▎ 摘　　要

NOVELTY - Preparing graphene nanomaterial containing multifunctional auxiliary agent comprises e.g. dissolving protected amino toluene in carbon disulfide, oxidizing to obtain intermediate product 1, adding graphene oxide and solvent dimethylformamide into reaction flask, adding dimethylformamide solution of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and N-hydroxysuccinimide for activation, adding polyethylene glycol diamine, carrying out amidation, adding obtained amidation product and intermediate product 1, adding water, performing ultrasonication, adjusting pH to obtain mixed solution, adding sodium aminoborohydride, reacting, freezing and drying to obtain intermediate product 2, dispersing intermediate product 2 in mixed solvent of methanol and tert-butanol, adding palladium on carbon, reacting to obtain modified graphene i.e. 3,14-dihydroxydibenzo(bc,kl)coronene-5,12-dicarboxamide compound (I), and dispersing modified graphene and auxiliary dispersant in solvent system. USE - The method is useful for preparing graphene nanomaterial containing multifunctional auxiliary agent. ADVANTAGE - The graphene nanomaterial containing multifunctional auxiliary agent: has excellent stability; and improves the anti-corrosion performance of the coating. The method: utilizes dispersant which enhances dispersibility of modified graphene in various solvent systems. DETAILED DESCRIPTION - Preparing graphene nanomaterial containing multifunctional auxiliary agent comprises (i) dissolving amino toluene in mixed solution of ethanol and water, adding sodium bicarbonate, cooling to 5 degrees C and adding dioxane solution of benzyl chloroformate, then stirring and reacting at 0 degrees C to obtain protected amino group, (ii) dissolving protected amino toluene in carbon disulfide, and oxidizing the methyl group to the aldehyde group according to Etard reaction to obtain intermediate product 1, (iii) adding graphene oxide and solvent dimethylformamide into the reaction flask, then ultra-dispersing it uniformly, then dripping dimethylformamide solution of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and N-hydroxysuccinimide to the reaction flask for activation, then adding polyethylene glycol diamine and carrying out amidation at 80-100 degrees C for 24 hours, (iv) adding obtained amidation product and intermediate product 1 into reaction flask, adding water and performing ultrasonication to obtain dispersion uniform, adjusting the pH to 6.5 to obtain mixed solution, adding sodium aminoborohydride into mixed solution, and stirring and reacting at room temperature for 12 hours, after the completion of the reaction, filtering, then freezing and drying to obtain intermediate product 2, (v) dispersing the intermediate product 2 in a mixed solvent of methanol and tert-butanol, adding a catalytic amount of palladium on carbon, and passing in hydrogen, stirring and reacting for 3 hours to de-protectng the amino group, filtering and drying to obtain modified graphene i.e. 3,14-dihydroxydibenzo(bc,kl)coronene-5,12-dicarboxamide compound of formula (I), and (vi) dispersing modified graphene and auxiliary dispersant in the solvent system to obtain final product.