Imide Compound Grease Thickener High Temperature Durability
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Solution Overview
Problem
Conventional grease compositions, particularly those using urea thickening agents, fail to provide adequate durability at high temperatures, which is a challenge in the context of advanced engine room conditions with increased temperature and load demands.
Innovation Solution
A novel imide compound is developed, represented by a specific general formula, which serves as a thickening agent for grease, and a method for producing it is described, involving the reaction of an aromatic tetracarboxylic dianhydride with a diamine and a monoamine, resulting in an imide compound that enhances grease durability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If urea thickening agents are used in grease compositions, then the grease provides adequate lubrication, but the durability at high temperatures is insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the thickening agent by using imide compounds with specific molecular structures (formula 1) instead of conventional urea compounds. This parameter change in the chemical structure provides improved thermal stability and durability at high temperatures while maintaining lubrication effectiveness.
Solution Approach 2:
The invention employs composite material strategy by creating a grease composition that combines imide compound thickening agents with specific base oils and additives. This composite approach integrates multiple functional components where the imide compound provides thermal stability, the base oil provides lubrication, and additives enhance specific properties, resulting in superior high-temperature durability.
2Weight of moving object
If single row ball bearings are used to reduce weight and cost, then the bearing space volume is reduced, but the grease filling amount decreases and heat generation increases
Solution Approach 1:
The invention changes the thermal properties parameter of the grease by using imide compound thickening agents that provide superior high-temperature stability. This allows the grease to maintain its lubricating properties and reduce heat generation in single row ball bearings even when the grease filling amount is reduced due to smaller bearing space volume.
3Object-affected harmful factors
If engine room hermeticity is increased to improve silence, then the temperature in the engine room increases
Solution Approach 1:
The invention changes the thermal resistance parameter of the lubrication system by using imide compound-based grease that can operate effectively at higher temperatures. This allows the engine room hermeticity to be increased for noise reduction without compromising the lubrication performance, as the grease maintains its properties in the elevated temperature environment.
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 imide compound and the corresponding grease composition exhibit superior durability at high temperatures, outperforming conventional urea-based solutions, making them suitable for use in high-temperature applications such as constant velocity gears and roller bearings.
Implementation Method 1
a first step of reacting an aromatic tetracarboxylic dianhydride represented by the following general formula (2) with a diamine represented by the following general formula (3) to obtain a reaction intermediate represented by the following general formula (4); and a second step of reacting the reaction intermediate with a monoamine represented by the following general formula (5) to obtain the imide compound
Data Source
AI summary
The present invention provides an imide compound represented by the following general formula (1). The imide compound of the present invention, particularly when used as a thickening agent for grease, is excellent in durability at high temperatures.[wherein X represents a tetravalent residue obtained by removing four carboxylic groups from an aromatic tetracarboxylic acid, Y represents a divalent residue obtained by removing two amino groups from an aliphatic diamine or an aromatic diamine, and R represents a residue obtained by removing an amino group from an aliphatic monoamine, an alicyclic monoamine, or an aromatic monoamine.]