| abstract |
(57) [Abstract] [Purpose] To provide a grease composition for a rotating machine bearing, which has a long life at high temperature and a long life even in a high speed / high temperature life test. [Structure] An alkyldiphenyl ether oil is used as a main component of a base oil part, and a thickener has the following general formula R1-NHCONH-R2-NHCONH-R3 (R2 in the above formula is tolylene, diphenylmethane or dimethyl). R1 and R3 each represent a linear saturated alkyl group having 6 to 18 carbon atoms, a cycloalkyl group and an aromatic hydrocarbon group, the proportion of which is such that the linear saturated alkyl group is 25-45 mol%, 50-70 mol% of cycloalkyl groups and 5 of aryl groups Is comprised within the range of ˜25 mol%. ] The diurea compound represented by 2) was mixed in an amount of 2 to 40 parts by weight with respect to 100 parts by weight of the base oil, and a grease composition for a rotating machine bearing. |