Abstract: As a solid lubricant, nano-molybdenum disulfide has an excellent tribological performance, and is applied widely in grease. However, besides its small amount, the larger specific surface area and the higher specific surface energy leads nanoparticle to reunite, then forming a larger particles and precipitation, losing the lubrication effect. This paper studied the dispersion stability of lauramidopropylamine modified nano-MoS2 in grease. The structure and state of the modified nano-MoS2 in grease was characterized by IR and SEM techniques. The results showed that the modification of wrapping MoS2 by lauramidopropylamine makes the centrifugal oil separation rate of MoS2 reduce from 64% in blank grease to 25% in modified grease, proving that the surface properties are changed by lauramidopropylamine modification, resulting in better dispersion stability in modified grease.

Key words: nano-molybdenum disulfide, lauramidopropylamine oxide, grease, dispersion stability