Anti-pollution polyamide composite membrane and preparation method thereof

An anti-pollution, polyamide technology, applied in the field of water treatment, can solve problems such as affecting the membrane surface potential and hydrophilicity, decreasing the separation performance of the composite membrane, reducing the mechanical properties of the membrane, etc., achieving good microbial resistance and anti-pollution performance, Microbial resistance and anti-pollution performance, long service life effect

Inactive Publication Date: 2015-03-25
HUNAN OVAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyamide membrane prepared by the grafting method not only has the disadvantages of low grafting rate, affecting the surface potential and hydrophilicity of the membrane, resulting in a decrease in the separation performance of the composite membrane, and complicated processes, but also destroys the membrane structure and reduces the mechanical properties of the membrane.

Method used

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  • Anti-pollution polyamide composite membrane and preparation method thereof
  • Anti-pollution polyamide composite membrane and preparation method thereof
  • Anti-pollution polyamide composite membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] An anti-pollution polyamide composite membrane, comprising a non-woven fabric layer, a polysulfone support layer, a polyamide layer and an anti-pollution layer arranged in sequence, the anti-pollution layer contains a broad-spectrum antibacterial agent containing a hydroxyalkyl group, a hydrophilic A cross-linked polymer obtained by carrying out a cross-linking reaction between a permanent polymer and a cross-linking agent in the presence of water and a catalyst, wherein the cross-linking reaction refers to two or more molecules (usually linear molecules) bonded to each other and cross-linked The relatively stable molecules (body-shaped molecules) forming a network structure react; the thickness of the polyamide layer is 50-300nm, and the thickness of the anti-pollution layer is 20-200nm.

[0042] The broad-spectrum antibacterial agent that contains hydroxyalkyl group selects 5-amino-1-hydroxyethylpyrazole for use, and its content is 0.1% (the content of broad-spectrum a...

Embodiment 2

[0057] A kind of antipollution polyamide composite membrane, differs from embodiment 1 in that:

[0058] The broad-spectrum antibacterial agent containing hydroxyalkyl is selected from 4,5-diamino-1-(2-hydroxyethyl)pyrazole.

[0059] Table 1 shows the results obtained by testing the above polyamide composite membrane.

[0060] The structural formula of the cross-linked polymer obtained by cross-linking the above-mentioned broad-spectrum antibacterial agent, hydrophilic polymer and cross-linking agent is as follows:

[0061]

[0062] Where m+n=1, m>0, n>0.

[0063] The surface of the anti-pollution polyamide composite membrane of the present invention (Example 2) is thicker and smoother than the surface of the traditional polyamide composite membrane (comparative example), and is more scratch-resistant and pollution-resistant.

[0064] Conventional polyamide composite membrane (comparative example) and gained polyamide composite membrane of the present invention (embodimen...

Embodiment 3

[0066] An anti-pollution polyamide composite membrane, which differs from Example 1 in that: 1,3-dimethylol-5,5-dimethylhydantoin is selected as the broad-spectrum antibacterial agent containing hydroxyalkyl groups.

[0067] Table 1 shows the results obtained by testing the above polyamide composite membrane. The structural formula of the cross-linked polymer obtained by cross-linking the above-mentioned broad-spectrum antibacterial agent, hydrophilic polymer and cross-linking agent is as follows:

[0068]

[0069] Where m+n=1, m>0, n>0.

[0070] The surface of the anti-pollution polyamide composite membrane of the present invention (Example 3) is thicker and smoother than the surface of the traditional polyamide composite membrane (comparative example), and is more scratch-resistant and pollution-resistant.

[0071] Conventional polyamide composite membrane (comparative example) and gained polyamide composite membrane of the present invention (embodiment 3) use the attenu...

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Abstract

The invention firstly aims at providing an anti-pollution polyamide composite membrane, comprising a nonwoven fabric layer, a polysulfone support layer, a polyamide layer and an anti-pollution layer which are sequentially arranged, wherein the anti-pollution layer comprises an antibacterial hydrophilic crosslinked polymer which is obtained by crosslinking reaction of a broad-spectrum antibacterial agent containing hydroxyalkyl, a hydrophilic polymer and a crosslinking agent. The anti-pollution polyamide composite membrane provided by the invention has a simplified overall structure, has good microbial resistance and antifouling property due to the design of the anti-pollution layer, and has relatively high water flux and salt rejection capability and long service life. The invention secondly aims at providing a preparation method of the anti-pollution polyamide composite membrane. The preparation method comprises the following steps: preparing an anti-pollution solution; preparing a base body comprising the nonwoven fabric layer, the polysulfone support layer and the polyamide layer; and forming the anti-pollution layer. The preparation method is simple in preparation process and short in production cycle; the obtained anti-pollution polyamide composite membrane has good microbial resistance and antifouling property; and relatively high water flux and salt rejection capability and long service life are kept.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an anti-pollution polyamide composite membrane and a preparation method thereof. Background technique [0002] The aromatic polyamide composite membrane is a polyamide separation layer formed by interfacial polymerization on the non-woven fabric and polysulfone support layer (such as US5160619, CN1261818A, etc.), which has high desalination rate, large flux, excellent chemical stability, pH value With the advantages of wide range (4-11) and low operating pressure requirements, it has become the most widely used reverse osmosis composite membrane variety. However, due to the poor hydrophilicity of the aromatic polyamide membrane and the rough surface of the membrane, it is extremely susceptible to organic, inorganic and microbial contamination. Membrane fouling is still a key issue affecting the application of polyamide composite membranes, and seriously hinders the develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D67/00
Inventor 彭博路宏伟胡群辉喻慧贺攀王进刘旦王纯清刘鹏君
Owner HUNAN OVAY TECH CO LTD
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