Lithium Complex Hybrid Grease High Temperature Stability
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Solution Overview
Problem
Lithium complex greases have a lower upper service temperature and higher oil separation compared to urea hybrid greases, making them less suitable for high-temperature applications, while fluorinated greases are expensive and prone to hardening, limiting their use in certain elastomers and industrial settings.
Innovation Solution
A lithium complex hybrid grease is developed by combining polyisobutylene and ester-based lithium complex greases with PFPE oils, specifically PFPE/PTFE, to achieve high-temperature performance similar to ester/urea/PFPE hybrid greases without their disadvantages, with adjustable oil separation by varying the proportions of the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium complex greases are used, then oil separation is reduced and hardening tendency is lowered, but upper service temperature is significantly reduced
Solution Approach 1:
The patent combines lithium complex grease with PFPE grease to create a hybrid grease that integrates the low oil separation and low hardening properties of lithium complex grease with the high temperature stability of PFPE grease. This composite approach allows the grease to maintain reliability at elevated temperatures while avoiding the limitations of pure lithium complex formulations.
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating PFPE (perfluoropolyether) base oil into the lithium complex grease system. This parameter change enables the grease to achieve higher upper service temperatures while maintaining the beneficial low oil separation and low hardening characteristics of the lithium complex thickener system.
2Temperature
If PFPE/PTFE greases are used, then high temperature performance is achieved, but cost increases significantly and hardening occurs
Solution Approach 1:
The patent adjusts the composition parameters by combining PFPE grease with lithium complex grease, creating a hybrid formulation that reduces the proportion of expensive PFPE/PTFE components while maintaining high temperature performance. This parameter optimization achieves cost reduction without sacrificing thermal stability.
Solution Approach 2:
The hybrid grease combines PFPE base oil with lithium complex thickener system to create a composite material that leverages the high temperature stability of PFPE while utilizing the cost-effective lithium complex architecture, thereby reducing overall manufacturing cost while maintaining performance.
3Temperature
If ester/urea/PFPE hybrid greases are used, then high temperature performance is achieved, but post-hardening occurs and oil separation becomes very low
Solution Approach 1:
The patent employs a composite grease structure combining lithium complex thickener with PFPE base oil, replacing the ester/urea hybrid system. This composite approach maintains high temperature performance through PFPE while achieving superior composition stability and controlled oil separation characteristics through the lithium complex thickener architecture.
Solution Approach 2:
The patent changes the thickener system parameter from ester/urea to lithium complex, which fundamentally alters the grease behavior at high temperatures. This parameter change eliminates post-hardening issues and provides stable, controllable oil separation characteristics while maintaining high temperature performance through PFPE incorporation.
Data Source
Figure 1~2
AI summary
The invention relates to a novel lithium complex hybrid grease based on a lithium complex grease in combination with a PFPE grease. The novel lithium complex hybrid grease can be used at higher temperatures, does not form layers in the process, and exhibits a low hardening tendency. The invention additionally relates to the use of the novel lithium complex hybrid grease in components in the automotive field and in the industrial field.