Method for preparing antibacterial polyester material

Abstract

The invention belongs to the technical field of polyester materials, and particularly relates to a method for preparing an antibacterial polyester material. The preparation method comprises the following steps: dispersing titanium carbide nanosheets and an antioxidant in deionized water to form a dispersion liquid; mixing acrylic acid, a cross-linking agent, an antibacterial agent, an initiator and a solvent to obtain a mixed solution; the preparation method comprises the following steps: immersing polyester fibers in a dopamine hydrochloride solution, stirring for reaction, cleaning and drying after reaction, immersing in a dispersion liquid after drying, cleaning and drying after ultrasonic treatment, immersing in a silver nitrate solution after drying, cleaning and drying after reaction, immersing in a 2-methylimidazole solution after drying, cleaning and drying after reaction, immersing in a mixed solution after drying, transferring into a heating mold, heating, and carrying out vacuum drying to obtain the polyester fibers. And reacting to obtain the antibacterial polyester material. The antibacterial polyester material prepared by the invention has a multi-layer structure, and is stable in structure and good in antibacterial effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyester materials, and particularly relates to a method for preparing antibacterial polyester materials. Background Art

[0002] Due to its excellent mechanical properties, chemical corrosion resistance, and easy processability, polyester fibers are widely used in fields such as textiles, medical devices, and protective products. However, polyester fibers themselves do not have antibacterial properties and are prone to becoming carriers for bacteria attachment and reproduction. Especially in medical, protective, and daily use scenarios, the growth of bacteria may lead to infections, disease transmission, and a decline in material properties. Therefore, developing polyester materials with high antibacterial properties has become an important topic in current research and applications. Summary of the Invention

[0003] The present invention aims at the deficiencies of the prior art and provides a method for preparing antibacterial polyester materials.

[0004] The technical solution of the present invention is as follows:

[0005] A method for preparing antibacterial polyester materials, comprising the following steps:

[0006] Titanium carbide nanosheets and an antioxidant are dispersed in deionized water to form a dispersion;

[0007] Acrylic acid, a crosslinking agent, an antibacterial agent, an initiator, and a solvent are mixed to obtain a mixed solution;

[0008] Polyester fibers are immersed in a dopamine hydrochloride solution, stirred and reacted, washed and dried after the reaction, immersed in the dispersion after drying, ultrasonically treated, washed and dried, immersed in a silver nitrate solution after drying, reacted, washed and dried, immersed in a 2-methylimidazole solution after drying, reacted, washed and dried, immersed in the mixed solution after drying, transferred to a heating mold, heated, and an antibacterial polyester material is obtained after the reaction.

[0009] In some embodiments, the dopamine hydrochloride solution is prepared by dissolving dopamine hydrochloride in Tris buffer, and the concentration of the dopamine hydrochloride solution is 1.5 - 2.5 mg / mL.

[0010] In some embodiments, the antioxidant includes vitamin C, the crosslinking agent includes MBA, the initiator includes APS, and the antibacterial agent includes benzalkonium chloride.

[0011] In some embodiments, the titanium carbide nanosheets include titanium carbide MXene nanosheets, with a sheet diameter of 2 - 10 μm and a thickness of 100 - 200 nm.

[0012] In some embodiments, when adding the crosslinking agent, the mass of the crosslinking agent is 0.5% - 3% of the mass of acrylic acid.

[0013] In some embodiments, when adding an initiator, the mass of the initiator is 0.5%-3% of the mass of acrylic acid.

[0014] In some embodiments, when adding an antibacterial agent, the mass of the antibacterial agent is 5%-20% of the mass of acrylic acid.

[0015] In some embodiments, the heating is a water bath heating at 50-60°C for 1-2 hours.

[0016] In some embodiments, the solvent includes deionized water. When adding acrylic acid, the mass concentration of acrylic acid is 5-20% w / v;

[0017] In some embodiments, the silver nitrate solution is prepared by dissolving silver nitrate in methanol.

[0018] In some embodiments, the 2-methylimidazole solution is prepared by dissolving 2-methylimidazole in methanol.

