▎ 摘　　要

NOVELTY - Preparation of functionalized graphene involves dissolving a modifier in a solvent, dispersing uniformly, dispersing graphene in the resultant mixed solution at high speed, transferring the resultant mixed slurry to a reaction flask, placing the flask in constant-temperature water bath, and connecting with a stirring device and a condensing reflux device, turning on the stirring device and condensing reflux device, reacting, stirring continuously after the reaction is completed, reducing the temperature of the mixed slurry to room temperature, performing suction filtration, washing the filter cake with absolute ethanol, repeating filtration and washing operations 3-6 times, performing suction filtration of the washed mixed slurry until no droplets flow, placing the resultant filter cake in a surface plate, drying in a vacuum oven, and pulverizing in a high-speed pulverizer, to obtain a black, fluffy, light powder. USE - Preparation of functionalized graphene used for improving antiwear property and self-repairing performance of lubricating oil (claimed) e.g. hydrocarbon lubricating oil. ADVANTAGE - The method provides functionalized graphene having excellent dispersibility in lubricating oil. Through functional modification, the edge of the graphene sheet and the defective portion of the sheet can be grafted with long-chain alkane or amino groups, epoxy group or olefinic small molecule group, such that the graphene has stable compatibility with the hydrocarbon lubricating oil, and can be uniformly dispersed in the lubricating oil. The functionalized graphene sheets have same polarity, and the mutual repulsion between the sheets can maintain the stability of the graphene dispersion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for usage method of functionalized graphene in lubricating oil, which involves adding an additive to a base lubricating oil, placing in 30-80 degrees C-water bath, dispersing for 30-60 minutes, adding 1-5000 ppm functionalized graphene powder, dispersing for 60-240 minutes, placing the resultant mixed slurry in a constant-temperature oven at 40-70 degrees C, leaving still for 1-24 hours, and defoaming.