▎ 摘　　要

NOVELTY - Preparation of antibacterial nanomaterial-based foamed film involves preparing composite nanomaterial modified polylactic acid by dripping isopropanol dispersion of borene nanosheet and dichloromethane solution of polylactic acid in acetone dispersion of copper oxide/graphene oxide composite nano-material, ultrasonically processing, adding 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccinimide, mixing, stirring and drying to obtain composite, stirring and melting 15-40 pts. wt. starch, 0.2-2 pts. wt. nucleating agent and 10-30 pts. wt. N-methylpyrrolidone at 135-150 degrees C for 10-30 minutes to obtain premix, mixing 100-200 pts. wt. composite nano-material modified polylactic acid and premix, feeding into twin-screw extruder for extrusion granulation to obtain modified polylactic acid particles, extruding modified polylactic acid particles through two-stage twin-screw extruder, injecting gas blowing agent into twin-screw extruder at rate of 5-10 L/hour and foaming. USE - Preparation of antibacterial nanomaterial-based foamed film (claimed). ADVANTAGE - The preparation method effectively improves hydrophilicity, flexibility, heat resistance and break elongation of the antibacterial nanomaterial-based foamed film, and produces foamed film with excellent antibacterial effect, corrosion resistance, and water retention and moisturizing effect, thereby shortening degradation cycle of foamed film. DETAILED DESCRIPTION - Preparation of antibacterial nanomaterial-based foamed film involves preparing composite nanomaterial modified polylactic acid by dripping 0.05-0.5 mg/mL isopropanol dispersion of borene nanosheet and 20-100 mg/mL dichloromethane solution of polylactic acid in 0.5-5 mg/mL acetone dispersion of copper oxide/graphene oxide composite nano-material, stirring, ultrasonically processing in water bath condition, adding 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccinimide, mixing, stirring at 60-80 degrees C in protective gas atmosphere for 4-8 hours and drying to obtain composite, stirring and melting 15-40 pts. wt. starch, 0.2-2 pts. wt. nucleating agent and 10-30 pts. wt. N-methylpyrrolidone at 135-150 degrees C for 10-30 minutes to obtain premix, mixing 100-200 pts. wt. composite nano-material modified polylactic acid and premix, feeding into twin-screw extruder for extrusion granulation to obtain modified polylactic acid particles, extruding modified polylactic acid particles through two-stage twin-screw extruder, injecting gas blowing agent into twin-screw extruder at rate of 5-10 L/hour and foaming. The mass ratio of polylactic acid, copper oxide/graphene oxide composite nanomaterial, borene nanosheet, EDC and N-hydroxysuccinimide is 100-200:10:1-5:1-5:0.2-1.