Lubricating Oil Composition And Method Of Using The Lubricating Oil Composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsBrittany WATLING, Shizuka AGANO
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Abstract
Provided is a lubricating oil composition, which is excellent in passability through a water-containing stratum, and is also excellent in evaporation-suppressing property and coking resistance. The lubricating oil composition is a lubricating oil composition, including: a polyalkylene glycol compound (A); a naphthylamine-based antioxidant (B); and a diphenylamine-based antioxidant (C), wherein a molar ratio [(EO)/(RO)] of an oxyethylene unit (EO) to an oxyalkylene unit (RO) except the oxyethylene unit (EO) in the polyalkylene glycol compound (A) is 1.0 or more, and wherein a content of the polyalkylene glycol compound (A) is more than 50 mass % with respect to a total amount of the lubricating oil composition.
Claims11
A lubricating oil composition, comprising:
- a polyalkylene glycol compound (A);
- a naphthylamine-based antioxidant (B);
- and
- a diphenylamine-based antioxidant (C),
- wherein a molar ratio [(EO)/(RO)] of an oxyethylene unit (EO) to an oxyalkylene unit (RO) except the oxyethylene unit (EO) in the polyalkylene glycol compound (A) is 1.2 or more,
- a content of the polyalkylene glycol compound (A) is more than 50 mass % with respect to a total amount of the lubricating oil composition,
- an alkylene group R of the oxyalkylene unit (RO) is an alkylene group having 3 to 5 carbon atoms,
- a total content of the naphthylamine-based antioxidant (B) and the diphenylamine-based antioxidant (C) is from 0.5 mass % to 6.0 mass % with respect to the total amount of the lubricating oil composition, and
- a content ratio [(C)/(B)] of the diphenylamine-based antioxidant (C) to the naphthylamine-based antioxidant (B) is from 0.3 to 3.0 in terms of mass ratio.
2-6. (canceled)
A lubricating method of using a lubricating oil composition, comprising using the lubricating oil composition in lubrication of a compressor,
- wherein the compressor is a reciprocating compressor to be used when carbon dioxide is pressed into a ground in a carbon dioxide capture and storage technology,
- the lubricating oil composition includes:
- a polyalkylene glycol compound (A);
- a naphthylamine-based antioxidant (B);
- and
- a diphenylamine-based antioxidant (C),
- a molar ratio [(EO)/(RO)] of an oxyethylene unit (EO) to an oxyalkylene unit (RO) except the oxyethylene unit (EO) in the polyalkylene glycol compound (A) is 1.0 or more, and
- a content of the polyalkylene glycol compound (A) is more than 50 mass % with respect to a total amount of the lubricating oil composition.
(canceled)
Dependencies are inferred from the claim text.