Hydrophilic polysulfone-type membrane and preparation method thereof

A polysulfone-based, hydrophilic technology, applied in the field of organic membrane preparation, can solve the problems of low membrane flux, reduced treatment efficiency, poor membrane hydrophilicity, etc., to achieve improved hydrophilic performance, improved separation effect, and improved hydrophilicity. water effect

Active Publication Date: 2017-07-14
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Polysulfone membranes have poor hydrophilicity and are easy to adsorb pollutants during use, resulting in low membrane flux, short life, easy clogging, and reduced treatment efficiency, which greatly restricts their popularization and use;
[0006] 2. The preparation methods of existing polysulfone nanofiltration membranes all adopt the method of interfacial polymerization, the operation process is complex, the solvent consumption is large, and the utilization rate of equipment is low. This shows that the preparation of polysulfone membranes in the prior art needs further improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The method prepares a hydrophilic polyphenylsulfone dye desalination membrane material. Dissolve polyvinylpyrrolidone with a molecular weight of 10,000Da, acrylonitrile-maleic anhydride, titanium dioxide and polyphenylsulfone with a molecular weight of 3,000Da in N,N-dimethylformamide, and mix them uniformly to prepare the raw material for casting liquid , wherein the mass content of polyvinylpyrrolidone is 15%, the mass content of polyphenylsulfone is 15%, the content of acrylonitrile-maleic anhydride is 5%, the content of titanium dioxide is 0.1%, N,N-dimethyl The mass content of formamide is 64.9%. Control the room temperature at 15°C and the humidity at 30%, pour the film-making solution evenly on the glass plate, adjust the height of the scraper to 10 μm, and the scraping speed to 5m·min -1 . After scraping, wait for the film to stay in the air for 3 seconds, then put it into a coagulation bath filled with deionized water (50°C), wait for the film embryo body to ...

Embodiment 2

[0037] The method prepares a hydrophilic polyphenylsulfone dye desalination membrane material. Polyvinylpyrrolidone with a molecular weight of 36,000Da, acrylonitrile-maleic anhydride, polyphenylsulfone with a molecular weight of 5,000Da and nanoparticles of zirconium dioxide were dissolved in N,N-dimethylacetamide and mixed uniformly to prepare Casting solution raw materials, wherein the mass content of polyvinylpyrrolidone is 0.1%, the mass content of polyphenylsulfone is 25%, the content of acrylonitrile-maleic anhydride is 0.1%, and the content of zirconium dioxide nanoparticles is 5%. , The mass content of N,N-dimethylformamide is 69.8%. Control room temperature is 30 ℃, humidity is 70%. The casting solution prepared is used as the spinning solution, and the mixture of 80% acetone and 20% deionized water is injected into the inner core channel. The extrusion rate of the core solution is 20 ml / min, and the extrusion rate of the casting solution is 18 ml / min. minute. Aft...

Embodiment 3

[0040] The method prepares a hydrophilic polysulfone dye desalination membrane material. Polysulfone with a molecular weight of 3,500Da, polyvinylpyrrolidone with a molecular weight of 55,000Da, acrylonitrile-maleic anhydride, and inorganic particles of zirconia are dissolved in dimethyl sulfoxide, and mixed uniformly to prepare the casting liquid raw materials. Among them, poly The mass content of sulfone is 25%, the content of acrylonitrile-maleic anhydride is 1%, the content of aluminum oxide is 2.5%, the content of polyvinylpyrrolidone is 15%, and the content of N-methylpyrrolidone is 56.5%. Control the room temperature at 30°C and the humidity at 70%, pour the film-making solution evenly on the glass plate, adjust the height of the scraper to 300 μm, and the scraping speed to 50m·min -1 . After scraping, wait for the film to stay in the air for 15 seconds, then put it into a coagulation bath filled with deionized water (25°C), wait for the film embryo body to solidify in...

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Abstract

The invention relates to a hydrophilic polysulfone-type membrane and a preparation method thereof. The polysulfone-type membrane is composed of: a polysulfone polymer, a compound membrane composed of acrylonitrile-maleic anhydride polymer, and a dopamine layer coating the compound membrane. With the polysulfone polymer as a membrane material, a less amount of the acrylonitrile-maleic anhydride polymer is added to a membrane producing liquid; because the polymer contains large amount of carboxyl group, hydrophilicity of the membrane is significantly improved. Then the membrane is coated with the dopamine for several times, so that the hydrophilicity of the membrane is further improved, and pore size of the membrane is further reduced; after modification, the hydrophilicity of the membrane is significantly improved, and the pore size is changed from the range of ultra-filtration to nano-filtration. The nano-filtration membrane allows inorganic salts and small molecules to pass through while dye large molecules are blocked, so that the membrane can be used for desalting dyes. The modified membrane, when being used for desalination of direct red dye, can reach 80-99% in retention rate.

Description

technical field [0001] The invention relates to the field of preparation of organic membranes, in particular to a hydrophilic polysulfone membrane and a preparation method thereof, that is, research on the hydrophilic modification of the polysulfone membrane and its pore size modification. Background technique [0002] The dye industry is an important part of the chemical industry, which occupies an important position in the national economy. The traditional production process not only produces a large amount of waste water with high salinity, high chroma, and high COD, which seriously pollutes the environment, but also brings The salt content reduces the purity of the dye and affects the solubility and colorability of the dye. Nanofiltration membrane treatment technology is a pressure-driven membrane separation process between ultrafiltration and reverse osmosis. The relative molecular mass of most water-soluble dyes is just within the molecular mass cut-off range of nanofi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D71/68B01D71/42B01D67/00B01D69/02B01D69/06B01D69/08
CPCB01D67/0013B01D67/0088B01D69/02B01D69/06B01D69/08B01D69/088B01D71/42B01D71/68B01D71/76B01D2325/02B01D2325/36
Inventor 李卫星殷秋邢卫红
Owner NANJING UNIV OF TECH
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