▎ 摘　　要

NOVELTY - Preparing antibacterial nanofiber yarn involves sequentially carrying out cotton cleaning, cotton carding, combing, drawing, roving, and spinning on the antibacterial fiber, the cotton fiber and the polyamide fiber to obtain antibacterial nanofiber yarn. The antibacterial fiber is prepared by uniformly mixing benzene and aluminum trichloride, stirring, adding acetaldehyde for reaction to obtain an intermediate 1, adding the intermediate 1 into a reaction kettle, stirring, dropwise adding mixed acid for reaction to obtain an intermediate 2, uniformly mixing the intermediate 2, tin and concentrated hydrochloric acid, reacting, and adjusting the pH value of a reaction solution to be alkaline to obtain an intermediate 3. USE - Method for preparing antibacterial nanofiber yarn. ADVANTAGE - The antibacterial nanofiber yarn has a long-lasting antibacterial effect and the good antibacterial effect is maintained even after multiple washings. The antibacterial nanofiber yarn has low preparation cost and good effect. DETAILED DESCRIPTION - Preparing antibacterial nanofiber yarn involves sequentially carrying out cotton cleaning, cotton carding, combing, drawing, roving, and spinning on the antibacterial fiber, the cotton fiber and the polyamide fiber to obtain antibacterial nanofiber yarn. The antibacterial fiber is prepared by uniformly mixing benzene and aluminum trichloride, stirring, adding acetaldehyde for reaction to obtain an intermediate 1, adding the intermediate 1 into a reaction kettle, stirring, dropwise adding mixed acid for reaction to obtain an intermediate 2, uniformly mixing the intermediate 2, tin and concentrated hydrochloric acid, reacting, and adjusting the pH value of a reaction solution to be alkaline to obtain an intermediate 3. The intermediate 3 is dissolved in dichloromethane, stirred, added with triphosgene solution, pH of the reaction solution is adjusted to neutral and reacted to obtain an intermediate 4. The obtained intermediate is refluxed ad added with potassium permanganate and deionized water to obtain an intermediate 5. The intermediate 5 is dissolved in tetrahydrofuran, added with triethylamine and 4-aminopyridine, reacted, added with 3-bromopropyltrimethylammonium bromide, and heated to react to obtain an intermediate 6. 2-Chloro-1,3-propanediol, a sodium hydroxide solution and a dimethyl ammonia solution are added into a reaction kettle for reaction to obtain an intermediate 7 which is dissolved in N,N-dimethylformamide followed by the addition of dibromopropane, potassium iodide and hydroquinone for reaction to obtain an intermediate 8. 5, 5-Dimethylhydantoin, sodium hydroxide and ethanol are added into the reaction vessel, refluxed, stirred and added with dibromopropane for reaction to obtain an intermediate 9. The intermediate 8, intermediate 6, triethylamine and N, N-dimethylformamide are uniformly mixed, reacted and added with intermediate 9 and sodium carbonate. The mixture is reacted to obtain an intermediate 10. Graphene is dispersed in deionized water, gamma-aminopropyltriethoxysilane is added and reacted to obtain modified graphene. The modified graphene is dispersed in N, N-dimethylformamide, followed by the addition of intermediate 10 and 1-hydroxybenzotriazole for reaction to prepare antibacterial graphene. The polyethylene terephthalate (PET) chips and the antibacterial graphene are uniformly mixed, subjected to melt extrusion, and spinning to obtain the antibacterial fiber.