Filter Medium With Hydrophilic Coating Resists Delamination
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Solution Overview
Problem
Current filter media face challenges in maintaining filtration performance and durability during backwashing due to hydrophobicity, contamination issues, and delamination, especially when treating water with positive ions and microbes, while also requiring improved water permeability and chemical resistance.
Innovation Solution
A filter medium with a hydrophilic coating layer and silver antibacterial layer, formed through electrospinning and lamination, which includes nanofibers and porous supports to enhance filtration efficiency and durability, and a positively charged coating layer for effective removal of contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure is applied to remove foreign substances from the filter medium, then filtration performance is improved, but the filter medium may be damaged or delamination may occur
Solution Approach 1:
The filter medium employs a composite structure consisting of a support layer and a nanofiber web layer with different functions. The support layer provides mechanical strength and structural stability to resist high pressure during backwashing, while the nanofiber web layer provides fine filtration performance. This composite material approach allows the filter medium to maintain both high filtration performance and structural integrity under high pressure conditions.
2Strength
If hydrophobic polymer materials are used to manufacture the filter medium, then chemical resistance and strength are improved, but filtration performance deteriorates and contamination becomes severe
Solution Approach 1:
The filter medium applies local quality by using hydrophobic polymer materials for the support layer to provide chemical resistance and mechanical strength, while using hydrophilic nanofiber materials for the nanofiber web layer to provide excellent filtration performance and prevent contamination. Each layer has optimized local properties suitable for its specific function, resolving the contradiction between chemical resistance and filtration performance.
3Stability of the object's composition
If the filter medium needs to maintain structural integrity during backwashing, then delamination is prevented, but flow path formation becomes difficult
Solution Approach 1:
The filter medium is segmented into multiple functional layers: a support layer for structural integrity and nanofiber web layers for flow path formation and filtration. During backwashing, the support layer maintains structural integrity and prevents delamination, while the nanofiber web layers with their porous structure facilitate flow path formation and maintain high flow rates. This segmentation allows simultaneous achievement of structural stability and high productivity.
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 solution provides improved filtration performance, durability, and antibacterial properties, ensuring high flow rates and quick water treatment while minimizing deformation and damage during backwashing, and effectively removing contaminants including positive ions and microbes.
Implementation Method 1
a hydrophilic coating layer formed on at least a part of an outer surface of the nanofibers and formed of a hydrophilic coating composition including a hydrophilic polymer compound
Implementation Method 2
The present invention is also directed to providing a filter medium having excellent antibacterial and disinfection properties
Implementation Method 3
improved filtration performance with respect to contaminants having negative ions such as microbes, an anionic compound, viruses, and the like
Data Source
AI summary
A filter medium according to one embodiment of the present invention comprises: a first support having a plurality of pores; a nanofiber web comprising nanofibers disposed on upper and lower portions of the first support and forming a three-dimensional network structure, and a hydrophilic coating layer formed on at least a part of an outer surface of the nanofibers, wherein the hydrophilic coating layer is formed of a hydrophilic coating composition comprising a hydrophilic polymer compound having at least one functional group selected from a hydroxyl group and a carboxyl group and a crosslinking agent comprising at least one sulfone group; and a second support having a plurality of pores interposed between the first support and the nanofiber web.