▎ 摘　　要

NOVELTY - A biodegradable gas adjusting film comprises 50-99 pts. wt. polybutylene adipate terephthalate, 5-50 pts. wt. biodegradable polyester, 1-10 pts. wt. photocatalytic antibacterial agent, 0.001-0.1 pt. wt. trivalent iron ion and/or graphene oxide and/or precious metal ions, 1-5 pts. wt. compatibilizer and 0.1-0.5 pt. wt. opening agent. USE - The biodegradable gas adjusting film used for prolonging fruit shelf life (claimed). ADVANTAGE - The product has good atmosphere regulation function and good fruit fresh-keeping effect, and is green and environment-friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of biodegradable gas adjusting film comprising drying raw materials, mixing, extruding, water-cooling, cutting, blowing, and reeling.