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Anti-wear composition for low sulfur, low sulfated ash and low phosphorus lubricating oil composition for heavy duty diesel engines

Inactive Publication Date: 2007-03-01
CHEVRON ORONITE TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024] The Mannich condensation product employed in the anti-wear additive composition of the present invention surprisingly shows anti-wear performance while maintaining good detergency.
[0044] Metal di-alkyl di-thiophosphates may also be included in the lubricating oil composition of the present invention to control wear. However, it may be advantageous to control the amount of these additives because their metal contributes to sulfated ash in the lubricating oil and the phosphorus will be harmful to the exhaust gas oxidation catalysts. Examples of metal di-alkyl di-thiophosphates are zinc and molybdenum salts of di-alkyl di-thiophosphates.

Problems solved by technology

The zinc in zinc di-alkyl di-thiophosphates may also contribute to sulfated ash which may clog the particulate filters.
Sulfuric acid may also indirectly contribute to clogging the particulate filters by wetting the particulates, thus adding to their mass.
The sulfuric acid and the sulfates also poison the oxidation catalysts in the exhaust gas cleaning devices which may also result in failure to meet emission requirements.
A number of patents and patent applications have discussed methods for reducing particulate emissions and low sulfur, low sulfated ash and low phosphorus lubricating oil compositions, but none have disclosed a low sulfur, low sulfated ash and low phosphorus lubricating oil composition comprising an anti-wear additive composition comprising a Mannich condensation product for a low emission diesel engine, wherein the anti-wear additive composition is also providing detergency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0087] Comparative Formulations A and B and Test Formulation C contained an ashless dispersant, an anti-oxidant, a viscosity index improver, a medium overbased alkyl phenate, an anti-wear agent and a foam inhibitor. Base oil was used to make-up a 100 percent of each of Comparative Formulations A and B and Test Formulation C. Comparative Formulations A and B and Test Formulation C are given in more detail in Table I below.

[0088] The weight percent calcium concentration based on the total weight of the lubricating oil in each of the Comparative Formulations A and B and Test Formulation C was kept constant, and it is shown in Table II below. The anti-wear performance of Test Formulation C containing the anti-wear additive composition of the present invention comprising, a calcium salt of a Mannich condensation product, was compared with Comparative Formulation A containing only a mixture of a calcium salt of an alkyl hydroxyaromatic carboxylic acid and a calcium salt of an alkylphenol...

example 2

Modified 4-Ball Test

[0102] The anti-wear performance of Test Formulation C was compared to Comparative Formulations A and B was evaluated using a modification of the 4-Ball Test. The modification of the Test involved preaging the samples of Formulations A-C. The preaging was conducted to allow for the building of a protective layer of the anti-wear additive composition of the present invention and to account for the oxidation decomposition products' impact on an additive's anti-wear performance. Comparative Formulations A and B and Test Formulation C, approximately 10 milliliter samples, were preaged for 2 days at 160° C. in the presence of the metal balls. The test was started with a 10 kilogram load, which was increased step-wise to a total of 90 kilograms. Oil temperature at the center of the three fixed balls, torque and displacement of the load lever arm were recorded during the test. A wear index was calculated at the end of the test based on the arm displacement data. This m...

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PUM

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Abstract

The present invention is directed to a low sulfur, low sulfated ash and low phosphorus lubricating oil composition for low emission heavy duty diesel engines comprising (a) a major amount of an oil of lubricating viscosity and (b) at least 5 weight percent of an anti-wear additive composition comprising a metal salt of a Mannich condensation product based on the total weight of the lubricating oil. The present invention is also directed to a low sulfur, low sulfated ash and low phosphorus lubricating oil concentrate comprising (a) an oil of lubricating viscosity and (b) at least 5 weight percent of an anti-wear additive composition comprising a metal salt of a Mannich condensation product based on the total weight of the lubricating oil.

Description

FIELD OF THE INVENTION [0001] The present invention is directed to a low sulfur, low sulfated ash and low phosphorus lubricating oil composition for low emission heavy duty diesel engines comprising (a) a major amount of an oil of lubricating viscosity and (b) at least 5 weight percent of an anti-wear additive composition comprising a metal salt of a Mannich condensation product based on the total weight of the lubricating oil. The present invention is also directed to a low sulfur, low sulfated ash and low phosphorus lubricating oil concentrate comprising (a) an oil of lubricating viscosity and (b) at least 5 weight percent of an anti-wear additive composition comprising a metal salt of a Mannich condensation product based on the total weight of the lubricating oil. BACKGROUND OF THE INVENTION [0002] Heavy duty diesel internal combustion engines mounted on motor-driven vehicles, constructions machines and power generators are generally driven using gas oil or heavy oil (which is a ...

Claims

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Application Information

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IPC IPC(8): C10M159/16
CPCC10M159/16C10M2217/043C10N2210/01C10N2210/02C10N2220/027C10N2240/102C10N2230/06C10N2230/42C10N2230/43C10N2230/45C10N2220/028C10N2010/02C10N2010/04C10N2030/06C10N2020/069C10N2020/071C10N2030/42C10N2030/43C10N2030/45C10N2040/252
Inventor KLEIJWEGT, PETER
Owner CHEVRON ORONITE TECH BV
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