▎ 摘　　要

NOVELTY - Preparing high-quality lubricating oil, comprises (a) preparing base oil; (b) preparing additive by placing graphene into the reaction vessel containing the solution A and stirring uniformly, adding iron salt solution to the reaction vessel after the above operation, processing under ultrasonic response, centrifuging and drying for 1-1.5 hours before removal of modified graphene; and (c) placing the base oil obtained in step (a) into the stirring tank, then adding 5-7 wt.% base oil to the mixing tank and prepared additives, continuing to stir, and then taking out the finished product. USE - The lubricating oil is useful for electromechanical device (claimed). ADVANTAGE - The method has good comprehensive utilization quality; produces product with good lubrication effect, stability and long lasting effect; and improves the service life of components and electromechanical equipment. DETAILED DESCRIPTION - Preparing high-quality lubricating oil, comprises (a) preparing base oil by first placing sucrose polyester into a reactor, adding dimethylformamide to the reactor, stirring continuously for 1-1.5 hours, adding 18-23 wt.% maleic anhydride, 3-5 wt.% ammonium chloride and 0.2-0.4 wt.% disodium edentate into the reactor, maintaining the temperature in the reactor at 60-65 degrees C, stirring for 30-35 minutes and distilling off dimethylformamide; (b) preparing additive by placing graphene into the reaction vessel containing the solution A and stirring uniformly, where the solution A composed of 12-15 pts. wt. sodium hydroxide, 3-5 pts. wt. oleic acid, 2-4 pts. wt. sodium hexametaphosphate, 6-8 pts. wt. silane coupling agent and 90-100 pts. wt. water, adding iron salt solution to the reaction vessel after the above operation, maintaining the temperature in the reactor at 50-55 degrees C, processing under ultrasonic response for 20-25 minutes, removing and centrifuging the solution processed in the reactor, placing the resulting filter residue into a dry box, drying for 1-1.5 hours before removal of modified graphene, and mixing the substances, to obtain additives composed of 15-18 pts. wt. isobutylene sulfide, 7-10 pts. wt. sulfurized calcium alkylphenol, 45-55 pts. wt. methyl methacrylate, 6-9 pts. wt. glycerol acrylate, 5-8 pts. wt. phosphate esters and 3-6 pts. wt. modified graphene; and (c) placing the base oil obtained in step (a) into the stirring tank, then adding 5-7 wt.% base oil to the mixing tank and prepared additives, continuing to stir, and then taking out the finished product.