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Method of Lubricating an Internal Combustion Engine

a technology of internal combustion engine and lubricating method, which is applied in the direction of lubricant composition, fuel, mixing, etc., can solve the problems of detergents delivering limited tbn, corrosive acids form during combustion, and sludge and other deposits

Inactive Publication Date: 2011-06-23
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method of lubricating an internal combustion engine using a dispersion containing a metal base, a surfactant, and an organic medium. The metal base has a small particle size of 10 nanometres to 1 μm and the dispersion has a high solids content of 15 wt % or higher. The dispersion is combined with an oil of lubricating viscosity and other performance additives to create a lubricant composition. The technical effect of this invention is to provide a stable and effective lubricant for internal combustion engines that improves fuel efficiency and reduces emissions.

Problems solved by technology

Whilst the engine is operating, corrosive acids form during combustion along with sludge and other deposits.
Further conventional detergents deliver a limited TBN relative to treat rate.

Method used

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  • Method of Lubricating an Internal Combustion Engine

Examples

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Preparative Examples of Dispersions

[0082]A series of dispersions containing a metal base, an organic medium and a surfactant are prepared from a slurry comprising 40 wt % to 50 wt % of the metal base, 6 wt % to 15 wt % of a surfactant and the remained a hydrocarbon fluid, typically solvent neutral 100 mineral oil. 2 kg to 5 tonnes of the slurry is milled in a horizontal bead mill with a milling chamber of suitable size appropriate for the scale of the operation. The bead size filling the chamber (typically 65 vol. %) is typically in the range 0.7 mm to 0.1 mm diameter (e.g. 0.3 mm+ / −0.05 mm beads). After a suitable amount of milling, typically 4 to 20 minutes residence time (i.e. the actual time the dispersion spends in the mill) the required particle size is achieved (i.e. ≦1 μm) as determined by Coulter® LS230 Particle Size Analyser. The dispersion is easy to pour and stable for several weeks between −20° C. and +60° C., showing no tendency to stratify or to form a gel. The prepar...

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PUM

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Abstract

The invention provides a method of lubricating an internal combustion engine comprising supplying to said engine a dispersion, the dispersion comprises: (a) a metal base; (b) a surfactant; and (c) an organic medium in which the metal base is uniformly dispersed by physical processes, wherein the metal base has a mean average particle size of at least 10 nanometres to less than 1 μm; and the dispersion has a solids content of greater than 15 wt %. The invention further provides a lubricant composition containing said dispersion.

Description

FIELD OF INVENTION[0001]The present invention relates to a method of lubricating an internal combustion engine comprising supplying to said engine a metal base dispersed in an organic medium. The metal base has a high solids content and a particle size of less than 1 μm.BACKGROUND OF THE INVENTION[0002]Lubricating compositions suitable for an internal combustion engine need to lubricate moving parts as well as operate at high temperature and pressures. Whilst the engine is operating, corrosive acids form during combustion along with sludge and other deposits. Typically, detergents such as sulphonates, salicylates or phenates have been employed to neutralize corrosive acids. The detergents often have a total base number (TBN) ranging from 10 to 500. Further conventional detergents deliver a limited TBN relative to treat rate. Therefore it would be advantageous to provide an internal combustion engine with a lubricant with at least one property selected from: providing a source of TBN...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M125/10C10M169/04C10M135/10C10M129/26
CPCC10M125/10C10M141/06C10M141/08C10M161/00C10M171/06C10N2250/02C10N2210/01C10N2220/082C10N2230/52C10N2240/10C10M2201/062C10N2010/02C10N2020/06C10N2030/52C10N2040/25C10N2050/01
Inventor PSAILA, ALEXANDERHOBSON, DAVIDCALDER, RAYMOND
Owner THE LUBRIZOL CORP
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