▎ 摘　　要

NOVELTY - Graphene additive having 1000-40000 centipoise (cps) viscosity and a grind fineness not greater than 15 mu m, and comprises nano-graphene sheets and a silane coupling agent, where weight ratio of the nano-graphene sheets to the silane coupling agent is 0.1-15:99.9-85, and carbon atoms on a surface of the nano-graphene sheets form chemical bonds Si O C with oxygen substituents of the silane coupling agent. USE - Graphene additive. ADVANTAGE - The graphene additive effectively increase the dispersibility of the nano-graphene sheets, and enhances the mechanical strength of the rubbers, so as to increase service lifetime and performances of the rubber, lubricating oil and plastic products. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing a graphene additive, whichinvolves: (A) mixing and stirring nano-graphene sheets and a silane coupling agent, to form a graphene-silane fluid, where each the nano-graphene sheet has a multiple of graphene layers; (B) placing the graphene-silane fluid in a fluid channel having a slit, where a width of the fluid channel is not greater than 500 m, and a width of the slit is not greater than 50 mu m, on a direction perpendicular to a flowing path of the graphene-silane fluid; propelling the graphene-silane fluid in the fluid channel to pass through the slit by applying a pressure not less than 8000 pounds per square inch (psi) to the graphene-silane fluid, and exfoliating the multiple of graphene layers of the nano-graphene sheets; and (C) allowing carbon atoms on a surface of the exfoliated nano-graphene sheets form chemical bonds Si O C with oxygen substituents of the silane coupling agent, to form a graphene additive having a viscosity between 1000 and 40000 cps.