▎ 摘　　要

NOVELTY - Preparing preservative film based on copper oxide/graphene oxide composite anti-bacterial nanomaterial involves preparing copper oxide/graphene oxide composite nanomaterial modified polylactic acid by providing acetone dispersion of copper oxide/graphene oxide composite nanomaterial with concentration of 3-10 mg/mL and methylene dichloride solution of polylactic acid with concentration of 20-100 mg/mL, stirring and adding dichloromethane solution of polylactic acid to acetone dispersion of copper oxide/graphene oxide composite nanomaterial dropwise, and performing water bath ultrasonication. The 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hdroxysuccinimide (NHS) are added to acetone dispersion of copper oxide/graphene oxide composite nanomaterial, mixed system is transferred to 60-80 degrees C under protective gas atmosphere, stirred and reacted for 4-8 hours, and dried to obtain copper oxide/graphene oxide composite nanomaterial modified polylactic acid. USE - The method for preparing preservative film based on copper oxide/graphene oxide composite anti-bacterial nanomaterial. ADVANTAGE - The film realizes the overall antibacterial function of preservative film through copper oxide/graphene oxide composite anti-bacterial nanomaterial with anti-bacterial and anti-septic effects, and has excellent mechanical properties and barrier performance. DETAILED DESCRIPTION - Preparing preservative film based on copper oxide/graphene oxide composite anti-bacterial nanomaterial involves preparing copper oxide/graphene oxide composite nanomaterial modified polylactic acid by providing acetone dispersion of copper oxide/graphene oxide composite nanomaterial with concentration of 3-10 mg/mL and methylene dichloride solution of polylactic acid with concentration of 20-100 mg/mL, stirring and adding dichloromethane solution of polylactic acid to acetone dispersion of copper oxide/graphene oxide composite nanomaterial dropwise, and performing water bath ultrasonication. The 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hdroxysuccinimide (NHS) are added to acetone dispersion of copper oxide/graphene oxide composite nanomaterial, mixed system is transferred to 60-80 degrees C under protective gas atmosphere, stirred and reacted for 4-8 hours, and dried to obtain copper oxide/graphene oxide composite nanomaterial modified polylactic acid. A primary mixture is prepared by providing 85-150 pts. wt. copper oxide/graphene oxide composite nanomaterial modified polylactic acid, 15-40 pts. wt. starch, 10-30 pts. wt. N-methyl pyrrolidone and 2-10 pts. wt. plasticizer, and melting copper oxide /Graphene oxide composite nanomaterial modified polylactic acid, starch, N-methyl pyrrolidone and plasticizer at 175-195 degrees C for 10-30 minutes to obtain a primary mixture. The primary mixture is transferred to a double-screw extruder at 150-165 degrees C for extruding and granulating, where blending time in double-screw extruder is 5-15 minutes, and film forming process is performed to obtain preservative film based on copper oxide/graphene oxide composite anti-bacterial nanomaterial. The mass ratio of the polylactic acid, copper oxide/graphene oxide composite nanomaterial, EDC and NHS is 50-100:10:1-5:0.2-1.