Diurea Grease Composition for Rolling Device Seizure Resistance
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Solution Overview
Problem
Existing grease compositions used in rolling devices under high load or vibratory conditions suffer from reduced lubricating performance, leading to wear or seizure, and increasing resistance to stirring, while existing solutions that enhance seizure resistance compromise on stirring resistance.
Innovation Solution
A grease composition featuring a diurea compound thickener, formed by reacting alkylphenylamine and cyclohexylamine with a diisocyanate, with a specific mole ratio and worked penetration range, is used to improve seizure resistance without deteriorating stirring resistance, and applied to specific contact parts within rolling devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high viscosity base oil is used to improve seizure resistance, then seizure resistance is improved, but resistance to stirring deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the thickener by controlling the mole ratio of cyclohexylamine to alkylphenylamine (80% or more but less than 91% cyclohexylamine), and adjusts the worked penetration to 300-330. This optimization of chemical parameters allows the grease to achieve excellent seizure resistance without excessive stirring resistance, resolving the contradiction between these two properties.
Solution Approach 2:
The invention uses a composite thickener system combining cyclohexylamine and alkylphenylamine in a specific ratio to react with diisocyanate, forming a diurea compound with balanced properties. This composite material approach enables simultaneous achievement of high seizure resistance and acceptable stirring resistance, which cannot be achieved with single-component thickeners.
2Reliability
If the worked penetration is adjusted to 300 to 330, then seizure resistance is improved, but the grease consistency becomes softer
Solution Approach 1:
The invention optimizes the worked penetration parameter to a specific range of 300-330, which corresponds to a softer grease consistency. This parameter optimization, combined with the specific thickener composition (cyclohexylamine content of 80-91% by mole), achieves excellent seizure resistance while maintaining the desired softer consistency for the application.
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 provides excellent seizure resistance and maintains resistance to stirring, effectively preventing wear and seizure in rolling devices by optimizing the thickener's composition and penetration range.
Implementation Method 1
a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound
Implementation Method 2
a lubricant film intervening between a raceway surface and a rolling element is broken during use and lubricating performance declines drastically
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A grease composition which is excellent in seizure resistance can be provided without deteriorating resistance to stirring in the rolling device, and a rolling device in which the grease composition intervenes to a predetermined portion can be also provided by use of a grease composition comprising a base oil and a thickener, the thickener being a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, the amount of cyclohexylamine in the amine mixture being 80% by mole or more and less than 91 % by mole, and a worked penetration being 300 to 330.