Lubricant composition

Patent metadata

Field	Value
Publication number	US-11739282-B2
Application number	US-202017440467-A
Country	US
Kind code	B2
Filing date	Mar 16, 2020
Priority date	Mar 20, 2019
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

Lubricant compositions comprising a base oil, one or more antioxidants selected from a group consisting of N-α-naphthyl-N-phenylamine antioxidants and diphenylamine antioxidants; and a sulfur-containing additive comprising up to seven carbon atoms exhibit outstanding oxidative stability and non-corrosion properties. The N-α-naphthyl-N-phenylamine antioxidants plus diphenylamine antioxidants in total may be present from about 0.2 wt % to about 0.8 wt %, based on the total weight of the lubricant composition. The sulfur provided by the sulfur-containing additive may be present from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition.

First claim

The invention claimed is:

1. A lubricant composition comprising
a base oil,
one or more antioxidants selected from a group consisting of N-α-naphthyl-N-phenylamine antioxidants and diphenylamine antioxidants; and
a sulfur-containing additive which is a mixture of sulfurized isobutylene compounds having from 1 to 5 sulfur atoms,
wherein the mixture of sulfurized isobutylene compounds comprises from about 2.5% to about 12.5% sulfurized isobutylene with one sulfur atom, about 32.5% to about 42.5% sulfurized isobutylene with two sulfur atoms, from about 30% to about 40% sulfurized isobutylene with three sulfur atoms, from about 5% to about 15% sulfurized isobutylene with four sulfur atoms, and from about 1% to about 11% sulfurized isobutylene with five sulfur atoms, and
wherein a total sulfur concentration provided by the sulfur-containing additive ranges from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition.

2. The lubricant composition according to claim 1 , wherein the N-α-naphthyl-N-phenylamine antioxidants plus diphenylamine antioxidants in total are present from about 0.2 wt % to about 0.8 wt %, based on the total weight of the lubricant composition.

3. The lubricant composition according to claim 1 , wherein the N-α-naphthyl-N-phenylamine antioxidants are of formula

wherein
R is H, C 1 -C 18 alkyl, C 2 -C 18 alkenyl, C 2 -C 18 alkynyl, —C(O)C 1 -C 18 alkyl or —C(O)aryl and
R 1 , R 2 , R 3 and R 4 are each independently H, C 1 -C 18 alkyl, C 1 -C 18 alkoxy, C 1 -C 18 alkylamino, C 1 -C 18 dialkylamino, C 1 -C 18 alkylthio, C 2 -C 18 alkenyl, C 2 -C 18 alkynyl or C 7 -C 21 aralkyl; and
wherein the diphenylamine antioxidants are of formula

wherein
R is H, C 1 -C 18 alkyl, C 2 -C 18 alkenyl, C 2 -C 18 alkynyl, —C(O)C 1 -C 18 alkyl or —C(O)aryl and R 1 , R 2 , R 3 and R 4 are each independently H, C 1 -C 18 alkyl, C 1 -C 18 alkoxy, C 1 -C 18 alkylamino, C 1 -C 18 dialkylamino, C 1 -C 18 alkylthio, C 2 -C 18 alkenyl, C 2 -C 18 alkynyl or C 7 -C 21 aralkyl.

4. The lubricant composition according to claim 1 , further comprising at least one additional sulfur-containing additive selected from a group consisting of sulfur-containing hindered phenolic compounds, sulfur-containing rust inhibitors, sulfur-containing friction modifiers and sulfur-containing antiwear additives.

5. The lubricant composition according to claim 1 , comprising one or more N-α-naphthyl-N-phenylamine antioxidants and one or more diphenylamine antioxidants and wherein a weight/weight ratio of N-α-naphthyl-N-phenylamine antioxidants to diphenylamine antioxidants is from about 1/9 to about 9/1.

6. The lubricant composition according to claim 1 , wherein the base oil is present from about 80 wt % to about 99.7 wt %, based on the total weight of the lubricant composition.

7. The lubricant composition according to claim 1 , wherein the composition is substantially free of zinc dialkyldithiophosphates.

8. An additive package comprising
a) one or more N-α-naphthyl-N-phenylamine antioxidants or b) one or more diphenylamine antioxidants; and
c) a sulfur-containing additive comprising up to 7 carbon atoms.

9. The additive package according to claim 8 , wherein c) is present from about 2 wt % to about 30 wt %, based on the total weight of a)+b)+c).

10. The additive package according to claim 8 , comprising a) and b) and wherein a weight/weight ratio of a) to b) is from about 1/1 to about 1/9.

11. An additive concentrate comprising the additive package according to claim 8 and a diluent selected from a group consisting of organic solvents, base stocks and liquid lubricant additives.

12. A process for preparing a lubricant composition, the process comprising incorporating one or more antioxidants selected from a group consisting of N-α-naphthyl-N-phenylamine antioxidants and diphenylamine antioxidants; and
a sulfur-containing additive which is a mixture of sulfurized isobutylene compounds having from 1 to 5 sulfur atoms into a base oil,
wherein the mixture of sulfurized isobutylene compounds comprises from about 2.5% to about 12.5% sulfurized isobutylene with one sulfur atom, about 32.5% to about 42.5% sulfurized isobutylene with two sulfur atoms, from about 30% to about 40% sulfurized isobutylene with three sulfur atoms, from about 5% to about 15% sulfurized isobutylene with four sulfur atoms, and from about 1% to about 11% sulfurized isobutylene with five sulfur atoms, and
wherein a total sulfur concentration provided by the sulfur-containing additive ranges from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition.

13. The process according to claim 12 , wherein the N-α-naphthyl-N-phenylamine antioxidants plus diphenylamine antioxidants in total are present from about 0.2 wt % to about 0.8 wt %, based on the total weight of the lubricant composition.

14. A process for lubricating a turbine or an engine, the process comprising adding the lubricant composition according to claim 1 to a turbine gearbox or to turbine bearings or to an engine.

Assignees

• Basf Se

Inventors

• Hoey Michael
• Chasan David Eliezer
• Schoonmaker Jeffrey
• Fenton Ryan James

Classifications

• C10M141/08 Primary

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

• C10M133/12 Primary

  having amino groups bound to a carbon atom of a six-membered aromatic ring · CPC title

• C10M135/04

  Hydrocarbons · CPC title

• C10M135/22

  containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms · CPC title

• C10M135/26

  containing carboxyl groups; Derivatives thereof · CPC title