▎ 摘　　要

NOVELTY - Process for preparing lubricating oil improver, involves (i) adding modified graphene additive and base oil to a reactor to perform preliminary stirring to obtain a mixture, (ii) performing electromagnetic treatment of the mixture obtained in step (i) to magnetize the ferromagnetic metal impurities in the mixture, (iii) performing strong magnetic filtration on the treated mixture obtained in step (ii) through a strong magnetic filter to remove the magnetized metal impurities in mixture, (iv) precisely filtering the treated mixture obtained in step (iii) through a precision filter to remove insoluble solid particles in the mixture, (v) thoroughly stirring mixture through a homogeneous emulsification pump, subjecting graphene in mixture to strong shear, centrifugal extrusion, and liquid layer friction in the narrow gap between the stator and rotor of homogeneous emulsification pump, and mixing graphene and base oil, and (vi) circulating steps (i)-(v) for 5-10 times. USE - The process is used for preparing lubricating oil improver. ADVANTAGE - The lubricating oil improver has reduced impurity content. DETAILED DESCRIPTION - Process for preparing lubricating oil improver, involves (i) adding modified graphene additive and base oil to a reactor to perform preliminary stirring to obtain a mixture, where the mass ratio of the graphene and the base oil in the modified graphene additive is 0.001-0.1%, (ii) performing electromagnetic treatment of the mixture obtained in step (i) to magnetize the ferromagnetic metal impurities in the mixture at a magnetic induction intensity of 10-100 Gs for 0.2-0.5 hour, (iii) performing strong magnetic filtration on the treated mixture obtained in step (ii) through a strong magnetic filter at a magnetic induction intensity of 200-350 Gs for 0.3-0.5 hour to remove the magnetized metal impurities in the mixture, (iv) precisely filtering the treated mixture obtained in step (iii) through a precision filter to remove insoluble solid particles in the mixture, where the precision of the precision filter is 10-15 mu m, (v) thoroughly stirring the mixture treated in step (iv) through a homogeneous emulsification pump, subjecting the graphene in the mixture to strong shear, centrifugal extrusion, and liquid layer friction in the narrow gap between the stator and rotor of the homogeneous emulsification pump, and mixing graphene and base oil to form an emulsion with combined effect of impact tearing and turbulence results, and (vi) circulating steps (i)-(v) for 5-10 times to obtain the lubricating oil improver comprising graphene.