Lubricant composition for gas turbines
AssigneeTotalenergies Onetech
InventorsFrédéric Michel, Florence Bredon
Life of this patent
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Abstract
The present invention relates to a lubricant composition, in particular for a gas or steam turbine, comprising: —at least one base oil; —at least one phenylnaphthylamine (PAN) compound, preferably alkylphenyl-α-naphthylamine (APAN) compound; —at least one diphenylamine (DPA) compound, preferably dialkyl-diphenylamine compound; and —at least one phosphite ester compound, preferably triaryl phosphite ester compound; in which the ratio by weight between said diphenylamine compound(s) and said phosphite ester compound(s) is strictly greater than 1.0.
Claims8
A composition for lubricating a gas or steam turbine, comprising, based on a total weight of the composition:
- from 70% to 99% by weight of at least one base oil;
- from 0.2% to 0.5% by weight of at least one alkylphenyl-α-naphthylamine compound;
- from 0.2% to 0.5% by weight of at least one dialkyldiphenylamine compound;
- and
- from 0.1% to 0.3% by weight of at least one triaryl phosphite ester chosen from compounds of formula (III-a):
- wherein:
- each R is independently chosen from a linear or branched, C1 to C10 alkyl group;
- and
- each n is independently chosen from 1 or 2;
- and
- wherein the composition has a dialkyldiphenylamine compound to phosphite ester compound mass ratio of greater than 1.5, and
- wherein the composition comprises 200 ppm or less of phosphate ester anti-wear and/or extreme pressure additives.
A method for lubricating a gas or steam turbine comprising applying to the gas or steam turbine a composition comprising, based on a total weight of the composition:
- from 70% to 99% by weight of at least one base oil;
- from 0.2% to 0.5% by weight of at least one alkylphenyl-α-naphthylamine compound;
- from 0.2% to 0.5% by weight of at least one dialkyldiphenylamine compound;
- and
- from 0.1% to 0.3% by weight of at least one phosphite ester chosen from compounds of formula (III-a):
- wherein:
- each R is independently chosen from a linear or branched, C1 to C10 alkyl group;
- and
- each n is independently chosen from 1 or 2;
- and
- wherein the composition has a dialkyldiphenylamine compound to phosphite ester compound mass ratio of greater than 1.5, and
- wherein the composition comprises 200 ppm or less of phosphate ester anti-wear and/or extreme pressure additives.
Dependencies are inferred from the claim text.