Lubricant oils and greases containing nanoparticle additives
AssigneeSouthwest Research Institute
InventorJohn A. Waynick
Life of this patent
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Abstract
Lubricant oil and grease composition containing an additive package comprising wear-resistant additives in the form of nanoparticles, wherein the additives are a carbonate selected from the group consisting of a carbonate of a Group 1a alkali metal and a carbonate of a Group 2a alkaline earth metal, a sulfate of a Group 1a alkali metal or a Group 2a alkaline earth metal, a phosphate of a Group 1a alkali metal or Group 2a alkaline earth metal, a carboxylate of a Group 1a alkali metal and a carbonate of a Group 2a alkaline earth metal, or a combination thereof.
Claims5
A lubricant oil composition, comprising:
- a base oil present in said composition;
- an additive package comprising solid additives in the form of nanoparticles, the nanoparticles having a mean diameter in the range from 1 to 100 nanometers and present in an amount of 0.1% to 10% based on the total weight of the composition, wherein the nanoparticles comprise (a) a carbonate of a Group 2a alkaline earth metal, (b) a sulfate of a Group 2a alkaline earth metal, (c) a phosphate of a Group 2a alkaline earth metal, and (d) a carboxylate of a Group 2a alkaline earth metal, wherein the weight ratio of sulfate to carbonate is from about 1:1, the weight ratio of sulfate to phosphate is about 1:1, the weight ratio of sulfate to carboxylate is about 1:1 and the weight ratio of carboxylate to phosphate is about 1:1;
- and
- the nanoparticles further comprising an overbased metal phenate, an overbased metal sulfonate, or both and wherein said additive package is present in said base oil in an amount of 0.1% to 1.0% by weight;
- wherein the nanoparticles are permanently suspended in the lubricant oil composition;
- wherein the lubricant oil composition has a viscosity of about 40 Saybolt Universal Seconds at 100 degrees F.;
- wherein the lubricant oil composition is formulated as an engine oil for a gasoline internal combustion engine of an automobile;
- and
- wherein the sulfate, the phosphate and the carboxylate are reaction products of the carbonate.
A method of manufacturing a lubricant oil composition, comprising:
- combining and mixing a base oil present in said composition and an additive package comprising solid additives in the form of nanoparticles, the nanoparticles having a mean diameter in the range from 1 to 100 nanometers and present in an amount of 0.1% to 10% based on the total weight of the composition, wherein the nanoparticles comprise (a) a carbonate of a Group 2a alkaline earth metal, (b) a sulfate of Group 2a alkaline earth metal, (c) a phosphate of a Group 2a alkaline earth metal, and (d) a carboxylate of a Group 2a alkaline earth metal, wherein the weight ratio of sulfate to carbonate is from about 1:1, the weight ratio of sulfate to phosphate is about 1:1, the weight ratio of sulfate to carboxylate is about 1:1 and the weight ratio of carboxylate to phosphate is about 1:1;
- and
- the nanoparticles further comprising an overbased metal phenate, an overbased metal sulfonate, or both and wherein said additive package is present in said base oil in an amount of 0.1% to 1.0% by weight;
- wherein the nanoparticles are permanently suspended in the lubricant oil composition;
- wherein the lubricant oil composition has a viscosity of about 40 Saybolt Universal Seconds at 100 degrees F.;
- wherein the lubricant oil composition is formulated as an engine oil for a gasoline internal combustion engine of an automobile;
- and
- wherein the sulfate, the phosphate and the carboxylate are reaction products of the carbonate.
Dependencies are inferred from the claim text.