Lubricating oil compositions

a technology of lubricating oil and composition, which is applied in the direction of additives, petroleum industry, liquid carbonaceous fuels, etc., can solve the problems of lead and copper corrosion, anti-wear additives, and the use of organic friction modifier additives, so as to reduce and/or inhibit corrosion, suppress corrosion, and reduce the effect of corrosion

Inactive Publication Date: 2015-12-03
INFINEUM INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]In accordance with a fourth aspect, the present invention provides the use, in the lubrication of a spark-ignited or compression-ignited internal combustion engine, of an oil-soluble or oil-dispersible polymeric friction modifier (B) as defined in the first aspect of the invention, as an additive in an effective minor amount, in combination with an oil-soluble or oil-dispersible dihydrocarbyl dithiophosphate metal salt (C) as defined in the first aspect of the present invention, as an additive in an effective minor amount, in a lubricating oil composition comprising an oil of lubricating viscosity in a major amount, to reduce and / or inhibit corrosion (i.e. suppress the corrosion) of the non-ferrous metal containing engine components during operation of the engine. Suitably, the non-ferrous metal containing engine components include copper, lead or an alloy of such metals, especially copper or an alloy thereof.
[0026]In accordance with a fifth aspect, the present invention provides the use, in the lubrication of a spark-ignited or compression-ignited internal combustion engine, of a lubricating oil composition in accordance with the first aspect of the present invention to reduce and / or inhibit corrosion (i.e. suppress the corrosion) of the non-ferrous containing metallic engine components during operation of the engine. Suitably, the non-ferrous metal containing engine components include copper, lead or an alloy of such metals, especially copper or an alloy thereof.
[0027]In accordance with a sixth aspect, the present invention provides a method of inhibiting and / or reducing the corrosion (i.e. suppressing the corrosion) of the non-ferrous metal containing engine components of an engine, which method comprises lubricating the engine with a lubricating oil composition which comprises an oil of lubricating viscosity in a major amount and an oil-soluble or oil-dispersible polymeric friction modifier (B) as defined in the first aspect of the invention, as an additive in an effective minor amount, and operating the engine. Suitably, the non-ferrous metal containing engine components include copper, lead or an alloy of such metals. Suitably, the engine as defined in the sixth aspect of the present invention is a spark-ignited or compression-ignited internal combustion engine.

Problems solved by technology

It has now been found that the use of an ashless organic friction modifier additive, such as GMO, in the lubricant typically produces a significant amount of lead and copper corrosion.
Moreover, when the ashless organic friction modifier additive, such as GMO, is used in combination with a dihydrocarbyl dithiophosphate metal salt anti-wear additive the amount of lead corrosion typically further increases.
The corrosive nature of the ashless organic friction modifier additive, such as GMO, and the increase in lead corrosion attributable to the combination of the ashless organic friction modifier additive and the dihydrocarbyl dithiophosphate metal salt presents problems for the lubricant oil formulator.
For example, the corrosive nature of the additive components, particularly when used in combination, may necessitate reduced treat rates of the additive(s) thereby impacting on the anti-wear performance and / or fuel economy performance of the lubricant; alternatively, or additionally, it may be necessary to include further relatively expensive anti-corrosion additives in the lubricant to counteract the corrosive nature of the dihydrocarbyl dithiophosphate metal salts and ashless organic friction modifier additives.

Method used

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  • Lubricating oil compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Polymeric Friction Modifier (B)

[0160]A 500 cm3 5-necked round-bottomed flask equipped with a nitrogen purge, stirrer with a gas-tight stirrer bearing, temperature probe and distillation arm attached to an exit bubbler was charged with PIBSA (158.4 g, 0.128 mol), PEG600 (101.0 g, 0.168 mol), sebacic acid (10.4 g, 0.0514 mol) and glycerol (7.7 g, 0.0835 mol) and the mixture heated at 180° C. with stirring for 1 hour. The reaction mixture was then heated to a temperature of 230° C. for 1 hour and then tetrabutyl titanate (0.5 ml) added thereto and heating and stirring continued for 2 hours at a temperature of 230° C. and a reduced pressure of between 50 to 150 mbar. The reaction mixture was cooled to below 100° C. and the polymeric friction modifier (B) poured from the round bottom flask. The polymeric friction modifier (B) had an acid value of 1.7 mg KOH / g.

example 2

Anti-Corrosion Performance

[0161]Six lubricating oil compositions (referred to as the base lubricant and Oils 1 to 5) were prepared. Each of the base lubricant and Oils 1 to 5 contained an identical Group II base stock and equal amounts of the following identical additives: an overbased calcium sulphonate detergent (TBN 300 mg KOH / g); a dispersant; anti-oxidants; a molybdenum friction modifier; and a viscosity modifier. Oils 1 to 5 also included the additional additive(s), on an active ingredient basis, as detailed in Table 1. Those oils which included ZDDP (i.e. Oils 3 to 5) had a phosphorus content of 880 ppm as measured by ASTM D5185. Oil 5 represents a lubricating oil composition of the present invention.

TABLE 1BaseOil 1Oil 2Oil 3Oil 4Oil 5ComponentlubricantMass %Mass %Mass %Mass %Mass %ZDDP———1.101.101.10Polymeric—0.50———0.50frictionmodifier(B)1Glycerol——0.50—0.50—monooleate1The polymeric friction modifier was the compound of Example 1.

Testing and Results

[0162]Corrosion control ...

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PUM

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Abstract

A lubricating oil composition having a sulphated ash content of less than or equal to 1.2 mass % as determined by ASTM D874 and a phosphorous content of less than or equal to 0.12 mass % as determined by ASTM D5185, which lubricating oil composition comprises or is made by admixing: an oil of lubricating viscosity, in a major amount; an oil-soluble or oil-dispersible polymeric friction modifier as an additive in an effective minor amount; and, an oil-soluble or oil-dispersible dihydrocarbyl dithiophosphate metal salt as an additive in an effective minor amount.

Description

FIELD OF THE INVENTION[0001]The present invention relates to automotive lubricating oil compositions. More specifically, although not exclusively, the present invention relates to automotive crankcase lubricating oil compositions for use in gasoline (spark-ignited) and diesel (compression-ignited) internal combustion engines, such compositions being referred to as crankcase lubricants; and to the use of additives in such lubricating oil compositions for improving the anti-corrosion performance properties in respect of the non-ferrous metallic engine components (i.e. suppressing the corrosion of the non-ferrous metallic engine components), particularly the engine components containing copper and / or lead (e.g. bearings).BACKGROUND OF THE INVENTION[0002]A crankcase lubricant is an oil used for general lubrication in an internal combustion engine where an oil sump is situated generally below the crankshaft of the engine and to which circulated oil returns.[0003]Anti-wear agents are typi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M161/00
CPCC10M161/00C10M2203/1006C10M2209/111C10M2223/045C10N2010/04C10N2030/06C10N2030/42C10N2030/45C10N2030/12C10N2040/252C10N2040/28C10M137/10C10M145/22C10M145/38C10M159/12C10M163/00C10N2010/02C10M2229/054C10M2219/082C10M2209/11C10M2205/026C10N2040/25
Inventor STRONG, ANTHONY J.WOODWARD, PHILIP J.
Owner INFINEUM INT LTD
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