| abstract |
(57) [Summary] [Structure] Lubricating oil prepared by blending an acidic phosphite ester and an amine compound with a base oil whose main component is an ester-based, polyalkylene glycol-based or carbonate-based synthetic oil or a mixed oil thereof. A composition for a working fluid of a refrigerator, comprising the composition and hydrofluorocarbon. [Effect] According to the present invention, excellent lubricity, compatibility with hydrofluorocarbons, and the like, can significantly reduce the amount of wear on the metal contact surface compared with the conventional combined use system of a phosphorus compound and an amine compound. A refrigerating machine working fluid composition can be provided. |