▎ 摘　　要

NOVELTY - Preparing high-concentration graphene lubricant additive by a weak agglomeration-deagglomeration method, involves (a) dissolving graphene-based materials in a soluble medium, and forming a homogeneous solution, (b) preparing graphene flocculant solution using graphene flocculant chosen from alkali metal solutions, organic ammonium salts, metal cations, polyacrylamide copolymers, alkylamines, stearic acid amides, N,N-dimethylethanolamine, dodecanol, cetyl alcohol and other substance solution to forms electrostatic adsorption or hydrogen bonding with graphene surface groups, where the solvent comprises water, petroleum ether, ethanol and/or n-heptane, (c) dripping the flocculant solution to the graphene-based substance solution, separating flocs from the medium to separate the wet graphene-based substance, transferring the flocs to the solvent, and dispersing the flocs, (d) adding base oil to the graphene-based organic solution, adding a dispersant, and (e) removing the solvent. USE - The process is useful for preparing high-concentration graphene lubricant additive by weak agglomeration-deagglomeration method (claimed). ADVANTAGE - The method obtains high-concentration graphene additive. DETAILED DESCRIPTION - Preparing high-concentration graphene lubricant additive by a weak agglomeration-deagglomeration method, involves (a) dissolving graphene-based materials in an easily soluble medium, and forming a homogeneous solution by stirring, ultrasound and/or homogenization method, (b) preparing graphene flocculant solution using graphene flocculants chosen from alkali metal solutions, organic ammonium salts, metal cations, polyacrylamide copolymers, alkylamines, stearic acid amides, N,N-dimethylethanolamine, dodecanol, cetyl alcohol and other substance solution that forms electrostatic adsorption or hydrogen bonding with graphene surface groups, where the solvent comprises water, petroleum ether, ethanol and/or n-heptane, and the concentration of the flocculant is 1-30%, (c) dripping the flocculant solution to the graphene-based substance solution, using filtration, centrifugation, extraction and/or desiccant water absorption method to separate the flocs from the hydrophilic medium to separate the wet graphene-based substance, transferring the flocs to the organic solvent, and dispersing the flocs using ultrasonic, homogenizing and/or stirring method to form a graphene-based material homogeneous organic solution, (d) adding base oil to the graphene-based organic solution, adding a dispersant, and stirring at 100-5000 rpm, and (e) removing the volatile organic solvent by reduced-pressure distillation method such as rotary evaporation to obtain the additive having a stable concentration of 1-10%.