Electrolyte Membrane Drying Apparatus Preventing Discoloration
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Solution Overview
Problem
Conventional methods for manufacturing electrolyte membranes often result in residual solvent residues due to competitive evaporation of solvents during drying, leading to discoloration and impaired fuel cell performance.
Innovation Solution
A method involving the controlled drying of an ionomer composition with a solvent admixture, where solvents with different boiling points are evaporated selectively, and the use of a gas in a saturated state to prevent competitive evaporation, along with heat-treatment to ensure complete solvent removal, is employed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drying methods are used to remove solvents from the electrolyte membrane, then the drying process is simple and fast, but residual solvents remain causing discoloration and deteriorating fuel cell performance
Solution Approach 1:
The drying process is segmented into multiple sequential drying stages, each with different temperature and humidity conditions. The first drying stage uses a relatively high temperature to rapidly remove most solvents, while subsequent stages use lower temperatures to remove residual solvents without causing membrane damage. This segmentation allows complete solvent removal while maintaining process control.
Solution Approach 2:
Before the final drying stage, a preliminary drying stage is performed to remove the majority of solvents. This preliminary action reduces the solvent load for the subsequent final drying stage, making the overall process more efficient and preventing discoloration by ensuring thorough solvent removal before the membrane is completed.
2Productivity
If high temperature drying is used to remove solvents quickly, then productivity increases, but the electrolyte membrane undergoes thermal degradation and discoloration
Solution Approach 1:
The drying process is divided into multiple temperature stages. The first stage uses higher temperature (e.g., 80-100°C) to rapidly remove most solvents, achieving high productivity. Subsequent stages use progressively lower temperatures (e.g., 60-80°C, then 40-60°C) to remove residual solvents without causing thermal degradation or discoloration of the membrane.
Solution Approach 2:
The drying process employs periodic action with alternating high-temperature and low-temperature stages. High-temperature periods rapidly evaporate solvents for productivity, while low-temperature periods allow controlled removal of residual solvents without damage, repeating this cycle to achieve both speed and quality.
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
This approach effectively removes residual solvents, preventing discoloration and enhancing fuel cell performance by maintaining the structural integrity and conductivity of the electrolyte membrane.
Implementation Method 1
drying the coating layer-formed substrate in the presence of a gas... During the drying, the one or more solvents different from the first solvent may be evaporated earlier than the first solvent
Implementation Method 2
The gas may include a first solvent and the solvent admixture may include the first solvent and one or more solvents different from the first solvent
Data Source
AI summary
Disclosed are an apparatus for manufacturing an electrolyte membrane and a method for manufacturing an electrolyte membrane using the same, which may prevent discoloration of the electrolyte membrane through a controlled drying process of the electrolyte membrane. The electrolyte membrane manufactured by the method of the present invention may not be discolored and performance and durability of fuel cells using the electrolyte membrane may be improved due to uniform drying of the electrolyte membrane during the manufacturing. For example, competitively simultaneous evaporation of solvents in an ionomer composition in the drying process may be prevented.