[0019] In some embodiments, the polyester fiber is immersed in the dopamine hydrochloride solution, and stirred and reacted for 12-24 hours under light-shielded conditions.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In the prior art, traditional antibacterial fibers mainly rely on metal ions such as silver-based or organic antibacterial agents, but there are the following limitations: Although the nano-silver material has broad-spectrum antibacterial properties, it is easy to agglomerate and precipitate, resulting in poor antibacterial persistence, and there is a risk of cytotoxicity of high-concentration silver ions. Organic antibacterial agents (such as quaternary ammonium salts) are easy to lose with washing, and may induce drug resistance after long-term use. A single antibacterial mechanism is difficult to cope with complex microbial environments, and the antibacterial effect is limited.

[0022] In this application, an antibacterial polyester material has been successfully prepared, and a multi-layer structure has been constructed. Each layer has a specific function, and multiple antibacterial mechanisms cooperate to improve the antibacterial effect of the polyester material.

[0023] Inner layer: Titanium carbide nanosheets are uniformly dispersed on the PDA-coated polyester fiber to form a nano-composite structure. Middle layer: Ag-ZIF-8 nanocrystals grow in-situ on the surface of the polyester fiber to form a MOF nano-coating. Outer layer: The PAA hydrogel forms a porous network structure, and benzalkonium chloride is loaded therein.

[0024] The photothermal effect of titanium carbide can not only directly sterilize, but also improve the antibacterial activity of Ag + and benzalkonium chloride, achieving a synergistic antibacterial effect of "1+1+1>3".

[0025] The pH responsiveness of the PAA hydrogel enables the on-demand release of the antibacterial agent, which releases the antibacterial agent in an acidic environment caused by bacterial infection or an acidic environment suitable for bacterial growth, thus improving the antibacterial efficiency, reducing costs, minimizing side effects, and enhancing safety.

[0026] The remaining more specific mechanisms are described in detail in the examples. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The experimental methods used below are all conventional methods unless otherwise specified, and the materials, reagents, components, etc. used can be obtained from commercial channels unless otherwise specified.

[0028] Example 1

[0029] Prepare an antibacterial polyester material, and the specific steps are as follows:

[0030] 1. Prepare the inner layer on the polyester fiber

[0031] For the convenience of the experiment, take 10 cm of polyester fiber, pre-wash and dry it for later use.

[0032] Weigh 200 mg of dopamine hydrochloride and dissolve it in 100 mL of Tris buffer to prepare a 2 mg / mL dopamine hydrochloride solution.

[0033] Completely immerse the polyester fiber to be used in the dopamine hydrochloride solution, and under room temperature and in the dark, stir mechanically for 12 - 24 hours. Dopamine self-polymerizes on the surface of the polyester fiber to form a PDA coating.

[0034] Then wash the fiber thoroughly with deionized water to remove the unreacted substances. After washing, dry it in vacuum at 40 - 60 °C to obtain PDA-coated polyester fiber.

[0035] Disperse 50 mg of titanium carbide nanosheets and 5 mg of vitamin C in 100 mL of deionized water by ultrasonic treatment to form a dispersion.

[0036] Immerse the PDA-coated polyester fiber in the dispersion, and under room temperature, perform ultrasonic treatment for 30 - 60 minutes. The purpose of this is to promote the adsorption of titanium carbide nanosheets in the dispersion on the PDA coating.

[0037] After ultrasonic treatment, wash the polyester fiber with deionized water to remove the unadsorbed reactants.

[0038] Then dry it in vacuum at 40 - 60 °C to obtain modified polyester fiber.

[0039] 2. Fabricate an intermediate layer on the inner layer to further form a MOF antibacterial layer

[0040] Dissolve 0.001 mol of silver nitrate (0.17 g) in 100 mL of methanol to obtain a silver nitrate solution.

[0041] Dissolve 0.01 mol of 2-methylimidazole (0.82 g) in 100 mL of methanol to obtain a 2-methylimidazole solution.

[0042] Immerse the modified polyester fiber in the silver nitrate solution and soak for 30 minutes. The purpose is to adsorb silver ions on the surface of the modified polyester fiber.

[0043] After soaking, take out the modified polyester fiber, wash it with methanol to remove the excess reactants. After washing, immerse the modified polyester fiber in the 2-methylimidazole solution and react at room temperature for 1 - 3 hours to in-situ grow Ag-ZIF-8 on the surface of the modified polyester fiber.

[0044] After soaking, take out the modified polyester fiber and wash the fiber with methanol to remove the unreacted substances, such as free silver ions and excess ligands, to avoid the formation of heterophase.

[0045] Then dry it in vacuum at 40 - 60 °C to obtain polyester fiber loaded with a MOF antibacterial layer.

