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Silica nanoparticle blended modified polysulfone membrane and its preparation method

A technology of silica and blending modification, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems that microorganisms need to be further improved, membrane flux is not large enough, and hydrophilicity is not ideal enough , to achieve the effects of improved acid and alkali resistance, improved anti-pollution performance, and enhanced acid and alkali resistance

Active Publication Date: 2012-06-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the hydrophilicity of the polysulfone membrane, whether it is industrialized or researched, is not ideal. Therefore, when the ultrafiltration cut-off requirement is met, the membrane flux is not large enough, and the anti-pollution and anti-microbial growth performance of the polysulfone membrane also needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using N-methyl-2-pyrrolidone as a solvent (produced by Tianjin Kemiou Chemical Reagent Co., Ltd.), add 100 mL of solvent to a 250 mL reactor, and then add 20 grams of polysulfone particles (produced by Solvay Group, model P-3500 ), keep the temperature of the reactor up to 70°C, and dissolve the polysulfone with 200 rpm high-speed mechanical stirring. Produced by the company), 200 rpm stirring and continuous stirring for 1.5 hours to make a uniform solution. Put the solution in a vacuum box with a pressure of 0.4 atmosphere, and place it at 20°C for 20 hours for defoaming, heat the solution after vacuum defoaming to 35°C, apply the solution evenly on the non-woven fabric under the heat preservation state, and scrape it into 400 micron thick film. Place the prepared membrane in water, keep the water temperature at 30° C., soak in water for 40 minutes, and take it out to obtain a silicon dioxide nanoparticle blended modified polysulfone membrane. Under the pressure of 0...

Embodiment 2

[0026] Using N-methyl-2-pyrrolidone as a solvent (produced by Tianjin Kemiou Chemical Reagent Co., Ltd.), add 100 mL of solvent to a 250 mL reactor, and then add 15 grams of polysulfone particles (produced by Solvay Group, model P-3500 ), keep the temperature of the reactor up to 60°C, and dissolve the polysulfone with 180 rpm high-speed mechanical stirring. Produced by the company), 180 rev / min stirred continuously for 2 hours to make a uniform solution. Put the solution in a vacuum box with a pressure of 0.6 atmosphere, place it at 30°C for 18 hours for defoaming, heat the solution after vacuum defoaming to 25°C, apply the solution evenly on the non-woven fabric under the heat preservation state, and scrape it into 450 micron thick film. Place the prepared membrane in water, keep the water temperature at 20° C., soak in water for 60 minutes, and take it out to obtain a silicon dioxide nanoparticle blended modified polysulfone membrane. Under the pressure of 0.2MPa, the mem...

Embodiment 3

[0028] Using N-methyl-2-pyrrolidone as a solvent (produced by Tianjin Kemiou Chemical Reagent Co., Ltd.), add 100 mL of solvent to a 250 mL reactor, and then add 22 grams of polysulfone particles (produced by Solvay Group, model P-3500 ), keep the temperature of the reactor up to 80°C, and dissolve the polysulfone with 220 rev / min high-speed mechanical stirring. Produced by the company), 220 rpm stirring and continuous stirring for 2 hours to make a uniform solution. Put the solution in a vacuum box with a pressure of 0.1 atmosphere, and place it at 15°C for 24 hours for defoaming. The vacuum defoamed solution is heated to 45°C. 350 micron thick film. Place the prepared membrane in water, keep the water temperature at 40° C., soak in water for 30 minutes, and take it out to obtain the silicon dioxide nanoparticle blended modified polysulfone membrane. Under the pressure of 0.2MPa, the ultrafiltration concentration of this membrane is the aqueous solution of bovine serum albu...

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Abstract

The invention discloses a silica nanoparticle blended modified polysulfone membrane. Its preparation method contains the following steps of: using N-methyl-2-pyrrolidone as a solvent, adding polysulfone, completely dissolving polysulfone by high-speed mechanical stirring, adding silica nanoparticles, stirring at high speed to prepare a uniform solution, followed by vacuum deaeration, heating to 25-45 DEG C, uniformly coating on non-woven fabrics, scraping to form a membrane of 300-450 micrometer thickness, immersing the prepared membrane in water of 20-40 DEG C for 30-60 minutes, and taking out to obtain the silica nanoparticle blended modified polysulfone membrane. The silica nanoparticle blended modified polysulfone membrane provided by the invention can be applied in ultrafiltration. In comparison with a pure polysulfone membrane, the silica nanoparticle blended modified polysulfone membrane is characterized in that its retention rate is raised and its water flux is increased. By the adoption of the membrane provided by the invention, efficiency of membrane ultrafiltration is obviously raised. By the adoption of the preparation method, anti-pollution performance of the membrane surface is raised, the cleaning effect is improved, acid and alkali resistance of the membrane during cleaning is enhanced, and the membrane has an effect of inhibiting the growth of microorganisms.

Description

1. Technical field [0001] The invention belongs to the technical field of membrane engineering, especially the technical field of membrane modification. 2. Background technology [0002] The manufacture of polysulfone membranes has been industrialized and is widely used in various ultrafiltration. The industrial production of polysulfone membranes generally adopts the phase inversion method, that is, polysulfone is dissolved in an organic solvent to obtain a uniform polysulfone solution, and the solution is scraped on the support with a scraper to control the thickness of the scraped layer. In water, after a period of time, polysulfone is stably deposited on the support to form a finished membrane. This production technology can stably produce various polysulfone membranes, including the selection of various organic solvents and mixed organic solvents, and the selected solvents are completely miscible with water. When preparing the polysulfone solution, various substances ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D67/00
Inventor 钱俊青吕坚方
Owner ZHEJIANG UNIV OF TECH
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