Composite nanometer filtering film and its preparation method

A composite nanofiltration membrane and base membrane technology, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of mechanical strength and hydrophobicity decrease, functional coating easy to peel off, membrane function deterioration, etc. Achieve the effects of easy industrial implementation, low cost, and improved anti-pollution performance

Inactive Publication Date: 2006-07-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it only has a single positive charge, and due to hydrophilic swelling, the mechanical strength and hydrophobicity will decrease; Rondman et al. disclose the use of block copolymer PDMAEMA-PFOMA as the surface material and use the hydrophobicity of PFOMA to prepare anti-pollution composite nanofiltration membranes technology (see "Surface Energy of Homemade and Commercial Nanofiltration Membranes: Effects of Wetting and Natural Organics Contamination" [J] J. Membranescience, 2000, 175: 61-73); the disadvantage of this technology is that the functional coating The thicker layer (about 1 μm) is easier to peel off, which will lead to the deterioration of the function and quality of the film

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  • Composite nanometer filtering film and its preparation method
  • Composite nanometer filtering film and its preparation method

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preparation example Construction

[0021] The method used in the preparation of the copolymer in the preparation method of the present invention is bulk polymerization; the method used in the preparation of the nanofiltration membrane is an interfacial polymerization composite method. The preparation method of the present invention is to coat the coating solution of the copolymer ethanol water on the surface of the base film, and after drying in the shade at room temperature, immerse in the organic phase of the bifunctional alkylation crosslinking agent reacted with the tertiary amino group, and make The linear copolymer chains adsorbed on the surface of the base membrane are cross-linked into a water-insoluble three-dimensional network layer, thereby preparing the nanofiltration membrane with the functional characteristics.

[0022] The composite nanofiltration membrane of the present invention adopts P (DMAEMA-co-AA) cross-linking monomer as the functional layer material, wherein the content of AA is different...

Embodiment 1

[0027] 1. Preparation of P(DMAEMA-co-AA): Distill DMAEMA under reduced pressure to remove the polymerization inhibitor, then mix it with AA, the mixing ratio is x:y=90:10, add 0.005M AIBN, and proceed at 50°C Bulk polymerization, the polymerization time is 5 days;

[0028] 2. Prepare the copolymer coating solution: dissolve the copolymer prepared in the first step with a mixed solution with a ratio of ethanol: water=10:90 to make the copolymer coating solution;

[0029] 3. Prepare the composite nanofiltration membrane in which the copolymer is the functional layer material: evenly coat the copolymer coating liquid prepared in the second step on the surface of the polysulfone base membrane, and after drying in the air, put it into Soak in the pure n-heptane solution containing the cross-linking agent p-dichlorobenzyl for 1 hour, take out the base film after the cross-linking is completed, wash off the unreacted cross-linking agent with lip-reading n-heptane, and make the organi...

Embodiment 2

[0032] 1. Preparation of P(DMAEMA-co-AA): Distill DMAEMA under reduced pressure to remove the polymerization inhibitor, then mix it with AA, the mixing ratio is x:y=8:1, add 0.001M AIBN, and proceed at 70°C Bulk polymerization, the polymerization time is 9 days;

[0033] 2. Prepare the copolymer coating solution: dissolve the copolymer prepared in the first step with a mixed solution with a ratio of ethanol: water=50:50 to make the copolymer coating solution;

[0034] 3. Prepare the composite nanofiltration membrane in which the copolymer is the functional layer material: evenly coat the copolymer coating liquid prepared in the second step on the surface of the polysulfone base membrane, and after drying in the air, put it into Soak in the n-heptane solution containing the cross-linking agent 1,4-dibromobutane for 6 hours, take out the base film after the cross-linking is completed, wash off the unreacted cross-linking agent with n-heptane, and use it in the air After the org...

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Abstract

The invention relates the complex nano filter film and preparing method. The basementmembrane of complex nano filter film is ultrafiltration flat film, which is polysulfone or polyvinylidene fluoride, or hollow fiber film. The functional material of complex nano filter film is the copolymer of methacrylic acid dimethylamino carbethoxy- acroleic acid. The method comprises the following steps: 1 preparing the copolymer of methacrylic acid dimethylamino carbethoxy- acroleic acid; 2 preparing coating liquid; 3 making the copolymer and basementmembrane crosslinking by interfacial polymerization reaction, using the copolymer as functional material, preparing complex nano filter film. The complex nano filter film possesses positive charge and negative charge, strong water repellency, good dirt resistance and long lifetime. The method is simple, low cost and easy to carry out.

Description

technical field [0001] The invention relates to a composite nanofiltration membrane and a preparation method thereof, in particular to a copolymer (P(DMAEMA-co-AA) made of a polymer material dimethylaminoethyl methacrylate (DMAEMA) and acrylic acid (AA). ) is a composite nanofiltration membrane of functional layer material and its preparation method, and the international patent classification number is proposed to be Int.Cl 7 B01D 69 / 12. Background technique [0002] Nanofiltration membrane technology is a new membrane technology between ultrafiltration and reverse osmosis membrane technology. Its technical feature is to achieve selective permeation of dissolved components through steric hindrance and electrostatic interaction, and the operating pressure of the system is much lower than that of the reverse osmosis process (operating pressure is usually 0.4-1MPa). The rejection rate of the nanofiltration membrane to divalent ions and solutes with a molecular weight greate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12
Inventor 王薇杜启云张宇峰李国东
Owner TIANJIN POLYTECHNIC UNIV
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