Ion Exchange Resin Crosslinked Structure for Electrodialysis Membranes
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Solution Overview
Problem
Current electrodialysis systems face issues with membrane swelling and deformation due to excessive ion introduction, leading to reduced desalination efficiency and water leakage, which compromises the performance and lifespan of ion exchange membranes.
Innovation Solution
Development of an ion exchange resin with a crosslinked structure formed by reacting an epoxy resin with an ionic monomer or polymer having sulfonate ions, combined with a crosslinking agent, to create a network structure that enhances chemical resistance and reduces swelling, suitable for use in electrodialysis membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more ions are introduced to the membrane to maintain high-performance electrochemical properties of the EDR system, then the electrochemical performance is improved, but the membrane swells excessively, loses strength, and shows poor chemical resistance
Solution Approach 1:
The patent changes the chemical composition parameters of the membrane by incorporating epoxy resin (15-25 parts by weight) and ionic compounds with sulfonate ions (40-80 parts by weight) in specific ratios, creating a crosslinked structure that maintains electrochemical performance while reducing excessive swelling and improving chemical resistance
Solution Approach 2:
The patent creates a composite membrane material combining epoxy resin and ionic compounds with sulfonate ions to form a crosslinked network structure. This composite structure provides both the electrochemical performance needed for EDR operation and the mechanical strength to resist excessive swelling and chemical degradation
2Productivity
If more ions are introduced to the membrane for EDR operation, then ion transport capability is improved, but the membrane swells and deforms, causing water leakage and reduced desalination efficiency
Solution Approach 1:
The patent modifies the membrane's chemical composition by introducing epoxy resin and ionic compounds with sulfonate ions in optimized ratios, creating a crosslinked structure that maintains ion transport capability while preventing excessive swelling and deformation that would compromise dimensional stability
Solution Approach 2:
Instead of allowing the membrane to swell freely with ion introduction, the patent uses crosslinking to invert the expected behavior - the membrane structure is designed to resist swelling while still permitting necessary ion transport for EDR operation
3Power
If a salt solution is used to maintain ion balance in the EDR system, then electrical field effectiveness is improved, but the membrane experiences excessive swelling and deformation over time
Solution Approach 1:
The patent changes the membrane's chemical structure parameters by incorporating epoxy resin and ionic compounds with sulfonate ions in specific proportions, creating a crosslinked network that maintains electrical field effectiveness while extending membrane lifespan through reduced swelling and improved chemical resistance
Solution Approach 2:
The patent applies crosslinking beforehand to create a protective network structure that cushions against the harmful effects of ion-induced swelling and chemical degradation, preventing membrane deformation and extending operational lifespan before these problems can occur
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 resulting ion exchange resin films exhibit excellent chemical resistance, low swellability, and improved desalination efficiency, preventing deformation during operation and extending the lifespan of electrodialysis modules.
Implementation Method 1
an ion exchange resin with a crosslinked structure formed by reacting an epoxy resin with an ionic monomer or polymer having sulfonate ions, combined with a crosslinking agent, to create a network structure that enhances chemical resistance and reduces swelling
Implementation Method 2
The cations (positive ions) and anions (negative ions) in the water are separated through the cation exchange membrane and the anion exchange membrane
Implementation Method 3
Under the influence of an external electric field, the movement of ions in the water is driven by a positive direct current and a negative direct current
Data Source
AI summary
An ion exchange resin and a method for preparing the same are provided. An ion exchange resin is formed by a composition, and the composition includes a crosslinking agent and an ionic compound with sulfonate ions. The ionic compound with sulfonate ions is formed by reacting an epoxy resin with an ionic monomer with sulfonate ions or an ionic polymer having sulfonate ions. The ionic monomer and the ionic polymer each has a hydroxyl group or an acid group at the ends. The ionic monomer or the ionic polymer is 40 to 80 parts by weight, and the epoxy resin is 15 to 25 parts by weight, based on 100 parts by weight of the ion exchange resin. An ion exchange resin with a network structure is formed after the ionic compound with sulfonate ions reacts with the crosslinking agent.