LUBRICATING OIL FOR COMPRESSION REFRIGERATORS, WORKING FLUID FOR REFRIGERATORS, AND METHOD FOR LUBRICATING REFRIGERATION SYSTEM

摘要

The present invention is directed to a lubricating oil for a compression refrigerator, the lubricating oil comprising a lube base oil which comprises (a) a polyether in which all the oxygen atoms of a tetrahydric or higher polyhydric alcohol residue are bonded to a plurality of hydrocarbon groups each consisting of a carbon atom being bonded to two alkyl groups having 1 to 8 carbon atoms to form ether bonds at the position of the carbon atom and (b) an alkylaromatic compound having a branched alkyl group having 8 to 20 carbon atoms, ; or comprising the foregoing (a) as a lube base oil and (c) 0.5 to 4.5% by weight of a polyoxyalkylene; a working fluid for a refrigerator comprising the above lubricating oil and an HFC refrigerant; and a method for lubricating a refrigeration system compressing the refrigerant, by using the foregoing lubricating oil. The lubricating oil of the present invention can prevent the occurrence of deposition within a refrigeration system and is excellent in lubricity, hygroscopicity, electrical properties. <IMAGE>