▎ 摘　　要

NOVELTY - A lubricating oil additive is prepared using graphene nanosheets and dispersing agent, dispersing graphene nanosheets in dispersing agent, and graft-modifying the graphene nanosheets by long-chain groups in the dispersing agent. USE - Lubricating oil additive used in refrigerating machine oil for compressor for refrigeration device (all claimed). ADVANTAGE - The lubricating oil additive can prevent agglomeration and sedimentation of graphene nanosheets through steric hindrance effect, so as to continuously exert lubricating function of graphene nanosheets, reduce friction loss of the moving component in reciprocating compressor during operation, and improve energy efficiency. The active groups exposed in the dispersing agent molecules and the graphene molecules undergo chemical reactions and are grafted on the surface of the graphene nanosheets. The electron cloud structure of graphene carbon atoms is changed, which further reduces the intermolecular force of graphene and prevents the agglomeration of graphene. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of the lubricating oil additive, which involves: (a) stirring and reacting the graphene sheet, grafting dispersing agent and auxiliary dispersing under ultrasonic condition; (2) refrigerating machine oil, which comprises base oil and the lubricating oil additive; and (3) a compressor, which includes a shell component, a moving component, arranged in the shell component, where the lubricating oil additive or the refrigerating machine oil is provided in the shell component, and the moving component is lubricated while the compressor is running.