Grease Composition with Sulfolane Derivative Additive
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Solution Overview
Problem
Current grease compositions face challenges in achieving high lubricity, particularly in demanding operating conditions of smaller, lighter, and higher-output devices, where maintaining a lubricant film on sliding surfaces is difficult.
Innovation Solution
A grease composition incorporating a sulfolane derivative as a novel additive, combined with a lubricant base oil and thickener, such as diphenyl hydrogen phosphite and tricresyl phosphate, to enhance lubricity, characterized by a specific chemical formula and concentration ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional additives (phosphite esters, organic molybdenum, zinc dithiophosphate) are used to improve lubricity, then lubrication performance is enhanced, but the lubricity is still insufficient for demanding operating conditions
Solution Approach 1:
The patent changes the chemical structure parameter of the additive by using a sulfolane derivative with specific molecular architecture (formula 1) instead of conventional additives. This structural parameter change results in superior lubricity performance, achieving a coefficient of friction of 0.05 or less and excellent load bearing characteristics that conventional additives cannot achieve.
Solution Approach 2:
The patent creates a composite grease composition by combining the sulfolane derivative additive with specific base oils (mineral oil, synthetic oil, or their mixtures) and thickeners (lithium soap, calcium soap, or urea-based thickener). This composite formulation synergistically enhances lubricity beyond what individual components can achieve alone.
2Productivity
If grease is used for sliding surfaces in smaller, lighter, higher-output devices, then device performance is improved, but maintaining a lubricant film becomes difficult
Solution Approach 1:
The sulfolane derivative modifies the physical-chemical parameters of the lubricant film, creating a more stable and adherent film that can withstand the demanding conditions of high-output, smaller devices. The specific molecular structure of the sulfolane derivative enhances film stability without requiring increased lubricant quantity.
3Strength
If existing grease formulations are used, then basic lubrication is provided, but high load bearing characteristics and low friction coefficients cannot be achieved
Solution Approach 1:
The patent achieves the contradiction of high load bearing strength and low friction coefficient simultaneously by introducing the sulfolane derivative. This additive modifies the tribological parameters of the grease, enabling the formation of a protective film that both supports high loads and minimizes friction, achieving a coefficient of friction of 0.05 or less while maintaining excellent load bearing capacity.
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 grease composition exhibits improved lubricity with low friction coefficients and high load-bearing characteristics, suitable for applications in sliding portions and rotors of automobiles and electrical devices.
Implementation Method 1
a sulfolane derivative represented by the following general formula (1)... The grease composition of the present invention has distinguishing effects including a low coefficient of friction, high load bearing characteristics, and excellent lubricity
Implementation Method 2
Grease is typically used for sliding surfaces where moving contact surfaces make it difficult to keep a lubricant film adhered to the lubricated surfaces... The grease composition exhibits improved lubricity with low friction coefficients
Data Source
AI summary
Provided herein is a grease composition of excellent lubricity containing a novel additive for grease. The grease composition includes a lubricant base oil, a thickener, and a sulfolane derivative represented by the following general formula (1). In the formula, R1 represents a hydrocarbon group of 1 to 20 carbon atoms, and R2 and R3 each represent hydrogen, or a hydrocarbon group of 1 to 20 carbon atoms.