Engine Oil Composition for Wear and Oxidation Stability
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Solution Overview
Problem
Existing lubricants fail to effectively address the need for improving wear performance while also improving oxidation performance, deposit control, and thermal stability, particularly in the field of lubricating oils used for automobiles, particularly those for compression ignition engines, with a focus on enhancing oxidation stability and reducing wear in engine oils.
Innovation Solution
A lubricating oil composition comprising a major amount of lubricating viscosity oil, an overbased metal salt of an alkyl-substituted phenate detergent derived from isomerized normal alpha olefin, magnesium-containing detergents, and zinc dialkyl dithiophosphate compounds, with specific molar ratios and concentrations to enhance oxidation stability, deposit control, and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional engine oil formulations with standard additives are used, then basic lubrication function is provided, but wear performance and oxidation stability are insufficient
Solution Approach 1:
The patent combines multiple detergent additives (calcium phenate, magnesium sulfonate, zinc dialkyldithiophosphate) in specific ratios to create a composite additive package that delivers synergistic effects for improved oxidation stability and wear protection, rather than relying on a single additive
2Reliability
If more additives are added to improve wear performance and oxidation stability, then lubrication performance improves, but formulation complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses multi-functional detergent additives that simultaneously provide detergency, dispersion, oxidation inhibition, and wear protection properties, reducing the need for separate specialized additives for each function
3Stability of the object's composition
If standard detergent additives are used, then deposit control is provided, but thermal stability and deposit control are not sufficient
Solution Approach 1:
The patent modifies the chemical parameters of the detergent additives by using overbased formulations with specific base excess levels and controlling the molecular structure of the detergent molecules to enhance thermal stability and reduce deposit formation at high operating temperatures
Data Source
AI summary
Disclosed is a lubricating oil composition which comprises: (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100°C in a range of about 2 to about 50 mm2/s, (b) an overbased metal salt of an alkyl-substituted phenate detergent, wherein the alkyl group is derived from an isomerized normal alpha olefin having from about 10 to about 40 carbon atoms per molecule and having an isomerization level (I) of the normal alpha olefin of from about 0.1 to about 0.4 in an amount to provide at least 1000 ppm of calcium, (c) one or more magnesium-containing detergents having about 100 to about 1000 ppm of magnesium, based on the total weight of the lubricating oil composition, and (d) one or more zinc dialkyl dithiophosphate compounds derived from a primary alcohol.