▎ 摘　　要

NOVELTY - Graphene-natural rubber composite toughening modified polylactic acid film is prepared by (a) adding natural rubber to toluene solvent, uniformly stirring and mixing, adding glycidyl methacrylate and benzoyl peroxide, and performing polymerization reaction, (b) adding aminated graphene to toluene solvent, performing uniformly ultrasonic dispersion, adding glycidyl acrylate-rubber copolymer, and centrifuging, (c) adding glycidyl ester-rubber copolymer modified graphene to toluene and dichloromethane mixed solvent, performing ring-opening reaction, continuously adding carbon tetrachloride solution of dibenzyl phosphite and triethylamine, increasing the temperature for performing phosphate esterification reaction, and (d) adding polylactic acid and dibenzyl phosphate-based rubber modified graphene to trichloromethane solvent, heating, performing ultrasonic stirring until uniform mixed solution, dissolving and transferring to automatic film coating machine for film coating. USE - As graphene-natural rubber composite toughening modified polylactic acid film. ADVANTAGE - The film has excellent compatibility with polylactic acid, which is beneficial to dispersion of graphene, adopts graphene to absorb and disperse stress, ensures excellent flexibility, which enhances the ability of polylactic acid film to absorb plastic deformation work, forms physical barrier layer, promotes the formation of carbon in polylactic acid substrate, and further improves the flame retardant properties of polylactic acid film. DETAILED DESCRIPTION - Graphene-natural rubber composite toughening modified polylactic acid film is prepared by (a) adding natural rubber to toluene solvent, increasing the temperature to 40-60degrees Celsius, uniformly stirring and mixing, adding glycidyl methacrylate and benzoyl peroxide, transferring product to oil bath pot, increasing the temperature for performing polymerization reaction, cooling the product, filtering, washing and drying to obtain glycidyl acrylate-rubber copolymer, (b) adding aminated graphene to toluene solvent, performing uniformly ultrasonic dispersion, adding glycidyl acrylate-rubber copolymer, transferring the product to oil bath pot, increasing the temperature for ring opening reaction, centrifuging, washing and drying the product to obtain glycidyl ester-rubber copolymer modified graphene, (c) adding glycidyl ester-rubber copolymer modified graphene to toluene and dichloromethane mixed solvent having volume ratio of 10:(2-4), uniformly dispersing, adding 4-hydroxypiperidine, transferring to oil bath kettle, performing ring-opening reaction in nitrogen atmosphere at 50-70degrees Celsius for 2-6 hours, continuously adding carbon tetrachloride solution of dibenzyl phosphite and triethylamine, increasing the temperature for performing phosphate esterification reaction, centrifuging, washing and drying after completing the reaction to obtain dibenzyl phosphate-based rubber modified graphene, and (d) adding polylactic acid and dibenzyl phosphate-based rubber modified graphene to trichloromethane solvent, heating at 40-60degrees Celsius, performing ultrasonic stirring until uniform mixed solution, dissolving and transferring to automatic film coating machine for film coating to obtain graphene-natural rubber composite toughening modified polylactic acid film.