Vacuum Chamber Bipolar Electrode Polymer Coating
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Solution Overview
Problem
Existing methods for forming bi-polar electrodes with ion exchange polymers on opposite faces of a porous substrate are not efficient, as they lack a systematic approach for simultaneous application and polymerization of dissimilar ion exchange polymers, leading to suboptimal performance in water purification through passive deionization.
Innovation Solution
A method involving an electrode substrate with activated carbon layers on opposite faces, where gaskets create airtight chambers for separate polymerizable monomer mixtures with anion and cation exchange groups to be polymerized simultaneously, preventing oxygen hindrance and ensuring smooth surface polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate application methods are used for ion exchange polymers on opposite faces, then each polymer can be applied independently, but the process time and complexity increase
Solution Approach 1:
The patent combines the application of two different ion exchange polymers (cation-exchange and anion-exchange) onto opposite faces of a single porous electrode substrate in one simultaneous operation. The porous substrate serves as a common support structure that allows both polymers to be applied at the same time, merging what would traditionally be separate sequential steps into a single integrated process, thereby reducing total process time while maintaining independent control over each polymer type.
Solution Approach 2:
The patent segments the electrode substrate into two distinct faces, each receiving a different ion exchange polymer. The porous structure of the substrate is divided into two functional zones with opposite polarities, allowing simultaneous but separate polymer application on each face. This segmentation enables independent optimization of each polymer layer while maintaining overall process efficiency.
2Reliability
If ion exchange polymers are applied to porous substrate, then deionization performance improves, but oxygen hindrance causes poor polymerization quality
Solution Approach 1:
The patent employs a vacuum environment to remove oxygen from the porous substrate before and during polymer monomer application. By creating an oxygen-free (inert) atmosphere within the porous structure, the polymerization process is protected from oxygen inhibition, which would otherwise cause poor polymerization quality and defective coating formation. This allows high-quality polymerization to proceed while maintaining the porous structure's deionization functionality.
Solution Approach 2:
The patent performs preliminary vacuum treatment to evacuate oxygen and air from the porous substrate before introducing the polymer monomers. This preliminary action of removing oxygen beforehand prevents oxygen hindrance during the subsequent polymerization process, ensuring smooth and high-quality polymer coating formation on the porous surface while preserving the substrate's ion exchange capabilities.
3Manufacturing precision
If monomers are added to vacuum chamber, then polymerization proceeds smoothly, but system complexity increases
Solution Approach 1:
The patent uses a single vacuum chamber that serves multiple functions: it acts as the reaction vessel for monomer addition, provides the oxygen-free environment for polymerization, and facilitates the entire coating process. This multi-functional vacuum chamber design achieves smooth polymerization without requiring separate complex systems for each function, as the vacuum chamber integrates environmental control, reaction containment, and process management in one device.
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 method enables the efficient formation of bi-polar electrodes with simultaneous ion exchange polymer coatings on opposite faces, enhancing the operational efficiency of the electrodes in water purification by effectively blocking ions of opposite polarity, thus improving the deionization process.
Implementation Method 1
A vacuum is formed in the first and second chambers
Implementation Method 2
The first and second polymerizable monomer mixtures are then polymerized in an oven
Implementation Method 3
each layer possesses ion exchange functionality that operates to transport one type of ion across the material in an electric field, while substantially or effectively blocking most ions of the opposite polarity
Data Source
Figure 1
AI summary
A bi-polar electrode having ion exchange polymers on opposite faces (13A, 13B) of a porous substrate is formed using a method that includes providing an electrode substrate (12) with activated carbon layers on opposite faces (13A, 13B) of the electrode substrate (12), wherein said faces have an outer perimeter band (14) void of the activated carbon layers. Gaskets (16A, 16B) are placed against the outer perimeter band (14) of the electrode substrate (12) void of activated carbon and the electrode substrate (12) is clamped between two rigid plates (18A, 18B) to form a first airtight chamber (20A) on one side (15A) of the electrode substrate (12) and a second airtight chamber (20B) on the opposite side (15B) of the electrode substrate (12). A first polymerizable monomer mixture having an anion exchange group is added into the first chamber (20A) and a second polymerizable monomer mixture having a cation exchange group is added into the second chamber (20B). The first and second polymerizable monomer mixtures are then polymerized in an oven.