mono-(6-deoxy-6-p-toluenesulfonyl)-β-cyclodextrin to 1,3-propanediamine is (3-5) g:(15-25) mL; the reaction temperature is 75-85℃; and the reaction time is 3-5 h.

[0012] Preferably, in step S3, the 2,3-epoxypropylalkylammonium halide is selected from at least one of 2,3-epoxypropyltetradecyldimethylammonium chloride, 2,3-epoxypropyldodecyldimethylammonium chloride, and 2,3-epoxypropylhexadecyldimethylammonium chloride; the mass-to-volume ratio of 2,3-epoxypropylalkylammonium halide, propylenediamine-substituted β-cyclodextrin, and organic solvent is (0.7-1.1) g:(4-5) g:(5-15) mL; the reaction temperature is 80-90℃; and the reaction time is 4-6 h.

[0013] Preferably, in step S3, the organic solvent is dimethyl sulfoxide.

[0014] Preferably, the preparation method of the β-cyclodextrin quaternary ammonium salt inclusion complex includes: A1. Dissolve HP-β-CD in an ethanol-water mixture to obtain an HP-β-CD solution; dissolve CTAB in ethanol to obtain a CTAB solution. A2. Mix HP-β-CD solution and CTAB solution, stir for 4-12 hours, remove solvent, grind, sieve, and dry to obtain β-cyclodextrin quaternary ammonium salt inclusion complex.

[0015] Preferably, the cationic cyclodextrin material is composed of a covalent derivative of β-cyclodextrin quaternary ammonium salt and a β-cyclodextrin quaternary ammonium salt inclusion complex in a mass ratio of 1:(1.5-2.5).

[0016] Preferably, the cationic cyclodextrin material is composed of a covalent derivative of β-cyclodextrin quaternary ammonium salt and a β-cyclodextrin quaternary ammonium salt inclusion complex in a mass ratio of 1:2.

[0017] Preferably, in step 1), the fiber is subjected to oxygen plasma surface activation treatment, which includes: treatment for 60-180 s under conditions of oxygen flow rate of 20-50 sccm, power of 80-120 W, and pressure of 30-80 Pa; the fiber includes polypropylene fiber, polypropylene fiber, polyester fiber, and polyamide fiber.

[0018] Preferably, in step 3), the ultraviolet irradiation conditions are an ultraviolet light intensity of 15-30 mW / cm². 2 Irradiate for 120-300 s at a wavelength of 365 nm.

[0019] Secondly, the present invention provides an antibacterial and chlorine-resistant fiber prepared by the above-mentioned method for preparing antibacterial and chlorine-resistant fiber.

[0020] In summary, the present invention has at least one of the following beneficial technical effects: 1. This invention provides a method for preparing antibacterial and chlorine-resistant fibers. 2-Methyl-2-acryloyloxyethyl phosphate and cationic cyclodextrin material are added to the treatment solution simultaneously. As a result, the chlorine-responsive cationic cyclodextrin material is embedded in situ and released in a controlled manner in the phosphorylcholine network, which improves the antibacterial and chlorine-resistant properties of the fiber, giving the fiber an intelligent feedback capability of "the stronger the disinfection, the better the antibacterial effect".

[0021] 2. This invention provides a method for preparing antibacterial and chlorine-resistant fibers. The entire system does not contain metal ions, halogens, or fluorine, and meets all biosafety requirements of YY / T 0316-2022.

[0022] 3. This invention employs plasma activation combined with ultraviolet light-induced in-situ polymerization of MAP. The optimized plasma parameter window enables precise control of hydroxyl density, constructing a covalently anchored crosslinking network layer containing phosphorylcholine structure. In the MAP monomer, the phosphate ester group forms a POC covalent bond with the hydroxyl group on the fiber surface, and the P=O bond exhibits thermodynamic inertness to hypochlorite. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments. However, the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the following embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar with the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to the present invention. The present application will be further described in detail below with reference to specific embodiments.

