▎ 摘　　要

NOVELTY - The nanocomposite material comprises multilayered graphene quantum dots and graphitic carbon nitride (g-C3N4) compound in a mass ratio of 0.5-20:1. The graphitic carbon nitride has particle size of 15 nm. The multilayered graphene quantum dots have 10-50 layers. USE - Nanocomposite material used in lubricant friction modifier (claimed). ADVANTAGE - The nanocomposite material enhances dispersibility, stability, and activity time of the lubricating oil, effectively decreases friction coefficient of the lubricating oil, and greatly increases anti-attrition performance and friction performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing nanocomposite material, which involves: (a) mixing melamine with acetic acid with stirring in a crucible in muffle furnace for sintering to obtain porous graphite phase series graphitic carbon nitride (g-C3N4), (b) dissolving the obtained graphitic carbon nitride in deionized water and ultrasonic peeling, (c) adding g-C3N4 to an aqueous solution of a release agent, multilayer graphene oxide and stirring to obtain a mixture, (d) adding the reaction mixture to a reaction kettle and carrying out hydrothermal reaction, and peeling g-C3N4 nanolayers, (e) after cooling the mixture, centrifuging, washing the sediment with ethanol and deionized water repeatedly centrifugally to obtain graphene with g-C3N4 quantum dot nanocomposites; (2) a lubricant friction modifier, which includes0.001-0.02 pts. wt. nanocomposite material, 10-80 pts. wt. dispersants, 1-10 pts. wt. modifier, and 1-10 pts. wt. base oil; and (3) a method for preparing lubricant friction modifier, which involves weighing and mixing the components in a high speed mixer ultrasonically. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic X-ray powder diffraction image of the nanocomposite material.