REFRIGERATOR OIL COMPOSITION THAT CAN BE USED FOR BOTH HCFC REFRIGERANT AND HFC REFRIGERANT

摘要

PURPOSE: To obtain a refrigerator oil composition which is used for a steam compression refrigerator and can be used for both HCFC refrigerator and HFC refrigerator. CONSTITUTION: A base oil comprising a polyol ester (ester compound) is blended with 1.0mass% or more to less then 5.0mass% phosphoric ester, 0.1-2.0mass% alkyl phosphorothionate and/or aryl phosphorothionate and 0.05-2.0mass% epoxy compound to give the refrigerator oil composition. This composition can eliminate such shortcomings of a polyol ester as a tendency to form sludge and poor lubricity by the synergistic effect of additives while making the best use of such features of a polyol ester that it is excellent in compatibility with a refrigerant, electrical insulating properties and resistance to moisture absorption.