▎ 摘　　要

NOVELTY - Preparing fully biodegradable graphene alkenyl polybutylene adipate terephthalate packaging bag comprises adjusting the pH of the graphene oxide dispersion with ammonia, adding polyvinyl, stirring, adding starch capable of dissolving, stirring, vacuum spray-drying the solution to obtain starch-modified graphene oxide, dissolving silane coupling agent in ethanol, wet blending with calcium carbonate, naturally drying, crushing to obtain hydrophobic modified nano-calcium carbonate, dry blending the redispersible graphene oxide, maleic anhydride, polybutylene adipate terephthalate master batch, modified calcium carbonate and polybutylene adipate terephthalate master batch, air cooling, cutting pellets and dry blending the graphene alkenyl polybutylene adipate terephthalate master batch and the calcium carbonate modified polybutylene adipate terephthalate master batch, taking the blend as raw material, blowing film by and using bag making machine to obtain the packaging bag. USE - The method is useful for preparing fully biodegradable graphene alkenyl polybutylene adipate terephthalate packaging bag. ADVANTAGE - The degradable packaging bag has full biodegradability and green environmental protection; contains graphene that has excellent soil improvement and fertilizer efficiency and has good strength and isolation performance. The method is simple; has low manufacturing cost and is easy for industrialized production and large-scale promotion. DETAILED DESCRIPTION - Preparing fully biodegradable graphene alkenyl polybutylene adipate terephthalate packaging bag comprises (a) adjusting the pH of the graphene oxide dispersion to 10-11 with ammonia, adding polyvinylpyrrolidone, stirring mechanically for 2 hours, adding starch capable of dissolving, continuing stirring for 2-4 hours, vacuum spray-drying the solution at 60-70degrees Celsius to obtain starch-modified graphene oxide, (b) dissolving silane coupling agent in ethanol, wet blending with calcium carbonate, naturally drying for 24 hours, further drying at 60-80degrees Celsius for 4-6 hours, crushing by a crusher to obtain hydrophobic modified nano-calcium carbonate, (c) dry blending the redispersible graphene oxide, maleic anhydride and polybutylene adipate terephthalate master batch prepared in the step (a) with a mechanical mixer at speed of 300-500revolutions/minutes for 0.5-1.0 hour, further using twin-screw extruder, melt extrusion blending at 155-175degrees Celsius, air cooling, cutting pellets, (d) dry blending the modified calcium carbonate prepared in the step (b) and the polybutylene adipate terephthalate master batch in a mechanical mixer at a speed of 300 revolutions/minutes for 1 hour, further using twin-screw extruder, melt extrusion blending at 155-175degrees Celsius, air cooling, cutting pellets and (e) dry blending the graphene alkenyl polybutylene adipate terephthalate master batch prepared in the step (c) and the calcium carbonate modified polybutylene adipate terephthalate master batch prepared in the step (d) with a crushing mixer at a speed of 300-500 revolutions/minutes for 0.5 hour, taking the blend as raw material, blowing film by film blowing machine and using bag making machine to obtain the packaging bag.