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Preparation of porous membrane

A technology of porous membrane and membrane casting solution, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems affecting product quality, difficult to degrade, complex equipment, etc., and achieve easy control of membrane pore size and thickness , easy to control the effect of membrane performance

Inactive Publication Date: 2008-09-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this membrane method has achieved large-scale production, there are many disadvantages in this preparation method: (1) pollute the environment
This method produces a large amount of organic waste water in the preparation process, which is difficult to degrade when discharged into the environment, causing water pollution; (2) the washing process consumes a large amount of water, resulting in waste of water; (3) the equipment is complicated and the cost is high
(4) The film is easy to shrink and deform, which affects product quality
[0004] Therefore, there is an urgent need for a new asymmetric membrane preparation method to meet industrial needs and effectively solve the problems of wasting water resources and polluting the environment.

Method used

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  • Preparation of porous membrane
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 75ml of acetone and 25ml of distilled water were stirred at room temperature for 1 hour to prepare a mixed solvent, then 15g of polyvinylidene fluoride powder was added to the prepared mixed solvent and stirred for 2 hours, and the above solution was covered and allowed to stand for 1 day to form Casting solution: pour the above-mentioned casting solution on a glass plate or non-woven fabric, spread it evenly, and dry the above-mentioned coated film in the air for 30 seconds; then place the film on gauze, and place it at room temperature. In the dry air flow, make the upper and lower sides of the film fully contact with the air flow, and place it for 1 hour to make the film preliminarily dry. The film is then placed in a drying oven at 100° C. or in hot air, and the film is allowed to stand for 3 hours until the film is completely dry. Preparation is complete. The membrane prepared by this method has the figure 1 The microporous structure shown is mainly composed of m...

Embodiment 2

[0024] 80ml of tetrahydrofuran and 20ml of butanol were covered and stirred at room temperature for 1 hour to prepare a mixed solvent, then 7g of polyvinylidene fluoride powder was added to the prepared mixed solvent and stirred for 2 hours, and the above solution was covered and allowed to stand for 1 day. Form a casting solution; pour the above casting solution on a glass plate or non-woven fabric, spread it evenly, and dry the above-mentioned coated film in the air for 40 seconds; then place the film on a gauze net and place it at room temperature In the dry air flow, make the upper and lower sides of the film fully contact with the air flow, and place it for 2 hours to make the film preliminarily dry. The film is then placed in a drying oven at 120° C. or in hot air, and the film is allowed to stand for 2 hours until the film is completely dry. Preparation is complete. The membrane prepared by this method has the figure 2 The microporous structure shown includes a skin ...

Embodiment 3

[0026] Cover and stir 75ml of acetone and 25ml of toluene at room temperature for 1 hour to prepare a mixed solvent, then add 12g of polysulfone powder to the prepared mixed solvent and stir for 3 hours, cover the above solution and let it stand for 1 day to form a casting film liquid; pour the above-mentioned casting solution on a glass plate or non-woven fabric, spread it evenly, and dry the above-mentioned coated film in the air for 40 seconds; then put the film on the gauze, and place it in dry air at room temperature In the air flow, make the upper and lower sides of the film fully contact with the air flow, and place it for 1.5 hours to make the film preliminarily dry. The film is then placed in a drying oven at 100° C. or in hot air, and the film is allowed to stand for 2 hours until the film is completely dry. Preparation is complete. The membrane prepared by this method has the figure 1 The microporous structure shown is mainly composed of micropores 1 .

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Abstract

The invention discloses a method for preparing a porous membrane. The porous membrane preparing method of the invention comprises the following steps: polymer material is arranged in mixed solvent for being mixed, so as to form casting solution; the mixed solvent is of high boiling point solvent with the boiling point being 90 DEG to 300 DEG or low boiling point solvent with the boiling point being 50 DEG to 80 DEG; the obtained casting solution is poured on a glass plate or non-woven fabric, and is evenly coated to form a membrane, which is then arranged in the moist air to stand for 10 to 40 seconds; the obtained membrane is arranged on gauze in the dry air for 1 to 2 hours; the obtained membrane in the third step is arranged in a drying oven of 90 DEG to 200 DEG or hot blast for 2 to 3 hours, until the membrane is completely dried. Compared with the prior art, the method has the following advantages and beneficial effects that a coagulation bath is prevented to be used, the water is saved, and the waste water discharge is avoided; the pore size and the thickness of the membrane are easily controlled, and the membrane performance is easily controlled; and the shrinkage deformation produced in the membrane manufacturing process can be avoided.

Description

technical field [0001] The invention relates to a method for preparing a membrane, in particular to a method for preparing a porous membrane. Background technique [0002] The invention of porous membrane has greatly promoted the application of membrane technology in the field of industry and agriculture. This membrane has high permeability and gas selectivity. In addition, this membrane has high mechanical strength and is suitable for industrial applications. Therefore, porous membranes have been widely used in water treatment, gas separation, environmental protection and other fields. [0003] At present, almost all porous membranes are prepared by wet phase inversion method. The main steps are: dissolving the polymer material and the porogen together in a solvent to form a casting solution, then coating the casting solution on a glass plate, standing in the air for a while, and then immersing the film in a liquid coagulation bath In the process, the phase separation o...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/34B01D71/68B01D71/16
Inventor 张立志裴丽霞
Owner SOUTH CHINA UNIV OF TECH