Use of a hydrocarbyl-substituted salicylic acid detergent as an inhibitor of lead corrosion

Patent metadata

Field	Value
Publication number	US-10907111-B2
Application number	US-201515549142-A
Country	US
Kind code	B2
Filing date	Dec 17, 2015
Priority date	Feb 6, 2015
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

This invention relates to the use of a metallic or non-metallic detergent which is a hydrocarbyl-substituted salicylic acid or a derivative thereof in a non-aqueous lubricant composition as an inhibitor of lead corrosion associated with ashless, organic ester, anti-wear additives and/or friction modifiers.

First claim

The invention claimed is:

1. A method of improving anti-corrosion properties of a non-aqueous lubricant composition, the method comprising admixing (a) the non-aqueous lubricant composition comprising an ashless, organic ester, anti-wear additive and/or friction modifier with (b) a metallic or non-metallic detergent which is a C 10 -C 30 hydrocarbyl-substituted salicylic acid or a derivative thereof, the metallic or non-metallic detergent present in the non-aqueous lubricant composition in a concentration of between 2.5 and 8% by weight,
to produce the non-aqueous lubricant composition comprising said metallic or non-metallic detergent in an amount sufficient to pass Sequence VIII corrosion test according to ASTM D6709-13, wherein the non-aqueous lubricant composition comprising the ashless, organic ester, anti-wear additives and/or friction modifier without said metallic or non-metallic detergent fails Sequence VIII corrosion test according to ASTM D6709-13, wherein the ashless, organic ester, anti-wear additive and/or friction modifier is provided in a liquid fuel composition used to operate the internal combustion engine, and a portion of said ashless, organic ester, anti-wear and/or friction modifier ingresses into the non-aqueous lubricant composition during operation of said engine.

2. The method of claim 1 , wherein the non-aqueous lubricant composition is used to lubricate an internal combustion engine.

3. The method of claim 1 , wherein the C 10 -C 30 hydrocarbyl-substituted salicylic acid or a derivative thereof is a metallic C 10 -C 30 hydrocarbyl substituted salicylic acid or a derivative thereof.

4. The method of claim 3 , wherein the metal salt is selected from the group consisting of calcium, magnesium, sodium and combinations thereof.

5. The method of claim 1 , wherein the metallic or non-metallic detergent is a sulphurised derivative of the C 10 -C 30 hydrocarbyl-substituted salicylic acid.

6. The method of claim 1 wherein the ashless, organic ester, anti-wear additive and/or friction modifier is
i) at least one fatty acid ester of a polyol,
ii) at least one oil-soluble mono, di-, or tri-glyceride of at least one hydroxy polycarboxylic acid, or a derivative thereof;
iii) at least one long chain fatty acid ester of a hydroxy carboxylic acid in which the long chain fatty acid has at least 4 carbon atoms and the ester is an oil-soluble ester of a mono- or poly-hydroxy carboxylic acid containing 1 to 4 groups which are independently carboxylic acid groups or lower hydrocarbyl esters thereof and in which, when the hydroxy carboxylic acid is a mono-hydroxy carboxylic acid, the ester has a long chain fatty acid ester moiety of the hydroxy group of the hydroxy carboxylic acid and, when the hydroxy carboxylic acid is a poly-hydroxy carboxylic acid, the ester has independently long chain fatty acid ester moieties of one or two of the hydroxy groups of the poly-hydroxy carboxylic acid; or
iv) a mixture thereof.

7. The method of claim 6 , wherein the at least one fatty acid ester of a polyol is an ester of a fatty acid containing 12 to 24 carbon atoms.

8. The method of claim 6 , wherein the hydroxy polycarboxylic acid has at least one hydroxy group which is in an alpha position with respect to a carboxylic moiety.

9. The method of claim 8 , wherein the hydroxy polycarboxylic acid is citric acid.

10. The method of claim 6 , wherein the glyceride is a glyceride of citric acid and oleic acid, a glyceride of citric acid and linoleic acid or a mixture thereof.

11. The method of claim 6 , wherein the oil-soluble ester has at least one long chain fatty acid ester moiety in an alpha position with respect to a carboxylic acid group or lower hydrocarbyl ester thereof.

12. The method of claim 6 , wherein the oil-soluble ester is triethyl citrate butyrate, triethyl citrate oleate, triethyl citrate octanoate, triethyl citrate myristate, diethyl tartrate dibutyrate or diethyl tartrate dioleate.

13. The method of claim 1 , wherein the ashless, organic ester, anti-wear additives and/or friction modifier is present in the non-aqueous lubricant composition at a concentration of 0.1 wt % to 2.5 wt %.

14. The method of claim 1 , wherein the non-aqueous lubricant composition comprising the metallic or non-metallic detergent has maximum bearing loss of 26.4 mg as measured by Sequence VIII corrosion test according to ASTM D6709-13.

15. The method of claim 1 , wherein the metallic or non-metallic detergent is a C 16 -C 18 hydrocarbyl-substituted salicylic acid or a derivative thereof.

16. The method of claim 6 , wherein the at least one fatty acid ester of a polyol is glycerol mono-oleate, glycerol monostearate, glycerol monolaurate, glycerol dodecanoate or glycerol octadodecanoate.

17. The method of claim 1 , wherein the method improves anti-corrosion of lead, wherein the lead corrosion is associated with ashless, organic ester, anti-wear additive and/or friction modifier.

Assignees

• Castrol Ltd

Inventors

• Guiducci Aldo
• Lamb Gordon
• West Kevin

Classifications

• C10M141/08 Primary

  at least one of them being an organic sulfur-, selenium- or tellurium-containing compound · CPC title

• C10N2030/12

  Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives · CPC title

• C10M2203/1006

  used as base material · CPC title

• C10M163/00

  Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential · CPC title

• C10M129/02

  having a carbon chain of less than 30 atoms · CPC title