▎ 摘　　要

NOVELTY - Packing film comprises 70-85 pts. wt. graphene in-situ polymerization biodegradable copolyester, 5-20 pts. wt. polylactic acid, 3-5 pts. wt. inorganic filler, 0.1-1 pts. wt. antioxidant, 0.1-1 pts. wt. light stabilizer, and 0.1-1 pts. wt. lubricant. USE - Packing film. ADVANTAGE - The packing film polymerizes the biodegradable copolyester in situ, introduces the graphene component in the polymerization process of the biodegradable polyester material, and makes the biodegradable polyester material larger through the multi-level grid structure of graphene. The molecules are uniformly distributed, molecular weight distribution is narrower, and due to the regularity of molecular structure, it exhibits new characteristics that are not originally available, such as barrier properties, antibacterial properties, and electrical conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the packing film, which involves mixing the in-situ polymerization of graphene, biodegradable copolyester, polylactic acid, inorganic fillers, antioxidants, light stabilizers and lubricants uniformly and then putting into the twin-screw extruder, and melt-mixing at 140-180 degrees C, extrusion pelletizing, air-cooled pelletizing, to obtain a special material for biodegradable antibacterial graphene in-situ polymerization copolyester packng film special material, putting into a three-layer co-extrusion film blowing machine, and blowing the film to obtain a finished product, where preparation of graphene in-situ polymerization and biodegradable copolyester includes aw material configuration, esterification, polycondensation, chain extension, and discharging, reaction raw materials include graphene, two dibasic acids and one dihydric alcohol, and dibasic acid containing purified terephthalic acid, adipic acid, and/or succinic acid.