▎ 摘　　要

NOVELTY - The method involves mixing the graphene material with a low-viscosity solvent. The first dispersion is obtained. The first dispersion obtained is mixed with a high-viscosity solvent. A second dispersion is obtained. The low-viscosity solvent is removed from the second dispersion obtained. The graphene material dispersion is obtained. The power of the ultrasound is 50-500W. The ultrasonic time is 5-30 min. USE - Preparation method of graphene material dispersion liquid used as additive to improve combustion efficiency of oil product. Uses include but are not limited to lubricating oil for vehicle. ADVANTAGE - The method provides graphene material with high dispersion efficiency in the high viscosity solution, good stability, improved friction performance of the graphene material, and the process is simple and the cost is low. The method does not need to modify graphene material or introduces dispersing agent and other auxiliary agent help disperse, which can avoid the introduction of impurities, reduce the cost, and improve the high-viscosity solvent, especially the quality of the oil product. The graphene material is prepared by electrochemical stripping method and/or graphene material prepared by reducing graphene oxide, which not only ensures the dispersion effect of graphene material but also can ensure the abrasion resistance, the content is too low, it can not wear and rub, and it has too high content. DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating the preparation method of graphene material dispersion liquid. (Drawing includes non-English language text).