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The paper describes methods for manufacturing few-layered graphene by liquid-phase shear exfoliation of graphite and modifying a lubricant using this graphene. The principal difference of the presented technology lies in the fact that graphite is exfoliated in a base oil used to produce the lubricant. Besides, a device was developed to implement the graphite exfoliation process, in which shear forces mainly act on graphite particles. The shear exfoliation was experimentally studied, and it was established that the friction coefficient and the wear spot diameter decrease by 35 and 25 %, respectively, due to the lubricant modification with 0.12-wt.% few-layered graphene. [ABSTRACT FROM AUTHOR]

The paper describes the results of a study of the graphene concentration effect on the viscosity of a base oil for preparing plastic lubricants. It was established that the viscosity of the graphene masterbatch reaches the viscosity of the plastic lubricant at 9-11 wt% for few-layered graphene and 5-8 wt% for multi-layered one. Moreover, at graphene concentrations of 0.1 wt% or more, the wear spot diameter decreases by at least 50 %, whereas the load wear index and bearing strength increase almost 3-fold and 4-fold, respectively. [ABSTRACT FROM AUTHOR]