Pollution-resistant polyamide composite membrane and preparation method thereof

A pollution-resistant, polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of weak anti-microbial pollution, weak anti-inorganic and organic pollution, etc., and achieve high salt cut-off rate , easy to prepare and operate, high water flux effect

Inactive Publication Date: 2014-01-01
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing anti-fouling membrane technology is mainly divided into two aspects: one is to apply hydrophilic polymers to the surface of the polyamide composite membrane to enhance the anti-pollution performance of the composite membrane, for example: CN101462024A is sequentially coated on the surface of the polyamide layer The PVA solution and the solution containing the cross-linking agent and catalyst are then cross-linked at high temperature to form a highly cross-linked PVA anti-pollution layer, which improves the strength of the PVA anti-pollution layer, thereby improving the water erosion resistance and solubility of the composite film, and improving the Its anti-inorganic and organic pollution ability, but weak anti-microbial pollution
The second is to add antimicrobial nanoparticles into the polyamide layer to form an antimicrobial pollution composite membrane, for example: as CN101874989A, a composite membrane prepared by a new interfacial polymerization method forms a complete and uniform polyamide membrane on the surface of the polysulfone support layer At the same time, a layer of polyamide film modified by inorganic antimicrobial particles is formed on the surface, which improves the performance of the polyamide composite film against microbial contamination and prolongs the service life of the composite film. However, its resistance to inorganic substances and Poor ability to pollute organic matter

Method used

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  • Pollution-resistant polyamide composite membrane and preparation method thereof
  • Pollution-resistant polyamide composite membrane and preparation method thereof
  • Pollution-resistant polyamide composite membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Prepare the pollution-resistant polyamide composite membrane 1 of this embodiment according to the following steps:

[0036] 1) Preparation of inorganic nanoparticle composite hydrophilic polymer solution: Weigh 3g of PVA with a degree of polymerization of 1400 and a degree of alcoholysis of 99%, 10g of glutaraldehyde, 20g of hydrochloric acid in 966g of pure water, and heat to 95℃ , Stir until completely dissolved; Weigh 1g of nano silver particles with a particle size of 20nm and add them to the solution and stir until they are evenly mixed.

[0037] 2) Preparation of anti-pollution layer: form a polysulfone layer on the polysulfone support layer; then combine the polysulfone support layer formed with the polysulfone layer and the inorganic nanoparticles obtained in step 1) of this embodiment to compound hydrophilicity The polymer solution was contacted for 10 seconds to remove the excess solution, and a PVA layer containing nanoparticles was formed on the surface of the p...

Embodiment 2

[0040] Prepare the pollution-resistant polyamide composite membrane 2 of this embodiment according to the following steps:

[0041] 1) Preparation of inorganic nanoparticle composite hydrophilic polymer solution: Weigh 5g of PVA with a degree of polymerization of 900 and a degree of alcoholysis of 99%, 10g of glutaraldehyde, and 20g of hydrochloric acid in 964g of pure water and heat to 95℃ , Stir until completely dissolved; Weigh 1g of nano silver particles with a particle size of 20nm and add them to the solution and stir until they are evenly mixed.

[0042] 2) Preparation of anti-pollution layer: Preparation of anti-pollution layer: form a polysulfone layer on the polysulfone support layer; then combine the polysulfone support layer formed with the polysulfone layer with the inorganic material obtained in step 1) of this embodiment The nanoparticle composite hydrophilic polymer solution was contacted for 10s, the excess solution was removed, and a PVA layer containing nanoparti...

Embodiment 3

[0045] Prepare the pollution-resistant polyamide composite membrane 3 of this embodiment according to the following steps:

[0046] 1) Preparation of inorganic nanoparticle composite hydrophilic polymer solution: Weigh 10g of PVA with a degree of polymerization of 2400 and a degree of alcoholysis of 99%, 10g of glutaraldehyde, and 20g of hydrochloric acid in 959g of pure water, and heat to 95℃ , Stir until completely dissolved; Weigh 1g of nano silver oxide particles with a particle size of 20nm and add them to the solution and stir until they are evenly mixed.

[0047] 2) Preparation of anti-pollution layer: form a polysulfone layer on the polysulfone support layer; then combine the polysulfone support layer formed with the polysulfone layer and the inorganic nanoparticles obtained in step 1) of this embodiment to composite hydrophilic polymerization The material solution was contacted for 10s, the excess solution was removed, and a PVA layer containing nanoparticles was formed on...

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Abstract

The invention discloses a pollution-resistant polyamide composite membrane which comprises a nonwoven fabric layer, a porous support layer, a polyamide layer and a pollution-resistant layer which are stacked sequentially, wherein the pollution-resistant layer comprises a polymer compounding inorganic nano particles; the inorganic nano particles are modified or unmodified inorganic nano particles, and preferably are at least one kind of the nano particles of silver, silver compound, modified silver, modified silver compound, copper, copper compound, modified copper, modified copper compound, zinc, zinc compound, modified zinc, modified zinc compound, titanium, titanium compound, modified titanium and modified titanium compound. The invention also provides a preparation method of the pollution-resistant polyamide composite membrane and an application of the pollution-resistant polyamide composite membrane in the field of liquid separation.

Description

Technical field [0001] The invention relates to the field of liquid separation, in particular to a pollution-resistant polyamide composite membrane and a preparation method thereof. Background technique [0002] Polyamide composite membrane is the most widely used liquid separation membrane variety. Its structure is a non-woven fabric, polysulfone support layer, and a polysulfone support layer formed by interfacial polymerization of polyamide separation layer (for example, US patent US5160619 and China Patent CN1724130A, etc.). Polyamide composite membrane has the advantages of high salt rejection, high flux, excellent chemical stability, wide pH range (4-11), and low operating pressure requirements. However, the problem of membrane fouling is still a key issue affecting the application of polyamide composite membranes and severely hinders the further promotion of composite membranes. In practical applications, membrane materials are prone to pollution including organic polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/02B01D67/00
Inventor 邹昊彭博刘旦姜莹胡群辉路宏伟
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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