[0046] Regarding Ag-ZIF-8, it should be noted that ZIF-8 is a metal-organic framework material (MOF). In this application, metal ions (Ag + ) and organic ligands (2-methylimidazole) are connected by coordination bonds. Specifically: at room temperature, Ag + rapidly reacts with 2-methylimidazole to form Ag-ZIF-8 crystals. Ag + coordinates with 2-methylimidazole molecules to form a four-coordinate complex. Then, the complexes are further connected through the nitrogen atoms on the imidazole ring to form a three-dimensional Ag-ZIF-8 crystal structure.

[0047] Regarding in-situ growth, since silver ions are pre-adsorbed on the surface of the modified polyester fiber, the reaction between Ag + and 2-methylimidazole only occurs on the surface of the modified polyester fiber. ZIF-8 crystals directly grow on the modified polyester fiber instead of forming a precipitate in the solution. Moreover, the in-situ growth of ZIF-8 crystals on the surface of the modified polyester fiber can improve the binding force, forming strong chemical bonds and physical adsorption between it and the fiber, and the binding force is much higher than simple physical mixing.

[0048] 3. Fabricate an outer layer on the intermediate layer to further form a pH-responsive layer

[0049] Dissolve 10 g of acrylic acid (AA), 0.1 g of MBA (N,N'-methylenebisacrylamide), and 1 g of benzalkonium chloride in 90 mL of deionized water. Mix well, add 0.1 g of APS initiator (ammonium persulfate), and stir evenly to obtain a mixed solution. It should be noted that benzalkonium chloride has no genetic toxicity, the addition amount of benzalkonium chloride is low, and the concentration is low. At this concentration, it has no obvious irritation to intact skin, ensuring the safety of using polyester materials.

[0050] Immerse the polyester fiber loaded with the MOF antibacterial layer into the mixed solution, transfer it to a fiber heating mold, and heat it in a water bath at 50 - 60 °C for 1 - 2 hours to initiate a polymerization reaction to form a PAA (polyacrylic acid) hydrogel coating.

[0051] Thoroughly wash the polyester fiber with deionized water to remove unreacted monomers and residual initiators. After washing, dry it to obtain the antibacterial polyester material, and a hydrogel porous structure loaded with benzalkonium chloride is formed on the surface of the antibacterial polyester material.

[0052] It should be noted that in order to avoid the influence of PAA polymerization on the intermediate layer, such as Ag + dissolution, ZIF-8 framework degradation, etc. Dilute the acrylic acid concentration with deionized water to reduce the acidity, and the addition amounts of the remaining raw materials are even less, only acting on the PAA polymerization. Select a low temperature of 50 - 60 °C to ensure the smooth progress of the polymerization while avoiding the influence of high temperature on the material stability. Moreover, in the previous step, Ag-ZIF-8 grew in-situ on the surface of the polyester fiber and was tightly combined with the polyester fiber, restricting the free movement and dissolution of Ag + Therefore, Ag-ZIF-8 itself has a certain tolerance to weak acids and can support the construction of the outer layer. The Ag-ZIF-8 on the intermediate layer can also increase the surface roughness of the polyester fiber and improve the bonding force between the outer layer and the intermediate layer.

[0053] The manufacturer models of the raw materials involved in the above preparation are as follows:

[0054] Polyester fiber: polyester drawn texturized yarn, DTY 75D / 36F.

[0055] Dopamine hydrochloride: Sigma-Aldrich, ≥98%.

[0056] Tris buffer solution: pH 8.5.

[0057] Titanium carbide nanosheets: titanium carbide (Ti3C2Tx) MXene nanosheets, with a sheet diameter of 2 - 10 μm and a thickness of 100 - 200 nm.

[0058] Vitamin C: L-ascorbic acid, Sigma-Aldrich, ≥99%.

[0059] Silver nitrate: AgNO3, AR grade.

[0060] 2-Methylimidazole: AR grade.

[0061] Acrylic acid: AA, 200, Sigma-Aldrich, ≥99%.

[0062] N,N'-Methylenebisacrylamide: MBA, Sigma-Aldrich, content ≥99%.

[0063] Ammonium persulfate: APS, initiator, Sigma-Aldrich, ≥98%.

[0064] Benzalkonium chloride: Sigma-Aldrich, ≥95%.

