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Preparation method of hydrophilic anti-pollution aromatic polyamide reverse-osmosis membrane

A technology of aromatic polyamide and reverse osmosis membrane, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of anti-pollution characteristics, flux and interception performance, and achieve good chemical stability properties and physical stability, overall roughness reduction, and good hydrophilicity

Inactive Publication Date: 2019-04-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a hydrophilic anti-pollution aromatic polyamide reverse osmosis membrane in order to solve the problem that the existing reverse osmosis membrane has hydrophilic and anti-pollution characteristics, flux and interception performance.

Method used

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  • Preparation method of hydrophilic anti-pollution aromatic polyamide reverse-osmosis membrane

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specific Embodiment approach 1

[0018] Embodiment 1: This embodiment records a method for preparing a hydrophilic anti-pollution aromatic polyamide reverse osmosis membrane. The steps of the preparation method are as follows:

[0019] (1) The polysulfone (PSf) base membrane was soaked in deionized water for 24 h, rinsed, dried, fixed in a polytetrafluoroethylene frame, and m-phenylenediamine (MPD) and dimethyl diamine were poured on its surface. Aqueous solution of allyl ammonium chloride (DADMAC), then let it stand for 5~10 minutes, and the excess aqueous solution was removed by blowing with an air knife;

[0020] (2) Pour the n-hexane solution of trimesoyl chloride (TMC) into the surface of the membrane obtained in (1), and carry out interfacial polymerization at room temperature for 60 s;

[0021] (3) Pour the aqueous solution of hydrophilic olefin monomer into the surface of the membrane obtained in (2), place the membrane fixed on the polytetrafluoroethylene frame together with the frame in a glass irra...

specific Embodiment approach 2

[0024] Specific embodiment two: the preparation method of a hydrophilic anti-pollution aromatic polyamide reverse osmosis membrane described in specific embodiment one, in step (1), the mass percentage of m-phenylenediamine is 0.1%~3 %, the mass percentage of dimethyl diallyl ammonium chloride is 0.1%~3%.

specific Embodiment approach 3

[0025] Specific embodiment three: the preparation method of a hydrophilic anti-pollution aromatic polyamide reverse osmosis membrane described in specific embodiment one, in step (2), the mass volume ratio of trimesoyl chloride to n-hexane is 0.1~0.5g: 500mL.

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Abstract

The invention relates to a preparation method of a hydrophilic anti-pollution aromatic polyamide reverse-osmosis membrane, and belongs to the technical field of modification preparation of high-performance reverse-osmosis membranes. The preparation method includes the following steps that a polysulfone-base membrane is soaked in deionized water, then blow-dried, and fixed in a polytetrafluoroethylene frame, and a water solution of m-phenylenediamine and dimethyl diallyl ammonium chloride is poured onto the surface of the polysulfone-base membrane; an n-hexane solution of trimesoyl chloride isthen poured for an interface polymerization reaction; a water solution of hydrophilic olefin type monomers is poured onto the surface of the membrane, irradiation treatment is conducted with gamma-rays, and a modified membrane is obtained; the modified membrane is cleaned and dried. The preparation method has the advantages that macromolecule hydrophilic dimethyl diallyl ammonium chloride is grafted onto the surface of a polyamide separation layer, accordingly, good hydrophilicity is realized, the overall roughness of the surface of the reverse-osmosis membrane is reduced, and depositing and adsorbing of contaminants on the surface of the membrane can be reduced. Meanwhile, the macromolecule hydrophilic dimethyl diallyl ammonium chloride is grafted onto the surface of the polyamide separation layer to form a specific water channel, and therefore the performance of the reverse-osmosis membrane is improved.

Description

technical field [0001] The invention belongs to the technical field of modification and preparation of high-performance reverse osmosis membranes, and in particular relates to a preparation method of a hydrophilic anti-pollution aromatic polyamide reverse osmosis membrane. Background technique [0002] As we all know, reverse osmosis membrane technology has great advantages in terms of comprehensive energy consumption and resource cost, and plays a leading role in seawater desalination and sewage treatment industries. Thin film composite polyamide membrane is currently the most used reverse osmosis membrane, which has high flux and salt rejection rate, large operating temperature and pH adjustment range, and easy operation. Despite these advantages, polyamide reverse osmosis membranes still face serious pollution challenges. Polyamide reverse osmosis membranes are inherently sensitive to pollutants. Due to the accumulation of pollutants in seawater desalination and wastewat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/02B01D67/00B01D61/02
CPCB01D71/56B01D61/025B01D67/0006B01D69/02B01D2325/36
Inventor 张春华刘超王超刘宏鹏曹莹莹
Owner HARBIN INST OF TECH
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