Fluorinated Filter Membrane With Thermally Stable Ionic Groups
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Solution Overview
Problem
Filtration membranes made from fluoropolymers face challenges in incorporating thermally stable ionic groups, which are necessary for effective filtration but degrade at high temperatures used in the potting process, making it difficult to create stable filters for high-temperature and corrosive applications like microelectronic device processing.
Innovation Solution
A filtration membrane with a porous fluoropolymer and thermally stable ionic groups is developed, where the ionic groups are integrated through surface modification or coating, allowing them to withstand high-temperature processing steps without degradation, and a fluid-tight seal is achieved by potting the membrane with a melt-processable fluoropolymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermally unstable ionic groups are incorporated into the filtration membrane, then filtration effectiveness is improved, but the membrane cannot withstand high-temperature potting processes
Solution Approach 1:
The patent changes the thermal stability parameter of ionic groups by selecting specific chemically inert porous substrates (PTFE, PFA, FEP, ETFE) that can withstand high temperatures, and by choosing ionic groups with appropriate thermal stability characteristics. This parameter change enables the membrane to endure potting processes at elevated temperatures while maintaining filtration effectiveness.
Solution Approach 2:
The patent creates a composite structure combining chemically inert porous fluoropolymer substrates with thermally stable ionic groups. This composite material approach allows the membrane to simultaneously achieve high thermal stability from the fluoropolymer matrix and effective filtration from the ionic groups, resolving the contradiction between thermal withstand capability and filtration performance.
2Reliability
If the filtration membrane is modified to include ionic groups, then impurity removal capability is enhanced, but the chemical inertness of fluoropolymer is compromised
Solution Approach 1:
The patent applies local quality by introducing ionic groups at specific locations on the fluoropolymer substrate surface rather than throughout the bulk material. This localized modification enables impurity removal enhancement at the filtration interface while preserving the overall chemical inertness of the fluoropolymer matrix, as the bulk material remains unchanged.
Solution Approach 2:
The patent uses chemically inert porous fluoropolymer substrates as intermediaries that host ionic groups without themselves participating in chemical reactions. The fluoropolymer acts as a stable carrier that provides both the structural framework and the platform for ionic group functionality, maintaining chemical inertness while enabling enhanced impurity removal through the ionic groups.
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 enables the creation of stable filters that can effectively remove impurities and metals from fluids at elevated temperatures, maintaining filtration efficiency and durability, even under harsh conditions.
Implementation Method 1
The thermoplastic material is contacted with the filtration membrane edge and with the support surface, is melted or softened, and is caused to flow
Implementation Method 2
Filtration membranes and filter products are indispensable tools of modern industry, used to separate unwanted materials from useful materials from fluid materials
Data Source
AI summary
Described are filtration membranes that include a porous fluoropolymer membrane and thermally stable ionic groups; filters and filter components that include these filtration membranes; methods of making the filtration membranes, filters, and filter components; and method of using a filtration membrane, filter component, or filter to remove unwanted material from fluid.