Alkenyl Ester Friction Modifiers for Longer-Lasting Engine Lubricants
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Solution Overview
Problem
Friction modifiers like glycerol monooleate (GMO) in lubricants degrade due to hydrolysis and heat, leading to reduced effectiveness and negative impact on fuel economy in internal combustion engines.
Innovation Solution
Incorporating a C10 to C14 alkenyl carboxylic acid ester of an aliphatic diol or polyol as a friction modifier, which is slowly released through a Johnson-Claisen rearrangement and deprotection process, maintaining friction reduction over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GMO is used as a friction modifier, then friction reduction is achieved, but the friction modifier degrades over time due to hydrolysis and heat
Solution Approach 1:
The patent applies preliminary action by incorporating a precursor compound (protected alkenyl carboxylic acid ester) that will transform into the active friction modifier under engine conditions. The protecting group is removed in situ through heat and acid catalysis, allowing the active compound to be generated when needed rather than being present from the start, thus preventing premature degradation
Solution Approach 2:
The patent changes the chemical parameters of the friction modifier by using a protected precursor form instead of the active GMO form. The protecting group (such as acetal or ketal) modifies the chemical stability parameters, allowing the compound to resist hydrolysis and heat degradation while maintaining the capability to transform into the active friction-reducing form under engine operating conditions
2Temperature
If heat is applied in the engine, then lubrication function is maintained, but friction modifiers like GMO degrade due to heat and acid formation
Solution Approach 1:
The patent converts the harmful effects of heat and acid formation into a beneficial transformation process. The heat and acid that would normally degrade GMO are instead used to catalyze the deprotection of the precursor compound, generating the active friction modifier in situ. The harmful thermal and chemical environment becomes the activation mechanism for the friction reduction function
3Productivity
If conventional friction modifiers are used, then initial friction reduction is achieved, but effectiveness is lost due to degradative chemical reactions
Solution Approach 1:
The patent implements self-service by designing a system where the lubricating composition generates its own active friction modifier from the precursor compound under engine operating conditions. The heat and acid produced by engine operation automatically catalyze the transformation, eliminating the need for external activation or replacement mechanisms. The system serves itself by converting operational stress into functional activation
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 alkenyl carboxylic acid ester provides sustained friction reduction and improved fuel economy by resisting degradation, enhancing the longevity and performance of lubricating compositions.
Implementation Method 1
slowly released through a Johnson-Claisen rearrangement and deprotection process
Implementation Method 2
slowly released through a Johnson-Claisen rearrangement and deprotection process
Data Source
AI summary
The instant disclosure relates to lubricating compositions having improved frictional properties. The lubricating compositions include an oil of lubricating viscosity and a friction modifier that is a C10 to C14 alkenyl carboxylic acid ester of an aliphatic diol or polyol, where the double bond of the alkenyl group is within or directly attached to the longest continuous chain of the alkenyl group.