Anthranilate Esters for Lubricant TBN and Seal Compatibility
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Solution Overview
Problem
Existing lubricants face issues with seal degradation due to basic amine additives, which cause dehydrofluorination in fluoroelastomeric seals, leading to seal failure and performance issues, while over-based metal detergents are limited by sulfated ash restrictions in modern engine oils.
Innovation Solution
Anthranilate esters are used as lubricant additives to provide a base without harming seal performance, boosting the Total Base Number (TBN) of engine oils while maintaining low sulfated ash levels, thereby enhancing lubricant effectiveness without increasing seal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If basic amine additives are added to lubricants to neutralize acidic byproducts and boost TBN, then the neutralization capability and TBN are improved, but seal compatibility deteriorates due to dehydrofluorination of fluoroelastomeric seals
Solution Approach 1:
The patent changes the chemical structure parameters of the amine additive by introducing a specific aromatic ring structure with ortho-substituted amino and carboxylate groups. This structural modification allows the additive to neutralize acids effectively while reducing its reactivity toward fluoroelastomeric seal materials, thus maintaining seal compatibility despite the basic amine functionality.
Solution Approach 2:
The invention creates a composite molecular structure combining aromatic ring, amino group, and carboxylate group in a specific configuration (anthranilate ester structure). This composite structure provides both the base-neutralizing capability and improved seal compatibility that neither simple amines nor conventional detergents achieve alone.
2Reliability
If over-based metal detergents are used to provide base and neutralize acids, then the TBN and neutralization capability are improved, but sulfated ash content increases beyond permissible limits
Solution Approach 1:
The patent extracts the harmful metal component from the detergent structure while retaining the essential base-neutralizing functionality. By using organic anthranilate esters instead of metal-based overbased detergents, the invention eliminates metal ash formation while maintaining acid neutralization capability through the organic amine and carboxylate groups.
Solution Approach 2:
The invention replaces expensive metal-containing detergents with organic alternatives that decompose into harmless substances (CO2, H2O, hydrocarbons) rather than persistent metal ash. The anthranilate ester structure provides temporary base neutralization without leaving harmful residues.
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
Anthranilate esters effectively boost the TBN of engine oils, maintaining seal compatibility and compliance with stringent ash limits, thus improving lubricant performance and reducing engine damage risks.
Implementation Method 1
The invention relates to anthranilate esters which may be used as lubricant additives... basic amines that supply base to a lubricant... ability to boost the TBN of fully formulated engine oils... neutralizing these byproducts and so protecting both the lubricant and the device
Implementation Method 2
These byproducts result from the incomplete combustion of fuel... These byproducts lead to deleterious effects in the engine oil... These byproducts can oxidize hydrocarbons found in the lubricating oil... stabilized against oxidative degradation
Data Source
AI summary
This invention relates to anthranilate esters and their use in lubricants, such as engine oils. The invention particularly relates to compositions that deliver an ash-free base to a lubricant in the form of a basic amine additive, without adversely impacting seal compatibility and/or degradation, and methods thereof.