▎ 摘　　要

NOVELTY - Choline modified graphene oxide is obtained by modifying graphene oxide with a deep eutectic solvent containing choline base. USE - Choline modified graphene oxide used for preparing lubricating oil (claimed). ADVANTAGE - The choline modified graphene oxide has excellent dispersion performance and long-term stability performance (not easy to agglomerate), effectively improve the friction performance and stability performance of lubricating oil, it is worth popularizing and using. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. A method for preparing choline modified graphene oxide, which involves mixing the low eutectic solvent and the oxidized graphene according to mass ratio of 14-35: 1, stirring for 2-3 hours at the rotating speed of 400-600rpm at 70-80℃, then separating to obtain the desired product; 2. a lubricating oil, which comprises base oil and choline modified graphene oxide; and 3. a method for preparing lubricating oil, which involves mixing choline-modified graphene oxide and the base oil and ultrasonically dispersing.