| abstract |
The present invention relates to a refrigerating machine oil comprising a refrigerating machine oil containing an ester of a polyhydric alcohol and a fatty acid, a carbodiimide compound and a phosphorus compound, 1,1,1,2-tetrafluoroethane and 2,3,3,3-tetrafluoropropene , Wherein the polyhydric alcohol contains pentaerythritol and dipentaerythritol, the fatty acid contains at least one selected from fatty acids having 4 to 9 carbon atoms, the carbodiimide compound and the phosphorus compound Satisfies the condition expressed by the formula (1). [Formula 1] [N C is the number of carbodiimide groups per molecule of the carbodiimide compound, M C is the molecular weight of the carbodiimide compound, W C is the content of the carbodiimide compound, N P is the number of atoms phosphorus per molecule of the phosphorus compound , M P is the molecular weight of the phosphorus compound, and W P is the content of the phosphorus compound.] |