PURPOSE: To extremely reduce wear of metal part in the interior of compressor when using a hydrofluorocarbon or a hydrocarbon as a refrigerant and to obtain the subject stable composition, comprising a specific organic phosphorus compound.
CONSTITUTION: This lubricating oil composition for refrigerator using a hydrofluorocarbon as a refrigerant comprises an organic phosphorus compound selected from an organic phosphonic ester of formula I (R1 and R2 are 1-18C alkyl, 6-18C aryl, etc.; R3 is 2-18C alkenyl, 6-18C aryl, etc.), an phosphoric ester of formula II (R8 to R10 are 1-18C alkyl or 3-18C alkenyl) and an organic phosphoric ester of formula III (R11 to R13 are oxypropylene; PO is oxypropylene; (d) to (i) are 0 or ≥1 with the proviso that (d) to (i) are not 0 at the same time) or is obtained by blending the organic phosphorus compound with a base oil comprising a polyalkylene glycol, an ester oil and a fluorine-containing oil so as to give >10wt.% content of the organic phosphorus compound in the base oil.
KATO TADANORI
SAITO HARUO
FUKUHARA TAKAO
WACHI TOSHIO
TAKENAKA YASUTAKA
IKESHITA SHINJI
NAKANO HITOMI
SAKAI CHEMICAL INDUSTRY CO