▎ 摘　　要

NOVELTY - Preparation of melamine foam-nanocrystalline cellulose-graphene, involves adding aqueous solution of graphene and paraformaldehyde, ultrasonically vibrating, heating to obtain graphene-containing paraformaldehyde solution, adding melamine, adjusting pH, stirring, measuring the viscosity, adding nanocrystalline cellulose aqueous solution to prepare modified melamine resin, adding surfactant, curing agent and foaming agent, stirring, pouring enhanced modified melamine resin into mold, foaming, treating enhanced foam with hydrazine hydrate steam and drying the product. USE - Method for preparing melamine foam-nanocrystalline cellulose-graphene. ADVANTAGE - The method enables preparation of melamine foam-nanocrystalline cellulose-graphene with graphene oxide diameter of 10-20 mu m, and nanocrystalline cellulose with diameter of 5-20 nm, length of 150-350 nm and concentration of 0.1-0.5%. DETAILED DESCRIPTION - Method for preparing melamine foam-nanocrystalline cellulose-graphene, involves dispersing graphene powder in water to form graphene aqueous solution, dispersing nanocrystalline cellulose in water to form aqueous solution of nanocrystalline cellulose, adding aqueous solution of graphene and paraformaldehyde to reactor, heating at 80-110 degrees C, ultrasonically vibrating for 10-30 minutes, uniformly dispersing the graphene in a solution to obtain graphene-containing paraformaldehyde solution with paraformaldehyde concentration of 50-60%, adding melamine, heating at 50-85 degrees C, adjusting pH to 8-9, mechanically stirring at 200-600 rpm for 1.5-3 hours, measuring the viscosity of the mixture in the reactor in real time, using the ice water bath to cool the reactor to stop the reaction, when the viscosity is 800-1000 mPa.second, adding nanocrystalline cellulose aqueous solution to mixed solution, mechanically mixing at 1500-3000 rpm, dispersing nanocrystalline cellulose solution uniformly, adjusting pH to 8-9, heating at 60-90 degrees C, stirring at 1500-3000 rpm until the solution viscosity is 1200-1400 mPa.second, preparing modified melamine resin, adding 2-5 vol.% surfactant, 3-6 vol.% curing agent and 5-8 vol.% foaming agent to resin, mechanically stirring at 2500-3000 rpm for 25-50 seconds to prepare modified reinforced melamine resin, pouring enhanced modified melamine resin into mold, foaming in microwave foaming equipment to obtain enhanced foam, treating the enhanced foam with hydrazine hydrate steam at 60-90 degrees C for 12-24 hours, and drying in air atmosphere at 100-150 degrees C for 1-5 hours. The ratio of melamine to paraformaldehyde is 1:1.8-2.8. The surfactant is selected from Tween 80 (RTM: polyethylene glycol-20 sorbitan monooleate), trimethylammonium chloride, sodium dodecylbenzenesulfonate, sodium glycerate, potassium mono-dodecyl phosphate and/or fatty alcohol polyoxyethylammonium sulfate. The foaming agent is sodium bicarbonate or n-hexane. The curing agent is selected from formic acid, acetic acid, oxalic acid, chloroacetic acid and/or hydrochloric acid.