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Method for preparing hydrophilic macromolecule microporous composite membrane

A hydrophilic polymer and composite membrane technology, applied in the field of membrane separation, can solve the problems of poor pollution resistance and low membrane flux, and achieve the effect of improving processing capacity and efficiency and superior pollution resistance.

Inactive Publication Date: 2012-08-01
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to find an alternative product of a flat MBR membrane material to solve the problems of poor pollution resistance and low membrane flux of existing flat PVDF and PE membranes.

Method used

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  • Method for preparing hydrophilic macromolecule microporous composite membrane
  • Method for preparing hydrophilic macromolecule microporous composite membrane
  • Method for preparing hydrophilic macromolecule microporous composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Preparation of casting solution: Add 100g of polyvinyl formal (56% degree of acetalization) into 520g of 15% hydrochloric acid aqueous solution, heat to 80°C to dissolve it, and let it stand for defoaming.

[0019] 2. Scraping film: use a scraper to scrape and coat the casting solution on the polyester non-woven fabric.

[0020] 3. Solidification: The above-mentioned casting solution is immersed in an aqueous sodium hydroxide solution at 40°C and pH=9, and solidifies into a microporous membrane through phase separation.

[0021] After the sample was dried, the structure and morphology were observed with a scanning electron microscope, and the results are shown in the attached figure 1 , attached figure 2 , the surface film thickness is about 20 μm, and the average membrane pore size is 0.2 μm.

[0022] Under the pressure of 1.5 meters of water column, the flux of clear water is measured as 28m 3 / m 2 d.

Embodiment 2

[0024] 1. Preparation of casting solution: Add 100g of polyvinyl formal (60% degree of acetalization) into 520g of 16% hydrochloric acid aqueous solution, heat to 80°C to dissolve, and let stand for defoaming.

[0025] 2. Scraping film: use a scraper to scrape and coat the casting solution on the polyester non-woven fabric.

[0026] 3. Solidification: The above-mentioned casting solution is immersed in an aqueous sodium hydroxide solution at 25°C and pH=10, and is solidified into a microporous membrane through phase separation.

[0027] After the sample was dried, the structure and morphology were observed with a scanning electron microscope, and the results are shown in the attached image 3 , attached Figure 4 , the surface film thickness is about 10μm, and the average membrane pore size is 0.45μm.

[0028] Under the pressure of 1.5 meters of water column, the clear water flux is 36m 3 / m 2 d.

Embodiment 3

[0030] 1. Preparation of casting solution: Add 100g of polyvinyl formal (60% degree of acetalization) into 700g of 12% sulfuric acid aqueous solution, heat to 85°C to dissolve it, and let it stand for defoaming.

[0031] 2. Scraping film: use a scraper to scrape and coat the casting solution on the polyester non-woven fabric.

[0032] 3. Solidification: The above-mentioned casting solution is immersed in an aqueous potassium hydroxide solution at 45°C and pH=10.5, and solidifies into a microporous membrane through phase separation.

[0033] Under the pressure of 1.5 meters of water column, the clear water flux is 32m 3 / m 2 d.

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Abstract

A method for preparing a hydrophilic macromolecule microporous composite membrane is characterized by comprising the steps: (1) adding polyvinyl formal into 5-30% by mass of hydrochloric acid or sulfuric acid aqueous solution to be heated to the temperature of 40-100 DEG C and dissolved, performing standing and defoaming, wherein the adding amount of the polyvinyl formal is 8-20% by mass of polyvinyl formal in feed liquid; and (2) performing blade coating to coat the feed liquid on polyester non-woven fabrics, submerging the polyester non-woven fabrics in an alkaline aqueous solution with the temperature of 20-50 DEG C, and forming the microporous membrane through phase separation and solidification. In the preparation process, an organic solvent is not used so that the method is environment-friendly and safe. Hydrophilic functional group-OH in a polyvinyl alcohol structure is utilized, and the problem that polyvinyl alcohol is difficultly and directly prepared into the microporous membrane is solved. The composite membrane prepared by means of the method is made of a hydrophilic membrane material which has high membrane flow under the lower pressure and good fouling resistant performance and is used as a flat membrane material, and can remarkably improve processing capability and efficiency of a membrane bioreactor.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a hydrophilic polymer microporous composite membrane and a preparation method thereof. Background technique [0002] Membrane bioreactor (MBR) is a new type of efficient sewage treatment technology, which represents the development direction of future water treatment technology. The key to membrane bioreactor is the membrane material, membrane fouling will lead to the reduction of its treatment capacity and efficiency. Generally speaking, the stronger the hydrophilicity of the membrane material, the better its anti-fouling performance. Improving the hydrophilicity of membrane materials is a method for hydrophobic polymer membranes, such as PVDF, PE, etc., which have poor pollution resistance. The commonly used methods are blending or surface modification, and the effect can only be limited. of. Finding a hydrophilic membrane material with superior performance is expe...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D67/00B01D69/12
Inventor 张文龙李茂康田建文李永绣
Owner NANCHANG UNIV
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