A Study on the Effects of Temperature Changes on the Rheological Properties of Lithium Lubricating Grease and Data Processing

In order to study the rheological properties of lubricating grease, poly A olefins (PAO) synthetic oil as base oil and 12 - hydroxy stearic acid lithium soap as the thickener were used to prepare lithium lubricating grease. The effects of temperatures on the thixotropic ring areas, storage modulus, loss modulus, strain amplitudes and apparent viscosities of lithium grease were investigated, and the mechanism was discussed accordingly. The results showed that lithium-based grease was a yield pseudoplastic fluid, and its apparent viscosity was dependent on shear rate and time, which exhibited a typical viscoelasticity. With the increase of temperature, the structure of lithium grease became unstable. When the temperature was higher than 100 degrees C, the structure of lithium grease will be destroyed seriously, and its performance will change significantly. At 75 degrees C, the viscoelasticity of lithium grease was remarkable; At 0 degrees C, the lithium grease showed an obvious anti-thixotropy.