High-performance nanofiltration composite membrane containing polymer coating layer

A polymer coating and nanofiltration membrane technology, applied in membrane technology, semi-permeable membrane separation, reverse osmosis, etc., can solve the problems of low flux and poor desalination performance of nanofiltration membranes, and achieve easy-to-obtain materials and introduce coatings The effect of simple layer method, high desalination performance and throughput

Inactive Publication Date: 2019-11-26
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-cost, easy-to-operate separation membrane material and its preparation method, especially a high-performance nanofiltration composite membrane containing a polymer coating and its preparation, which mainly solves the problem of desalination of nanofiltration membranes in the prior art. Poor performance and low flux technical problems, and using this technology to prepare nanofiltration membranes with high desalination performance

Method used

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  • High-performance nanofiltration composite membrane containing polymer coating layer
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  • High-performance nanofiltration composite membrane containing polymer coating layer

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Embodiment 1

[0040] The membranes of the present invention were prepared as follows. Oxygen plasma modification can be carried out on the upper surface of the porous support layer polyethylene film (the scope of the thickness is not limited, such as commonly used about 100 microns, and the existing polyethylene film can be used), and other hydrophilic modifications can also be used, such as Coating PVA; after taking it out, pour the aqueous solution of triethylenetetramine, monoethanolamine and dimethylaminopyridine on the upper surface of the support layer, keep the solution in contact with the support layer for 2 minutes, and blow the liquid on the surface of the membrane with nitrogen after pouring it out. Dry, then pour 0.15% Isopar G solution containing trimesoyl chloride on the support layer, keep the organic solution in contact with the support layer for 1 min, and then pour it off. Then place it in an oven at 90°C for 3 minutes to evaporate the solvent. Then pour sulfonated polyet...

Embodiment 2

[0044] The membranes of the present invention were prepared as follows. Pour the sulfonated polyetheretherketone / methanol solution on the surface of the polysulfone porous support layer at a ratio of 20 / 80, keep the solution with the porous support layer for 2s, then pour it out, and then place it in an oven at 30°C for 2h. After taking it out, pour the aqueous solution of diethylenetriamine and dimethylaminopyridine on the upper surface of the support layer, keep the solution in contact with the support layer for 2 minutes, and after pouring it out, dry the liquid on the surface of the membrane with nitrogen, and then pour it on the support layer Pour over 0.32% Isopar G solution containing 1,3,6-naphthalenetrisulfonyl chloride, keep the organic solution in contact with the support layer for 1 min, and then pour it off. Then place it in an oven at 90°C for 3 minutes to evaporate the solvent. The results are shown in the appendix of the manual figure 1 , Figure 4 and Fig...

Embodiment 3

[0047] The membranes of the present invention were prepared as follows. Pour the aqueous solution of diethylenetriamine and dimethylaminopyridine on the upper surface of the porous support layer polysulfone, keep the solution in contact with the support layer for 2min, after pouring it out, dry the membrane surface liquid with nitrogen, and then place it on the support A 0.32% Isopar G solution containing 1,3,6-naphthalenetrisulfonyl chloride was poured over the layer, and the organic solution was kept in contact with the support layer for 1 min, then poured off. Then place it in an oven at 90°C for 3 minutes to evaporate the solvent. The results are shown in the appendix of the manual image 3 , Figure 5 and Figure 7 . image 3 The interfacial aggregation layer compared to figure 1 , figure 2 Look thicker, Figure 5 compared to Figure 4 The surface roughness of the film is large, Figure 7 It shows that the stability and compaction resistance of the composite mem...

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Abstract

The invention relates to a preparation method of a high-performance nanofiltration composite membrane containing a polymer coating layer. The preparation method comprises following steps: a polymer coating layer is introduced onto the surface of a porous supporting membrane; solvent volatilization treatment is carried out; interface polymerization is carried out on the supporting material containing the polymer coating layer, wherein the monomers adopted in interface polymerization are polyamines and poly acyl chlorides; after interface polymerization reaction, heat crosslinking treatment is carried out; or before introduction of the polymer coating layer, interface polymerization reaction is carried out on the surface of the porous supporting membrane. The adopted porous supporting material is prepared from a polymer material such as polysulfones, polyethersulfones, polyether ether ketones, polycarbonates, polyvinylidene fluoride, polyacrylonitrile, polyethylene, polypropylene, or inorganic porous materials such as alumina and titanium dioxide ceramic materials. The preparation method is capable of avoiding the seesaw effect of permeability and interception performance of nanofiltration and reverse osmosis membranes, and obtaining the nanofiltration membrane high in permeability and retention rate. The preparation method is low in cost, and simple in operation, and great meaning in the field of membrane material wide applications and circular economy is achieved.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a preparation method of a high-performance nanofiltration composite membrane containing a polymer coating and the obtained membrane material. Background technique [0002] Membrane technology has been relatively mature and one of the most important technologies in water treatment and environmental protection. The most typical one is the nanofiltration membrane, which can intercept multivalent ions, so as to realize the selective separation of ions. Among the preparation methods of commercial nanofiltration membrane selective skin layer, the interfacial polymerization method is the most common. However, it is difficult to simultaneously improve the flux and separation performance of nanofiltration membranes through existing interfacial polymerization methods. In recent years, it has been reported in patent literature that introducing a thin composite layer between the interfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/02B01D71/26B01D71/34B01D71/38B01D71/42B01D71/44B01D71/50B01D71/68
CPCB01D61/027B01D67/0006B01D67/0079B01D69/12B01D71/024B01D71/025B01D71/26B01D71/34B01D71/38B01D71/42B01D71/44B01D71/50B01D71/68
Inventor 何涛朱叶宋健峰窦鹏佳徐姗姗肖泽淳
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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