▎ 摘　　要

NOVELTY - Composite material comprises 50-100 pts. wt. polylactic acid, 4-10 pts. wt. chitosan, 2-8 pts. wt. graphene nanoplatelets, 5-15 pts. wt. carbon fiber, 8-16 pts. wt. glass fiber, 6-10 pts. wt. nano-montmorillonite, 1-5 pts. wt. silica sol, 1-5 pts. wt. diaminodiphenylmethane tetraglycidylamine and 1-3 pts. wt. silane coupling agent. The specific surface area of the graphene nanosheet reaches 80-100m2/g and is treated with diaminodiphenylmethane tetraglycidylamine. USE - Composite material. ADVANTAGE - The composite material has good toughness, high temperature resistance, and high comprehensive mechanical strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing composite material, which involves: (A) mixing graphene nanosheets in a dimethylformamide solvent together with diaminodiphenylmethane tetraglycidylamine, mechanically stirring for 1-3 hours, and the rotation speed of 500-1500 revolution per minute, and drying in oven controlled at 45-55 degrees C continuous drying for 6 hours to obtain surface modified graphene nanosheets; (B) mixing the surface-modified graphene nanosheet with the polylactic acid particles uniformly and crushing in a three-roll mill for 20-30 minutes to obtain a polylactic acid graphene mixture; (C) mixing the poly(lactic acid) graphene mixture with chitosan, nano-montmorillonite, silane coupling agent, silica sol, and diaminodiphenylmethane tetraglycidyl amine in a high-mixer for 30 minutes, mixing uniformly by adding to the hopper of the twin-screw extruder to obtain composite; and (D) mixing the obtained composite into carbon fiber and glass fiber at a certain ratio from the fiber-adding port of the twin-screw extruder, melt blending, extruding and cooling to obtain the composite material.