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A kind of polytetrafluoroethylene hollow fiber membrane and preparation method thereof

A polytetrafluoroethylene and fiber membrane technology, which is applied in the field of preparing polytetrafluoroethylene hollow fiber membranes, can solve the problems of inability to adapt to high-precision separation and filtration, large pore size, low bubble point, etc., and achieves low cost and simple preparation method. , Improve the effect of filtering precision

Inactive Publication Date: 2011-12-07
ZHEJIANG DONGDA ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PTFE hollow fiber membrane prepared only by stretching and expanding method has a large pore size, generally above 0.5 μm, and a low bubble point (0.5 kg / cm 2 ), cannot meet the requirements of high-precision separation and filtration

Method used

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  • A kind of polytetrafluoroethylene hollow fiber membrane and preparation method thereof
  • A kind of polytetrafluoroethylene hollow fiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Slit a PTFE flat membrane with a pore size of 0.02μm and a thickness of 5μm to obtain a microporous PTFE membrane wrapping tape with a width of 3mm;

[0026] (2) Immerse the microporous polytetrafluoroethylene film wrapping tape with a 10% solid content polyperfluoroethylene propylene (FEP) aqueous dispersion;

[0027] (3) Wrap the impregnated microporous PTFE membrane wrapping tape on the outer ring wall of the PTFE hollow fiber with a pore diameter of 0.5μm, an inner diameter of 1mm, and an outer diameter of 1.8mm. Heat treatment at 270℃ for 10s, get a bubble point of 5kg / cm 2 , 1kg / cm 2 A PTFE hollow fiber membrane with a flux of 2000L / m2·h under operating pressure.

Embodiment 2

[0029] (1) Slit a PTFE flat membrane with a pore size of 0.1 μm and a thickness of 20 μm to obtain a microporous PTFE membrane wrapping tape with a width of 10 mm;

[0030] (2) Immerse the microporous polytetrafluoroethylene film wrapping tape with a 20% solid content polyperfluoroethylene propylene (FEP) aqueous dispersion;

[0031] (3) Wrap the impregnated microporous PTFE membrane wrapping tape on the outer ring wall of the PTFE hollow fiber with a hole diameter of 1.0μm, an inner diameter of 2mm and an outer diameter of 2.8mm, and wrap it in two layers, and then wrap it at 285 Heat treatment at ℃ for 5s, get a bubble point of 2kg / cm 2 , 1kg / cm 2 A PTFE hollow fiber membrane with a flux of 3500L / m2·h under operating pressure.

Embodiment 3

[0033] (1) Slit a PTFE flat membrane with a pore size of 0.5 μm and a thickness of 100 μm to obtain a microporous PTFE membrane wrapping tape with a width of 20 mm;

[0034] (2) Immerse the microporous polytetrafluoroethylene flat membrane wrapping tape with 50% solid content polyperfluoroethylene propylene (FEP) water dispersion;

[0035] (3) Wrap the impregnated microporous PTFE membrane wrapping tape on the outer ring wall of the PTFE hollow fiber with a diameter of 2μm, an inner diameter of 3mm and an outer diameter of 4mm, and wrap it in five layers, and then at 300℃ Heat treatment at temperature for 8s, get a bubble point of 1.5kg / cm 2 , 1kg / cm 2 A PTFE hollow fiber membrane with a flux of 5000L / m2·h under operating pressure.

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Abstract

The invention discloses a polytetrafluoroethylene hollow fiber membrane, which comprises a polytetrafluoroethylene hollow fiber with a pore diameter range of 0.5-2 μm and at least one layer of polytetrafluoroethylene hollow fiber with a pore diameter range of 0.02-0.5 μm. Microporous polytetrafluoroethylene film layer with a thickness of 5-100 μm and a thickness of 5 μm. The present invention also provides a preparation method of the polytetrafluoroethylene hollow fiber membrane. The polytetrafluoroethylene hollow fiber membrane of the invention has the advantages of small filter aperture, high filter precision, high porosity, high filter flux and high strength.

Description

Technical field [0001] The invention relates to a method for preparing a polytetrafluoroethylene hollow fiber membrane, in particular to a method for preparing a polytetrafluoroethylene hollow fiber membrane with a controllable pore size. Background technique [0002] The main membrane materials currently used for the production of ultra-microfiltration products include cellulose acetate, polysulfone, polyethersulfone, polyethylene, polypropylene, polyacrylonitrile, polyvinyl chloride, and polyvinylidene fluoride. Larger usage includes polysulfone, polyethersulfone, polyvinyl chloride, polypropylene and polyvinylidene fluoride. The current hollow fiber membranes of these materials have low porosity (below 50%) and low filtration flux (1kg / cm 2 Under operating pressure, the filtration flux is generally less than 500L / m2·h), and the energy consumption is high. At the same time, most of the hollow fiber membranes of these materials are prepared by the phase inversion method, and th...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/36B01D67/00
Inventor 吴益尔钱建斌陈晓美
Owner ZHEJIANG DONGDA ENVIRONMENTAL ENG
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