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Non symmetrical porous polytetrafluoro membrane for clothing material

A polytetrafluoroethylene film, asymmetric technology, applied in the field of materials for clothing, can solve the problem of bonding strength, can not meet the water resistance, air permeability and water vapor transmission capacity, and reduce the bonding force and film performance. And other issues

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

AI Technical Summary

Problems solved by technology

[0004] When the porous PTFE membrane produced by the above method is used as a laminating agent for clothing materials, the air permeability is good, but there is a problem that the lipids of the human body accumulate in the porous membrane, which reduces the performance of the membrane.
However, there is a problem with the bonding strength between the two, and the durability problem as a material for clothing has not been solved.
[0007] Among the symmetrical porous PTFE described above, there is no material for clothing that satisfies water resistance, air permeability, water vapor permeability, and adhesive force.

Method used

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  • Non symmetrical porous polytetrafluoro membrane for clothing material
  • Non symmetrical porous polytetrafluoro membrane for clothing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0107] Extrude the pasty mixture of 80 parts by weight of PTFE fine powder and 20 parts by weight of naphtha produced by emulsion polymerization with an extruder at a reduction ratio of 80:1 to obtain 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, ...

Embodiment 4～6

[0113] A polyester / cotton (50 / 50%) blended fabric having a thickness of about 0.1 mm was laminated on one side of the asymmetric porous PTFE membrane produced in Examples 1 to 3 to obtain a clothing material. The lamination process uses moisture-permeable hot-melt polyurethane as an adhesive, coats it on the surface of the asymmetric porous PTFE membrane, and then sticks the blended fabric on it, and then, through Finish by hardening the polyurethane adhesive. Table 2 shows the evaluation results of water vapor permeability and air permeability before and after dry cleaning.

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Abstract

An asymmetrical porous polytetrafluoroethylene (PTFE) membrane for fabric 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 chcaracteristics, and improved water vapor permeability and adhesion to fabric.

Description

technical field [0001] The present invention relates to an asymmetric porous polytetrafluoroethylene film for clothing and a material for clothing using the film as an air-permeable and water-repellent film. 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. In order to keep the shape of the stretched porous PTFE membrane, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B01D67/00B01D69/02B01D69/10B01D71/36B29C35/04B29C35/16B29C55/00B29C59/16B29C71/02B32B5/32
CPCY10T442/678Y10T442/674Y10T442/3325B01D67/0083Y10T442/2861B29C71/02B29K2027/18B29C2035/1616B29C2035/046Y10T442/3886Y10T442/2762Y10T442/2041B29L2031/755Y10T442/3854B29C55/005Y10T442/647Y10T442/2139B01D71/36Y10T442/2221Y10T442/3366B01D69/02B32B5/32Y10T442/3862B29C59/16B29K2105/04B01D69/10Y10T442/675B01D69/1071B32B2315/085B32B2305/026B32B9/047B32B2262/062B32B5/022B32B5/024B32B2262/0276B32B2327/18B32B2317/10B32B9/02B32B5/26
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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