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Conductive polymer porous membrane

A polymer and porous membrane technology, applied in the field of polymer separation membrane preparation, can solve the problems of high brittleness and high production cost, and achieve the effects of poor structural stability, difficult agglomeration, and good permeability

Active Publication Date: 2014-06-11
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, researches on the coupling of electric field-photocatalysis-membrane separation all use conductive inorganic carbon film as the base film, which has high preparation cost and high brittleness.
As an important part of membrane materials, polymer membranes have a wide range of raw materials, simple preparation processes, and good flexibility. However, there are still few reports on polymer conductive porous membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ultrasonic dispersion of 6g of nano-carbon black particles in 188g of water at 25°C for 1h, with ultrasonic power of 100w, then high-speed stirring for 1h at a stirring speed of 800r / min, adding 6g of polyvinyl alcohol into it, and fully stirring at 90°C for 2h , with a stirring speed of 300r / min to obtain a uniform dynamic membrane casting liquid; rinse the ultra-high molecular weight polyethylene hollow fiber membrane with water for 10 minutes; use the dynamic membrane casting liquid as the liquid to be filtered, and use the ultra-high molecular weight polyethylene hollow fiber membrane As a filter material, under the operating pressure of 0.1MPa, at 70°C, the dead-end external pressure deposition mode was adopted, and the continuous operation was performed for 15 minutes to obtain a dynamic composite membrane. After natural air drying, the polymer conductive porous membrane was obtained.

[0022] Through comparative testing, the water flux of the ultra-high molecular ...

Embodiment 2

[0024] Ultrasonic dispersion of 8g of nano-carbon black particles in 184g of water at 25°C for 1h, with ultrasonic power of 150w, then high-speed stirring for 1h at a stirring speed of 1000r / min, adding 8g of polyvinyl alcohol, and fully stirring at 90°C for 2h , with a stirring speed of 400r / min to obtain a uniform dynamic membrane casting liquid; rinse the ultra-high molecular weight polyethylene hollow fiber membrane with water for 10 minutes; use the dynamic membrane casting liquid as the liquid to be filtered, and use the ultra-high molecular weight polyethylene hollow fiber membrane As a filter material, under the operating pressure of 0.2MPa, at a temperature of 60°C, adopt the cross-flow external pressure deposition mode, and run continuously for 45 minutes to obtain a dynamic composite membrane. After natural air drying, the polymer conductive porous membrane is obtained.

[0025] After testing, the water flux of the obtained membrane is 98.3L / (m 2 .h), the bubble poi...

Embodiment 3

[0027]Ultrasonic dispersion of 14g of nano-carbon black particles in 180g of water at 25°C for 2h, with ultrasonic power of 100w, then high-speed stirring for 2h, stirring speed of 1000r / min, adding 6g of polyoxyethylene, and fully stirring at 80°C for 2h , the stirring speed is 500r / min, to obtain a uniform dynamic membrane casting solution; the polyvinylidene fluoride flat membrane is washed with water for 10 minutes; the dynamic membrane casting solution is used as the liquid to be filtered, and the polyvinylidene fluoride flat membrane is used as the filter material. Under an operating pressure of 0.1 MPa, at a temperature of 80° C., using a cross-flow pressurized deposition mode, and continuously operating for 30 minutes, the obtained dynamic composite membrane was naturally air-dried to obtain the polymer conductive porous membrane.

[0028] By comparison, the water flux of the flat polyvinylidene fluoride membrane without a dynamic membrane coating is 350.1L / (m 2 .h), t...

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PUM

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Abstract

The invention discloses a conductive polymer porous membrane. The conductive polymer porous membrane has a surface specific resistance of more than 160 omega.m. The conductive polymer porous membrane is prepared by the following method comprising the steps: carrying out ultrasonic dispersion on carbon black for 1-3 hours in water at 25 DEG C, wherein the ultrasonic wave power is 0-300 w; then stirring, adding a binding agent into the mixture, and fully stirring to obtain a uniform dynamic membrane casting solution; washing a polymer basement membrane with water; continuously running under the operation pressure of 0.1-0.3 MPa and at the temperature of 25-90 DEG C by using a depositional mode with the uniform dynamic membrane casting solution obtained in the step (1) as a solution to be filtered and the polymer basement membrane obtained in step (1) as a filter material to obtain a dynamic composite membrane; and naturally drying to obtain the conductive polymer porous membrane. The preparation method is simple in process, has no environmental pollution and no special requirement on equipment, is low in cost and achieves convenience for industrial application.

Description

technical field [0001] The invention relates to a polymer separation membrane preparation technology, in particular to a polymer conductive porous membrane. Background technique [0002] Membrane separation, as an emerging high-efficiency, energy-saving, and environment-friendly separation technology, has become an effective means to solve the problems of resource crisis and environmental degradation, and it is also a key technology for organic wastewater treatment. However, the use of membrane technology for advanced treatment of organic wastewater has problems such as low separation accuracy, easy pollution, and short service life of the membrane (Liu C X, Zhang D R, He Y, ZhaoX S, Bai R B. Modification of membrane surface for anti-biofouling performance : Effect of anti-adhesion and anti-bacteria approaches. J Membrane Sci, 2010, 346(1): 121-130). [0003] The coupling of photocatalytic technology and membrane separation technology is an effective way to realize membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/14B01D67/00B01D71/26B01D71/34
Inventor 李娜娜肖长发韩栋陈斌
Owner TIANJIN POLYTECHNIC UNIV
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