| 摘要 |
PROBLEM TO BE SOLVED: To obtain a refrigerating machine oil composition excellent in valve caulking proofness, and useful in HFC cooling medium useful in e.g. refrigerators each equipped with reciprocating or rotary closed-type compressor, by incorporating an oxygen-contg. synthetic oil in a mineral oil and/or an olefin polymer as base oil. SOLUTION: This refrigerating machine oil composition is obtained by incorporating (A) a mineral oil (e.g. paraffin or naphthene-based one) and/or an olefin polymer (e.g. polybutene) as base oil with (B) an oxygen-contg. synthetic oil (e.g. an ester, polyglycol, ketone) at 1-30wt.% based on the whole amount of this composition. Incorporation of (C) 0.005-5.0wt.% of a phosphoric ester- based compound in this composition further improves the abrasion resistance and load resistance of this composition. |
