| abstract |
(57) [Summary] [Structure] (a) C5-C15 neopentylpolyol, and (b) at least one C1-C3 carbon atom at the α-position and / or β-position relative to the carboxyl group. For refrigerators that use 1,1,1,2-tetrafluoroethane (HFC-134a) as a refrigerant, consisting of an ester compound with a saturated monovalent fatty acid having a total of 4 to 11 carbon atoms with branched alkyl groups as a base oil Lubricant. [Effects] This refrigerating machine lubricating oil has excellent compatibility with halogen-based refrigerants such as HFC-134a as an alternative refrigerant of dichlorodifluoromethane, and has lubricity, thermal stability, hygroscopicity, electrical insulation and It also has excellent hydrolysis resistance. |