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Ashless stationary gas engine lubricant

a stationary gas engine and lubricant technology, applied in the field of lubricating oil compositions, can solve problems such as inacceptable piston deposits

Inactive Publication Date: 2005-03-31
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

A low-ash, low-phosphorus lubricant composition suitable for use in a two-cycle stationary gas engine, comprising: (a) an oil of lubricating viscosity; (b) about 1.0 to about 8.0 percent by weight of a succinimide dispersant; (c) about 0.2 to about 4.0 percent by weight of a hindered phenol antioxidant; (d) at least one

Problems solved by technology

Many stationary gas lubricant formulations produce an undesirable amount of piston deposits which can lead to port blocking during field use.
It has been observed that a correlation exists between high levels of nitration of the lubricant during service, and these unacceptable piston deposits.

Method used

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  • Ashless stationary gas engine lubricant
  • Ashless stationary gas engine lubricant
  • Ashless stationary gas engine lubricant

Examples

Experimental program
Comparison scheme
Effect test

example 1

A formulation is prepared in a 650N mineral base oil, comprising the following additive components, amounts expressed in percent by weight: 4.24% high TBN condensed amine succinimide dispersant, containing 40% oil. 1.0% Ca Sulfonate detergent, TBN 13, containing 50% oil. 0.5% Triphenyl phosphite, containing 0% oil 1.0% Hindered phenol-ester antioxidant, commercially available product <0.01% Commercially available silicone defoamer

The formulation contains 0.05 percent by weight phosphorus and 0.5 percent substrate.

example 2 & 3

are commercially available products comprising dispersant(s), antioxidants and anti wear agents.

The above formulation(s) are subjected to the panel coker test, which is a test used to indicate deposit buildup. This is a test that involves splashing test oil at 105° C. for 4 hours onto an aluminum panel maintained at 325° C. Digital imaging of resulting deposits provides a Universal Rating on a scale of 0-100, with higher ratings indicating better performance. Example 1 formulation has a Universal Rating of 68, while Examples 2 and 3 have Universal Ratings of 3 and 9 respectively. It is clear that the invention highlighted in Example 1 illustrates lower deposit build-up, which is particularly desirable.

The formulations are further subjected to an inhibiting oxidation and nitration test. This is a test that involves adding acid and metal napthanate to a fully-formulated oil and mixing at high speed for 60 sec. The mixed samples is heated at 145° C. and purged with NOx for 22 hours....

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Abstract

A low-ash, low-phosphorus lubricant composition suitable for use in a stationary gas engine includes an oil of lubricating viscosity, 1.0 to 8 percent of a succinimide dispersant, 0.8 to 4.0 percent of a hindered, ester-substituted phenol antioxidant, and at least one metal or ammonium-containing sulfonate detergent or metal or ammonium-containing phenate detergent, in an amount which provides 0.1 to 3.0 percent by weight of said sulfonate or phenate moieties exclusive of the weight of the metal or ammonium moieties. The lubricant contains up to 0.08 percent by weight phosphorus and up to 0.2 percent sulfated ash.

Description

BACKGROUND OF THE INVENTION The present invention relates to lubricating oil compositions which provide high performance standards particularly in stationary gas engines. There is continuous need for improving the performance characteristics of engines, in particular stationary gas engines, and the lubricating oils used therein. Stationary gas engines are typically large, heavy duty, stationary engines designed to run on natural gas and other like fuels. Trends in such engines include the development of smaller four-cycle, lean burning engines, for which high performance lubricants are important. There has been a great deal of research reported on various lubricant formulations to solve specific problems. For example, U.S. Pat. No. 5,259,967, Ripple, Nov. 9, 1993, discloses a lubricating oil composition providing less than 1% sulfated ash, comprising an additive package of a carboxylic dispersant, a rust inhibiting mixture, a hydrocarbyl substituted phenol, and a neutralized acid...

Claims

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Application Information

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IPC IPC(8): C10M163/00
CPCC10M163/00C10N2240/10C10M2207/289C10M2215/28C10M2219/046C10M2223/049C10M2229/02C10N2210/01C10N2210/02C10N2230/08C10N2230/10C10N2230/42C10N2230/45C10N2230/52C10M2207/028C10N2010/02C10N2010/04C10N2030/08C10N2030/10C10N2040/25C10N2030/42C10N2030/45C10N2030/52
Inventor BARNES, W. PRESTONPATEL, JAYRAM D.CARRICK, VIRGINIA A.
Owner THE LUBRIZOL CORP
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