1 College of Materials Science and Engineering, Hunan University, Changsha 410082 2 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082
Abstract: he work was based on te laboratory-designed ultrasound-assisted ball milling and microwave-assisted ball milling test equipment, the GO lubricant oil was obtained by dispersing the GO in the base oil PAO6 using different dispersion methods (surface modification and dispersion, dispersant dispersion, surface modification and dispersant dispersion). Examinations of the surface features of the GO were conducted by XRD, SEM, TEM etc. before and after modification. The dispersion stability of the GO in the base oil was measured by ultraviolet-visible spectrophotometer (UV-Vis) and Zeta potential, and the dispersion mechanism was analyzed. The results indicated that, compared with surface modification dispersion and dispersant dispersion, the combination of surface modification and dispersant dispersion improved the stability of the GO by 44.8% and 35.5%, respectively. After surface modification of GO, the oxygen-containing functional groups on the surface were reduced, the wettability was improved, and the surface was grafted with a lipophilic long-chain alkyl group, which penetrated into the base oil to improve the dispersion stability of the GO. The dispersant was adsorbed on the surface of the modified graphene oxide (MGO) to form a stable double-layer effect. The nano-MGO particles could generate electrostatic repulsion and form a steric hindrance layer to prevented the particles from colliding with each other and agglomerates which could help the MGO disperse in the basic lubrication oil stably. The work not only dispersed the GO in the base oil PAO6 successfully, but also concluded that the combination of surface modification and dispersant dispersion had the best effect on improving the dispersion stability of GO in the base oil, and the optimal concentration of the dispersant was 0.6%.
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2019, Vol. 33 
