Calcium Complex Grease Composition for High-Temperature Shear Stability
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Solution Overview
Problem
Conventional greases face challenges in shear stability and supply stability, with lithium complex greases facing raw material instability and urea greases having toxic substances, necessitating a grease composition with high supply stability, environmental compatibility, and heat resistance.
Innovation Solution
A calcium complex grease composition incorporating a thickening agent comprising C18-22 straight-chain higher fatty acid, aromatic monocarboxylic acid, C2-4 straight-chain saturated lower fatty acid, and substituted or unsubstituted saturated dicarboxylic acid, with a calcium dicarboxylate compound content of 5 to 70% by mass, enhancing shear stability and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If lithium complex grease is used to achieve wider operating temperature range, then heat resistance is improved, but supply stability deteriorates due to raw material instability and cost increase
Solution Approach 1:
The patent replaces lithium-based materials with calcium-based materials that are more abundant and stable in supply. The invention uses calcium complex soap formed from calcium hydroxide and higher fatty acids, eliminating dependence on lithium raw materials while maintaining high-temperature performance.
2Temperature
If urea grease is used for high temperature applications, then heat resistance is improved, but environmental compatibility deteriorates due to toxic substances
Solution Approach 1:
The patent eliminates toxic urea and heavy metals by using calcium-based thickening agents derived from natural fatty acids. The calcium complex soap system provides high-temperature stability without the environmental hazards of traditional urea greases, making it a safer alternative for industrial and consumer applications.
3Ease of manufacture
If conventional calcium complex grease is used to maintain consistency, then ease of manufacture is improved, but shear stability deteriorates
Solution Approach 1:
The patent creates a composite thickening system by combining calcium complex soap with specific additives including polyalphaolefin and ester compounds. This composite approach enhances shear stability while maintaining the ease of manufacture associated with calcium-based systems, achieving both goals simultaneously.
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 calcium complex grease composition exhibits improved shear stability and heat resistance, maintaining lubrication performance under severe conditions, suitable for high-temperature applications in various machinery and industries.
Implementation Method 1
a calcium complex grease composition containing a base oil and a thickening agent consisting of a calcium complex soap
Implementation Method 2
thickening agent comprising a C18-22 straight chain, substituted or unsubstituted higher mono fatty acid; a substituted or unsubstituted aromatic monocarboxylic acid having a benzene ring
Implementation Method 3
the amount of calcium dicarboxylate compound is 5 to 70% by mass based on the total mass of thickening agent
Implementation Method 4
improved shear stability and heat resistance, maintaining lubrication performance under severe conditions
Implementation Method 5
suitable for high-temperature applications in various machinery and industries
Data Source
AI summary
A grease composition containing a base oil and a calcium complex soap as a thickening agent, wherein a C18-22 straight chain, substituted or unsubstituted higher fatty acid; a substituted or unsubstituted aromatic monocarboxylic acid having a benzene ring; a C2-4 straight-chain saturated lower fatty acid; and a substituted or unsubstituted saturated dicarboxylic acid are used as carboxylic acids constituting the calcium complex soap.