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
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  • 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 pollute

Method used

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  • 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

Example Embodiment

[0020] Example 1, using a porous PTFE film with a thickness of 30μm, a slit-like hole length of 5μm, and a slit width of 10 -1 μm, using corona charging: voltage is ±15kV, temperature is 100°C, energization time is 5min, electrode and film distance is 10cm, electrode is needle-shaped, 5 pieces are used.

Example Embodiment

[0021] In Example 2, a porous PTFE film is used, the film thickness is 90 μm, the slit-like hole length is 25 μm, and the slit width is 10 -1 μm, using corona charging: voltage is ±50kV, temperature is 300℃, energization time is 15min, electrode and membrane distance is 45cm, electrode is needle-shaped, and 15 pieces are used.

Example Embodiment

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

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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

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Application Information

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IPC IPC(8): B01D67/00B01D71/36B29C59/10
Inventor 夏钟福王飞鹏朱建伟
Owner TONGJI UNIV
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