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Polytetrafluoroethylene composite membrane and preparation method thereof

A technology of polytetrafluoroethylene and polytetrafluoroethylene layer, which is applied in the field of composite film and its preparation, can solve the problems of limiting the application range of composite film, low peeling strength of composite film, short service life, etc., and achieves high viscosity and increased use The effect of life and increase in peel strength

Active Publication Date: 2011-05-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the hot-melt bonding method is used to prepare polytetrafluoroethylene composite membranes. There is a difference in surface tension between the support layer and the polytetrafluoroethylene layer. It is difficult for the adhesive used to bond the support layer and polytetrafluoroethylene. The vinyl fluoride layer is closely combined, so that the prepared composite film has low peel strength, easy to separate, and short service life
In addition, the low air flow rate of the polytetrafluoroethylene composite membrane prepared by the hot melt bonding method limits the application range of the composite membrane.

Method used

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  • Polytetrafluoroethylene composite membrane and preparation method thereof
  • Polytetrafluoroethylene composite membrane and preparation method thereof

Examples

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preparation example Construction

[0045] The present invention also provides a preparation method of a polytetrafluoroethylene composite membrane, comprising: a) dissolving a porous polymer and an additive in a solvent to prepare a polymer solution; the weight ratio of the porous polymer, solvent, and additive is 15 ~20:10~15:50~70;

[0046] b) providing a support layer and a polytetrafluoroethylene layer;

[0047] c) coating the polymer solution on the surface of the support layer, and compounding the polytetrafluoroethylene layer on the surface to obtain a nascent film

[0048] d) immersing the nascent film prepared in c) in a gel bath, and solidifying the polymer solution to form an adhesive layer to obtain a polytetrafluoroethylene composite film.

[0049] According to the present invention, the porous polymer and the additive are dissolved in a solvent to obtain a polymer solution. Due to the high viscosity of the polymer solution, defoaming treatment is preferably performed on it, and the treatment time...

Embodiment 1

[0059] Dissolve 20g of polysulfone and 10g of polyvinylpyrrolidone in 50g of dimethylacetamide to form a polymer solution. After the polymer solution was allowed to stand for defoaming for 24 hours, the polymer solution was cast onto a polyethylene terephthalate non-woven support layer, and the film was scraped with a scraper with a gap of 10-20 μm between the scrapers. Spread the porous vinyl fluoride film on the surface of the scraped adhesive layer solution, flatten it with a round roller, immediately immerse it in water at 40°C for curing, and after 2 minutes, wash it in water at 70°C for 3 minutes, take it out and dry it to obtain polytetrafluoroethylene porous composite membrane. The polytetrafluoroethylene composite membrane was subjected to gas flux detection and peel strength detection.

[0060] Gas flux detection:

[0061] When the air relative humidity is 50%, the gas flux detection of the polytetrafluoroethylene composite membrane prepared by using a gas permeati...

Embodiment 2

[0067] Dissolve 15g of polyethersulfone, 5g of polyethylene glycol and 10g of polyvinylpyrrolidone in 50g of dimethylformamide to form a polymer solution. After the polymer solution was allowed to stand for defoaming for 24 hours, the polymer solution was cast onto a polyethylene terephthalate non-woven support layer, and the film was scraped with a scraper with a gap of 10-20 μm between the scrapers. Spread the porous vinyl fluoride film on the surface of the scraped adhesive layer solution, flatten it with a round roller, immediately immerse it in water at 40°C for curing, and after 2 minutes, wash it in water at 60°C for 3 minutes, take it out and dry it to obtain polytetrafluoroethylene porous composite membrane. The polytetrafluoroethylene composite membrane was subjected to gas flux detection and peel strength detection.

[0068] According to the method of Example 1, the polytetrafluoroethylene composite membrane prepared in Example 2 is tested for gas flux, peel streng...

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Abstract

The invention provides a polytetrafluoroethylene composite membrane. The polytetrafluoroethylene composite membrane comprises a supporting layer, a polytetrafluoroethylene layer, and a bonding layer for bonding the supporting layer and the polytetrafluoroethylene layer, wherein the supporting layer is one or more of a polypropylene non-woven fabric, a polyester non-woven fabric, and a nylon membrane; and the bonding layer comprises a porous polymer, a solvent and an additive, and the weight ratio of the porous polymer to the solvent to the additive is (15-20):(10-15):(50-70). In polytetrafluoroethylene composite membrane, the porous polymer has uniform pores and high viscosity, and can permeate into the supporting layer and the polytetrafluoroethylene layer, and a hinge structure between the supporting layer and the polytetrafluoroethylene layer is formed after the solidification to fix the supporting layer and the polytetrafluoroethylene layer so as to increase the peeling strength of the composite membrane and improve the service life of the composite membrane. The invention also provides a preparation method of the polytetrafluoroethylene composite membrane; the process conditions are mild; and the method is suitable for mass production.

Description

technical field [0001] The invention relates to the field of composite membrane and its preparation, in particular to a polytetrafluoroethylene composite membrane and its preparation method. Background technique [0002] With the advancement of science and technology, various manufacturing technologies are becoming more and more advanced, and the requirements for the manufacturing environment are also getting higher and higher, such as semiconductor industry, biopharmaceutical industry, precision laboratories such as molecular biology, medicine and precision manufacturing In the production and research process of industry, etc., the requirements for air cleanliness are very strict, so it is necessary to use air filtration and purification equipment to remove tiny particles and improve the air cleanliness of the production and scientific research environment. [0003] PTFE has the characteristics of good chemical stability, thermal stability, hydrophobicity and flame retardan...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D69/12B01D69/10
Inventor 李胜海张所波张奇峰毕伟辉
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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