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Preparation method of a novel polyamide composite separation membrane

A separation membrane and polyamide technology, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of adverse effects on membrane performance, no obvious improvement in membrane anti-fouling performance, and easy agglomeration, etc., to achieve Good industrial application prospects, significant modification effect, and the effect of inhibiting agglomeration behavior

Active Publication Date: 2016-04-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyamide nanofiltration membranes and reverse osmosis membranes prepared by interfacial polymerization have been marketed, these membranes still face problems such as low water flux, high working pressure, and poor anti-pollution ability. Need to solve
[0004] In order to solve the above problems, researchers try to add inorganic nanomaterials such as inorganic nanoparticles, carbon nanotubes, graphene, molecular sieves and zeolites to the amine aqueous phase monomer solution or amide oil phase monomer solution for interfacial polymerization. , preparing polyamide-based nanofiltration membranes and reverse osmosis membranes by interfacial polymerization (J.Membr.Sci., 428(2013): 341-348; Polymer, 53(2012): 5295-5303; J.Membr.Sci., 423-424(2012):238-246), these polyamide membranes have a significant increase in water flux while maintaining the rejection rate, but the anti-fouling performance of the membrane has not been significantly improved
Moreover, due to the high surface energy and large specific surface area of ​​inorganic nanomaterials, agglomeration is prone to occur, which adversely affects the performance of the combined membrane, and because the interaction between the two phases of polyamide and inorganic nanomaterials is weak, the separation membrane will not be used for a long time. Inorganic nanoparticles added in the process are easy to lose, causing secondary pollution

Method used

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  • Preparation method of a novel polyamide composite separation membrane
  • Preparation method of a novel polyamide composite separation membrane
  • Preparation method of a novel polyamide composite separation membrane

Examples

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Effect test

Embodiment 1

[0028] By reversible addition-fragmentation chain transfer polymerization (RAFT), 10 g of 5-(2-methacryloyloxyethyldimethylamino) pentanecarboxylic acid inner salt was grafted on 100 g of silica nanoparticles with a diameter of 70 nm. On the particle surface, silica nanoparticles modified by poly 5-(2-methacryloyloxyethyl dimethylamino) pentanecarboxylic acid inner salt, poly 5-(2-methacryloyloxyethyl The number-average molecular weight of the internal salt of dimethylamino) pentanecarboxylic acid is 250,000 g / mol, and the poly-5-(2-methacryloyloxyethyldimethylamino) pentanecarboxylic acid and silica nanoparticles The mass ratio is 1:10; immerse the polyethersulfone ultrafiltration membrane in the oil phase trimesoyl chloride-n-hexane solution with a mass percentage concentration of 10%, take it out after 1 minute, and wipe off the excess organic phase solution on the surface of the membrane; then immerse In the water phase ethylenediamine aqueous solution, wherein the mass pe...

Embodiment 2

[0031]By reversible addition-fragmentation chain transfer (RAFT) polymerization, 10g of 3-(acryloyloxyethyldimethylamino) propanecarboxylic acid inner salt was grafted on the surface of 90g of titanium dioxide nanoparticles with a diameter of 100nm to prepare a polymer 3-(acryloyloxyethyl dimethylamino) propanecarboxylic acid inner salt modified titanium dioxide nanoparticles, the number average molecular weight of poly 3-(acryloyloxyethyl dimethylamino) propanecarboxylic acid inner salt is 150,000 g / mol, the mass ratio of poly 3-(acryloyloxyethyl dimethylamino) propanecarboxylic acid inner salt to titanium dioxide nanoparticles is 1:9; the polysulfone ultrafiltration membrane is immersed to a mass percentage concentration of 0.01 ﹪In the oil phase isophthaloyl chloride n-heptane solution, take it out after 10 minutes, wipe off the excess oil phase solution on the surface of the membrane; then immerse in the water phase m-phenylenediamine aqueous solution for 1 minute, wherein ...

Embodiment 3

[0034] By atom transfer radical polymerization (ATRP), 10g of 2-(2-methacryloyloxyethyl dimethylamino) ethanoic acid inner salt was grafted on the surface of 80g of calcium carbonate nanoparticles with a diameter of 200 nm to prepare Obtain poly 2-(2-methacryloyloxyethyl dimethylamino) ethyl carboxylate inner salt modified calcium carbonate nanoparticles, poly 2-(2-methacryloyloxyethyl dimethylamino) ) The number-average molecular weight of the inner salt of ethyl carboxylic acid is 400,000 g / mol, and the mass ratio of inner salt of 2-(2-methacryloyloxyethyl dimethylamino) ethyl carboxylic acid to calcium carbonate nanoparticles is 1 : 8; the polyacrylonitrile ultrafiltration membrane is immersed in the oil phase phthaloyl chloride cyclohexane solution of 4% by mass percent concentration, takes out after 5 minutes, takes out and removes the excess organic phase solution on the membrane surface; then immerses in water In the aqueous solution of adjacent phenylenediamine for 5 m...

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Abstract

The invention discloses a preparation method of a novel polyamide composite separation membrane. The method comprises the following steps: grafting zwitterions onto the surface of inorganic nanoparticles by active / controllable free-radical polymerization to obtain poly-zwitterion-modified inorganic nanoparticles; dissolving acyl chloride monomer in an organic solvent to prepare an oil-phase acyl chloride monomer solution; dispersing the poly-zwitterion-modified inorganic nanoparticles and amine monomer in water to prepare a water-phase amine monomer solution, and immersing a polymer ultrafiltration membrane in the oil-phase acyl chloride monomer solution for 1-10 minutes; immersing in the water-phase amine monomer solution for 1-10 minutes to obtain a nascent state separation membrane; and rinsing, and carrying out heat treatment for 0.5-10 hours to obtain the novel polyamide composite separation membrane. The method is simple and easy to implement, has the advantages of low production cost and obvious, stable and permanent modification effect, and has favorable industrialization application prospects.

Description

technical field [0001] The invention relates to the field of separation membrane separation, and relates to a preparation method of a novel polyamide composite separation membrane, in particular to a preparation method of a novel polyamide composite separation membrane containing polyzwitterion-modified inorganic nanoparticles in the separation layer. Background technique [0002] Water is the source of life. However, many countries and regions are now facing serious water shortages and serious pollution problems, especially the scarcity of fresh water resources, which seriously affects human production, life and development. Membrane separation technology has gradually developed into a key technology to solve water resource problems due to its outstanding advantages such as high separation efficiency, small footprint, simple process, low energy consumption (no phase change), and convenient operation, and has been highly valued by countries all over the world. . There are m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02B01D71/56B01D71/68B01D71/42B01D71/34
Inventor 朱丽静刘富薛立新
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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