abstract |
(57) [Problem] To provide a lubricating oil composition for a refrigerator having high lubricating performance and sealability in a CO 2 atmosphere as a refrigerant. (A) a refrigerant mainly composed of CO 2 and (B) at least one selected from polyoxyalkylene glycol and polyvinyl ether, A base oil having a kinematic viscosity at 5 ° C. of 5 cSt or more. |