Lubricant compositions with improved oxidation stability and service life

摘要

Provided are lubricants containing a synthetic ester, one or more additional base stocks and an additive package along with methods of making and using the same. Lubricant compositions comprise a synthetic ester that is a reaction product of at least one hindered organic polyol with one or more carboxylic acid where at least some (20%) up to 100% of the acids are branched. The lubricant compositions can provide improved oxidation stability and extended service life, as compared to a lubricant whose ester component is the reaction product of one or more hindered organic polyols and one or more carboxylic acids that are all linear, in applications that involve exposure to air, moisture, and/or high temperatures. These lubricant compositions are suited to a variety of lubricant applications, including, but not limited to air compressors, gear boxes, bearing sets, hydraulic systems, and chain drives.

主权项

1. A lubricant composition comprising:
10 to 35 wt. % of a synthetic ester base stock based on a total weight of the lubricant composition, wherein the synthetic ester base stock is a reaction product of a mixture comprising:
one or more hindered organic polyols, andone or more carboxylic acids with a chain length of at least five carbons,wherein 100 mole% of the one or more carboxylic acids are branched; 55 to 90 wt. % of a paraffinic Fischer-Tropsch derived-based fluid; optionally, at least one additional base stock; and a performance additive package comprising an antioxidant component,
wherein the antioxidant component is present in an amount of from 0.3 to 5 wt.% based on the total weight of the lubricant composition, andwherein the antioxidant component comprises an alkylated phenyl-naphthyl amine, phenyl-naphthyl amine, or combinations thereof.