An asymmetric ptfeporous membrane and its preparation method and use

By designing an asymmetric PTFE porous membrane structure, the problems of slow flow rate and insufficient mechanical properties of existing PTFE porous membranes are solved, achieving efficient retention and rapid flow filtration, making it suitable for a variety of industrial applications.

CN117018891BActive Publication Date: 2026-07-24HANGZHOU COBETTER FILTRATION EQUIPMENT CO LTD
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Patent Information

Application Number
CN202311046951.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-20
Publication Date
2026-07-24
Estimated Expiration
2043-08-20

AI Technical Summary

Technical Problem

Existing PTFE porous membranes have a symmetrical structure, which results in a slow flow rate while ensuring retention efficiency, leading to low economic benefits. Furthermore, the mechanical properties of the composite material are insufficient, especially in filtration applications where there is a risk of delamination.

Method used

An asymmetric PTFE porous membrane is designed with non-directional tortuous pathways and an integrally molded structure. The first outer surface has strip-shaped nodes and fiber distribution, and the second outer surface has dot-shaped nodes and retention fiber distribution. The average pore size is 0.5-20 μm and the thickness is 5-100 μm. By controlling the density, size and distribution of nodes and fibers, high retention efficiency and flow rate are ensured.

Benefits of technology

It achieves efficient retention of 1-15μm impurity particles, has a fast flow rate, and high mechanical strength. It is suitable for filtering stripping and etching solutions in semiconductor manufacturing processes, and is also suitable as a waterproof and breathable membrane for electronic and medical devices.

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Abstract

The application discloses an asymmetric PTFE porous membrane and a preparation method and application thereof, the porous membrane comprises a main body, one side of the main body is a first outer surface, and the other side is a second outer surface, the first outer surface comprises strip-shaped nodes and strip-shaped fibers, the strip-shaped fibers are distributed in a fishbone shape along the length direction of the strip-shaped nodes, the second outer surface comprises dot-shaped nodes and trapped fibers, and the trapped fibers are distributed in a radial shape along the circumferential direction of the dot-shaped nodes; the PTFE porous membrane is integrally formed; the PMI average pore diameter of the PTFE porous membrane is 0.5-20 mu m, and the thickness is 5-100 mu m; the PTFE porous membrane is an asymmetric membrane and is integrally formed, has high trapping efficiency, is relatively fast in flow rate, is suitable for filtering fluid in a short time, has good mechanical strength, has a wide application range, and is particularly suitable for being applied to the filtration of stripping liquid and etching liquid in a semiconductor process and being used as a waterproof and breathable membrane in electronic equipment and medical equipment; in addition, the application further provides a preparation method of the porous membrane, and the method is simple in operation.
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Citation Information

Patent Citations

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  • PTFE material with aggregations of nodes

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  • Asymmetry polypropylene porous film and process for producing same

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  • Preparation method of sub-high efficiency polytetrafluoroethylene (PTFE) micro-porous film and film lamination material

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