Friction Modifier Composition Using Ester Additives
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Solution Overview
Problem
Existing lubricants face challenges in maintaining lubrication properties at elevated temperatures and extreme pressures, leading to increased acidity and viscosity, which can cause metal corrosion and wear, and current friction modifiers like ZDDP and molybdenum compounds have drawbacks such as particulate emission and interference with other additives.
Innovation Solution
A synergistic friction modifier composition combining metal-based friction modifiers, such as molybdenum dialkyldithiocarbamate, with short chain alkyl esters of hydroxy carboxylic acids like tributyl citrate, which reduces the amount of metal-containing additives required while maintaining performance, especially at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal-based friction modifiers like ZDDP and molybdenum compounds are used to reduce friction and wear, then lubrication performance is improved, but particulate emission increases and interference with other additives occurs
Solution Approach 1:
The invention extracts and eliminates harmful metal-containing additives (ZDDP, molybdenum compounds) from the lubricant composition while maintaining their beneficial friction-reducing and wear-preventing functions through the use of non-metallic alternatives based on esters of hydroxy carboxylic acids combined with sulfur-containing additives
Solution Approach 2:
The invention changes the chemical composition parameters by replacing metal-based friction modifiers with organic ester-based additives, specifically using esters of hydroxy carboxylic acids (citric acid, tartaric acid, gluconic acid) combined with sulfur-containing compounds to achieve similar or superior lubrication performance without metal particulate emissions
2Reliability
If metal-based friction modifiers are used to modify lubricity and load bearing properties, then friction reduction is achieved, but interference with dispersants and particulate formation occurs
Solution Approach 1:
The invention removes metal-containing friction modifiers from the lubricant system and replaces them with organic ester-based alternatives that provide equivalent friction reduction without generating metal particulates that interfere with dispersant functionality
Solution Approach 2:
The invention creates a composite additive system combining esters of hydroxy carboxylic acids with sulfur-containing additives to achieve synergistic effects that provide both friction reduction and wear protection without the harmful side effects of metal-based compounds
3Reliability
If lubricants are used at elevated temperatures and extreme pressures, then lubrication function is maintained, but deterioration occurs with increased acidity and viscosity
Solution Approach 1:
The invention converts the potential harm of high-temperature operation by using additives that are specifically designed to be thermally stable and resistant to oxidation, transforming the harsh high-temperature environment into a condition where the lubricant actually performs optimally rather than deteriorating
Solution Approach 2:
The invention changes the chemical composition to include esters of hydroxy carboxylic acids and sulfur-containing additives that have superior thermal stability and oxidation resistance compared to conventional additives, allowing the lubricant to maintain its properties at elevated temperatures and extreme pressures
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 combination significantly reduces the friction coefficient of lubricating oils, allowing for less metal usage in lubricants used in engines and power transmission systems, effective over a wide temperature range and reducing wear and corrosion.
Implementation Method 1
Molybdenum friction modifiers are widely known and are effective over a broad temperature range, especially upon reaching temperatures of ~120° C. or higher where chemical transformations form Mo-Sulfide glass coatings on surfaces.
Implementation Method 2
A surprising reduction in the friction coefficient of lubricating oils is obtained by blending metal based friction modifiers, such as organo molybdenum friction modifiers, with short chain alkyl esters, e.g., C1-8 alkyl, C1-6 alkyl or C1-4 alkyl esters, of hydroxy carboxylic acids
Data Source
AI summary
Combining a metal based friction modifier, such as a molybdenum dialkyldithiocarbamate, and certain esters of hydroxy carboxylic acids, such as short chain alkyl esters of citric or tartaric acid, e.g., tributyl citrate, has a synergistic effect on lowering the friction coefficient of lubricating oils allowing one to reduce the amount of metal based friction modifier needed to adequately formulate a lubricant with low friction characteristics.