▎ 摘　　要

NOVELTY - Heat-resistant flame-retardant polylactic acid composite material comprises 50-100 pts. wt. polylactic acid, 4-10 pts. wt. chitosan, 2-8 pts. wt. graphene nanosheets, 5-14 pts. wt. carbon fibers, 5-12 pts. wt. glass fibers, 5-10 pts. wt. mica, 1-5 pts. wt. silica sol, 10-18 pts. wt. expanded graphite, 2-6 pts. wt. attapulgite clays, 1-5 pts. wt. diaminodiphenylmethane tetraglycidylamine, and 1-3 pts. wt. silane coupling agent, where specific surface area of the graphene nanosheet reaches 80-100 m2/g and is treated with diaminodiphenylmethane tetraglycidylamine. USE - Heat-resistant flame-retardant polylactic acid composite material. ADVANTAGE - The heat-resistant flame-retardant polylactic acid composite material has excellent flame resistance, good toughness, good high temperature resistance, and has high comprehensive mechanical strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing heat-resistant flame-retardant polylactic acid composite material, which involves: (A) placing graphene nanosheets in a DMF solvent together with diaminodiphenylmethane tetraglycidylamine, mechanically aging for 1-3 hours at a rotation speed of 500-1500 rpm, uniformly mixing, and placing in a drying oven at a temperature Control drying at 45-55 degrees C for 6 hours to obtain surface modified graphene nanosheets; (B) mixing the surface-modified graphene nanosheet with the polylactic acid particles uniformly and grinding in three-roll mill for 20-30 min to obtain a polylactic acid graphene mixture; and (C) mixing the polylactic acid graphene mixture with chitosan, mica, silane coupling agent, silica sol, expanded graphite, attapulgite, diaminodiphenylmethane tetraglycidylamine according to the above ratio in the high-mixer, mixing mixture for 10-30 minutes, mixing uniformly, adding into the hopper of a twin-screw extruder, adding carbon fibers and glass fibers at a certain ratio from the fiber-adding port of the twin-screw extruder, melt-blending materials, and extruding, cooling, and blow-drying pellets to obtain final product.