| 摘要 |
PROBLEM TO BE SOLVED: To obtain a refrigerator machine oil to be used in compressor for a refrigeration system, for example, a refrigerator using hydrofluorocarbon as a refrigerant by making the machine oil contain an ester-based synthetic oil as a main component and adding a specific monocarbonate at a specific rate to the refrigerator machine oil. SOLUTION: An ester-based synthetic fluid is made to be included as a main component and a monocarbonate of the formula (R1 and R2 are each a 3-10C hydrocarbon chain) is added 2.8×10-6-2.8×10-4 mole per 1 cm3 of the refrigerator machine oil. This oil suppresses the formation of carboxylic acids by hydrolysis, inhibits the corrosive-wearing of the metal and the copper plating phenomena. In addition, this machine oil secures the dissolution of the reaction products into the hydraulic medium to prevent the capillary tubes from being clogged and increase the lubricity. |
