PFA Composite Membrane for Semiconductor Wastewater
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Solution Overview
Problem
Current water treatment membranes lack porosity and resistance to high temperatures and strong acids, making them inadequate for semiconductor wastewater treatment, which requires efficient filtration under harsh conditions.
Innovation Solution
A porous composite membrane is developed by blending a fluorine-based polymer with an organic substance, such as polyvinylidene fluoride (PVDF) or perfluoromethyl alkoxy (MFA), in specific weight ratios, and processing the mixture through melt-extrusion to create pores without additional pore-forming processes, achieving porosity and thermal stability suitable for semiconductor wastewater treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine-based polymer membranes are used to achieve resistance to high temperatures and strong acids, then chemical stability is improved, but porosity is reduced making the membranes extremely dense
Solution Approach 1:
The patent combines fluorine-based polymer (PFA) with organic substance particles to create a composite membrane structure. The fluorine-based polymer provides the chemical stability and temperature resistance, while the organic substance particles create porosity when removed, resolving the contradiction between chemical durability and porosity
Solution Approach 2:
The patent intentionally incorporates organic substance particles as pore-forming agents that are later removed, creating a porous structure within the fluorine-based polymer matrix. This allows the membrane to maintain both chemical stability from the polymer and porosity for filtration functionality
2Manufacturing precision
If ceramic materials are used to achieve precise porosity control, then porosity control is improved, but processability deteriorates making them prone to breaking and cracking
Solution Approach 1:
The patent changes the material parameter from brittle ceramic to flexible fluorine-based polymer, fundamentally altering the mechanical properties while maintaining porosity control through the composite structure approach. This allows easy processing without breaking or cracking
Solution Approach 2:
By using organic substance particles within the polymer matrix as pore-forming agents, the patent achieves precise porosity control comparable to ceramic materials while maintaining the processability and flexibility of polymer materials
3Reliability
If single-component fluorine-based polymer membranes are used to achieve chemical stability, then resistance to strong acids is improved, but porosity is reduced making additional pore-forming processes necessary
Solution Approach 1:
The patent incorporates organic substance particles into the polymer matrix during the initial mixing stage, before membrane formation. These particles serve as pre-positioned pore-forming agents that will be removed later, eliminating the need for separate pore-forming processes
Solution Approach 2:
The composite structure of fluorine-based polymer and organic substance particles allows porosity to be built into the membrane during manufacturing, combining chemical stability with inherent porosity without requiring additional processing steps
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 resistance to high temperatures and strong acids, with controlled porosity and pore size, enabling effective wastewater treatment and reducing reliance on imported membrane technologies.
Implementation Method 1
processing the mixture through melt-extrusion to create pores without additional pore-forming processes
Data Source
AI summary
There are provided a porous composite membrane formed by blending perfluoroalkoxy alkane (PFA) with an organic substance, and a manufacturing method thereof. The porous composite membrane is able to have pores easily formed simply by blending a fluorine-based polymer with an organic substance without additional pore-forming processes such as stretching and heating, and exhibit excellent properties in terms of resistance to high temperatures and strong acids due to the use of the fluorine-based polymer as a base material, so it is available for use in semiconductor wastewater treatment that uses strong acids like HF.