[0065] It should be noted that in this example, a "core-shell-shell" multi-layer structure was constructed, integrating functions such as photothermal conversion, MOF antibacterial, and pH-responsive controlled release onto polyester fibers, realizing the preparation of a multifunctional antibacterial material. The functions and principles of each layer structure are as follows:

[0066] (1) When making the inner layer:

[0067] Coating of PDA: Dopamine self-polymerizes under weakly alkaline conditions to form a uniform PDA film / coating on the surface of polyester fibers. PDA has excellent adhesion and can firmly adhere to the surface of polyester fibers, and serves as the "glue" for subsequent loading of photothermal agents. PDA contains catechol structures and has reducibility, which can reduce part of titanium carbide to improve its photothermal performance. PDA can improve the dispersion of titanium carbide nanosheets in water and prevent their aggregation.

[0068] Loading of titanium carbide nanosheets: Titanium carbide nanosheets are a kind of MXene material with excellent photothermal conversion performance or photothermal effect. Under illumination (especially near-infrared light), titanium carbide can absorb light energy and convert it into heat energy, causing the local temperature of the fiber to rise. The photothermal effect of titanium carbide can be used for sterilization, and high temperature can destroy the bacterial structure, resulting in the death of bacteria. Titanium carbide nanosheets can act synergistically with subsequent antibacterial agents (silver ions, benzalkonium chloride) to enhance the antibacterial effect.

[0069] (2) When making the middle layer:

[0070] In-situ growth of Ag-ZIF-8: PDA on the surface of polyester fibers has a strong adsorption ability for Ag + . Immerse the polyester fibers in silver nitrate solution, and Ag + will accumulate on the fiber surface. Immerse the fibers adsorbed with Ag + in 2-methylimidazole solution, and Ag + undergoes a coordination reaction with 2-methylimidazole to in-situ generate Ag-ZIF-8 crystals on the fiber surface.

[0071] Ag-ZIF-8 has a dual antibacterial effect: Ag-ZIF-8 can slowly release Ag + , Ag + has broad-spectrum antibacterial properties and can destroy the bacterial structure. The ZIF-8 framework itself also has certain antibacterial activity and can destroy the bacterial structure. In-situ growth also enhances the binding force, and Ag-ZIF-8 binds firmly to polyester fibers.

[0072] (3) When making the outer layer:

[0073] PAA hydrogel coating: Acrylic acid forms a PAA hydrogel network on the intermediate layer through free radical polymerization under the action of a cross-linking agent (MBA).

[0074] PAA has pH responsiveness. In an acidic environment, the carboxyl group is protonated and the hydrogel shrinks; in a basic environment, the carboxyl group is deprotonated and the hydrogel swells.

[0075] Benzalkonium chloride has broad-spectrum antibacterial activity. It is loaded into the PAA hydrogel by electrostatic adsorption and physical embedding. In an acidic environment caused by bacterial infection or an acidic environment suitable for bacterial growth, the PAA hydrogel shrinks and releases more benzalkonium chloride, enhancing the antibacterial effect; in a normal physiological pH environment, the PAA hydrogel swells and less benzalkonium chloride is released, reducing the irritation to normal tissues.

[0076] In addition, after the outer layer is prepared, it also has a protective effect on the intermediate layer and improves the structural stability.

[0077] Example 2

[0078] Different from Example 1, only the intermediate layer is prepared, and the specific steps are as follows:

[0079] Dissolve 0.001 mol of silver nitrate (0.17 g) in 100 mL of methanol to obtain a silver nitrate solution.

[0080] Dissolve 0.01 mol of 2-methylimidazole (0.82 g) in 100 mL of methanol to obtain a 2-methylimidazole solution.

[0081] Immerse the polyester fibers in the silver nitrate solution for 30 minutes.

[0082] After soaking, take out the polyester fibers, wash them with methanol to remove the excess reactants. After washing, immerse the polyester fibers in the 2-methylimidazole solution and react at room temperature for 1 - 3 hours.

[0083] After soaking, take out the polyester fibers and wash the fibers with methanol to remove the unreacted substances, such as free silver ions and excess ligands, to avoid the formation of heterophases.

[0084] Then, it was dried under vacuum at 40-60 °C to obtain polyester fibers with a loaded MOF antibacterial layer, which served as the final antibacterial polyester material.

[0085] The rest of the raw materials were the same as those in Example 1.

