▎ 摘　　要

NOVELTY - Heat-resistant flame-retardant polylactic acid graphene composite material comprises 50-100 pts. wt. polylactic acid, 4-10 pts. wt. chitosan, 2-8 pst. wt. graphene nanosheets, 8-14 pts. wt. carbon fibers, 8-16 pts. wt. glass fibers, 6-10 pts. wt. nano-montmorillonite, 1-5 pts. wt. silica sol, 9-14 pts. wt. expanded graphite, 2-6 pts. wt. attapulgite clays, 1-5 pts. wt. diaminodiphenylmethane tetraglycidylamine, 1-3 pts. wt. silane coupling agent, where specific surface area of the graphene nanosheet reaches 80-100 m2/g and treated with diaminodiphenylmethane tetraglycidylamine. USE - Heat-resistant flame-retardant polylactic acid graphene composite material. ADVANTAGE - The heat-resistant flame-retardant polylactic acid graphene composite materi has excellent flame resistance, good toughness, good high temperature resistance, and high comprehensive mechanical strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a heat-resistant flame-retardant polylactic acid graphene composite material, which involves: (A) palcing graphene nanosheets in a dimethylformamide solvent together with diaminodiphenylmethane tetraglycidylamine, mechanically stirring for 1-3 hours at a rotation speed of 500-1500 rpm, uniformly mixing placed in a drying oven, drying at 45-55 degrees C for 6 hours to obtain surface-modified graphene nanosheet; (B) mixing the surface-modified graphene nanosheet with the polylactic acid particles uniformly and grinding in a three-roll mill for 20-30 minutes to obtain a polylactic acid graphene mixture; and (C) mixing polylactide graphene mixture with chitosan, adding nano montmorillonite, silane coupling agent, silica sol, expanded graphite, attapulgite, diaminodiphenylmethane tetraglycidylamine, high-mixing machine is mixing for 10-30 minutes, adding into the hopper of a twin-screw extruder, adding carbon fiber and glass fiber at a certain ratio from the fiber-adding port of the twin-screw extruder and melt-blended and extruded, cooling extruded material, and pelleting to obtain final product.