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Abstract

To provide a polyalkylene glycol-based refrigerant oil for refrigerators using ammonia as a refrigerant. The present invention provides a lubricant for refrigerators using ammonia refrigerant, comprising polyethers selected from the group consisting of a polyether represented by the following general formula (1) X--{--O--(AO).sub.n --H}.sub.p (1) (wherein X is a residue of a monool or polyol from which a hydroxyl group is eliminated; (AO).sub.n is a polyoxyalkylene group formed by copolymerization of EO and an AO having 3 or more carbon atoms; n is 2 or more; and p is a valence of X) and having 50% or more of secondary hydroxyl groups among the hydroxyl groups located at the terminal of the structure based on the total hydroxyl groups, or a polyether represented by the following general formula (2) X--{--O--(AO.sup.1).sub.a --(AO.sup.2).sub.b --H}.sub.p (2) (wherein X is a residue of a monool or polyol from which a hydroxyl group is eliminated; (AO.sup.1).sub.n is a polyoxyalkylene group formed by copolymerization of ethylene oxide and propylene oxide and/or butylene oxide; AO.sup.2 is an oxyalkylene group having 3 or more carbon atoms; a is 2 or more; b is 1 or more; and p is a valence of X).

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First Claim