| abstract |
The present invention relates to a refrigerator oil comprising a base oil having an oxygen-containing organic compound as a main component, a kinematic viscosity at 100 ° C of 5 to 50 mm 2 / s, and a viscosity index of 60 or more. Furthermore, it is a refrigeration oil for carbon dioxide refrigerant which mix | blended additives, such as an extreme pressure agent and an acid scavenger. The refrigerator oil is used in refrigeration and air-conditioning equipment such as a compressed refrigerator using carbon dioxide refrigerant, specifically, a car air conditioner, a refrigerator, a freezer, an air conditioner, a heat pump, an oil separator, and / or a compressed refrigeration cycle having a hot gas line. It is possible to provide a refrigeration oil that can be used and is stable in a carbon dioxide atmosphere under supercritical conditions, and has excellent lubricity (wear resistance) and can be used stably for a long time. |