▎ 摘　　要

NOVELTY - The preparation method of graphene/copper composite nano-lubricant additive involves adding cupric chloride dihydrate to deionized water, stirring the mixture, adding sodium hydroxide aqueous solution to obtain suspension, filtering the suspension, washing the filtrate with deionized water, dripping formic acid in deionized water and stirring to obtain copper formate aqueous solution, drying copper formate aqueous solution to obtain copper formate solid product, then milling to obtain copper formate powder, stopping heating, and naturally cooling. USE - The method is useful for preparing graphene/copper composite nano-lubricant additive (claimed). ADVANTAGE - The method enables simple preparation of graphene/copper composite nano-lubricant additive with excellent lubricating effect. DETAILED DESCRIPTION - The preparation method of graphene/copper composite nano-lubricant additive involves adding cupric chloride dihydrate to deionized water to prepare 0.3-1 mol/l cupric chloride aqueous solution, stirring the mixture, adding 0.6-2 mol/l sodium hydroxide aqueous solution, where the mass ratio of cupric chloride aqueous solution and sodium hydroxide aqueous solution is 17:8 to obtain suspension, filtering the suspension, washing the filtrate with deionized water, where the mass ratio of filtrate and deionized water is 1:15-30, dripping 10-20% formic acid in deionized water and stirring, where the volume ratio of formic acid and deionized water is 0.1-0.5 ml:100 ml to obtain copper formate aqueous solution, drying copper formate aqueous solution at 80-90 degrees C to obtain copper formate solid product, then milling under speed of 150-250 rpm for 2-12 hours to obtain copper formate powder, placing 10-20 g graphene oxide in quartz tile boat, introducing inert gas, heating at 300-800 degrees C, introducing reduction hydrogen gas at pressure of 0.01-0.1 MPa and flow rate of 100-500 ml/minute for 1-4 hours, stopping heating, and naturally cooling to room temperature to obtain graphene, ball-milling graphene using ball mill under speed of 200-500 rpm for 1-5 hours, and pre-treating to obtain pre-treated graphene, mixing 68 %mass nitric acid with pre-treated graphene in volume ratio of 1 g:10-100 ml, ultrasonically vibrating for 0.5-1 hour, stirring at 60-100 degrees C for 2-4 hours, cooling, vacuum filtering through microporous membrane, washing with water to neutral, then drying, crushing and acidifying to obtain acidified graphene, mixing 0.1-0.6 mol/l sodium hydroxide with acidified graphene in mass ratio of 1 g:600-800 ml, ultrasonically vibrating, carrying out esterification reaction, stirring at 80 degrees C for 1-3 hours, then adding 99.5 %mass, 35-50 ml chloroform, filtering, adding 99.5 %mass 10-15 ml absolute ethanol to the filtrate, drying, and grinding precipitate to obtain esterified graphene, mixing esterified graphene, copper formate powder and methyl silicone oil or lubricating oil in volume ratio of 0.01-0.05 g:1.5-3 g:300-1000 ml, milling for 5-10 hours, and heating at 180-220 degrees C for 0.5-2 hours.