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A kind of method for preparing positively charged nanofiltration membrane by chloromethylated polysulfone

A technology of chloromethylation and positive charge, which is applied in the field of polymer membrane preparation and can solve the problems of poor anti-pollution performance and membrane intolerance to pollution, etc.

Active Publication Date: 2019-06-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polysulfone material is hydrophobic, and its anti-fouling performance is poor, and the membrane prepared by it is not resistant to fouling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 30g of chloromethylated polysulfone into 300g of trimethylamine aqueous solution with a mass fraction of 5%, stir magnetically for 24 hours at a speed of 800-1500r / min, vacuum filter to remove excess trimethylamine solution, and store at 35°C Vacuum drying to obtain positively charged polysulfone;

[0015] Add 10g of positively charged polysulfone to 500ml of ethylene glycol methyl ether, stir at room temperature at 800-1500r / min for 24 hours, vacuum filter, take the upper transparent mother liquor, and then take 20g of the mother liquor to dry Determination of the content of solute in the solution;

[0016] Take the mother liquor and add ethylene glycol methyl ether to configure 50g of casting solution, the concentration of the casting solution is 0.85% of the mass fraction of positively charged polysulfone, and then evenly coat the casting solution on the polysulfone ultrafiltration bottom membrane After standing for 10 minutes, the excess casting solution was re...

Embodiment 2

[0020] The concentration of the film-forming material in the film-casting solution was changed, and the other steps were the same as in Example 1. Under the pressure of 1.2MPa, the rejection rate and permeation flux of the membrane to magnesium chloride and sodium chloride are as follows:

[0021] .

Embodiment 3

[0023] The number of times of coating during film making was changed, and other steps were the same as in Example 1. Under the pressure of 1.2MPa, the rejection rate and permeation flux of the membrane to magnesium chloride and sodium chloride are as follows:

[0024] .

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Abstract

The invention discloses a method for preparing a charged nanofiltration membrane by chloromethylated polysulfone. According to the invention, chloromethylated polysulfone is placed in a trimethylamine solution to obtain a positively charged polysulfone material, then the material is subjected to magnetic stirring for 24 h, the positively charged polysulfone material is placed in ethylene glycol monomethyl ether to prepare a casting solution, the casting solution is used for coating the surface of a polysulfone ultrafiltration base membrane, and the base membrane is dried in a temperature scope of 30-40 DEG C to prepare the nanofiltration membrane; under pressure of 1.2 MPa, the nanofiltration membrane has retention rate and flux on sodium chloride and magnesium chloride being 69.3% / 52.6 L.m<-2>.h<-1> and 76.8% / 40.6 L.m<-2>.h<-1>. The film forming material contains a positively charged group, the retention rate of a positively charged dye by the membrane can reach 95% and above, the charged nanofiltration membrane can be used for separating the salt and the positively charged dye, the nanofiltration membrane has the hydrophilic group, and has good anti-pollution performance.

Description

technical field [0001] The invention belongs to the field of polymer membrane preparation, and in particular relates to a method for preparing a positively charged nanofiltration membrane from chloromethylated polysulfone. Background technique [0002] In recent years, the separation performance of the membrane has been continuously optimized, but whether it is in the laboratory research stage or has been industrialized, nanofiltration membranes have encountered some problems, such as membrane fouling, membrane oxidation and chlorine resistance. Therefore, it is necessary to explore new film-making materials and film-making processes. Polysulfone is a kind of engineering plastic with high temperature resistance and high mechanical strength, which has excellent creep resistance, and after the emergence of bisphenol A polysulfone materials, it has become the most important membrane material at the present stage after cellulose derivatives. Sulfonated polysulfone is generally ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/12B01D69/02B01D67/00B01D61/00C02F1/44C02F101/12C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01D61/027B01D67/0013B01D69/02B01D69/12B01D71/68B01D2325/16B01D2325/30B01D2325/36C02F1/442C02F2101/12C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 周勇余亚伟高从堦
Owner ZHEJIANG UNIV OF TECH
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