| abstract |
[PROBLEMS] To provide a refrigerator using a refrigerant containing no chlorine such as hydrofluorocarbon, carbon dioxide or hydrocarbon, which has excellent stability against hydrolysis and oxidation, and does not generate sludge in coloring of lubricating oil or long-term use. An optimum lubricating oil composition is provided. To an ester-based or ether-based synthetic lubricating base oil, (A) One or more kinds of alkyl glycidyl ester or a compound containing cyclohexene oxide in the molecule is 0.01% by weight or more and less than 1% by weight, and (B) one kind of diphenylcarbodiimide or bis (alkylated phenyl) carbodiimide compound A lubricating oil composition for a refrigerating machine using a hydrofluorocarbon, carbon dioxide, or hydrocarbon as a refrigerant, comprising the above blended in an amount of 0.01% by weight or more and less than 1% by weight. [Selection figure] None |