[0024] Polypropylene fiber fabric was purchased from Jiangsu Jiangyin Jinfeng Special Textile Co., Ltd., SB series (spunbond fabric), weight 30 g / m². 2 White medical grade; HP-β-CD was purchased from Shanghai Yuanye Biotechnology Co., Ltd., item number S11011.

[0025] Preparation Example 1 Preparation Example 1 provides a covalent derivative of β-cyclodextrin quaternary ammonium salt. The preparation method of this covalent derivative of β-cyclodextrin quaternary ammonium salt includes the following steps: S1. Dissolve 50g of β-cyclodextrin in 500mL of 0.4M sodium hydroxide solution. Under ice bath conditions, add 35.0g of p-toluenesulfonyl chloride (TsCl) to the sodium hydroxide solution and stir for 30min. After quickly filtering to remove unreacted TsCl, adjust the pH of the filtrate to 8 with 3M HCl and stir for 1h. After the solid precipitates, filter it. Wash the obtained white solid twice with ultrapure water and three times with acetone, and then dry it under vacuum at 40℃ to obtain mono-(6-deoxy-6-p-toluenesulfonyl)-β-cyclodextrin (Ts-β-CD). S2. Dissolve 4g of mono-(6-deoxy-6-p-toluenesulfonyl)-β-cyclodextrin in 20mL of 1,3-propanediamine and react at 80℃ for 4h. After naturally cooling to room temperature, pour into ethanol, precipitate solid and filter. Wash the obtained white solid with ethanol and then dry under vacuum at 40℃ to obtain propylenediamine-substituted β-cyclodextrin (DAP-β-CD). S3. Dissolve 0.9 g of 2,3-epoxypropyltetradecyl dimethylammonium chloride in 10 mL of dimethyl sulfoxide (DMSO), then add 4.5 g of propylene diamine-substituted β-cyclodextrin (DAP-β-CD), react at 85 °C for 5 h, cool naturally to room temperature, pour into ethanol, filter after the solid precipitates, wash the obtained white solid with ethanol, dry, and obtain the β-cyclodextrin quaternary ammonium salt covalent derivative.

[0026] Preparation Example 2 Preparation Example 2 provides a β-cyclodextrin quaternary ammonium salt covalent derivative, which differs from Preparation Example 1 only in that, in step S3, 2,3-epoxypropyltetradecyldimethylammonium chloride is replaced by an equal mass of 2,3-epoxypropyldodecyldimethylammonium chloride.

[0027] Preparation Example 3 Preparation Example 3 provides a β-cyclodextrin quaternary ammonium salt covalent derivative, which differs from Preparation Example 1 only in that, in step S3, 2,3-epoxypropyltetradecyldimethylammonium chloride is replaced by an equal mass of 2,3-epoxypropylhexadecyldimethylammonium chloride.

[0028] Preparation Example 4 Preparation Example 4 provides a β-cyclodextrin quaternary ammonium salt inclusion complex. The preparation method of this β-cyclodextrin quaternary ammonium salt inclusion complex includes the following steps: A1. Dissolve HP-β-CD in an ethanol-water mixture (ethanol to water volume ratio of 1:1) and control the mass fraction of HP-β-CD to 5% to obtain an HP-β-CD solution. Dissolve CTAB in ethanol and control the mass fraction of CTAB to 5% to obtain a CTAB solution.

[0029] A2. Mix equal volumes of HP-β-CD solution and CTAB solution, and stir at room temperature for 8 hours to obtain a mixture.

[0030] A3. Place the mixture in a rotary evaporator and evaporate under reduced pressure at 40–45°C to remove the solvent, forming a dry solid. Grind the solid, sieve it, and dry it to obtain the β-cyclodextrin quaternary ammonium salt inclusion complex.

