REFRIGERATING MACHINE OIL

摘要

PURPOSE:To obtain a refrigerating machine oil having excellent compatibility with a hydrogen-containing fluoroethane-based refrigeration medium and having excellent lubricating property under the refrigeration medium by adding a zinc alkyldithiophosphate, etc., to an ester-based or polyether-based synthetic oil at a specific amount. CONSTITUTION:The aimed refrigerating machine oil obtained by adding (B) 0.01-2wt.% (preferably 0.05-1wt.%) alkyl and/or aryl dithiophosphoric acid zinc salt expressed by the formula [R3 to R6 are 1-20C alkyl or aryl (preferably 1-8C alkyl or 6-18C aryll] to (A) an ester-based synthetic oil and/or polyether based synthetic oil.