▎ 摘　　要

NOVELTY - Food preservative bag comprises a water preservative layer, absorbing layer and preservation layer from outside to inside; the water preservative layer is graphene modified polylactic acid layer; the absorbing layer comprises an elastic porous structure and absorbing filler; the absorption filler is filled in the elastic porous structure. The preservative layer is polylactic acid film layer. The waterproof preservative layer and absorption layer and absorption layer and preserving layer are bonded through thermal bonding. USE - Used as food preservative bag. ADVANTAGE - The food preservative bag can maintain food freshness, can prevent the bacteria, and mildew growth, is easy to degrade, and it has good application value. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for food freshness protection process using food preservative bag comprising preparing the graphene modified polylactic acid layer, weighing linear polylactic acid, graphene, maleic anhydride, butanediol, xylitol, dibutyl sebacate, adding into the reaction kettle, raising the temperature to 170-200 degrees C, blending to react for 2-5 hours, blow molding, preparing the graphene modified polylactic acid film layer, taking the natural attapulgite clay, crushing to 200-300 meshes, adding water, stirring to form suspension slurry, then ultrasonic 10-20 minutes, taking the upper suspension liquid at 4000-5000 revolutions/minute, centrifuging for 5-10 minutes, filtering in vacuum, drying the filter cake, then placing it in the muffle furnace of 800-1000 degrees C for 2-4 hours, after cooling, grinding until the grain diameter is 200-300 meshes to obtain the modified attapulgite clay, preparing the graphene modified polylactic acid by the film layer, adsorbing layer and filled with absorbent filler polylactic acid layer, placing in from up to down, through heat-sealing machine and heat sealing, so that the three-layer film layer tightly sealed together. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the food preservative bag.