Lubricating oil composition for refrigerators and compressors with the composition
First Claim
1. A lubricating oil composition/refrigerant combination, comprisinga refrigerant, which consists of a C2 to C3 unsaturated fluorinated hydrocarbon refrigerant, anda base oil consisting of a polyol ester compound in an amount of at least 50% by mass, wherein the polyol ester compound is obtained from a polyhydric alcohol selected from the group consisting of pentaerythritol, dipentaerythritol, trimethylolpropane and neopentyl glycol, and a C6 to C20 aliphatic monocarboxylic acid, wherein said polyol ester compound has an acid value of 0.02 mgKOH/g or less and a hydroxyl value of 5 mgKOH/g or less,wherein the base oil has a kinematic viscosity at 100°
- C. of 4 to 30 mm2/s and a molecular weight of 500 to 3000.
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Accused Products
Abstract
A lubricating oil composition for refrigerators comprising a base oil which comprises as a main component a polyol ester compound obtained from a polyhydric alcohol selected from among pentaerythritol, dipentaerythritol, trimethylolpropane, and neopentyl glycol and a C4 to C20 aliphatic monocarboxylic acid and which has an acid value of 0.02 mgKOH/g or less and a hydroxyl value of 5 mgKOH/g or less. A compressor using the lubricating composition. The lubricating oil composition is applicable to such refrigerators that use a refrigerant having a specific structure, such as an unsaturated fluorinated hydrocarbon compound, and being usable in current car air conditioner systems, and has excellent compatibility with the refrigerant, good sealing properties, capability of imparting a low coefficient of friction to sliding members and, yet, excellent stability. The compressor uses the lubricating composition.
17 Citations
17 Claims
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1. A lubricating oil composition/refrigerant combination, comprising
a refrigerant, which consists of a C2 to C3 unsaturated fluorinated hydrocarbon refrigerant, and a base oil consisting of a polyol ester compound in an amount of at least 50% by mass, wherein the polyol ester compound is obtained from a polyhydric alcohol selected from the group consisting of pentaerythritol, dipentaerythritol, trimethylolpropane and neopentyl glycol, and a C6 to C20 aliphatic monocarboxylic acid, wherein said polyol ester compound has an acid value of 0.02 mgKOH/g or less and a hydroxyl value of 5 mgKOH/g or less, wherein the base oil has a kinematic viscosity at 100° - C. of 4 to 30 mm2/s and a molecular weight of 500 to 3000.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
Specification