Nitrile Compound Lubricant for Engine Wear and Corrosion
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Solution Overview
Problem
Current engine lubricants face challenges with antiwear additives like ZDDP, which affect fuel economy and corrosion, and ashless friction modifiers that can increase metal corrosion, while reducing these additives leads to increased wear and corrosion, necessitating a composition that balances antiwear performance, friction modification, and corrosion inhibition.
Innovation Solution
A lubricating composition comprising an oil of lubricating viscosity and a nitrile compound derived from reacting a carbonyl-containing compound with a compound represented by N≡C—CH2-T, followed by reaction with a thiol or amine, providing antiwear, friction modification, and corrosion inhibition properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ZDDP antiwear additives are used to protect engine components, then antiwear performance is improved, but fuel economy deteriorates and lead/copper corrosion increases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing ZDDP with a nitrile compound having specific molecular structure characteristics (formula I), which alters the lubricant's interaction with metal surfaces and combustion processes, thereby improving fuel economy while maintaining antiwear protection
Solution Approach 2:
The nitrile compound provides effective antiwear protection at lower concentrations compared to ZDDP, allowing the lubricant to achieve protective effects with less additive content, reducing overall harmful substance levels in the engine oil
2Loss of energy
If ashless friction modifiers are used to improve fuel economy, then fuel economy is improved, but copper and lead corrosion increases
Solution Approach 1:
The nitrile compound acts as an intermediary substance that mediates between friction reduction requirements and corrosion protection needs, forming protective films on metal surfaces while maintaining low friction characteristics, thus avoiding the corrosion problem associated with ashless friction modifiers
3Object-generated harmful factors
If phosphorus-containing antiwear agents are reduced to lower emissions, then particulate emissions are reduced, but wear protection deteriorates
Solution Approach 1:
The nitrile compound provides effective wear protection at lower concentrations compared to phosphorus-containing agents, allowing reduction of phosphorus content in the lubricant while maintaining adequate wear protection, thereby reducing particulate emissions and catalyst poisoning
Solution Approach 2:
The patent changes the additive chemistry from phosphorus-based to nitrile-based compounds, fundamentally altering the wear protection mechanism to one that does not produce harmful phosphorus emissions while maintaining or improving wear protection performance
4Reliability
If multiple additives are used to address various engine protection needs, then comprehensive protection is improved, but additive interactions increase harmful effects
Solution Approach 1:
The nitrile compound exhibits multi-functionality, providing antiwear protection, friction modification, and corrosion inhibition simultaneously, reducing the need for multiple separate additives and minimizing harmful interactions between different additive packages
Solution Approach 2:
The patent combines multiple protective functions into a single nitrile compound additive, merging antiwear, friction reduction, and corrosion protection capabilities into one substance that works synergistically with other lubricant components
Data Source
AI summary
The invention provides a lubricating composition containing an oil of lubricating viscosity and a nitrile compound. The invention further relates to a method of the lubricating an internal combustion engine with the lubricating composition.