Cross-linked sulfonated polysulfone/polyether sulfone-sulfonated polysulfone composite membrane and manufacturing method thereof

A technology of sulfonated polysulfone and composite membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of poor anti-pollution ability, less hydrophilic groups in the membrane separation layer, and low small molecule separation ability and other issues, to achieve the effect of good separation performance

Inactive Publication Date: 2015-04-22
张一琛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the active groups of m-phenylenediamine and trimesoyl chloride are consumed in the interfacial polymerization, resulting in less hydrophilic groups and poor hydrophilicity in the membrane separation layer itself.
[0007] Among the currently used polymer materials for preparing separation membranes, polysulfone has many good mechanical properties, chemical stability, and easy film formation, but this polymer has many defects that limit its application: (1) poor hydrophilicity : The pure water flux of the prepared polysulfone membrane is very low
(2) Low separation ability of small molecules: generally used in ultrafiltration membranes, and has not been used in nanofiltration membranes alone so far
(3) Poor anti-pollution ability
Although sulfonated polysulfone has good hydrophilicity, the film-forming performance of sulfonated polysulfone alone is not good
What's more serious is that when the degree of sulfonation of sulfonated polysulfone exceeds a certain value, sulfonated polysulfone will swell in water, making it unusable in the field of water treatment. A report on the separation membrane made of polysulfone for desalination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 12 grams of polyethersulfone, 9 grams of sulfonated polysulfone (sulfonated degree of 10%), 5 grams of additive polyethylene glycol and 74 grams of dimethylacetamide into a three-necked flask, at 60 ° C Stir evenly for more than 6 hours until the solute is completely dissolved to obtain the casting solution. Polyethersulfone / sulfonated polysulfone blend base membrane was prepared on non-woven fabric by immersion precipitation phase inversion method. Soak in pure water for 2-3 days, take out and dry for later use.

[0036] The film-making process parameters are: ambient temperature 15-30°C, ambient relative humidity 30-90%, air residence time 0-60s, scraper thickness 150-250μm, coagulation bath temperature 5-50°C, non-woven fabric thickness 50-100μm between.

[0037] The thickness of the prepared polyethersulfone / sulfonated polysulfone base membrane is between 50 and 150 μm. The obtained basement membrane has an asymmetric structure, and the cross-section show...

Embodiment 2

[0042] Basement membrane preparation condition is the same as example 1; 5 grams of sulfonated polysulfone (sulfonated degree is 50%), 9 grams of crosslinking agent polyethylene glycol 200 (PEG200) and 86 grams of water and isopropanol blend Add the solvent into a three-necked flask, and stir evenly at room temperature for more than 3 hours until the solute is completely dissolved to obtain a coating solution. Membrane separation layer coating method is the same as example 1.

[0043] According to the conventional nanofiltration membrane performance evaluation method, the pure water flux of the membrane is 12.6L / (m 2 h), the sodium sulfate rejection rate of 1g / L is 80%, the rejection rate of PEG600 is 86.4%, and the rejection rate of methyl red is 83%.

Embodiment 3

[0045] Basement film preparation condition is the same as example 1; 3 grams of sulfonated polysulfone (sulfonated degree is 50%), 9 grams of crosslinking agent polyethylene glycol 200 (PEG200) and 88 grams of water and isopropanol blend Add the solvent into a three-necked flask, and stir evenly at room temperature for more than 3 hours until the solute is completely dissolved to obtain a coating solution. Membrane separation layer coating method is the same as example 1.

[0046] According to the conventional nanofiltration membrane performance evaluation method, the pure water flux of the membrane is 13.26L / (m 2 h), the rejection rate of sodium sulfate to 1g / L is 78.3%, the rejection rate of PEG600 is 80.3%, and the rejection rate of methyl red is 81%.

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Abstract

The invention relates to a cross-linked sulfonated polysulfone/polyether sulfone-sulfonated polysulfone composite membrane and a manufacturing method of the cross-linked sulfonated polysulfone/polyether sulfone-sulfonated polysulfone composite membrane. Polyhydroxyl or multi-amino or hyperbranched substances are selected, a polyether sulfone/sulfonated polysulfone blended ultra-filtration base membrane is coated with a cross-linked sulfonated polysulfone solution to manufacture the composite membrane, a composite membrane separation layer of which the thickness is 1 micrometer-10 micrometers is formed on the surface of the base membrane, the water contact angle of the surface of the composite membrane separation layer ranges from 40 degrees to 90 degrees, and the composite membrane separation layer has good osmosis and separation properties. The manufacturing method includes the steps that sulfonated polysulfone of different concentrations and sulfonation degrees, m-phenylenediamine, polyethylene glycol, dopamine, H30 and other cross-linking agents are dissolved in solvent to manufacture the coating solution, with the polyether sulfone/sulfonated polysulfone blended ultra-filtration being the base membrane, the composite membrane separation layer is manufactured under vacuum conditions, and finally the cross-linked sulfonated polysulfone/polyether sulfone-sulfonated polysulfone composite membrane which is hydrophilic is obtained. The manufactured composite membrane has the good osmosis and separation properties, and can be used for nanofiltration and forward osmosis processes and membrane separation processes including seawater desalting, waste water treatment, domestic water treatment and bio-separation.

Description

technical field [0001] The invention relates to a polymer special functional separation membrane and a preparation method thereof, in particular to a method for preparing a composite membrane by coating and crosslinking. Background technique [0002] The demand for membrane technology in the production process of water treatment and seawater desalination is increasingly urgent. However, the divalent salt contained in water has a very serious impact on water treatment and seawater desalination processes, and the use of nanofiltration and forward osmosis processes can effectively remove divalent salt in seawater. Therefore, it is necessary to develop a separation membrane that has a better interception effect on divalent salts and remove divalent salts that are prone to scale, so as to realize the efficient use of seawater desalination and achieve the purpose of reducing costs and increasing production. [0003] Composite membrane method is the most widely used and most effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/68B01D67/00
Inventor 张一琛刘志光张磊
Owner 张一琛
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