▎ 摘　　要

NOVELTY - Silicon dioxide-graphene oxide modified bismaleimide composite material comprises 51-58 pts. wt. N,N'-(4,4'-methylenediphenyl)bismaleimide, 9-24 pts. wt. bisphenol A benzoxazine, 22-26 pts. wt. 2,2'-diallyl bisphenol A, 2-3 pts. wt. diallyl phthalate and 1-4 pts. wt. nano-silicon dioxide-graphene oxide composite material. USE - As silicon dioxide-graphene oxide modified bismaleimide composite material. ADVANTAGE - The composite material has high strength and high flame retardance, and utilizes 2,2'-diallyl bisphenol A and diallyl phthalate as chain-extending tougheners, and bisphenol A-type benzoxazine as blending toughener, which improve the chemical crosslink density of the bismaleimide copolymer, and enhance the toughness and tensile strength. The nano-silicon dioxide graphene oxide composite material has high dispersibility and compatibility in bismaleimide materials, when the material burns at a high temperature, the porous silicon dioxide structure and the graphene oxide sheet structure provides protective role as a physical barrier, hinder the diffusion of heat and the penetration of oxygen, and inhibit the combustion process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the modified bismaleimide composite material, involving (a) adding 22-26 pts. wt. 2,2'-diallyl bisphenol A and 1-4 pts. wt. nano-silicon dioxide-graphene oxide composite material to the reaction flask, placing the reaction flask in an oil bath and heating to 130-140 degrees C, stirring at a constant speed for 10-20 minutes, adding 51-58 pts. wt. N,N'-(4,4'-methylenediphenyl) bismaleimide, reacting for 30-40 minutes, reducing the temperature to 115-125 degrees C, adding 2-3 pts. wt. diallyl phthalate, reacting for 20-30 minutes, adding 9-24 pts. wt. bisphenol A benzoxazine and reacting for 20-30 minutes, and (b) putting the material in a deaeration mixer for pre-deaeration process, then placing it in a vacuum drying oven, conducting a vacuum deaeration process at 120-130 degrees C, pouring the material into a mold and placing in an oven, and curing at 160-165 degrees C for 2-3 hours, at 180-185 degrees C for 2-3 hours, at 200-210 degrees C for 2-3 hours, and at 230-240 degrees C for 6-8 hours to prepare the composite material.