[0086] Example 3

[0087] Different from Example 1, only the outer layer was prepared, and the specific steps were as follows:

[0088] 10 g of acrylic acid (AA), 0.1 g of MBA (N,N'-methylenebisacrylamide), and 1 g of benzalkonium chloride were dissolved in 90 mL of deionized water, mixed evenly, 0.1 g of APS initiator (ammonium persulfate) was added, and stirred evenly to obtain a mixed solution.

[0089] The polyester fibers were immersed in the mixed solution, transferred to a fiber heating mold, and heated at 50-60 °C for 1-2 hours to initiate a polymerization reaction to form a PAA (polyacrylic acid) hydrogel coating.

[0090] The polyester fibers were thoroughly washed with deionized water to remove unreacted monomers and residual initiators. After washing, they were dried to obtain an antibacterial polyester material, and a hydrogel porous structure loaded with benzalkonium chloride was formed on the surface of the antibacterial polyester material.

[0091] The rest of the raw materials were the same as those in Example 1.

[0092] Example 4

[0093] Different from Example 1, only the inner layer was prepared, that is, the modified polyester fibers prepared in step 1 of Example 1 were directly used as the final antibacterial polyester material.

[0094] The rest of the raw materials were the same as those in Example 1.

[0095] Comparative Example 1

[0096] The original polyester fibers without any treatment used the same polyester fibers as in Example 1: polyester drawn textured yarn, DTY75D / 36F.

[0097] The antibacterial test was carried out using the inhibition zone method:

[0098] The bacterial strains selected for the experiments in this application were: Staphylococcus aureus (ATCC 6538, Gram-positive bacterium) and Escherichia coli (ATCC 8739, Gram-negative bacterium).

[0099] Staphylococcus aureus and Escherichia coli were respectively inoculated into LB liquid medium and cultured with shaking at 37 °C and 150 rpm for 12 - 18 hours until the logarithmic growth phase to obtain two kinds of bacterial solutions, namely Staphylococcus aureus bacterial solution and Escherichia coli bacterial solution.

[0100] 10^6 CFU / mL of each of the two bacterial solutions was taken and evenly spread on nutrient agar plates to obtain agar plates coated with the bacterial solutions.

[0101] The final polyester fiber samples of each example and comparative example were cut into small pieces with a diameter of 1 cm and gently placed on the agar plates coated with the bacterial solutions.

[0102] Cultivation: The plates were inverted and cultured in a constant temperature incubator at 37 °C for 24 hours. During the cultivation process, intermittent illumination was carried out for a total of 8 hours, with a wavelength of 808 nm and an illumination intensity of 100 mW / cm 2 。

[0103] Measurement: The diameter (mm) of the antibacterial zone was measured with a vernier caliper.

[0104] The results are shown in Table 1:

[0105] Table 1

[0106]

[0107] Result analysis: Comparative example 1 (untreated polyester fiber): The molecular structure of polyester is compact. Although it can reduce bacterial adhesion, it cannot inhibit bacterial reproduction. The diameter of the antibacterial zone is 0 ± 0.5 mm, with no antibacterial zone or a very small antibacterial zone, indicating that the original polyester fiber itself does not have antibacterial properties.

[0108] Example 1 (complete structure): Through the synergistic effect of multiple antibacterial mechanisms, it has the largest antibacterial zone and shows the strongest antibacterial effect. Titanium carbide nanosheets mainly absorb near-infrared light. Near-infrared light has strong penetration ability, and the middle layer of Ag-ZIF-8 and the outer layer of PAA hydrogel also have relatively weak absorption of near-infrared light. The inner layer of titanium carbide nanosheets absorbs light energy and converts it into heat under illumination, increasing its own temperature. The middle layer of Ag-ZIF-8 and the outer layer of PAA hydrogel both have certain thermal conductivity and can transfer heat. Therefore, heat is transferred from the inner layer to the middle layer and the outer layer and then to the surrounding environment (including bacteria) through heat conduction, thus achieving photothermal antibacterial. The middle layer of Ag-ZIF-8 releases Ag + 。The outer layer is a three-dimensional network structure with a large number of micropores and channels inside. Ag +It exerts an antibacterial effect by diffusing through. The outer PAA hydrogel actively releases benzalkonium chloride in the bacterial growth environment to achieve antibacterial effect. The strong antibacterial effect of Example 1 also reflects that the inner layer, the middle layer and the outer layer are firmly combined with each other, with a stable structure. Under a certain light intensity and time, the photothermal effect of the inner titanium carbide nanosheets will not affect the stability of the middle layer and the outer layer. The thermal stability of the complete structure of this application is also relatively good.

