ALKYLBENZENE-CONTAINING LUBRICANT FOR FLON COMPRESSOR

摘要

PURPOSE:To provide the titled lubricant having a low viscosity and capable of inhibiting sludge formation, which comprises a particular base oil having a decreased low-boiling fraction content. CONSTITUTION:A flon compressor lubricant comprising an alkylbenzene or a mixed oil of an alkylbenzene and a mineral oil as a base oil, wherein the content of fractions having a boiling point of 330 deg.C (under 1atm) or less of the lubricant is limited to 5vol% or less. The alkylbenzene which can be suitably employed may either have a branched side chain (hard type) or a straight side chain (soft type). A mineral oil of the paraffin group type may be employed. It is preferred that the mixing ratio of alkylbenzene to mineral oil be in the range of about 10:0- about 20:80vol%. When the alkylbenzene is present in an amt. of 20vol% or more, the compatibility with flon and fluidity at low temp. of the lubricant are improved. By the use of the above-mentioned lubricant, a low-viscosity lubrication is ensured, and the sludge formation and adherence around the discharge valve of the compressor can be inhibited.