[0031] Example 1

[0032] Example 1 provides an antibacterial and chlorine-resistant polypropylene fiber, comprising the following preparation steps: Step 1): The polypropylene fiber fabric is placed in the plasma reaction chamber and treated for 100 s under the conditions of oxygen flow rate of 30 sccm, power of 100W and pressure of 50 Pa to obtain the pretreated polypropylene fiber fabric. Step 2): Immerse the pretreated polypropylene fiber fabric obtained in Step 1) in an aqueous solution containing 5 wt% 2-methyl-2-acryloyloxyethyl phosphate (MAP), 0.5 wt% N,N'-methylenebisacrylamide (MBA), and 1 wt% cationic cyclodextrin material at a bath ratio of 1:50 (the ratio of the mass of the pretreated polypropylene fiber fabric to the volume of the aqueous solution is 1 g:50 mL). Immerse at room temperature for 30 min, remove, and dry with nitrogen. The cationic cyclodextrin material is the β-cyclodextrin quaternary ammonium salt covalent derivative prepared in Preparation Example 1.

[0033] Step 3): Under ultraviolet light intensity of 20 mW / cm 2 Antibacterial and chlorine-resistant polypropylene fibers were obtained by irradiation at a wavelength of 365 nm for 200 s.

[0034] Example 2

[0035] Example 2 provides an antibacterial and chlorine-resistant polypropylene fiber. The difference between Example 2 and Example 1 is that in step 2), the aqueous solution contains 5.5 wt% of 2-methyl-2-acryloyloxyethyl phosphate (MAP), 0.5 wt% of N,N'-methylenebisacrylamide (MBA), and 0.5 wt% of cationic cyclodextrin material.

[0036] Example 3

[0037] Example 3 provides an antibacterial and chlorine-resistant polypropylene fiber. The difference between Example 3 and Example 1 is that in step 2), the aqueous solution contains 4.5 wt% of 2-methyl-2-acryloyloxyethyl phosphate (MAP), 0.5 wt% of N,N'-methylenebisacrylamide (MBA), and 1.5 wt% of cationic cyclodextrin material.

[0038] Example 4

[0039] Example 4 provides an antibacterial and chlorine-resistant polypropylene fiber. The only difference between Example 4 and Example 1 is that the cationic cyclodextrin material is a covalent derivative of β-cyclodextrin quaternary ammonium salt obtained in Preparation Example 2.

[0040] Example 5

[0041] Example 5 provides an antibacterial and chlorine-resistant polypropylene fiber. The only difference between Example 5 and Example 1 is that the cationic cyclodextrin material is a covalent derivative of β-cyclodextrin quaternary ammonium salt prepared in Example 3.

[0042] Example 6

[0043] Example 6 provides an antibacterial and chlorine-resistant polypropylene fiber. The only difference between Example 6 and Example 1 is that the cationic cyclodextrin material is the β-cyclodextrin quaternary ammonium salt inclusion complex prepared in Example 4.

[0044] Example 7

[0045] Example 7 provides an antibacterial and chlorine-resistant polypropylene fiber. The only difference between Example 7 and Example 1 is that the cationic cyclodextrin material is composed of the β-cyclodextrin quaternary ammonium salt covalent derivative prepared in Example 1 and the β-cyclodextrin quaternary ammonium salt inclusion complex prepared in Example 4 at a mass ratio of 1:2.

[0046] Comparative Example 1 Comparative Example 1 provides an antibacterial and chlorine-resistant polypropylene fiber. The only difference between Comparative Example 1 and Example 1 is that, in step 2), the cationic cyclodextrin material (the β-cyclodextrin quaternary ammonium salt covalent derivative prepared in Example 1) is replaced by an equal mass of 2-methyl-2-acryloyloxyethyl phosphate (MAP). That is, in Comparative Example 1, step 2) is: Step 2): Immerse the pretreated polypropylene fiber fabric obtained in Step 1) in an aqueous solution containing 6 wt% 2-methyl-2-acryloyloxyethyl phosphate (MAP) and 0.5 wt% N,N'-methylenebisacrylamide (MBA) at a bath ratio of 1:50 (the ratio of the mass of the pretreated polypropylene fiber fabric to the volume of the aqueous solution is 1 g:50 mL), immerse at room temperature for 30 min, and then remove and dry with nitrogen.

