Non symmetrical multihole polytetrafluloethylene membrane for filter

A polytetrafluoroethylene membrane, asymmetric technology, applied in the direction of filtration separation, application, membrane technology, etc., can solve the problems of insufficient ventilation and collection efficiency

Active Publication Date: 2004-10-06
YEU MING TAI CHEM INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are also many documents mentioning that the porous PTFE membrane made is used as a filter, but there are so-called insufficient problems of air permeability and collection efficiency (for example, referring to U.S. Patent No. 5,234,739 specifications, U.S. Patent No. 5,395,429 No. specification and US Patent No. 5409515 specification)

Method used

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  • Non symmetrical multihole polytetrafluloethylene membrane for filter
  • Non symmetrical multihole polytetrafluloethylene membrane for filter

Examples

Experimental program
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Embodiment 1～3

[0104]Extrude the pasty mixture of 80 weight units of PTFE fine powder and 20 weight units of naphtha produced by emulsion polymerization with an extruder at a reduction ratio of 80:1 to become a rod-shaped extrudate with a diameter of 18 mm. The rod-shaped extruded product was rolled in the same direction as the extrusion direction with a calender roll having a diameter of 500 mm, to obtain a plate-shaped rolled product having a width of 260 mm and a thickness of 0.2 mm. The naphtha was removed by heating the plate to 260°C in an oven. Next, after preheating the sheet to 300° C., simultaneous biaxial stretching was carried out at a stretch ratio of 500% in the rolling direction and at a ratio of 300% in a direction perpendicular thereto. While maintaining this stretched state, it was heated at 340° C. for 15 seconds to complete heat setting. Thereafter, it was cooled to room temperature, and the thickness of the prepared symmetrical porous PTFE membrane was 20-25 μm, the max...

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Abstract

An asymmetrical porous polytetrafluoroethylene (PTFE) membrane for filter is composed of high-compactness surface layer and continuous air bubble type porous layer. Its advantages are small ageing change, low water permeability, good sealing and electric characteristics, improved gas permeability and collecting efficiency, and less pressure loss.

Description

technical field [0001] The invention relates to an asymmetric porous polytetrafluoroethylene membrane for a filter. In addition, it relates to a material for a filter comprising an asymmetric porous polytetrafluoroethylene membrane for a filter and a reinforcing material. Background technique [0002] Porous polytetrafluoroethylene membrane (hereinafter referred to as porous PTFE membrane) has good chemical resistance and high tensile strength, so it is not only used in manufacturing equipment and piping in the fields of chemicals, food, semiconductors, etc. Seals, gaskets, etc., are also widely used in filters for gas and liquid filtration, breathable and water-impermeable membranes for clothing, and medical films. [0003] Generally, the mixture of PTFE fine powder and naphtha and other extrusion aids, that is, PTFE paste, is extruded and rolled. Next, after removing the extrusion aid from the rolled product, stretching is performed in a uniaxial or biaxial direction. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B01D67/00B01D69/02B01D69/10B01D71/36B29C35/04B29C35/16B29C55/00B29C59/16B29C71/02B32B5/32C08J9/36
CPCB01D39/1692Y10T428/249986Y10T428/249978B01D67/0083B29C71/02B01D71/36B29K2027/18B29C2035/1616B29C2035/046Y10T428/24998B01D69/02B32B5/32B29C59/16B29L2031/755B29C55/005B29K2105/04B01D69/10B32B5/18B32B2327/18B32B2266/025B32B2305/026B32B2315/085B01D69/108B01D69/1071
Inventor 黄雅夫周钦俊周钦杰赖君义李魁然王大铭阮若屈吴添财
Owner YEU MING TAI CHEM INDAL
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