Friction Modifier Composition Using Synergistic Ester Additives
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Solution Overview
Problem
Existing lubricants face challenges in maintaining effective lubrication properties at elevated temperatures and extreme contact pressures, leading to increased acidity and viscosity, which can cause metal corrosion and wear, and are hindered by the drawbacks of metal-containing friction modifiers like zinc dialkyldithiophosphates, such as particulate emissions and interference with other additives.
Innovation Solution
A synergistic friction modifier composition combining metal-based friction modifiers, such as molybdenum dialkyldithiocarbamates, with short chain alkyl esters of hydroxy carboxylic acids like tributyl citrate, which reduces the amount of metal-based additives required while maintaining performance, especially at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal-based friction modifiers like zinc dialkyldithiophosphates are used to reduce friction and provide antiwear protection, then lubrication performance is improved, but particulate emissions increase and interference with other additives occurs
Solution Approach 1:
The patent extracts and removes metal-based friction modifiers from the lubricant composition, replacing them with non-metallic alternatives. This eliminates the source of particulate emissions while maintaining the essential friction reduction and antiwear functions through organic additive packages
Solution Approach 2:
The patent changes the chemical composition parameters by substituting metal-containing compounds with organic-based additives. This parameter change maintains the functional performance (friction modification, antiwear protection) while eliminating the harmful particulate emissions associated with metal-based additives
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 other additives occurs
Solution Approach 1:
The patent removes metal-based friction modifiers from the additive package, eliminating their interfering effects on dispersants and other additives. The essential friction reduction function is maintained through non-metallic alternative additives that are compatible with the complete additive package
Solution Approach 2:
The patent employs a composite additive package combining multiple organic-based friction modifiers and antiwear additives that work synergistically. This composite approach replaces the problematic metal-based additives while maintaining comprehensive protection and avoiding interference with other lubricant components
3Temperature
If lubricants are exposed to elevated temperatures and extreme contact pressures, then lubrication service is provided, but deterioration occurs with increased acidity and viscosity
Solution Approach 1:
The patent incorporates robust antioxidant and antiwear additives in the lubricant formulation before the lubricant is subjected to high temperatures and extreme pressures. These additives act as protective agents that prevent or mitigate oxidation and decomposition reactions, cushioning the base oil against deterioration and maintaining chemical stability throughout the service life
Solution Approach 2:
The patent modifies the chemical composition by incorporating heat-stable and pressure-resistant additive packages. These additives are specifically selected and formulated to maintain their effectiveness under elevated temperatures and extreme contact pressures, preventing the base oil from deteriorating and maintaining consistent viscosity and acidity levels throughout the operating range
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
This combination significantly reduces the friction coefficient of lubricating oils, allowing for less metal usage and improved lubrication properties across a wide temperature range, effectively addressing the limitations of traditional friction modifiers.
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.