[0047] Comparative Example 2 Comparative Example 2 provides an antibacterial and chlorine-resistant polypropylene fiber. The only difference between Comparative Example 2 and Example 1 is that, in step 2), 2-methyl-2-acryloyloxyethyl phosphate (MAP) is replaced by an equal mass of cationic cyclodextrin material (the β-cyclodextrin quaternary ammonium salt covalent derivative prepared in Preparation Example 1). That is, in Comparative Example 2, step 2) is: Step 2): Immerse the pretreated polypropylene fiber fabric obtained in Step 1) into an aqueous solution containing 0.5 wt% N,N'-methylenebisacrylamide (MBA) and 6 wt% β-cyclodextrin quaternary ammonium salt prepared in Preparation Example 1, with a bath ratio of 1:50 (the ratio of the mass of the pretreated polypropylene fiber fabric to the volume of the aqueous solution is 1 g:50 mL), immerse at room temperature for 30 min, and then remove and dry with nitrogen.

[0048] Comparative Example 3 Comparative Example 3 provides an antibacterial and chlorine-resistant polypropylene fiber. The only difference between Comparative Example 3 and Example 1 is that the cationic cyclodextrin material (the β-cyclodextrin quaternary ammonium salt covalent derivative prepared in Preparation Example 1) is replaced with 2,3-epoxypropyltetradecyldimethylammonium chloride.

[0049] test: Antibacterial rate: The antibacterial properties of the antibacterial and chlorine-resistant polypropylene fibers obtained in the examples and comparative examples were tested according to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Shaking method". The sterilization method was high-pressure steam sterilization, the shaking solution was 0.03M PBS buffer, the temperature was 37℃, the rotation speed was 150 r / min, the contact time was 18h, and Staphylococcus aureus (ATCC 6538) was selected as the test strain.

[0050] Chlorine aging: Prepare an aqueous solution of sodium hypochlorite with an effective chlorine concentration of 1000 mg / L and a pH value of 7.0-7.5, and maintain a constant temperature of 37°C; completely immerse the antibacterial and chlorine-resistant polypropylene fibers obtained in the examples and comparative examples in the sodium hypochlorite aqueous solution for 30 minutes, remove them, rinse thoroughly with deionized water until neutral, and dry at low temperature, which is one chlorine treatment cycle; repeat 40 chlorine aging cycles to obtain chlorine-aged polypropylene fibers, test their antibacterial properties, and calculate the decrease rate of antibacterial rate after chlorine aging. The decrease rate of antibacterial properties after chlorine aging = (antibacterial rate before aging - antibacterial rate after aging) / antibacterial rate before aging.

[0051] The test results are shown in Table 1.

[0052] Table 1

[0053] Comparing Comparative Examples 1 and 2 with Example 1, it can be seen that when only one of MAP or cationic cyclodextrin material is added to the treatment solution, the antibacterial rate of polypropylene fiber is significantly reduced, and the rate of decrease in antibacterial rate after chlorination aging is significantly increased.

[0054] Comparing Comparative Example 3 with Example 1, it can be seen that when the cationic cyclodextrin material in the treatment solution is replaced by an equal mass of the corresponding 2,3-epoxypropyltetradecyldimethylammonium chloride, the antibacterial rate of polypropylene fiber is significantly reduced, and the rate of decrease in antibacterial rate after chlorination aging is significantly increased.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for preparing antibacterial and chlorine-resistant fibers, characterized in that, Includes the following steps: Step 1): The fiber is subjected to oxygen plasma surface activation treatment to obtain pretreated fiber; Step 2): Immerse the pretreated fibers in the treatment solution and dry them; Step 3): Ultraviolet irradiation; In step 2), the treatment solution contains 3-12 wt% 2-methyl-2-acryloyloxyethyl phosphate, 0.3-2 wt% N,N'-methylenebisacrylamide, and 0.3-3 wt% cationic cyclodextrin material by mass percentage.

2. The method for preparing antibacterial and chlorine-resistant fibers according to claim 1, characterized in that, In step 2), the treatment solution comprises, by mass percentage, 4.5-5.5 wt% of 2-methyl-2-acryloyloxyethyl phosphate, 0.3-1 wt% of N,N'-methylenebisacrylamide, and 0.5-1.5 wt% of cationic cyclodextrin material.

