Lubricating composition and method for preparing same
A composition made by admixing a major amount of base oils of lubricating viscosity and minor amounts of additives. The additives can include a viscosity modifier, a dispersant, a friction modifier, an anti-oxidant, a suppressant, a tackifier, and thickeners. The dispersant can be a dissolved powered styrene-ethylene/propylene-block copolymer and the thickeners can be fumed silicia. The dispersants and the thickeners are pulverized and dissolved in the composition to provide for inhibition of oil separation during storage.
1. A composition comprising, or made by admixing: a major amount of: base oils of lubricating viscosity; and minor amounts of a viscosity modifier, a dispersant, a friction modifier, an anti-oxidant, a suppressant, a tackifier, and thickeners, the dispersant is a powered styrene-ethylene/propylene-block copolymer and the thickeners are (a) a hydrophobic fumed silica and (b) a hydrophilic fumed silica, the dispersants and the thickeners are pulverized and dissolved in the composition to provide for inhibition of oil separation during storage.
2. The composition of claim 1 wherein the base oils are mineral oil and polyalphaolefin (PAO) oil.
3. The composition of claim 2 wherein the suppressant is polyethylene glycol.
4. The composition of claim 3 wherein the viscosity modifier is polyalkyl methacrylate.
5. The composition of claim 4 wherein the tackifier is polyisobutylene dissolved in a selected paraffinic-based stock.
6. The composition of claim 5 wherein the friction modifier is polytetrafluoroethylene.
7. The composition of claim 6 wherein the antioxidant is a phenolic antioxidant.
8. A process for making a composition comprising the steps of: adding a viscosity modifier to a kettle; adding a first base oil to the kettle; mixing the composition with an anchor blade and a disperser blade; adding a second base oil; increasing a speed of the disperser blade; adding an antioxidant and a friction modifier; creating a vacuum within the kettle through the use of a rotor/stator assembly; adding a dispersant through a vacuum wand, the vacuum rand allows the dispersant to be introduced directly into the rotor/stator assembly so that the dispersant is pulverized, discharged and dissolved under the surface of the oil; reducing a speed of the rotor/stator assembly; adding thickeners through the vacuum wand, the thickeners are (a) a hydrophobic fumed silica and (b) a hydrophilic fumed silica, the vacuum wand allows the thickeners to be introduced directly into the rotor/stator assembly so that the thickeners are pulverized, discharged and dissolved under the surface of the oil; shutting down the rotor/stator; adding a tackifier and a suppressant through a cover port; and creating a vacuum with the rotor/stator assembly to eliminate air from the composition.
9. The process of claim 8 wherein the first base oil is mineral oil and the second base oil is a polyalphaolefin (PAO) oil.
10. The process of claim 9 wherein t le dispersant is a powered styrene-ethylene/propylene-block copolymer.
11. The process of claim 10 wherein the hydro fumed silica is fumed silica aftertreated with Dimethyldichlorosilane and the hydrophilic fumed silica has a specific surface area of 200 m2/g.
12. The process of claim 11 wherein the suppressant is polyethylene glycol.
13. The process of claim 12 wherein the viscosity modifier is polyalkyl methacrylate.
14. The process of claim 13 wherein the tackifier is polyisobutylene dissolved in a selected paraffinic-based stock.
15. The process of claim 14 wherein the friction modifier is polytetrafluoroethylene.
16. The process of claim 15 wherein the antioxidant is a phenolic antioxidant.
17. A lubricating formulation prepared from a blend of components comprised of: 35-55% mineral oil; 30-50% PAO oil; 0.5-5% powered styrene-ethylene/propylene-block copolymer; 0.5-5% of a fumed silica aftertreated with Dimethyldichlorosilane; and 1-10% of a hydrophilic fumed silica with a specific surface area of 200 m2/g, wherein the powered styrene-ethylene/propylene-block copolymer, fumed silica aftertreated with Dimethyldichlorosilane and the hydrophilic fumed silica with a specific surface area of 200 m2/g are introduced directly into a rotor/stator so that the powered styrene-ethylene/propylene-block copolymer, fumed silica aftertreated with Dimethyldichlorosilane and the hydrophilic fumed silica with a specific surface area of 200 m2/g are pulverized, discharged and dissolved under a surface the blend during formulation.
18. The lubricating formulation prepared from a blend of components as claimed in claim 17 further comprised of 0.1-2% of polyethylene glycbl.
19. The lubricating formulation prepared from a blend of components as claimed in claim 18 further comprised of 0.1-2% polyalkyl methacrylate.
20. The lubricating formulation prepared from a blend of components as claimed in claim 19 further comprised of 0.1-2% polyisobutylene dissolved in a selected paraffinic-based stock.
21. The lubricating formulation prepared from a blend of components as claimed in claim 20 further comprised of 0.5-5% polytetrafluoroethylene.
22. The lubricating formulation prepared from a blend of components as claimed in claim 21 further comprised of 0.1-2% of a phenolic antioxidant.
23. The composition of claim 1 wherein the hydrophobic fumed silica is fumed silica aftertreated with Dimethyldichlorosilane and the hydrophilic fumed silica has a specific surface area of 200 m2/g.