| 摘要 |
PROBLEM TO BE SOLVED: To prepare a compsn. which has excellent lubricity and can reduce abrasion loss in the metal contact face by incorporating a lubricating oil compsn., prepd. by incorporating a phosphorus compd. and an oxygen-contg. amine compd. into a particular base oil for a synthetic oil, and a hydrofluorocarbon. SOLUTION: This compsn. for a hydraulic fluid of a refrigerator comprises a lubricating oil compsn. comprising a base oil composed mainly of an ester, a polyalkylene glycol, or a carbonate synthetic oil or a mixture of the above oils and a phosphorus compd. represented by formula I and/or formula II and an oxygen-contg. amine compd. represented by formula III incorporated into the base oil; and hydrofluorocarbon. In the above formulae, R<1> R<2> , and R<5> each represent a 2-4C alkylene; R<3> , R<4> , R<6> , and R<7> each represent H, a 1-18C straight- chain alkyl, a 3-18C branched alkyl, 6-18C aryl or the like; (p), (q), and (r) are 0 to 30; R<8> , R<9> , and R<10> represent H, a 1-18C straight-chain alkyl, a 3-18C branched alkyl, a 6-18C aryl, or an R<13> -(OR<14> )s - group (wherein R<13> has the same meaning as R<3> or the like; R<14> represents a 2-18C straight-chain alkylene or a 3-18C branched alkylene; and (s) is 1 to 30). |
