▎ 摘　　要

NOVELTY - Carbon-nitrogen co-doped titanium dioxide nanotube modified polylactic acid antibacterial film comprises 0.5-5 pts. wt. modified titanium dioxide nanotube modified graphene, 10-16 pts. wt. chitosan, 77-89 pts. wt. DL-lactide, and 0.5-2 pts. wt. stannous octoate. USE - As carbon-nitrogen co-doped titanium dioxide nanotube modified polylactic acid antibacterial film. ADVANTAGE - The carbon-nitrogen co-doped titanium dioxide nanotube modified polylactic acid antibacterial film has excellent electrical conductivity, promotes the separation of photogenerated electrons and holes under the synergistic effect, and has excellent antibacterial and anti-mildew property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of the carbon-nitrogen co-doped titanium dioxide nanotube modified polylactic acid antibacterial film, which involves (a) adding chitosan to ethanol solvent, adding glacial acetic acid, stirring to dissolve, adding modified titanium dioxide nanotube modified graphene, heating at 40-80 degrees C, reacting for 6-10 hours, removing the solvent, washing and drying to prepare a titanium dioxide nanotube modified graphene grafted chitosan, and (b) adding the titanium dioxide nanotube modified graphene grafted chitosan and DL-lactide to dimethyl sulfoxide solvent, heating at 100-130 degrees C in a nitrogen atmosphere catalyst, adding stannous octoate, reacting for 30-40 hours, cooling the solution, adding distilled water until there is a large amount of precipitation, filtering, washing and drying, placing the solid product in a twin-screw extruder, melting and blending uniformly at 170-180 degrees C, discharging the material and casting into a film at 190-210 degrees C to obtain the product.