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Method of producing a porous membrane and waterproof, highly breathable fabric including the membrane

A porous membrane and fabric technology, applied in chemical instruments and methods, separation methods, transportation and packaging, etc., can solve the problem that the flow cannot be controlled by the pressure difference

Inactive Publication Date: 2006-09-20
程大酉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent also describes that since the pressure drop is so small that the flow cannot be controlled by the pressure difference, but only by the relative humidity and the porosity density of the membrane, whereby the low pressure drop is independent of the hot steam throughput

Method used

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  • Method of producing a porous membrane and waterproof, highly breathable fabric including the membrane
  • Method of producing a porous membrane and waterproof, highly breathable fabric including the membrane
  • Method of producing a porous membrane and waterproof, highly breathable fabric including the membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] PVDF powder with a solids content in the range of 10%-20% was dissolved in a mixing vessel with one of the solvents listed in Table I. PVDF is in powder form. In the case of a container equipped with a stirring device, the solvent is added to the powder and mixed. The solution should be stirred well until there is no sign of any solid powder. The solution is usually filtered through a fine mesh and drawn into a degassing vessel via a vacuum pump. Air is then introduced to compress the solution. This process was repeated until the liquid level did not rise under vacuum (due to outgassing).

[0117] The premix solution will have a very good shelf life if kept airtight to prevent any moisture from penetrating.

[0118] If the fabric will be coated, the fabric is pre-washed and all adhering particles and unwanted fine fibers are removed. Load the fabric onto the knife coater for coating. A solution of PVDF was fed into the knife coater as the fabric was pulled through...

Embodiment 2

[0120] The non-solvent is water and the solvent is eg DMSO or DMAC. This reduces the surface tension of the non-solvent and thus the rate of diffusion of the solvent from the solution.

Embodiment 3

[0122] Add the fabric at the end of the non-solvent bath where the solvent content is high. When it reaches the other end of the developing tank, the solvent concentration is about zero, so all solvent is removed from the fabric. The fabric is then added to a drying tent to remove any non-solvent. Solvent content was controlled by discharge from the fabric feed end of the tank.

[0123] Tests have shown that if the fabric feed is passed through a highly hydrophobic non-solvent bath, it will be under strong compression due to the wrinkling caused by the compressive force of the porous structure during gelation. Once it gels, the wrinkled surface will not stretch without some damage.

[0124] If the non-solvent bath is hydrophilic, the fabric still needs to be under a high enough tension to be able to relieve the stress of the porous structure once the fabric tension is removed.

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PUM

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Abstract

A method for creating a highly breathable and waterproof fabric based on hydrophobic plastic (such as PVDF) as a membrane layer. This new fabric allows higher water vapor throughput and better water resistance than other PVDF and ePTFE membranes. This is achieved through control of pore size, thus creating a spongy porous structure, pre-stressing to make the membrane and subsequent laminated fabric soft, and a microscopically folded structure which increases the surface area for the porous media, thus gaining higher throughput, waterproofness and comfort. In addition, the invention provides a method of controlling pore size distribution, increased porosity and pre-stress relief during the gelation proces.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application 60 / 480,143, filed June 19, 2003, based on 35 U.S.C. 119(e). technical field [0003] The present invention relates to processes for the preparation of porous polymer membranes, especially hydrophobic membranes, and to the products of these processes. In one important aspect, the present invention relates to a method of making a membrane comprising the use of a highly hydrophobic plastic as the porous layer and controlling the physical properties of the membrane such as pore size, density and prestressing properties (including flexibility) to produce a waterproof and highly breathable fabric, and thereby Fabricated. [0004] Highly breathable and waterproof fabric currently based on "Teflon"  Polymer film as hydrophobic layer, e.g. in "Gore-Tex"  In fabric, or on other materials such as polyurethane. "Teflon"  ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B02B3/00B01D71/06B01DB01D67/00B01D69/02B01D69/10B01D71/34D06N3/04D06N3/18
CPCB01D67/0016B01D2325/36B01D2323/12D06M2200/12B01D67/0009B01D2325/38Y10T428/249953B01D69/02D06N3/18B01D67/0011B01D69/10B01D71/34B01D2325/025D06N3/047D06N3/183B01D69/1071B01D67/00165
Inventor 程达毓
Owner 程大酉
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