To provide a lubricant which is excellent in the compatibility with ammonia and also has excellent practical performance such as good stability and lubricity.
A lubricant for a refrigerator using ammonia as the refrigerant, which contains an additive selected from antioxidant, anti-wear additive and metal deactivator, and the polyether compound represented by the following general formula (1) or (2):
X{—O—(AO)
n
—H}
p
(1)
X{—O—(AO
1
)
a
—(AO
2
)
b
—H}
p
(2)
[wherein X represents a residue resulting from removing a hydroxyl group from a monool or a polyol, (AO)
n
represents a polyoxy alkylene chain constituted by the copolymerization of EO and an alkylene oxide having 3 or more carbon atoms, and the number of the secondary hydroxyl groups from among the terminal hydroxyl groups is
50
% or more of the total number of the hydroxyl groups. (AO
1
)
a
represents a polyoxy alkylene chain constituted by the copolymerization of EO and PO and/or BO, and AO
2
represents an oxyalkylene group having 3 or more carbon atoms].
提供一种与
氨具有良好兼容性的润滑剂,该润滑剂还具有良好的稳定性和润滑性等优异的实用性能。
一种用于使用
氨作为制冷剂的冰箱的润滑剂,它含有一种选自
抗氧化剂、抗磨损添加剂和
金属失活剂的添加剂,以及由以下通式(1)或(2)表示的聚醚化合物:
X{-O-(AO)
n
-H}
p
(1)
X{-O-(AO
1
)
a
-(AO
2
)
b
-H}
p
(2)
其中 X 代表从一元醇或多元醇中去除羟基后的残留物,(AO)
n
代表由
EO 和具有 3 个或更多碳原子的氧化亚烷共聚而成的聚氧亚烷基链,且末端羟基中的仲羟基数目为
50
或更多。(AO
1
)
a
代表由
EO 和 PO 及/或 BO 共聚而成的聚氧亚烷基链,而 AO
2
代表具有 3 个或更多碳原子的氧亚烷基]。