Refrigerating machine oil composition for carbon dioxide refrigerant
AssigneeIdemitsu Kosan Co., Ltd.
InventorToshinori Tazaki
Life of this patent
Estimating the term…
Abstract
The invention relates to a refrigerator oil composition for compression refrigerators with carbon dioxide refrigerant therein, such as car air conditioners, refrigerators, freezers, air conditioners, heat pumps, etc. The base oil of the composition comprises an oxygen-containing organic compound as the essential component and has a kinematic viscosity at 100° C. of from 5 to 50 mm2/sec, a viscosity index of at least 60, and a water content of at most 300 ppm.
Claims12
A refrigerator oil composition for carbon dioxide refrigerant, the refrigerator oil composition comprising a base oil and an acid scavenger, wherein
- the base oil comprises an oxygen-containing organic compound and has a kinematic viscosity at 100° C. of from 5 to 50 mm2/ sec, a viscosity index of at least 60, and a water content of at most 300 ppm;
- the oxygen-containing organic compound is one or more selected from polyoxyalkylene glycols, polyvinyl ethers and carbonates;
- the acid scavenger is one or more selected from
- alkyl glycidyl ethers each comprising an alkyl group containing between 3 and 30 carbon atoms,
- alkylene glycol glycidyl ethers each comprising an alkylene group containing between 3 and 30 carbon atoms, and
- α-olefin oxides each containing between 4 and 30 carbon atoms;
- and
- the acid scavenger content of the refrigerator oil composition falls between 0.005 and 5% by weight relative to the base oil.
A method of using a refrigerator oil composition, the method comprising
- lubricating a refrigerator with a mixture comprising a carbon-dioxide-based refrigerant and a refrigerator oil composition, wherein
- the ratio of the carbon-dioxide-based refrigerant to the refrigerator oil composition is in a range of from 99/1 to 10/90 by weight;
- and
- the refrigerator oil composition comprises a base oil and an acid scavenger, where
- the base oil comprises an oxygen-containing organic compound and has a kinematic viscosity at 100° C. of from 5 to 50 mm2/ sec, a viscosity index of at least 60, and a water content of at most 300 ppm;
- the oxygen-containing organic compound is one or more selected from polyoxyalkylene glycols, polyvinyl ethers and carbonates;
- the acid scavenger is one or more selected from
- phenyl glycidyl ethers,
- alkyl glycidyl ethers each comprising an alkyl group containing between 3 and 30 carbon atoms,
- alkylene glycol glycidyl ethers each comprising an alkylene group containing between 3 and 30 carbon atoms,
- cyclohexene oxides, and
- α-olefin oxides each containing between 4 and 30 carbon atoms;
- and
- the acid scavenger content of the refrigerator oil composition falls between 0.005 and 5% by weight relative to the base oil.
Dependencies are inferred from the claim text.