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Preparation method for interfacial polymerization composite membrane

A technology of interfacial polymerization and composite membranes, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve problems such as difficulty in achieving high-performance separation membranes, difficulty in expanding production scale, time-consuming steps, etc., to achieve Good industrial applicability, low cost of raw materials, effect of increased performance

Active Publication Date: 2019-10-11
朱军勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many modification methods, such as preparing high-performance polyamide or polyester amide composite membranes by adding nanoparticles, inserting interlayers, and controlling the diffusion rate of monomers, these steps are complicated and costly, and it is difficult to expand the scale of production
[0005] For commercial polyamide composite membranes, although mainly prepared by interfacial polymerization, the support provided by the base membrane is indispensable
Therefore, it is necessary to prepare the polymer base film first, and then sequentially impregnate the water phase and the oil phase to complete the entire process, which is time-consuming and cumbersome.
The interfacial polymerization composite membrane obtained by this method generally has a very thick selective layer, and it is difficult to reach the level of a high-performance separation membrane.
In addition, the traditional impregnation method requires a large amount of water-phase monomers to prepare a water-phase solution, so the cost is high
The current commercial interfacial polymerization composite membrane continues to simplify the preparation process and reduce the cost on the basis of the existing process, and it is very challenging to improve the separation performance of the composite membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of an interfacial polymerization composite membrane, the steps are as follows:

[0028] (1) Dissolve 7.5 g of polyethersulfone and 0.2 g of piperazine in 42.3 g of dimethyl sulfoxide solvent, and stir overnight to obtain a polyethersulfone casting solution with a concentration of 15 wt%.

[0029] (2) Let the prepared casting solution stand for defoaming, and then apply it on the non-woven fabric by an automatic scraper machine, the thickness of the scraper is 250 μm, and then immerse the non-woven fabric coated with the polymer solution in deionized water , take out the polyethersulfone membrane after 2min phase inversion;

[0030] (3) Use filter paper to remove the remaining liquid on the surface of the membrane, then immerse the membrane in a 0.04 wt% trimesoyl chloride-n-hexane solution for 1 min, and then treat it in an oven at 40°C for 10 min to obtain a composite nanofiltration membrane.

[0031] Separation membrane performance test:

[0032...

Embodiment 2

[0038] A preparation method of an interfacial polymerization composite membrane, the steps are as follows:

[0039] (1) Weighing 7.5 g of polyethersulfone and 2 g of piperazine were dissolved in 42.3 g of dimethylformamide solvent, and stirred overnight to obtain a polyethersulfone casting solution with a concentration of 15 wt%.

[0040] (2) Let the prepared casting solution stand for defoaming, and then apply it on the non-woven fabric by an automatic scraper machine, the thickness of the scraper is 250 μm, and then immerse the non-woven fabric coated with the polymer solution in deionized water , take out the polyethersulfone membrane after 30min phase inversion;

[0041] (3) Use filter paper to remove the remaining liquid on the surface of the membrane, then immerse the membrane in a 4 wt% trimesoyl chloride-n-hexane solution for 30 seconds, and then treat it in an oven at 40°C for 10 minutes to obtain a composite nanofiltration membrane.

[0042] The composite membrane f...

Embodiment 3

[0047] A preparation method of an interfacial polymerization composite membrane, the steps are as follows:

[0048] (1) Dissolve 8 g of polysulfone and 0.4 g of piperazine in 41.6 g of N-methylpyrrolidone and stir overnight to obtain a polysulfone casting solution with a concentration of 16 wt% containing piperazine monomer;

[0049] (2) Leave the prepared casting solution to stand for defoaming, and then apply it on the non-woven fabric by an automatic scraper machine, the thickness of the scraper is 250 μm, and then immerse the non-woven fabric coated with the polymer solution into the deionized aqueous solution In the process, take out the polysulfone membrane after 2min phase inversion;

[0050] (3) Use filter paper to remove the remaining liquid on the surface of the membrane, then immerse the membrane in a 0.2 wt% trimesoyl chloride-n-hexane solution for 1 min, and then treat it in an oven at 90°C for 1 min to obtain a composite nanofiltration membrane.

[0051] The pre...

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PUM

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Abstract

The invention provides a preparation method for an interfacial polymerization composite membrane. The preparation method comprises the steps that a water-soluble monomer is dissolved into a polymer solution (or a casting solution), the casting solution is wiped to a non-woven fabric by using a membrane wiper, and then the non-woven fabric is soaked into a coagulating bath for phase transformation;by controlling the phase transformation time, the concentration of the monomer in a polymer membrane, and the polymer-based membrane containing the water-soluble monomer is formed; the polymer-basedmembrane is taken out, the liquid remaining on the surface of the membrane is removed by using filter paper, an oil-phase solution is poured onto the surface of the polymer, and after a reaction, drying is conducted to obtain the composite membrane. According to the preparation method, an existing technical process for preparing a polyamide or polyesteramide composite membrane can be simplified toa great extent, the composite membrane is high in throughput and high in selectivity, and compared with a traditional preparation method, the performance is obviously improved. Besides, the method issuitable for a conventional polymer, the using amount of the water-soluble monomer is greatly reduced, the method is simple in process, easy to prepare anhd low in raw material cost, and preparationis high in industrial applicability.

Description

technical field [0001] The invention relates to the field of separation membrane preparation, in particular to a method for preparing an interface polymerization composite membrane. Background technique [0002] Nanofiltration membranes and reverse osmosis membranes are a common type of composite membranes. The currently commercialized nanofiltration and reverse osmosis composite membranes are mainly prepared by interfacial polymerization. This kind of composite membrane is generally composed of non-woven fabric, porous base membrane and ultra-thin polyamide or polyester amide separation layer formed by interfacial polymerization. [0003] Interfacial polymerization refers to a rapid and irreversible polymerization reaction of water-phase monomers and oil-phase monomers at the water-oil interface. Among them, the porous support base membrane is generally an ultrafiltration membrane, which plays a role in supporting the composite film during the interfacial polymerization pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/02
CPCB01D61/025B01D61/027B01D67/0006B01D69/12
Inventor 朱军勇田苗苗刘彦玲王景
Owner 朱军勇
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