Preparation method of polystyrolsulfon acid salt/polyethyleneimine crosslinking nanofiltration membrane

A technology of polystyrene sulfonate and polyethylene imine is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of good hydrophilicity, novel process, and easy control of process conditions.

Active Publication Date: 2012-06-27
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although nanofiltration technology has made great progress, the existing membrane materials cannot meet people's needs. Under the condition of not losing the rejection rate, the flux of the membrane needs to be further improved, and new monomers and new membranes are needed. Emergence of materials (U.S. Pat 4,769,148; U.S. Pat 4,259,183)

Method used

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  • Preparation method of polystyrolsulfon acid salt/polyethyleneimine crosslinking nanofiltration membrane
  • Preparation method of polystyrolsulfon acid salt/polyethyleneimine crosslinking nanofiltration membrane
  • Preparation method of polystyrolsulfon acid salt/polyethyleneimine crosslinking nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0034] Dissolve 1 g of sodium polystyrene sulfonate in 99 g of water, with a mass fraction of 1%, add a certain amount of polyethyleneimine and 0.05 g of glutaraldehyde, heat to 30 ° C, and stir well; remove the casting solution with a vacuum pump After soaking for 2 hours; then pour it into a metal frame with a porous support membrane, keep it for 2 minutes, scrape it into a liquid film of a certain thickness with a scraper; remove the casting liquid remaining on the surface of the porous support membrane with a rubber roller , put the support film scraped with casting liquid into a vacuum oven and heat it to 40°C, dry it in vacuum for 20 minutes to volatilize the solvent, then take it out and place it at an inclination of 75°, spray a 7% hydrochloric acid solution onto the film with a sprayer to polymerize After the product is gelled, continue to dry in a vacuum oven for 40 minutes, and wait for the solvent to evaporate completely; transfer it to an ordinary oven for heating ...

Embodiment 6-8

[0037]With other conditions unchanged, after adding an appropriate amount of polyethyleneimine, a small amount of acid solution was added dropwise under stirring to adjust the pH value to 3.

[0038]

Embodiment 9

[0039] Example 9, 10

[0040] Other conditions remain the same, as in Example 4-6, increase the amount of PEI and adjust the pH. When the pH value increases to 3, a large amount of viscous jelly is precipitated, and the solution appears turbid. After filtering the turbid solution, take the clear solution to form a membrane, and the method is the same as above.

[0041]

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Abstract

The invention discloses a preparation method of a macromolecule organic membrane, in particular to a preparation method of a polystyrolsulfon acid salt/polyethyleneimine crosslinking nanofiltration membrane. The preparation method comprises the following steps of: taking polystyrolsulfon acid salt and polyethyleneimine as solute, dissolving in water, compounding a layer of a crosslinking ultrathin function layer on a supporting membrane by means of spray gel, drying and gelling polymer with acid till that a composite membrane is formed. The preparation method has the advantages that the membrane compounding technology is novel, the technology condition is easily controlled, the nanofiltration membrane has good hydrophily and higher intensity, the crosslinking polymer is provided with a plurality of various charged functional groups to be capable of effectively adjusting the selection, the hydrophily, the hydrophobicity and the compatibility of the obtained membrane, and the composite membrane has higher interception to inorganic salt. The membrane prepared by the preparation method can be widely applied to various separation industries, in particular to the separation of water solution.

Description

technical field [0001] The invention relates to a preparation method of a polymer organic membrane, in particular to a preparation method of a polystyrene sulfonate / polyethyleneimine cross-linked nanofiltration membrane. technical background [0002] The nanofiltration composite membrane is to deposit an ultra-thin functional layer on the surface of a microporous support membrane with an appropriate pore size. The deposition methods mainly include surface coating, interfacial polycondensation and in-situ polymerization. Composite membranes have a number of advantages over asymmetric membranes: it allows each layer to be tailored for optimum performance. The ultra-thin functional layer can optimize the maximum selective permeability, and the support membrane can achieve the best strength and pressure tightness. [0003] Compared with ultrafiltration membrane and reverse osmosis membrane, nanofiltration membrane has high water flux and high rejection rate at lower operating p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/60B01D71/28B01D69/12B01D67/00
Inventor 周勇陈可可翟丁高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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