Refrigerator oil composition containing phosphate ester additives for fluoroalkane refrigerant

摘要

A refrigerator oil composition for a fluoroalkane refrigerant comprises a base oil composed principally of at least one oxygen-containing compound and, based on the total weight of the composition, [I] 0.5-5.0 wt. % of a phosphate ester represented by the formula (A), and [II] (a) 0.1-5.0 wt. % of a halogenated phosphate ester represented by the formula (B) and/or (b) 0.01-2.0 wt. % of an acid phosphate ester represented by the formula (C), an amine salt thereof or a combination of both the acid phosphate ester and the amine salt. <IMAGE> (A) <IMAGE> (B) <IMAGE> (C) wherein R1, R2 and R3 represent a C1-18 hydrocarbon or oxygen-containing hydrocarbon group; R4, R5 and R6 represent a C1-18 hydrocarbon or oxygen-containing hydrocarbon group or a group similar to the C1-18 hydrocarbon or oxygen-containing hydrocarbon groups except for the substitution of at least one of the hydrogen atoms by a corresponding number of halogen atom or atoms with the proviso that the total number of halogen atoms contained in R4, R5 and R6 is 1-9; and R7 and R8 represent a hydrogen atom, a C1-18 hydrocarbon or oxygen-containing hydrocarbon group.