Low sulfur and low metal additive formulations for high performance industrial oils
AssigneeExxonMobil Research and Engineering Company
InventorsJames T. Carey, Angela S. Galiano-Roth, Margaret M. Wu, Heather M. Haigh
Life of this patent
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Abstract
An additive package, lubricant formulation with the additive package and method of improving gear lubricant properties with the additive package are disclosed. The additive package comprises at least one antiwear additive, at least one antioxidant additive, at least one rust inhibitor additive, at least one metal passivator additive, at least one demulsifier additive, at least one defoamant additive wherein the composition has less than 3.5% phosphorous, less than 1.7% ppm nitrogen, less than 1000 ppm sulfur, less than 100 ppm metals and a TAN of less than 1.
Claims11
A gear and bearing oil, comprising
- a) at least three base stocks;
- b) a first PAO base stock with a viscosity at least 100 cSt, Kv100° C.;
- c) a second base stock comprising a oil with a viscosity less than 40 cSt, Kv100° C.;
- d) a third basestock comprising a co-base oil selected from the group consisting of a PAO with a viscosity of at least 1.5 cSt, Kv100° C. and no more than 100 cSt, Kv100° C, a Group V base stock including ester base stock, alkylated aromatic and any combination thereof;
- e) an additive package comprising at least one antiwear additive, at least one antioxidant additive, at least one rust inhibitor additive, at least one metal passivator additive, at least one demulsifier additive, at least one defoamant additive with the proviso that the additive package does not include any sulfur containing and any metallic containing additives;
- wherein the antiwear additive is at least 0.05 and less than 1 weight percent of the final formulation the antioxidant additive is at least 0.05 and less than 0.5 weight percent of the final formulation, the rust inhibitor additive is at least 0.05 and less than 0.5 weight percent of the final formulation, the metal passivator additive is at least 0.01 and less than 0.5weight percent of the final formulation, the demulsifier additive is at least 0.05 and less than 1 weight percent of the final formulation, and the defoamant additive is at least 0.005 and less than 1 weight percent of the final formulation;
- f) wherein the gear and bearing oil has less than 1000 ppm phosphorous, less than 500 ppm nitrogen, less than 10 ppm metals, less than 30 ppm sulfur and a TAN of less than 1.
A method of obtaining favorable gear and bearing oil properties, comprising;
- a) obtaining a first PAO base stock having a viscosity greater than 100 cSt, Kv100° C and having a molecular weight distribution (MWD) as a function of viscosity at least 10 percent less than algorithm
- MWD=0.2223+1.0232*log (Kv at 100° C in cSt);
- b) obtaining a second base stock lubricant, the second base stock lubricant has a viscosity less than 40 cSt, Kv100° C;
- c) obtaining an additive package comprising at least one antiwear additive, at least one antioxidant additive, at least one rust inhibitor additive, at least one metal passivator additive, at least one demulsifier additive, at least one defoamant additive with the proviso that the additive package does not include any sulfur containing and any metallic containing additives;
- wherein the antiwear additive is at least 0.05 and less than 1 weight percent of the final formulation, the antioxidant additive is at least 0.05 and less than 0.5 weight percent of the final formulation, the rust inhibitor additive is at least 0.05 and less than 0.5 weight percent of the final formulation, the metal passivator additive is at least 0.01 and less than 0.5weight percent of the final formulation, the demulsifier additive is at least 0.05 and less than 1 weight percent of the final formulation, and the defoamant additive is at least 0.005 and less than 1 weight percent of the final formulation;
- d) blending the first base stock, the second base stock and additive package to produce a gear and bearing oil wherein the gear and bearing oil has less than 1000 ppm phosphorous, less than 500 ppm nitrogen, less than 10 ppm metals, less than 30 ppm sulfur and a TAN of less than 1.
Dependencies are inferred from the claim text.