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US 12,378,494 B2Granted
Corrosion inhibitor and industrial lubricant including the same
AssigneeAfton Chemical Corporation
InventorsDavid Edwards, Helen Ryan, Robert Mccovick
Life of this patent
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Abstract
Disclosed herein are corrosion inhibitors suitable for heavy-duty industrial lubricants and industrial lubricating compositions including such corrosion inhibitors combined with phosphonate diesters to provide good copper corrosion and roller bearing protection. The corrosion inhibitor has a high content of dialkyl dithiothiadiazole compounds configured to maintain high levels of the phosphonate diester in the lubricant.
Claims21
A corrosion inhibitor made by a process comprising:
- (a) reacting a 1,3,4-dimercapto thiadiazole or alkali metal salt thereof with an alkyl mercaptan in the presence of an acid to form a first reaction intermediate;
- (b) reacting the first reaction intermediate with hydrogen peroxide to form the corrosion inhibitor;
- and
- (c) wherein the 1,3,4-dimercapto thiadiazole or alkali metal salt thereof, the alkyl mercaptan, and the hydrogen peroxide are provided at a molar ratio of 1:1.95-2.15:2.1-2.4.
1 more element
A lubricant comprising:
- (a) a majority of base oil;
- and
- (b) a corrosion inhibitor made by a process comprising:
- (i) reacting a 1,3,4-dimercapto thiadiazole or alkali metal salt thereof with an alkyl mercaptan in the presence of an acid to form a first reaction intermediate;
- (ii) reacting the first reaction intermediate with hydrogen peroxide to form the corrosion inhibitor;
- and
- (iii) wherein the 1,3,4-dimercapto thiadiazole or alkali metal salt thereof, the alkyl mercaptan, and the hydrogen peroxide are provided at a molar ratio of 1:1.95-2.15:2.1-2.4.
4 more elements
A corrosion inhibitor additive comprising:
- (a) about 95 mol percent or more of a 2,5-dialkyl-dithiothiadiazole compound;
- (b) a monoalkyl-dithiothiadiazole compound, but no more than about 5 mol percent of the monoalkyl-dithiothiadaizole compound;
- and
- (c) wherein the total acid number of the corrosion inhibitor additive is about 10 or less;
- and
- wherein the corrosion inhibitor is obtained from a dimercapto thiadiazole or alkali metal salt thereof, an alkyl mercaptan, and a hydrogen peroxide provided at a molar ratio of 1:1.95-2.15:2.1-2.4.
3 more elements
Dependencies are inferred from the claim text.