| 摘要 |
<p>PURPOSE: Provided is a refrigerator oil, which has excellent lubricative property and thus can be used stably for a long time in a refrigeration cycle using, as a refrigerant, carbon dioxide in the supercritical state under high temperature and high pressure. CONSTITUTION: The refrigerator oil for a carbon dioxide refrigerant comprises a polyoxyalkylene glycol having a dynamic viscosity of 5-50 mm¬2/s at 100 deg.C and a viscosity index of at least 60, and a polyvinyl ether having a dynamic viscosity of 5-50 mm¬2/s at 100 deg.C and a viscosity index of at least 60. The refrigerator oil comprises the polyoxyalkylene glycol and the polyvinyl ether in a weight ratio of 40:60-99.9:0.1. The refrigerator oil optionally further comprises an acid scavenger or an extreme pressure agent.</p> |
