Ester Lubricant Additive for Antiwear and Corrosion Control
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Solution Overview
Problem
Current lubricating oils containing phosphorus and sulfur compounds, such as ZDDP, can lead to increased particulate emissions, copper and lead corrosion, and reduced catalyst performance in catalytic converters, while ashless additives may increase metal corrosion, necessitating a composition that balances antiwear, friction modification, and antioxidant performance without detrimental effects on fuel economy or emissions.
Innovation Solution
A lubricating composition comprising an ester of a carboxylic acid derived from 2,5-dihydroxybenzoic acid, 1,4-dihydroxy-2-naphthoic acid, or 3,5-dihydroxynaphthoic acid, combined with an oil of lubricating viscosity, specifically formulated to provide antiwear, friction modification, and antioxidant performance while minimizing corrosiveness and emissions, with the ester present in a range of 0.01 wt% to 10 wt%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus and sulfur compounds such as ZDDP are used as antiwear additives, then antiwear performance is improved, but particulate emissions increase and catalyst performance is reduced
Solution Approach 1:
The patent changes the chemical composition parameters by using ashless additives (amines, carboxylic acids, esters) instead of traditional phosphorus-sulfur compounds, thereby reducing particulate emissions and sulfated ash while maintaining antiwear and antioxidant performance through alternative chemical mechanisms
Solution Approach 2:
The patent employs biodegradable ashless additives that decompose into harmless substances, replacing persistent phosphorus-sulfur compounds that accumulate and cause emissions problems, thus reducing long-term environmental harm while maintaining protective functions
2Reliability
If phosphorus and sulfur compounds such as ZDDP are used as antiwear additives, then antiwear performance is improved, but copper and lead corrosion increases
Solution Approach 1:
The patent changes the additive chemistry from phosphorus-sulfur compounds to ashless alternatives (amines, carboxylic acids, esters) that provide corrosion protection through different mechanisms, reducing harmful interactions with copper and lead components while maintaining antiwear performance
Solution Approach 2:
The patent introduces ashless additives as intermediary substances that form protective films on metal surfaces without the corrosive side effects of phosphorus-sulfur compounds, mediating between the need for antiwear protection and the need to prevent corrosion
3Object-generated harmful factors
If ashless additives are used to reduce emissions, then particulate emissions are reduced, but metal corrosion increases
Solution Approach 1:
The patent uses composite additive packages combining multiple ashless components (amines, carboxylic acids, esters, and their derivatives) that work synergistically to provide both emission reduction and corrosion protection, overcoming the limitations of single ashless additives
Solution Approach 2:
The patent employs multi-functional ashless additives that simultaneously provide antioxidant, antiwear, and corrosion inhibition properties, eliminating the need for separate additives and avoiding the corrosion problems associated with single-function ashless compounds
4Use of energy by moving object
If friction modifiers are used to reduce the detrimental impact of ZDDP on fuel economy, then fuel economy is improved, but lead corrosion increases
Solution Approach 1:
The patent changes the additive chemistry to ashless friction modifiers that do not contain phosphorus or sulfur, thereby reducing lead corrosion while maintaining fuel economy benefits through alternative friction reduction mechanisms
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 fuel economy, reduces corrosiveness, and inhibits lead, tin, or copper corrosion, improving seal performance and oxidative stability, while minimizing sulfur and phosphorus content to reduce emissions and catalyst poisoning.
Implementation Method 1
The composition effectively enhances fuel economy, reduces corrosiveness, and inhibits lead, tin, or copper corrosion, improving seal performance and oxidative stability
Implementation Method 2
ZDDP antiwear additives protect the engine by forming a protective film on metal surfaces
Implementation Method 3
the composition effectively enhances fuel economy, reduces corrosiveness, and inhibits lead, tin, or copper corrosion
Data Source
AI summary
The invention provides a lubricating composition containing an oil of lubricating viscosity and an ester, thioester, amide or imide of a carboxylic acid compound where said carboxylic acid is characterized in that it is functionalized with a hydroxy-substituted aromatic moiety. The invention further relates to methods of lubricating an internal combustion engine by supplying the described lubricating composition to the internal combustion engine. The invention further relates to the use of the salt of the carboxylic acid compound as an antiwear agent or an antioxidant.