| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricant oil composition for a refrigerator, especially exhibiting excellent compatibility with difluoromethane, and further to provide a working fluid composition for the refrigerator, comprising the lubricant oil composition and the refrigerant, and excellent in abrasion resistance, lubricant characteristics, stability and the like. SOLUTION: This lubricant oil composition for the refrigerator, using a one-carbon refrigerant free from chlorine consists essentially of a polyoxyalkylene glycol derivative having a specific substituent as a base oil. Preferably, the lubricant oil composition for the refrigerator comprises (a) a polyvinyl ether-based derivative and (b) 0.1-60 wt.% polyoxyalkylene glycol derivative, and has <=5 deg.C two-layer separation temperature at the lower temperature side in any content of the components (a) and (b) within the range of 3-50 wt.% based on the total amount in the one-carbon refrigerant free from the chlorine. The working fluid composition for the refrigerator contains (A) the one-carbon refrigerant free from the chlorine and (B) the lubricant oil composition for the refrigerator. |
