Lubricant composition for refrigerating machine employing hydrofluorocarbon as refrigerant

摘要

A lubricant composition (for a refrigerating machine employing a HFC type refrigerant containing at least one selected from the group consisting of HFC-32, HFC-125, and HFC-134a) comprises a base oil of an ester formed from a dihydric or higher polyol as an alcohol and a monobasic aliphatic acid, alone or as a mixture thereof; and additives of, based on the total amount, (1) not less than 0.01 vol% and less than 1.0 vol% of a phosphate, (2) from 0.01 to 1.0 vol% of at least one of an alkylphosphorothionate and an arylphosphorothionate, and (3) from 0.01 to 1.0 vol% of an epoxy compound.