Method for preparing porous separation membrane

A porous separation membrane and membrane-forming technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as uselessness and unusable separation of membrane materials, and achieve simple production methods, low production costs, The effect of reducing environmental pollution

Inactive Publication Date: 2007-12-26
NANJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

But so far, peeled-off hierarchical structures have been defined by researchers as useless structures
The above technology emphasizes the bond

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  • Method for preparing porous separation membrane
  • Method for preparing porous separation membrane

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Embodiment 1

[0028] 15.0 grams of polysulfone and 15.0 grams of polyvinylpyrrolidone ((PVP K90) were dissolved in 70 grams of nitrogen-methylpyrrolidone to prepare a support layer solution. The solution had a viscosity of 1100 centipoise at 25°C. Polyether acyl Imine (PEI) 20 grams and 80 grams of nitrogen-methylpyrrolidone are mixed with composite layer solution.Utilize double-layer scraper that two kinds of solutions are spread on the smooth and dry glass plate simultaneously, and two-layer thickness is respectively 100 and 300 microns; Place it in the air (20.0±2°C, relative humidity 55%) for about 2 seconds and then immerse in water for phase separation and solidification. When the composite layer and the support layer are completely cured, the polyimide film and the polysulfone film are completely separated. Measure poly The pure water permeability of the sulfone membrane is 190L.m -2 .hr -1 .bar -1 . The polysulfone membrane was soaked in 4000ppm sodium hypochlorite aqueous soluti...

Embodiment 2

[0033] Dissolve 17.0 grams of polysulfone and 15.0 grams of polyvinylpyrrolidone ((PVP K90) in 70 grams of nitrogen-methylpyrrolidone to prepare a support layer solution. The solution has a viscosity of 1500 centipoise at 25°C. Polyimide (PEI ) 15 grams and 85 grams of nitrogen-methylpyrrolidone are prepared into a composite layer solution. Utilize a double-layer scraper to spread the two solutions onto a smooth and dry glass plate simultaneously, and the thickness of the two layers is respectively 100 and 300 microns; in air (20.0 ± 2 ℃, relative humidity 45%) placed in the water for about 2 seconds and then immersed in water for phase separation and solidification. When the composite layer and the support layer are completely cured, the polyimide membrane and the polysulfone membrane are completely separated. The polysulfone membrane is slightly exposed to the air Immerse in 4000ppm sodium hypochlorite aqueous solution after drying in the medium. After 48 hours, take out the ...

Embodiment 3

[0035] 17.0 grams of polyethersulfone and 30.6 grams of diethylene glycol ((DegOH) were dissolved in 52.4 grams of nitrogen-methylpyrrolidone to prepare a support layer solution. The solution had a viscosity of 53 centipoise at 25°C. Polyethersulfone (PES ) 17 grams and 83 grams of nitrogen-methylpyrrolidone to prepare a composite layer solution. Utilize a 200 micron scraper to spread the support layer solution onto a smooth and dry glass plate, and place it in the air (20.0 ± 2 ° C, relative humidity 95%) After 15 seconds, the surface of the support layer solution was milky white, and then the composite layer solution was spread on the support layer solution with a 250 micron scraper; quickly immersed in water for phase separation and solidification. When the composite layer and the support layer were cured, the composite polyether was found The sulfone membrane and the underlying polyethersulfone membrane are completely separated. After immersing the underlying polyethersulfo...

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Abstract

The invention publishes a method for producing porous separation membrane, especially involves a multi-layer extrusion molding method. Its characteristic is: completing the extrusion molding of different high polymer solution at the same time. Then realizing separation among different high polymer solution through the inversion of phase's method. Lastly, solidifying to become membrane. In the solidification process, the compound level peel support level, the support level becomes the porous separation membrane which needs. This invention uses the multi-layered system membrane technology, and uses compound level to control the membrane structure, which is simple manufacture, overcome many technology insufficient existing in porous membrane material preparation. The pore membrane has the very big percentage open area, when it filters the high suspension liquid, and can hold the massive pollutant, so that it has high current capacity and low clean frequency.

Description

technical field [0001] The invention discloses a method for preparing a porous separation membrane, in particular to a method for preparing a porous separation membrane by a multilayer extrusion molding method. technical background [0002] The preparation of polymer membranes can be traced back to the invention of microporous membranes in 1907. At that time, the preparation of microporous membranes was mainly based on the dry method (H. Bechhold, Investigation on colloids by filtration method, Biochem. Z., 6 (1907) 397). The dry microporous membrane preparation process includes: polymer solution configuration, molding, and then phase-separation solidification in a temperature and humidity-controlled environment to form a membrane. The dry membrane generally forms a symmetrical membrane structure. In the 1860s, the discovery of asymmetric membranes introduced the concept of wet (immersion) preparation of polymer membranes. Thanks to the development of phase separation the...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D67/00
Inventor 何涛李雪梅李战胜
Owner NANJING UNIV OF TECH
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