Anion-exchange membrane and manufacturing method therefor
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Solution Overview
Problem
Existing anion-exchange membranes face limitations in chemical resistance, ion exchange capacity, and sheet resistance, particularly when exposed to highly concentrated acids and alkalines, restricting their applicability in certain processes.
Innovation Solution
An anion-exchange membrane comprising a porous polymer support with anion-exchange polymer uniformly distributed on its surface and inside pores, formed from a crosslinked monomer, offering high ion exchange capacity and low sheet resistance, achieved through a manufacturing process involving impregnation, lamination, and crosslinking with UV irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrocarbon-based anion-exchange membranes are used to reduce cost, then cost is reduced, but chemical resistance deteriorates
Solution Approach 1:
The patent uses a composite structure combining a porous polymer support (hydrocarbon-based for cost-effectiveness) with a perfluorinated anion-exchange polymer coating (for superior chemical resistance). This composite approach allows the membrane to achieve the chemical resistance of expensive perfluorinated membranes while maintaining the cost advantages of hydrocarbon-based supports.
2Reliability
If perfluorinated anion-exchange membranes are used to improve chemical resistance, then chemical resistance is improved, but cost increases
Solution Approach 1:
Instead of making the entire membrane from expensive perfluorinated material, the patent applies perfluorinated anion-exchange polymer only as a coating layer on the porous support surface and within its pores. This local application of high-performance material provides the necessary chemical resistance at the critical interfaces while minimizing overall material cost.
3Strength
If support fraction is increased to improve mechanical strength, then mechanical strength is improved, but ion exchange capacity deteriorates
Solution Approach 1:
The patent utilizes a porous polymer support structure that provides mechanical strength through its three-dimensional network architecture while maintaining high porosity (30-80%). The porous structure allows maximum infiltration of anion-exchange polymer into the pores, ensuring high ion exchange capacity without requiring excessive support material that would block ion transport pathways.
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 membrane exhibits excellent chemical resistance, high ion exchange capacity, and low sheet resistance, enabling effective use in systems like electrodialysis and water electrolysis under harsh conditions.
Implementation Method 1
irradiating light onto the laminate and subjecting the composition to a crosslinking reaction to form, on the surface and in the pores of the porous polymer support, an anion-exchange polymer that is a crosslinked product of the composition
Implementation Method 2
an anion-exchange membrane is a synthetic resin membrane that selectively transmits anions by virtue of positively charged functional groups
Data Source
AI summary
Disclosed are an anion-exchange membrane and a manufacturing method therefor. The anion-exchange membrane may include: a porous polymer support composed of a membrane structure; and an anion-exchange polymer, wherein the anion-exchange polymer may be present on a surface and in pores of the porous polymer support, anion-exchange groups of the anion-exchange polymer may be uniformly distributed on the surface and in the pores of the porous polymer support, and the anion-exchange polymer may be a crosslinked product of a composition including a crosslinkable monomer represented by Formula 1:wherein X− is as disclosed in the specification.