Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing porous filter membrane of polytetrafluoroethylene electret

A technology of polytetrafluoroethylene and filter membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of novel concept and simple structure

Inactive Publication Date: 2004-09-15
TONGJI UNIV
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such filter systems are only suitable for cleaning polluted air and gases
So far, using the above-mentioned advantages of electrets, the efficient purification of polluted medium liquids, such as gasoline (especially for aviation and aerospace and other high-tech fields), transformer oil and silicone oil, has not been seen in the world. to report

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing porous filter membrane of polytetrafluoroethylene electret
  • Method for preparing porous filter membrane of polytetrafluoroethylene electret
  • Method for preparing porous filter membrane of polytetrafluoroethylene electret

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, adopt porous PTFE film, film thickness is 30 μ m, and the length of slit-like hole is 5 μ m, and slit width is 10 -1 μm, using corona charging: the voltage is ±15kV, the temperature is 100°C, the power-on time is 5min, the distance between the electrode and the film is 10cm, the electrodes are needle-shaped, and 5 electrodes are used.

Embodiment 2

[0021] Embodiment 2, adopt porous PTFE film, film thickness is 90 μ m, and the length of slit-like hole is 25 μ m, and slit width is 10 -1 μm, using corona charging: the voltage is ±50kV, the temperature is 300°C, the power-on time is 15min, the distance between the electrode and the film is 45cm, the electrodes are needle-shaped, and 15 electrodes are used.

Embodiment 3

[0022] Example 3, using a porous PTFE film with a film thickness of 70 μm, a slit-like hole length of 35 μm, and a slit width of 1.5 μm, using corona charging: the voltage is ±30 kV, the temperature is 250 ° C, and the electrification time is 20 minutes. The membrane distance is 25cm, and the electrodes are needle-shaped, with 280 electrodes.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a teflon electret multihole filter membrane preparing method, adopting corona or electron beam charging to change permeability of teflon filter membrane, and adjusting voltage (namely needle membrane electric field), charge time, electrifying time and needle membrane distance to change permeability of the filter membrane, so as to realize the filter membrane with different cell sizes and apertures, applied to medium liquid with different grain sized pollutants. It can very effectively purify polluted medium liquids such as gasoline, transformer oil and silicon oil.

Description

technical field [0001] The invention belongs to the field of ultra-purification engineering (or environmental protection technology), and in particular relates to a preparation method of a polytetrafluoroethylene electret porous filter membrane. Background technique [0002] In recent years, especially in the past ten years, gas or air filters developed with electret non-woven fabrics, electret fiber membranes and porous membranes have been widely used in various air conditioning purification systems, including central air conditioning and household air conditioning , as well as microelectronics workshops and optical engineering workshops that require high-precision purification. Compared with traditional mechanical blocking air filters or externally biased high-voltage electrostatic filters, they are energy-saving (low flow resistance, such as air flow resistance is only 1 / 9 of mechanical air filters), no external power supply system is required, and strong The characteris...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D67/00B01D71/36B29C59/10
Inventor 夏钟福王飞鹏朱建伟
Owner TONGJI UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com