Refrigerating machine oil composition

摘要

The invention provides a refrigerator oil composition comprising as a base oil at least one oxygen-containing synthetic oil, and containing (a) at least one organic acid of the following formula (XXXIV):
wherein R 71 represents an alkyl group having from 6 to 30 carbon atoms, or an alkenyl group having from 6 to 30 carbon atoms; R 72 represents an alkyl group having from 1 to 4 carbon atoms; and m represents an integer of from 1 to 4, or (b) at least one fatty acid amide,
wherein the oxygen-containing synthetic oil is a polyalkylene glycol. The refrigerator oil composition has good lubricity and is especially effective for reducing the friction in both the oil region and the extreme pressure region in the sliding area between the aluminium materials and the steel materials.