Method for preparing quaternized chitosan modified polysulfone ultrafiltration membrane

A technology of quaternized chitosan and polysulfone ultrafiltration membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Simple preparation method and improved hydrophilicity

Active Publication Date: 2014-01-08
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polysulfone is a hydrophobic material, which is easy to cause membrane fouling and reduces membrane life. One of the effective ways to improve hydrophobicity and the anti-pollution of the membrane caused by it is to blend, through the water-soluble quaternized chitosan The solution is blended with the polysulfone solution to form a casting solution to form a membrane, which can improve the hydrophilicity and selectivity of the membrane, and prepare a new type of charged ultrafiltration membrane

Method used

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  • Method for preparing quaternized chitosan modified polysulfone ultrafiltration membrane
  • Method for preparing quaternized chitosan modified polysulfone ultrafiltration membrane
  • Method for preparing quaternized chitosan modified polysulfone ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 19g of polysulfone and 1g of anhydrous zinc chloride into 70g of N-methylpyrrolidone, heat and stir to dissolve into a casting solution, vacuum defoam the solution for 2 hours, let it stand for 2 hours, and spread the solution evenly Cover the polyester non-woven fabric, scrape the liquid film into a uniform thickness with a scraper, and immerse it in pure water to undergo a phase inversion reaction to form a film.

[0018] The removal rate of the membrane for bovine serum albumin is 97.5%, and the pure water flux is 45L / m 2 .h.

Embodiment 2

[0020] Put 19g of polysulfone and 1g of anhydrous zinc chloride into 70g of N-methylpyrrolidone, heat at 60°C and stir to dissolve into a homogeneous solution A. The dissolution process after heating is easier and more convenient, and the uniformity of dissolution is better; Put 0.5g of quaternized chitosan into 9.5g of dimethyl sulfoxide and stir to dissolve into a homogeneous solution B, and use the solution blending method to mix the two solutions of A and B into a homogeneous solution, which is the required casting solution , after vacuum degassing the mixed solution for 2 hours, let it stand for another 2 hours to ensure that the air bubbles in the mixed solution are removed, apply the solution evenly on the polyester non-woven fabric, and scrape the liquid film into a uniform thickness with a scraper Finally, immerse into pure water to form a phase inversion reaction to form a film. The above-mentioned film scraping process is a conventional method in the industry, and th...

Embodiment 3-6

[0023] According to the same steps of Example 2, change the feeding amount of polysulfone and N-methylpyrrolidone in the A solution, other steps are the same as in Example 2, prepare a composite membrane and test, the results are as follows:

[0024]

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Abstract

The invention discloses a method for preparing a polymer membrane, in particular to a method for preparing a quaternized chitosan modified polysulfone ultrafiltration membrane. The method includes jointly putting polysulfone and anhydrous zinc chloride in an N-methyl pyrrolidone, stirring and dissolving to obtain a uniform solution A; putting quaternized chitosan in dimethyl sulfoxide, stirring and dissolving to obtain a uniform solution B; adopting a solution mixing method to mix the uniform solution A with the uniform solution B to obtain a uniform solution, namely a needed membrane casting solution; subjecting the mixed solution to vacuum defoaming for 2 hours, standing for 2 hours, uniformly coating the mixed solution on polyester non-woven cloth, and using a scraper to scrape a liquid membrane to be a membrane uniform in thickness; soaking the membrane in pure water for a phase inversion reaction to obtain the polysulfone ultrafiltration membrane. The method can be widely applied to enterprises of special separation.

Description

technical field [0001] The invention relates to a preparation method of a polymer film, in particular to a quaternized chitosan modified polysulfone ultrafiltration membrane and a preparation method thereof. Background technique [0002] Polysulfone itself has high mechanical strength, anti-compression, anti-oxidation and thermal stability, and is widely used in the field of membrane separation. However, polysulfone is a hydrophobic material, which is easy to cause membrane fouling and reduces membrane life. One of the effective ways to improve hydrophobicity and the anti-pollution of the membrane caused by it is to blend, through the water-soluble quaternized chitosan The solution is blended with the polysulfone solution to form a casting solution to form a membrane, which can improve the hydrophilicity and selectivity of the membrane, and prepare a new type of charged ultrafiltration membrane. [0003] Chitosan quaternary ammonium salt (Chitosan, CS) is the only alkaline ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00
Inventor 周勇翟丁陈可可高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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