▎ 摘　　要

NOVELTY - A modified graphene oxide is obtained by modifying graphene oxide with oil-soluble eutectic solvent comprising hydrogen bond donor and hydrogen bond acceptor. The hydrogen bond donor comprises long-chain alkyl alcohol, and hydrogen bond acceptor comprising organic ammonium salt and/or organic quaternary ammonium salt. USE - Modified graphene oxide used for preparing lubricating oil (all claimed). ADVANTAGE - The long-chain alkyl alcohol has excellent non-hydrophilicity, so the prepared oil-soluble eutectic solvent has excellent hydrophobic property. The product has no strict requirement on the water content in the storage condition, does not need drying treatment before use, and can be prepared by a simple and economical method. The modified graphene oxide has stable dispersibility, and has excellent lubricating effect, so as to solve the problems of poor stable dispersion performance and easy agglomeration of the existing graphene oxide. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: preparation of the modified graphene oxide, which involves dissolving and mixing the hydrogen bond donor and hydrogen bond acceptor at 30-80℃ to obtain oil-soluble eutectic solvent, mixing with graphene oxide, ultrasonically dispersing for 0.5-2 hours at 30-80℃ to obtain mixed solution, reacting at 60-100℃ for 12-48 hours; lubricating oil, which comprises the modified graphene oxide and base oil; and preparation of lubricating oil, which involves adding the modified graphene oxide into the base oil and dispersing.