▎ 摘　　要

NOVELTY - Method for preparing agent involves (a) adding silver nitrate into aqueous ammonia, controlling the pH value of the solution, and adding water to form a solution A, (b) weighing maltose and polyvinylpyrrolidone (PVP), adding dispersing agent, and adding water to form a solution B, (c) mixing the solutions A and B, adjusting the pH value, and controlling the pH value, (d) performing ultrasonic heat preservation treatment, (e) adding distilled water, sealing and storing, (f) adding sepiolite powder and first silane coupling agent into nano red silver sol, adding polyhexamethylene guanidine, standing and soaking, then adding an acetic acid solution, and keeping the temperature and stirring to obtain C slurry, (g) weighing graphene powder, radiating the graphene powder, adding the graphene powder into water heated, adding second silane coupling agent, adding boric acid solution, stirring, adding the C slurry, stirring, and performing bead milling, and (h) vacuum-drying. USE - The method is useful for preparing agent, which is useful for exhibiting antibacterial effect. ADVANTAGE - The agent is convenient to use and has wide application range and excellent long-term antibacterial effect. DETAILED DESCRIPTION - Method for preparing agent involves (a) adding 1.2-4.8 g silver nitrate into a proper amount of aqueous ammonia to prepare a silver-ammonia solution, controlling pH value of the solution to 10-11, and adding distilled water to 30 g to form a solution A, (b) weighing 3-3.2 g maltose and 0.8 plus minus 0.02 g polyvinylpyrrolidone (PVP), adding 0.3-0.35 g dispersing agent, and adding distilled water to 30 g to form a solution B, (c) slowly and uniformly mixing the solution A and the solution B and adjusting pH to 7.5-8.5 with aqueous ammonia to form a mixed solution, (d) performing ultrasonic heat preservation treatment on the mixed solution to obtain nano silver sol, (e) adding distilled water to the nano silver sol until concentration reaches 120-130 g to obtain nano red silver sol, and sealing and storing the nano red silver sol in a shade place, (f) weighing 100 g high-purity sepiolite powder and 1-5 g first silane coupling agent, adding the sepiolite powder and the first silane coupling agent into 100 g nano red silver sol, adding 0.08-0.12 g polyhexamethylene guanidine, standing and soaking at normal temperature for 24 hours, dropwise adding an acetic acid solution under stirring condition in a water bath at 75-95 degrees C until pH value reaches 5-6, and continuously keeping the temperature and stirring for 3.5-4 hours to obtain C slurry, (g) weighing 10 g graphene powder, radiating the graphene powder for 40 minutes by UV light, immediately adding the graphene powder into 95 g distilled water heated to 85 degrees C in a water bath, dropwise adding 1-5 g second silane coupling agent under stirring condition, dropwise adding 1-3 g 3% boric acid solution, stirring for 1 hour, adding the C slurry, continuously stirring for 0.5 hour, and performing bead milling to obtain graphene modified sepiolite nano-silver antibacterial slurry, and (h) vacuum-drying the obtained graphene modified sepiolite nano-silver antibacterial slurry.