Abstract: Five kinds of lithium grease samples were prepared under the same content of lithium soap and the same technological conditions by using poly-α-olefin synthetic oil and diester synthetic oil as base oil in five different proportions. The influence of synthetic base oil with similar viscosity and different types on the performance of lithium grease was analyzed through the thermal stability, low temperature type, shear stability and colloidal stability of five kinds of lithium grease samples. The results show that the shear stability and colloidal stability of the lithium grease prepared from diester synthetic oil are better than the lithium grease prepared from poly-α-olefin synthetic oil, while the lithium base grease prepared from poly-α-olefin synthetic oil has excellent thermal stability and low temperature performance due to the low pour point and low evaporation loss at high temperature.

Key words: synthetic base oil, lithium grease, shear stability, colloidal stability