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Preparation method of high molecular ultra-filtration membrane

An ultrafiltration membrane and polymer technology, applied in the field of membrane separation, can solve the problems of large liquid flow resistance, large pressure loss, small membrane flux, etc., and achieve the effect of high retention rate, small pressure loss, and small flow resistance.

Active Publication Date: 2014-06-04
北京安通忆泰医疗科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the shortcomings of current ultrafiltration membranes, such as large liquid flow resistance, large pressure loss, low membrane flux, short lifespan and unsuitable for handling viscous liquids in micropores during separation and filtration, a preparation method of polymer ultrafiltration membranes is proposed. For the above-mentioned purpose, the present invention adds the spindle-shaped solid pore-forming agent to the solution of the polymer base film material, carries out ultrasonic vibration dispersion, vacuum degassing treatment to form a casting solution, and solidifies the casting solution to form a film. Then, the pore-forming agent in the prepared membrane is dissolved to form spindle-shaped pores, and a polymer ultrafiltration membrane with a spindle-shaped microporous structure is obtained.

Method used

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Experimental program
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Effect test

Embodiment 1

[0030] 1) Dissolve 20 parts by weight of polysulfone with 70 parts by weight of dimethylformamide at room temperature while stirring, and the stirring speed is 50r / min, so that the polymer base film material is completely dissolved in the solvent to form a base film liquid;

[0031] 2) Add 2 parts by weight of calcium carbonate and 1 part by weight of triethylhexyl phosphoric acid to the base film liquid obtained in step 1), vibrate and disperse with an ultrasonic generator for 10 minutes, and perform vacuum defoaming treatment after uniform dispersion to form a cast film liquid;

[0032] 3) The casting liquid obtained in step 2) is cast and scraped on a glass plate, air-dried for 40s, immersed in a gel bath, and cured into a film by gel;

[0033] 4) The membrane obtained in step 3) was immersed in a hydrochloric acid solution, dissolved by ultrasonic vibration for 20 minutes, taken out, washed with distilled water, and air-dried to obtain a polymer ultrafiltration membrane. ...

Embodiment 2

[0035] 1) Dissolve 30 parts by weight of polyvinyl chloride with 60 parts by weight of dimethyl acetyl at normal temperature while stirring, and the stirring speed is 80r / min, so that the polymer base film material is completely dissolved in the solvent to form a base film liquid;

[0036] 2) Add 5 parts by weight of magnesium carbonate and 3 parts by weight of sodium dodecyl sulfate to the base film liquid obtained in step 1), and use an ultrasonic generator to vibrate and disperse for 20 minutes. After uniform dispersion, vacuum defoaming is performed to form a cast. membrane fluid;

[0037] 3) The casting liquid obtained in step 2) is cast and scraped on a glass plate, air-dried for 60s, immersed in a gel bath, and cured into a film by gel;

[0038]4) The membrane obtained in step 3) was immersed in a nitric acid solution, dissolved by ultrasonic vibration for 20 minutes, taken out, washed with distilled water, and air-dried to obtain a polymer ultrafiltration membrane.

Embodiment 3

[0040] 1) Dissolve 20 parts by weight of polyacrylonitrile with 60 parts by weight of N-methylpyrrolidone at room temperature while stirring, at a stirring speed of 50r / min, so that the polymer base film material is completely dissolved in the solvent to form a base film liquid;

[0041] 2) Add 5 parts by weight of barium carbonate and 3 parts by weight of methyl amyl alcohol to the base film liquid obtained in step 1), shake and disperse with an ultrasonic generator for 20 minutes, and perform vacuum defoaming treatment after uniform dispersion to form a casting film liquid ;

[0042] 3) The casting liquid obtained in step 2) is cast and scraped on a glass plate, air-dried for 40s, immersed in a gel bath, and cured into a film by gel;

[0043] 4) The membrane obtained in step 3) was immersed in a hydrochloric acid solution, dissolved by ultrasonic vibration for 20 minutes, taken out, washed with distilled water, and air-dried to obtain a polymer ultrafiltration membrane.

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Abstract

The invention relates to a preparation method of a high molecular ultra-filtration membrane. The preparation method specifically comprises the steps of adding a fusiform solid pore-forming agent into a high molecular basement membrane material solution for ultrasonic oscillation and dispersion; carrying out vacuum defoamation treatment to form a casting solution; consolidation-forming the casting solution to prepare a membrane; dissolving the pore-forming agent in the prepared membrane; and forming fusiform pores to obtain the high molecular ultra-filtration membrane with a fusiform micropore structure. When the liquid is separated and filtered, the flow resistance of the liquid in the micropores of the high molecular ultra-filtration membrane is small, the pressure loss is less, the membrane flux is high. The ultra-filtration membrane is especially suitable for treating thick liquid and has wide application value.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a preparation method of a polymer ultrafiltration membrane. Background technique [0002] Ultrafiltration membranes are widely used in industry and have become one of the new chemical unit operations. It is not only used in the separation, concentration, purification of biological products, pharmaceutical products and food industry; it is also used in terminal treatment devices in blood treatment, wastewater treatment and ultrapure water preparation. Ultrafiltration membrane is a kind of membrane technology used to separate according to the difference of relative molecular mass with static pressure difference as the driving force. The unique micropores of the ultrafiltration membrane can effectively retain bacteria, most viruses, colloids and sludge, and achieve the purpose of separation, classification, purification and concentration. [0003] The separation and filtration e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/68B01D71/30B01D71/42B01D71/34B01D71/52
Inventor 陈庆李兴文
Owner 北京安通忆泰医疗科技有限公司
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