Lubricant composition

Patent metadata

Field	Value
Publication number	US-12215294-B2
Application number	US-201916359124-A
Country	US
Kind code	B2
Filing date	Mar 20, 2019
Priority date	Mar 20, 2018
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

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 one or more sulfur-containing additives 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 additives, in total, may be present from about 50 ppm to about 1000 ppm by weight, based on the total weight of the lubricant composition.

First claim

What is claimed is:

1. A lubricant composition comprising
a base oil,
about 0.2 wt % to about 0.8 wt % of one or more N-α-naphthyl-N-phenylamine antioxidants and one or more diphenylamine antioxidants, in total, based on the total weight of the lubricant composition, wherein the one or more N-α-naphthyl-N-phenylamine antioxidants are of formula

wherein
R is 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;
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 with the proviso that when R is C 3 alkenyl, R 2 or R 3 is not hydrogen; and
one or more sulfur-containing additives comprising one or more di-tert-alkyl polysulfides in an effective amount to provide a sulfur concentration, in total, ranging 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 a weight/weight ratio of the N-α-naphthyl-N-phenylamine antioxidants to diphenylamine antioxidants is from about 1/9 to about 9/1.

3. The lubricant composition according claim 1 ,
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 ,
wherein the diphenylamine antioxidants are of formula

wherein R 1 and R 2 are each independently H, C 1 -C 18 alkyl, C 2 -C 18 alkenyl or C 7 -C 21 aralkyl.

5. The lubricant composition according to claim 1 ,
wherein the diphenylamine antioxidants are of formula

wherein R 1 and R 2 are each independently H, tert-butyl, tert-octyl or branched nonyl.

6. The lubricant composition according to claim 1 , wherein the one or more sulfur-containing additives further comprise a 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.

7. The lubricant composition according to claim 1 , further comprising one or more sulfur-containing additives selected from a group consisting of 2,4-di-octylthiomethyl-6-tert-butylphenol, 2,4-di-octylthiomethyl-6-methylphenol, 2,4-di-octylthiomethyl-6-ethylphenol or 2,6-di-dodecylthiomethyl-4-nonylphenol, 2,2′-thiobis(6-tert-butyl-4-methylphenol), 2,2′-thiobis(4-octylphenol), 4,4′-thiobis(6-tert-butyl-3-methylphenol), 4,4′-thiobis-(6-tert-butyl-2-methylphenol), 4,4′-thiobis(3,6-di-sec-amylphenol), 4,4′-bis(2,6-dimethyl-4-hydroxyphenyl)disulfide, octadecyl 4-hydroxy-3,5-dimethylbenzylmercaptoacetate, tridecyl 4-hydroxy-3,5-di-tert-butylbenzylmercaptoacetate, bis(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithioterephthalate, bis(3,5-di-tert-butyl-4-hydroxybenzyl) sulfide, isooctyl 3,5-di-tert-butyl-4-hydroxy-benzylmercaptoacetate and esters of β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, β-(5-tert-butyl-4-hydroxy-3-methylphenyl) propionic acid, β-(3,5-dicyclohexyl-4-hydroxyphenyl)-propionic acid, 3,5-di-tert-butyl-4-hydroxyphenylacetic acid or β-(5-tert-butyl-4-hydroxyphenyl)-3-thiabutyric acid with thiodiethylene glycol, 3-thiaundecanol or thiapentadecanol.

8. The lubricant composition according to claim 1 , further comprising one or more sulfur-containing additives selected from a group consisting of organomolybdenum dithiocarbamates, organomolybdenum dithiophosphates and organomolybdenum compounds based on dispersants and molybdenum disulfide.

9. The lubricant composition according to claim 1 , further comprising one or more sulfur-containing additives selected from a group consisting of sulfurized olefins, sulfurized vegetable oils, dialkyldithiophosphate esters, zinc dialkyldithiophosphates, alkyl or aryl di- or tri-sulfides, derivatives of 2,5-dimercapto-1,3,4-thiadiazole, ethyl(bisisopropyloxyphosphinothioyl)-thiopropionate, triphenyl thiophosphate, tris(alkylphenyl)phosphorothioates, diphenylmonononylphenyl phosphorothioate, isobutylphenyl diphenyl phosphorothioate, a dodecylamine salt of 3-hydroxy-1,3-thiaphosphetan 3-oxide, trithiophosphoric acid 5,5,5-tris-isooctyl 2-acetate, derivatives of 2-mercaptobenzothiazole, ethoxycarbonyl 5-octyldithiocarbamate and dihydrocarbyl dithiophosphate metal salts.

10. The lubricant composition according to claim 1 , further comprising one or more sulfur-containing additives selected from a group consisting of sulfurized olefins.

11. The lubricant composition according to claim 1 , further comprising one or more sulfur-containing additives selected from a group consisting of sulfurized isobutylene.

12. The lubricant composition according to claim 1 , comprising one or more sulfur-containing additives selected from a group consisting of di-tert-butyl polysulfide, di-tert-dodecyl polysulfide, di-tert-nonyl polysulfide, and a mixture thereof.

13. The lubricant composition according to claim 1 , wherein a weight/weight ratio of N-α-naphthyl-N-phenylamine antioxidants to diphenylamine antioxidants is from about 1/1 to about 9/1.

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

15. An additive package comprising:
a) one or more N-α-naphthyl-N-phenylamine antioxidants, wherein the one or more N-α-naphthyl-N-phenylamine antioxidants are of formula

wherein
R is 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;
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 with the proviso that when R is C 3 alkenyl, R 2 or R 3 is not hydrogen; or

b) one or more diphenylamine antioxidants; or
both a) and b); and
c) one or more sulfur-containing additives comprising one or more di-tert-alkyl polysulfides,
wherein a weight/weight ratio of a) to b) is from about 1/1 to about 1/9, and
wherein c) is present from about 2 wt % to about 30 wt %, based on the total weight of a)+b)+c).

16. A process for preparing a lubricant composition, the process comprising: incorporating
one or more N-α-naphthyl-N-phenylamine antioxidants and one or more diphenylamine antioxidants; and
one or more sulfur-containing additives comprising one or more di-tert-alkyl polysulfides in an effective amount to provide for a sulfur concentration, in total, of from about 50 ppm to about 1000 ppm by weight, based on the total

Assignees

• Basf Se

Inventors

• Hoey Michael D
• Chasan David
• Schoonmaker Jeffrey
• Fenton Ryan

Classifications

• C10N2060/10

  by sulfur or a compound containing sulfur · CPC title

• C10N2040/135

  Steam engines or turbines · CPC title

• C10N2040/02

  Bearings · CPC title

• C10N2030/12

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

• C10N2030/10

  Inhibition of oxidation, e.g. anti-oxidants · CPC title