Lubricating oils for flon compressors, compositions adapted for flon compressors and composed of mixtures of said lubricating oils and flon, and process for lubricating flon compressor by using said lubricating oils

摘要

A lubricating oil for flon compressor includes, as a main ingredient, a compound represented by a formula (I):PPR. sub.1 --[--O-- (R.sub.2 O).sub.y --(CH.sub.2 CH.sub.2 O).sub.z --H].sub.x (I)P Pin which R.sub.1 denotes a hydrocarbon residue derived from a C. sub.1-8 alcohol having a valence of 1 to 4, R.sub.2 denotes a C.sub.3-4 branched alkylene group, x denotes an integer of 1-4, and y and z each independently denote a positive number, R.sub.2 O units and CH.sub.2 CH. sub.2 O units are block copolymerized in an order shown in the formula (I) , z/(y+z) is more than 0 but not more than 0.3. The lubricating oil has a kinetic viscosity of 2-30 cSt at 100 C. A mixture of the oil having the formula (I) with a lubricating oil having a formula (II): R. sub.3 --[--O--(R.sub.4 O).sub.m --(CH.sub.2 CH.sub.2 O). sub.n --R.sub.5 ]. sub.l may be also used. In the formula (II), R.sub.3 denotes a hydrocarbon residue derived from a CI-s alcohol having one to four hydroxyl groups, R.sub.4 denotes a C.sub.3-4 branched alkylene group, R. sub.5 denotes a C.sub.1-8 alkyl group, l denotes an integer of 1-4, m and n independently denote a positive number, R.sub.4 O units and CH.sub. 2 CH. sub.2 O are block copolymerized, and n/(m+n) is more than 0 but not more than 0.5. A lubricating oil/refrigerant composition contains a minor part of such a lubricating oil and a major part of one or more kinds of flons and is highly useful in a process for lubricating a flon compressor.