Patent ID: 9587196
Date: 2017-03-07
CPC Classifications: C09K,C10M,C10N

Claim:
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): wherein, N c represents a number of carbodiimide groups per molecule of the carbodiimide compound, M c represents a molecular weight of the carbodiimide compound, W c represents a content of the carbodiimide compound based on a total amount of the refrigerating machine oil, N p represents a number of phosphorus atoms per molecule of the phosphorus compound, M p represents a molecular weight of the phosphorus compound, and W p represents a content of the phosphorus compound based on a total amount of the refrigerating machine oil.