PFSA-Coated PTFE Membrane for Metal Scavenging
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Solution Overview
Problem
Porous PTFE membranes used in filtration applications lack metal scavenging efficiency while maintaining low flow resistance, especially in handling challenging fluids like corrosive or chemically active liquids.
Innovation Solution
A porous PTFE membrane with a non-crosslinked coating comprising perfluorosulfonic acid (PFSA) polymer, which has a critical wetting surface tension (CWST) of at least 30 dynes/cm, is used to filter metal-containing fluids, effectively removing metals and particles with minimal flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous PTFE membrane is used for filtration, then low flow resistance is achieved, but metal scavenging efficiency is insufficient
Solution Approach 1:
The patent applies composite materials by combining PTFE substrate with PFSA polymer coating to create a membrane that exhibits both low flow resistance and high metal scavenging efficiency. The composite structure integrates the hydrophobic, low-friction properties of PTFE with the metal-scavenging capabilities of PFSA, resolving the contradiction between flow resistance and metal removal efficiency
Solution Approach 2:
The patent implements local quality by applying a selective PFSA coating only on the surface of the PTFE membrane rather than throughout the entire structure. This localized modification provides metal scavenging functionality at the filtration interface while preserving the bulk PTFE's low flow resistance characteristics
2Reliability
If a coating is applied to improve metal scavenging, then metal removal efficiency increases, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the PFSA coating to achieve non-crosslinked structure with specific surface tension properties (至少30 dynes/cm). This parameter optimization enables effective metal removal while avoiding the complexity of cross-linking processes, simplifying manufacturing
Solution Approach 2:
The patent employs a disposable non-crosslinked PFSA coating that can be applied as a thin layer without requiring complex curing or cross-linking steps. This approach prioritizes functional effectiveness and ease of application over long-term durability, simplifying the manufacturing process
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 PFSA-coated PTFE membranes demonstrate high metal scavenging efficiency and low flow resistance, suitable for a wide range of filtration applications, including sterile and industrial uses, without the need for post-washing processes or cross-linking agents, ensuring dimensional stability and ease of integration into existing manufacturing processes.
Implementation Method 1
The filtering effect is explained by the sieving capture on the one hand and the Van der Waals interactions between the filter material and the particles on the other hand
Implementation Method 2
The filtering effect is explained by the sieving capture on the one hand and the Van der Waals interactions between the filter material and the particles on the other hand
Implementation Method 3
The filtering effect is explained by the sieving capture on the one hand and the Van der Waals interactions between the filter material and the particles on the other hand
Implementation Method 4
the membrane has a CWST of at least about 30 dynes/cm
Implementation Method 5
A porous PTFE membrane comprising a porous PTFE substrate having a non-crosslinked coating comprising perfluorosulfonic acid (PFSA) polymer
Data Source
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Figure 2
AI summary
A non-crosslinked PFSA coated porous PTFE membrane is disclosed.