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Method for preparing hydrophilic low catching molecular composite ultrafiltering membrane

An ultrafiltration membrane and low cut-off technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of difficult to effectively control the membrane separation layer structure, unsatisfactory charged ultrafiltration membrane effect, hydrophilicity, etc. To achieve the effect of improving anti-pollution performance, controllable surface structure and improving interception performance

Inactive Publication Date: 2007-10-17
SHANGHAI UNIV
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

As the most widely used ultrafiltration membrane preparation method, the phase inversion method still has various deficiencies, such as the single function of the prepared membrane, generally poor hydrophilicity, and it is difficult to effectively control the separation layer structure of the membrane. Membrane effect is not ideal, etc.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment one: the preparation process of this embodiment is as follows:

[0024] 1) Configure the casting solution of the following composition: polysulfone (12%), polyvinylpyrrolidone (6%), acetone (1%), and the solvent is 1-methyl-2-pyrrolidone; fully stir the casting solution to make each group Parts are completely dissolved, and then sealed and left for 24 hours, so that the casting solution is completely degassed.

[0025] 2) Use a scraper to evenly spread the casting solution on the support material, let it stand for a while, and then quickly immerse it in the coagulation bath to form a film. The evaporation time of the casting solution is 30s; the coagulation bath is deionized water containing 2% NaCl.

[0026] 3) Immerse the ultrafiltration membrane basement membrane prepared in step 2) in a sodium polystyrene sulfonate solution with a concentration of 0.10 mol / L for 30 minutes, wherein the concentration of NaCl is 2.0 mol / L; wash with pure water and soak in ...

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Abstract

The invention relates to a method for preparing a hydrophilic low retain molecular weight composite ultrafiltration membrane. The invention uses polysulfone or polyethersulfone as membrane material to prepare water repellent ultrafiltration membrane-substrate membrane with high retain molecular weight by transfer method; and based on this, the polyelectrolyte multilayer film is assembled on the ultrafiltration membrane-substrate membrane as a composite layer using layers static self-assembly technology to get the hydrophilic low retain molecular weight composite ultrafiltration membrane. The said composite ultrafiltration membrane preparation method in the invention is characterized in low cost and simple process. The surface of the composite ultrafiltration membrane prepared by the said method in the invention is electriferous, electrical property is controlled, and the surface structure is controlled. The invention has good retain performance to the low molecular weight solute, and also has better anti pollution performance.

Description

technical field [0001] The invention relates to a preparation technology of a composite ultrafiltration membrane, in particular to a preparation method of a hydrophilic low molecular weight cut-off composite ultrafiltration membrane. Background technique [0002] Membrane separation technology refers to the method of separating, fractionating, purifying and enriching two-component or multi-component solutes or solvents with artificially synthesized or natural polymer membranes, driven by external energy or chemical potential difference. It is suitable for separating substances that are difficult to separate, have low concentrations, and have similar molecular structures. Membrane separation technology has been developed for more than two hundred years. It was not until the mid-1960s that membrane separation technology was applied in industry. Membrane separation processes mainly include microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/68B01D71/82
Inventor 施利毅刘达方建慧曹志源沈霞
Owner SHANGHAI UNIV
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