Corrosion Inhibiting Polyalkylene Glycol-Based Lubricant Compositions
AssigneeDow Global Technologies LLC
InventorsMartin R. Greaves, Daniel Zweifel, Evelyn A. Zaugg-Hoozemans
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Abstract
Lubricant compositions including a random or block copolymer first high-EO content polyalkylene glycol, a random copolymer second polyalkylene glycol based on propylene oxide and butylene oxide or a second polyalkylene homopolymer having propylene oxide or butylenes oxide units and at least one corrosion inhibitor selected from the group of sarcosines, amine phosphates, and calcium dinonylnaphthalenesulfonate/carboxylates are provided. Lubricant compositions for extreme conditions are also provided.
Claims18
A lubricant composition comprising:
- a random or block copolymer first polyalkylene glycol based on ethylene oxide and propylene oxide, wherein at least 30 percent by weight of the polyalkylene glycol is ethylene oxide units;
- an effective amount of a random copolymer second polyalkylene glycol based on propylene oxide and butylene oxide, wherein at least 50 percent by weight of the second polyalkylene glycol is butylene oxide units or an effective amount of a second polyalkylene homopolymer having propylene oxide or butylene oxide units;
- and
- an effective amount of at least one corrosion inhibitor selected from the group of sarcosines, amine phosphates, and calcium dinonylnaphthalenesulfonate/carboxylates.
Any one of the preceding claims wherein the effective amount of the corrosion inhibitor is between 0.25 and 1.5 wt %.
Any one of the preceding claims wherein the second polyalkylene glycol comprises between 50 and 75 wt % butylene oxide units.
Any one of the preceding claims wherein the first polyalkylene glycol has a kinematic viscosity at 40° C. between 30 and 250 mm2/s (cSt).
Any one of the preceding claims wherein the lubricant composition is capable of passing ASTM D665B for at least 24 hours after initiation.
A lubricant composition for use in extreme conditions comprising:
- a random or block copolymer polyalkylene glycol based on ethylene oxide and propylene oxide having a molecular weight greater than 2,000 g/mole and wherein at least 30 wt % of the copolymer polyalkylene glycol is ethylene oxide units;
- 10-20 wt % of a polyalkylene homopolymer having propylene oxide or butylene oxide units having a molecular weight between 400 and 1500 g/mole;
- and
- at least one corrosion inhibitor selected from the group consisting of (a) an amine salt of an aliphatic phosphoric acid ester;
- (b) an alkenyl succinic acid half ester in mineral oil;
- (c) an amine salt of an alkyl phosphoric acid combined with a dithiophosphoric acid derivative;
- (d) a combination of barium dinonylnaphthalene sulfonate and dinonylnaphthalene carboxylate in a hydrotreated naphthenic oil;
- and (e) combinations thereof.
Any one of the preceding claims wherein the lubricant composition is capable of passing ASTM 665B for at least 4 hours after initiation.
Dependencies are inferred from the claim text.