▎ 摘　　要

NOVELTY - Modified graphene/epoxy resin composite material comprises two-phase structure consisting of epoxy resin matrix main body, and black modified graphene as enhanced phase. The modified graphene is uniformly dispersed into epoxy resin matrix. The modified graphene/epoxy resin composite material contains 0.1-1 wt.% modified graphene. USE - Modified graphene/epoxy resin composite material. ADVANTAGE - The modified graphene/epoxy resin composite material is black solid with impact strength of 2-4 KJ/m2, thickness of 1-4 nm, and particle size of 0.2-0.4 mu m in tetrahydrofuran solvent. It has improved toughness, and has improved interface combining performance between graphene and epoxy resin. The preparation increases reaction temperature for preparing middle product graphite oxide, thus improving reaction speed. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of modified graphene/epoxy resin composite material comprising mixing 1.5 g graphite powder, s1.5-2 g solid potassium nitrate and 65-69 ml concentrated sulfuric; heating mixture in water bath at 35-40 degrees C; adding solid potassium permanganate at ratio of 8.0-9.5 g potassium permanganate for 1.5 g graphite powder; stirring and reacting for more than 6 hours; slowly adding 100-200 ml deionized water into mixture; adjusting temperature of water bath at 60-70 degrees C; reacting for 25-40 minutes; adding 200-400 ml deionized water; continuously reacting for 4-5 minutes; dripping 20-50 wt.% hydrogen peroxide solution into mixed liquid until mixed solution is luminous yellow; washing mixed liquid with deionized water until it is neutral; drying in vacuum at gas pressure of 0.05-0.1 MPa and at 80-120 degrees C; putting graphite oxide solid into round bottomed flask; adding tetrahydrofuran solvent at ratio of 0.08 g graphite oxide into 100-200 ml tetrahydrofuran solvent; ultrasonically washing for 1-2 hours to obtain suspension of graphene oxide; adding 2,4-toluene diisocyanate into suspension at ratio of 0.0005-0.001 mol 2,4-toluene diisocyanate into 0.08 g graphite oxide solid; stirring; heating at 75-85 degrees C in water bath; reacting for more than 12 hours to obtain modified graphene; adding amine curing agent (based on relationship that amount amine/100 g epoxy resin is equal to equivalent of active hydrogen in amine multiplied by epoxy value); continuously reacting at 75-85 degrees C for more than 12 hours with stirring; adding epoxy resin based on added dosage of modified graphene in composite material that is 0.1-1 wt.%; uniformly stirring; decompressing and evaporating in vacuum at temperature higher than 70 degrees C and less than curing temperature of epoxy resin, and air pressure of 0.05-0.1 MPa; removing tetrahydrofuran from liquid system until there is no liquid which is evaporated; extracting bubbles included into obtained mixed liquid; restoring to constant pressure; injecting mixed liquid into prepared mold; heating to curing temperature to cure for more than 2 hours at 0.05-0.1 MPa vacuum; cooling to room temperature after fully curing; and de-molding to obtain modified graphene/epoxy resin composite material.