[0109] Example 2 (only the middle layer): Relying on the release of Ag + , the antibacterial effect becomes weaker, the diameter of the antibacterial zone shrinks, and the antibacterial ability is lower than that of Example 1.

[0110] Example 3 (only the outer layer): Relying on the diffusion of benzalkonium chloride, the antibacterial effect becomes weaker, the diameter of the antibacterial zone shrinks, and the antibacterial ability is lower than that of Example 1.

[0111] Example 4 (only the inner layer): Relying on the photothermal antibacterial of titanium carbide nanosheets, the diameter of the antibacterial zone shrinks, and the antibacterial ability is lower than that of Example 1.

[0112] Generally speaking, an antibacterial polyester material has been successfully prepared, and a multi-layer structure has been constructed, with each layer having specific functions. Inner layer: Titanium carbide nanosheets are uniformly dispersed on PDA-coated polyester fibers to form a nanocomposite structure. Middle layer: Ag-ZIF-8 nanocrystals grow in-situ on the surface of polyester fibers to form a MOF nanocoating. Outer layer: The PAA hydrogel forms a porous network structure, and benzalkonium chloride is loaded therein.

[0113] The photothermal effect of titanium carbide can not only directly sterilize, but also improve the antibacterial activity of Ag + and benzalkonium chloride, achieving a synergistic antibacterial effect of "1+1+1>3".

[0114] Bacterial infection will form an acidic environment. Some bacteria are suitable for growing in an acidic environment. For example, bacteria will produce various organic acids (such as lactic acid, acetic acid, etc.) during growth and metabolism, resulting in a decrease in the pH value of the surrounding environment; the vast majority of bacteria are acidic and suitable for growing in an acidic environment. Therefore, the pH-responsive performance of the PAA hydrogel realizes the on-demand release of antibacterial agents: it will release antibacterial agents in an acidic environment, thereby improving the antibacterial efficiency, reducing costs, reducing side effects, and improving safety.

[0115] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than a limitation on the protection scope of the present invention. Any simple modification or equivalent replacement of the technical solution of the present invention by those of ordinary skill in the art does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A method for preparing an antibacterial polyester material, characterized in that: The steps include: Titanium carbide nanosheets and antioxidants are dispersed in deionized water to form a dispersion; Acrylic acid, a cross-linking agent, an antibacterial agent, an initiator, and a solvent are mixed to obtain a mixed solution; The polyester fiber is immersed in a dopamine hydrochloride solution, stirred for reaction, washed and dried after the reaction, immersed in a dispersion solution after drying, washed and dried after ultrasonic treatment, immersed in a silver nitrate solution after drying, washed and dried after the reaction, immersed in a 2-methylimidazole solution after drying, washed and dried after the reaction, immersed in a mixed solution after drying, transferred to a heating mold, heated, and obtained an antibacterial polyester material after the reaction.

2. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: The dopamine hydrochloride solution is prepared by dissolving dopamine hydrochloride in Tris buffer. The concentration of the dopamine hydrochloride solution is 1.5-2.5 mg / mL.

3. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: The antioxidant includes vitamin C, the cross-linking agent includes MBA, the initiator includes APS, and the antibacterial agent includes benzalkonium chloride.

4. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: The titanium carbide nanosheets include titanium carbide MXene nanosheets with a sheet diameter of 2-10um and a thickness of 100-200nm.

5. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: When a cross-linking agent is added, the mass of the cross-linking agent is 0.5%-3% of the mass of acrylic acid.

6. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: When the initiator is added, the mass of the initiator is 0.5%-3% of the mass of the acrylic acid.

7. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: When the antibacterial agent is added, the mass of the antibacterial agent is 5%-20% of the mass of the acrylic acid.

8. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: Heat in a 50-60°C water bath for 1-2 hours.

9. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: The solvent includes deionized water, and when acrylic acid is added, the mass concentration of acrylic acid is 5-20% w / v; The silver nitrate solution is prepared by dissolving silver nitrate in methanol; the 2-methylimidazole solution is prepared by dissolving 2-methylimidazole in methanol.

10. The method for preparing an antibacterial polyester material according to claim 1, characterized in that: The polyester fiber is immersed in the dopamine hydrochloride solution, and stirred to react for 12-24 hours in a light-proof condition.

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