3. The method for preparing antibacterial and chlorine-resistant fibers according to claim 1, characterized in that, The cationic cyclodextrin material is selected from at least one of β-cyclodextrin quaternary ammonium salt covalent derivatives and β-cyclodextrin quaternary ammonium salt inclusion complexes.

4. The method for preparing antibacterial and chlorine-resistant fiber according to claim 3, characterized in that, The preparation method of the β-cyclodextrin quaternary ammonium salt covalent derivative includes: S1. Dissolve β-cyclodextrin in an alkaline solution, add p-toluenesulfonyl chloride to the alkaline solution at 0-5℃, and stir the reaction to obtain mono-(6-deoxy-6-p-toluenesulfonyl)-β-cyclodextrin. S2. Dissolve mono-(6-deoxy-6-p-toluenesulfonyl)-β-cyclodextrin in 1,3-propanediamine and react at 70-90℃ to obtain propylenediamine-substituted β-cyclodextrin. S3. Dissolve 2,3-epoxypropylalkylammonium halide in an organic solvent, then add the propylenediamine-substituted β-cyclodextrin prepared in step S2, and react at 70-90℃ to obtain the β-cyclodextrin quaternary ammonium salt covalent derivative.

5. The method for preparing antibacterial and chlorine-resistant fiber according to claim 4, characterized in that, In step S1, the mass-to-volume ratio of β-cyclodextrin, p-toluenesulfonyl chloride, and alkaline solution is (45-55) g:(30-40) g:(450-550) mL; the alkaline solution is a sodium hydroxide solution with a concentration of 0.3-0.5 M; in step S2, the mass-to-volume ratio of mono-(6-deoxy-6-p-toluenesulfonyl)-β-cyclodextrin to 1,3-propanediamine is (3-5) g:(15-25) mL; the reaction temperature is 75-85℃; the reaction time is 3-5 h; in step S3, the 2,3-epoxypropylalkylammonium halide is selected from 2,3-epoxypropyltetradecyldimethylammonium chloride, 2,3-epoxypropyldodecyldimethylammonium chloride, and 2,3- At least one of glycidyl hexadecyl dimethyl ammonium chloride; the mass-to-volume ratio of 2,3-glycidyl ammonium halide, propylenediamine-substituted β-cyclodextrin, and organic solvent is (0.7-1.1) g:(4-5) g:(5-15) mL; the reaction temperature is 80-90℃; and the reaction time is 4-6 h.

6. The method for preparing antibacterial and chlorine-resistant fiber according to claim 3, characterized in that, The preparation method of the β-cyclodextrin quaternary ammonium salt inclusion complex includes: A1. Dissolve HP-β-CD in an ethanol-water mixture to obtain an HP-β-CD solution; dissolve CTAB in ethanol to obtain a CTAB solution. A2. Mix HP-β-CD solution and CTAB solution, stir for 4-12 hours, remove solvent, grind, sieve, and dry to obtain β-cyclodextrin quaternary ammonium salt inclusion complex.

7. The method for preparing antibacterial and chlorine-resistant fiber according to claim 3, characterized in that, The cationic cyclodextrin material is composed of a covalent derivative of β-cyclodextrin quaternary ammonium salt and a β-cyclodextrin quaternary ammonium salt inclusion complex in a mass ratio of 1:(1.5-2.5).

8. The method for preparing antibacterial and chlorine-resistant fiber according to claim 1, characterized in that, In step 1), the fibers are subjected to oxygen plasma surface activation treatment, including: treatment for 60-180 s under conditions of oxygen flow rate of 20-50 sccm, power of 80-120 W, and pressure of 30-80 Pa; the fibers include polypropylene fibers, polyester fibers, and polyamide fibers.

9. The method for preparing antibacterial and chlorine-resistant fiber according to claim 1, characterized in that, In step 3), the ultraviolet irradiation conditions are irradiation for 120-300 s at an ultraviolet light intensity of 15-30 mW / cm² and a wavelength of 365 nm.

10. An antibacterial and chlorine-resistant fiber prepared by the method of any one of claims 1-9.

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