Working Fluid Composition for Refrigerator and Refrigeration Oil

摘要

Disclosed is a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil comprising an ester of a polyhydric alcohol and a fatty acid, a carbodiimide compound, and a phosphorous compound, and at least one refrigerant selected from 1, 1, 1,2-tetrafluoroethane and 2,3,3,3-tetrafluoropropene, the fatty acid comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the carbodiimide compound and the phosphorus compound satisfy the conditions represented by the formula (1):;0.11≦(NCMC·WC)(NPMP·WP)≦4.70(1);wherein, Nc represents the number of carbodiimide groups per molecule of the carbodiimide compound, Mc represents the molecular weight of the carbodiimide compound, Wc represents the content of the carbodiimide compound, Np represents the number of phosphorus atoms per molecule of the phosphorus compound, Mp represents the molecular weight of the phosphorus compound, and Wp represents the content of the phosphorus compound.

主权项

1. A working fluid composition for a refrigerating machine, comprising:
a refrigerating machine oil comprising an ester of a polyhydric alcohol and a fatty acid, a carbodiimide compound, and a phosphorus compound; and at least one refrigerant selected from 1, 1, 1,2-tetrafluoroethane and 2,3,3,3-tetrafluoropropene; wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the carbodiimide compound and the phosphorus compound satisfy conditions represented by the following formula (1):0.11≦(NCMC·WC)(NPMP·WP)≦4.70(1)wherein, Nc represents a number of carbodiimide groups per molecule of the carbodiimide compound, Mc represents a molecular weight of the carbodiimide compound, Wc represents a content of the carbodiimide compound based on a total amount of the refrigerating machine oil, Np represents a number of phosphorus atoms per molecule of the phosphorus compound, Mp represents a molecular weight of the phosphorus compound, and Wp represents a content of the phosphorus compound based on a total amount of the refrigerating machine oil.