Engine Oil Composition Using Sulfur-Detergent Oxidation Control
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Solution Overview
Problem
Existing engine lubricants face challenges in maintaining anti-oxidation performance due to the oxidation of lubricating oil additives, which reduces the performance life of engine oils, necessitating the development of more effective antioxidants.
Innovation Solution
A lubricating oil composition comprising a major amount of lubricating viscosity oil, alkylhydroxybenzoate detergents derived from isomerized normal alpha olefins with 10 to 40 carbon atoms, and ashless sulfur compounds such as sulfurized fatty esters, sulfurized olefins, thiadiazoles, ashless dithiophosphates, sulfurized hindered phenols, and phenothiazines, with a Total Base Number (TBN) of 100 to 300 mg KOH/gm, synergistically controlling oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants are used in engine lubricants, then initial anti-oxidation performance is provided, but oxidation resistance deteriorates over time as additives oxidize
Solution Approach 1:
The patent combines alkylhydroxybenzoate detergents with ashless sulfur compounds to create a composite antioxidant system. This composite approach leverages the synergistic effects between the two additive types, where the alkylhydroxybenzoate provides primary oxidation protection and the ashless sulfur compound offers complementary anti-oxidation mechanisms, resulting in extended performance life and sustained oxidation resistance throughout the oil's service life.
2Reliability
If stronger anti-oxidation additives are introduced to enhance oxidation resistance, then oxidation performance improves, but additive complexity increases
Solution Approach 1:
The alkylhydroxybenzoate detergent serves multiple functions simultaneously: it acts as a detergent to clean engine deposits, provides anti-oxidation protection, and contributes to overall lubricant stability. This multi-functionality reduces the need for separate dedicated antioxidants, thereby simplifying the overall additive package while maintaining or enhancing oxidation performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively enhances the oxidation resistance of engine oils, improving their performance and longevity by combining alkylhydroxybenzoate detergents with ashless sulfur compounds, thereby reducing oxidative degradation.
Implementation Method 1
Oxidation of engine oils negatively impacts the performance of the lubricating oil additives and reduces the performance life of the engine oil
Data Source
AI summary
The present disclosure generally relates to a lubricating oil composition comprising: a major amount of an oil of lubricating viscosity, one or more detergents comprising at least one alkylhydroxybenzoate compound, and an ashless sulfur compound. Also provided is a method of lubricating an engine with said lubricating oil composition.