| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a refrigerating machine oil composition that has good lubricating properties and high sealing properties and can be stably used for a long period of time in a compression type refrigerating cycle using a refrigerant comprising carbon dioxide as a main component, and a lubricating method using the composition. <P>SOLUTION: The refrigerating machine oil composition and the lubrication method are provided. The refrigerating machine oil composition comprises a refrigerant comprising carbon dioxide as a main component and a lubricant oil composition. The lubricant oil composition mainly contains an ester oil and a base oil with a dynamic viscosity of 56-130 mm<SP>2</SP>/s at 40°C. The ester oil is an ester from pentaerythritol and a fatty acid of 8C and/or 9C, and/or a carbonic ester. The refrigerating machine oil composition is used in a compression type refrigerating cycle having an oil separator and/or a hot gas line. <P>COPYRIGHT: (C)2009,JPO&INPIT |
