▎ 摘　　要

NOVELTY - Graphene/lanthanum borate/kaolin composite lubricating oil additive, which is prepared by mixing functional graphene oxide, modified lanthanumlanthanum borate and kaolin in a mass ratio of 1:0.25-4:0.5-8. USE - Graphene/lanthanum borate/kaolin composite lubricating oil additive. ADVANTAGE - The graphene/lanthanum borate/kaolin composite lubricating oil additive where after the composite material and the lubricating oil are mixed in a certain ratio, the four-ball friction and wear test is performed, and the frictional coefficient can be effectively reduced by adding a small amount, and a self-repairing film can be formed on the worn surface to effectively enhance the hardness of the worn surface, further improves the friction and anti-wear ability of the friction surface. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is include for method for preparing a lubricating oil additive involves using graphene oxide as a raw material to prepare a dispersion of graphene oxide, adding a silane coupling agent to react at 25-100 degrees C for 1-6 hours, separating and washing to obtain functional graphene oxide;#under the heating and stirring conditions of 60-90 degrees C, the cerium nitrate aqueous solution and the silane coupling agent are sequentially added to the borax aqueous solution, the reaction is stirred at a constant temperature for 1-5 hours, and the modified bismuthlanthanum borate is separated after cooling; and#mixing the modified lanthanumlanthanum borate and kaolin with the functional graphene oxide dispersion for 0.5-2 hours, reacting at 100-200 degrees C for 1-5 hours, separating and washing to obtain the lubricating oil additive.