Polysulfonamide nanofiltration or reverse-osmosis composite membrane, and preparation method thereof

A reverse osmosis composite membrane and polysulfonamide nanotechnology, which is applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of high surface roughness, low desalination rate of composite membrane, poor stability of large-scale production, etc. question

Inactive Publication Date: 2017-09-05
青岛致用新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art above, the technical problem to be solved in the present invention is to provide a polysulfonamide nanofiltration or reverse osmosis composite membrane and its preparation method, which can effectively solve the problem of low desalination rate and surface roughness of the composite membrane in the prior art. Problems of high and large-scale production with poor stability

Method used

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  • Polysulfonamide nanofiltration or reverse-osmosis composite membrane, and preparation method thereof
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  • Polysulfonamide nanofiltration or reverse-osmosis composite membrane, and preparation method thereof

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preparation example Construction

[0037] In the process of membrane preparation, in order to improve the performance of polysulfonamide nanofiltration or reverse osmosis composite membrane and prepare nanofiltration or reverse osmosis composite membrane with smoother surface, polymer coating can be introduced. The introduction of the polymer coating can be carried out before the layer-by-layer assembly preparation process. At this time, the polymer coating is applied to the surface of the porous support membrane; it can also be carried out during the layer-by-layer assembly preparation process. At this time, the The polymer coating is applied to the surface of the nascent nanofiltration or reverse osmosis membrane. It can be assembled by introducing a layer of coating at a time, or it can be assembled several times before introducing a layer of coating; it can also be assembled layer by layer. After completion, the polymer coating is applied to the surface of the outermost nascent nanofiltration or reverse osmo...

Embodiment 1

[0042] After fully washing the polysulfone support membrane with 30wt% ethanol aqueous solution, soak it in a mixed solution of 1% piperazine aqueous solution and 2% triethylamine for 2 minutes, and then soak it in 0.02% 1,3,6-naphthalenetrisulfonyl chloride Soak in toluene solution for 1 min, and assemble layer by layer through reaction; repeat the above steps 8 times to prepare 8-layer thick nascent polysulfonamide nanofiltration or reverse osmosis composite membrane, heat treatment at 90°C for 15 min, and use pH 3 Wash with aqueous hydrochloric acid.

[0043] The performance of the polysulfonamide nanofiltration or reverse osmosis composite membrane obtained by this method is as follows:

[0044]

Embodiment 2

[0046] After fully washing the polysulfone support membrane with 30wt% ethanol aqueous solution, put a mixed solution of 1% piperazine aqueous solution and 2% triethylamine to spray on the polysulfone support membrane, spray 0.02% 1,3,6- The toluene solution of naphthalenetrisulfonyl chloride was reacted; the above steps were carried out 8 times alternately to prepare 8-layer thick nascent polysulfonamide nanofiltration or reverse osmosis composite membranes. washing.

[0047] The performance of the polysulfonamide nanofiltration or reverse osmosis composite membrane obtained by this method is as follows:

[0048]

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Abstract

The invention discloses a polysulfonamide nanofiltration or reverse-osmosis composite membrane, and a preparation method thereof. the preparation method for the polysulfonamide nanofiltration or reverse-osmosis composite membrane comprises the following steps: pretreatment of a porous supporting membrane; alternate layer-upon-layer assembling of a sulfonyl chloride organic-phase solution and a polyamine water-phase solution on the surface of the porous supporting membrane via reaction; heat treatment; etc.; wherein heat treatment can be carried out during or after layer-upon-layer assembling. Nanoparticles, a surfactant, a catalytic acid absorbent or catalyst, a pore forming agent and other additives are added into the sulfonyl chloride organic-phase solution and the polyamine water-phase solution. The polysulfonamide nanofiltration or reverse-osmosis composite membrane prepared by using the method has improved desalination performance and acid resistance, smoother surface and lower roughness compared with composite membranes prepared through traditional interfacial polymerization, and has good application prospects in the fields of nanofiltration and reverse osmosis.

Description

technical field [0001] The invention relates to a polymer composite membrane, in particular to a polysulfonamide nanofiltration or reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] Since the industrial application of aromatic polyamide interfacial polymerization technology to prepare reverse osmosis and nanofiltration membrane materials, nanofiltration and reverse osmosis membrane separation technology has been increasingly used in water treatment fields such as seawater desalination, reclaimed water reuse, sewage treatment, and drinking water preparation. Wide range of applications. At present, the mainstream roll nanofiltration or reverse osmosis composite membrane surface functional skin is still based on the polyamide formed by polyacyl chloride (such as 1,3,5-benzenetricarboxylic acid chloride) and polyamine (such as m-phenylenediamine or piperazine). Prepared by cross-linked network structure. The above-mentioned monom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D69/02B01D61/02
CPCB01D61/025B01D61/027B01D69/02B01D69/105B01D69/125B01D71/56B01D2323/26B01D2325/30Y02A20/131
Inventor 牛青山袁涛胡月芳郭鑫李鹏
Owner 青岛致用新材料科技有限公司
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