Fuel Battery Stack Sealing Composition for Hydrofluoric Acid Resistance
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Solution Overview
Problem
Existing seal members in fuel batteries lack sufficient hydrofluoric acid resistance, leading to potential leakage and instability over time.
Innovation Solution
A fuel battery stack with seal members made from a perfluoropolyether compound-containing curable composition, comprising perfluoropolyether polymer, fluorine-modified organosilicon compound, hydrosilylation reaction catalyst, and reinforcing filler, providing enhanced hydrofluoric acid resistance and sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional seal members are used in fuel batteries, then the device can be manufactured with standard materials, but the seal members lack sufficient hydrofluoric acid resistance leading to potential leakage and instability
Solution Approach 1:
The seal member is constructed as a composite material comprising a fluororubber base polymer and perfluoropolyether compound. This composite structure combines the chemical resistance of fluororubber with the enhanced hydrofluoric acid resistance provided by the perfluoropolyether compound, achieving superior performance while maintaining manufacturability through established composite material processing techniques
Solution Approach 2:
The invention modifies the chemical composition parameters of the seal member by incorporating specific ratios of perfluoropolyether compound (5-50 parts by mass per 100 parts by mass of fluororubber base polymer). This parameter optimization enhances hydrofluoric acid resistance while maintaining compatibility with standard manufacturing processes
2Reliability
If the seal member composition is optimized for hydrofluoric acid resistance, then reliability improves, but the manufacturing process becomes more complex
Solution Approach 1:
The invention optimizes the composition parameters within specific ranges (5-50 parts per 100 parts of perfluoropolyether compound) to achieve hydrofluoric acid resistance without requiring complex multi-component systems. This parameter-based approach simplifies the overall composition while maintaining superior reliability
Solution Approach 2:
The perfluoropolyether compound is specifically incorporated in the seal member composition where hydrofluoric acid resistance is most critical, while the base fluororubber provides the fundamental sealing structure. This localized enhancement achieves high reliability without unnecessarily complicating the entire seal member system
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 seal members maintain excellent sealing properties over a long period, ensuring the stability and efficiency of the fuel battery operation.
Implementation Method 1
a perfluoropolyether compound-containing curable composition, comprising perfluoropolyether polymer, fluorine-modified organosilicon compound, and hydrosilylation reaction catalyst
Data Source
AI summary
A fuel battery stack including a seal member that can be industrially advantageously manufactured and has excellent hydrofluoric acid resistance. A fuel battery including the fuel battery stack. The fuel battery stack is formed by stacking together a plurality of fuel battery cells, each including a pair of separators and a membrane electrode assembly held therebetween. Each of the separators has a seal member disposed thereon. The seal member is a cured product of a perfluoropolyether compound-containing curable composition.