▎ 摘　　要

NOVELTY - A lubricant comprises 100-150 pts. wt. base oil, 1-3 pts. wt. modified graphene, 0.1-0.5 pt. wt. yttrium oxide, 0.1-0.5 pt. wt. boron nitride, 1-3 pts. wt. polyethylene glycol dihydrophthalate, 0.5-1.5 pts. wt. succinate sulfonated hydrogenated castor oil, 1-2 pts. wt. oleic acid diethanolamide borate, 0.5-1.5 pts. wt. defoaming agent, 0.5-1.5 pts. wt. lubricant and 0.5-1.5 pts. wt. antioxidant. USE - Lubricant used in mechanical device. ADVANTAGE - The lubricant is economical, has excellent compatibility, stability and heat conductivity and low friction coefficient, and prolongs the service life of mechanical device. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of lubricant, which involves adding base oil, modified graphene, yttrium oxide, boron nitride, polyethylene glycol dihydrophthalate, succinate sulfonated hydrogenated castor oil and oleic acid diethanolamide borate to ultrasonic stirrer, heating at temperature of 60-80 degrees C and ultrasonically stirring for 30-60 minutes to obtain mixed solution, adding defoaming agent, lubricant and antioxidant to the mixed solution and uniformly stirring.