Method for preparation of polytetrafluorethylene microporous film for the processing of high-temperature fume and flour dust

A polytetrafluoroethylene, high temperature flue gas technology, applied in chemical instruments and methods, separation methods, membrane technology and other directions, can solve problems such as complex processing, and achieve uniform distribution, significant economic and social benefits, and uniform efficiency.

Inactive Publication Date: 2007-12-05
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is slightly more complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Mixing: mix polytetrafluoroethylene resin powder (Dakin F106 in Japan) and catalyst powder uniformly by weight percentage 1:0.01, then add liquid paraffin (the weight ratio of polytetrafluoroethylene resin powder to liquid paraffin is 1:0.2) mix evenly, stand at a temperature of 20°C for 144 hours, then stand at a temperature of 40°C for 10 hours, so that the resin powder and the liquid lubricant are fully mixed to form a polytetrafluoroethylene material;

[0021] 2. Compacting and calendering: press the polytetrafluoroethylene material on a compacting machine at 20°C to form a cylindrical blank, extrude the blank into a rod at a temperature of 40°C through a pusher, and then calender The machine is calendered at 40°C to form a PTFE base tape;

[0022] 3. Longitudinal stretching: stretch the polytetrafluoroethylene base tape longitudinally in an oven at 180°C to obtain a degreased base tape;

[0023] 4. Transverse stretching and heat setting: Stretch the degreased b...

Embodiment 2

[0026] 1. Mixing: Mix polytetrafluoroethylene resin powder (Dakin F106) and catalyst powder uniformly in a percentage by weight of 1:0.06, then add petroleum ether (the weight ratio of polytetrafluoroethylene resin powder to petroleum ether is 1:0.25) and mix evenly, stand at a temperature of 30°C for 121 hours, and then stand at a temperature of 60°C for 12 hours, so that the resin powder and the liquid lubricant are fully mixed to form a polytetrafluoroethylene material;

[0027] 2. Compacting and calendering: press the polytetrafluoroethylene material on a compacting machine at 25°C to form a cylindrical blank, and extrude the blank into a rod at a temperature of 50°C through a pusher, and then calender The machine is calendered at 50°C to form a PTFE base tape;

[0028] 3. Longitudinal stretching: stretch the polytetrafluoroethylene base tape longitudinally in an oven at 250°C to obtain a degreased base tape;

[0029] 4. Transverse stretching and heat setting: Stretch the...

Embodiment 3

[0032] 1. Mixing: Mix polytetrafluoroethylene resin powder (CD123 of Japan Asahi Glass Co., Ltd.) and catalyst powder uniformly by weight percentage 1:0.04, then add kerosene (the weight ratio of polytetrafluoroethylene resin powder to kerosene is 1:0.28 ) mixed evenly, standing at a temperature of 40°C for 144 hours, and then standing at a temperature of 80°C for 16 hours, so that the resin powder and the liquid lubricant are fully mixed to form a polytetrafluoroethylene material;

[0033] 2. Compacting and calendering: press the polytetrafluoroethylene material on a compacting machine at 30°C to form a cylindrical blank, and extrude the blank into a rod at a temperature of 60°C through a pusher, and then calender The machine is calendered at 60°C to form a PTFE base tape;

[0034] 3. Longitudinal stretching: stretch the polytetrafluoroethylene base tape longitudinally in a 300°C oven to obtain a degreased base tape;

[0035] 4. Transverse stretching and heat setting: Stretc...

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Abstract

The present invention discloses one kind of microporous teflon film for treating high temperature fume and dust and its preparation process. The preparation process includes mixing powdered teflon resin and powdered catalyst, adding liquid lubricant to the mixture, extruding, rolling, longitudinally stretching, transversely stretching, heat setting and other steps. The microporous teflon film for treating high temperature fume and dust has simple preparation process and low cost. It has pore size of 0.5-5 micron and dioxins eliminating rate at 200 deg.c as high as 95-98 %. It may be applied widely for high temperature tail gas treatment in refuse burning treatment plant, refuse burning power plant, coal burning power plant, cement mill, etc.

Description

technical field [0001] The invention relates to the technical field of filter materials, in particular to providing a method for preparing a polytetrafluoroethylene microporous film for high-temperature flue gas and dust treatment. Background technique [0002] At present, air pollution has become an increasingly serious global problem, and the emission and control of dioxins, furans, nitrogen oxides, sulfides and other waste gases have attracted the attention of countries all over the world. Activated carbon adsorption is a common treatment at home and abroad. Although it has a good removal efficiency, it will be deactivated after long-term use of activated carbon. For dioxin gas, only the gaseous dioxin is transferred to the solid phase, and the dioxin still exists in the fly ash. If it is not disposed of properly, the problem of secondary pollution is very likely to occur. [0003] In recent years, catalyst decomposition technology has been paid more and more attention. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D53/86
Inventor 郭玉海来侃孙润军张华鹏张建军陈建勇冯新星
Owner ZHEJIANG SCI-TECH UNIV
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