Method for preparing antibacterial composite membrane, antibacterial composite membrane prepared from method and application thereof to field of water treatment

A composite membrane and heat treatment technology, applied in the field of separation membranes, can solve the problems of reducing silver ion release efficiency, shortening antibacterial life, reducing sterilization efficiency, etc.

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former reduces the release efficiency of silver ions, thereby reducing the bactericidal efficiency of the membrane; the latter is easy to lose the silver nanoparticles on the surface of the membrane, shortening the antibacterial life of the membrane

Method used

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  • Method for preparing antibacterial composite membrane, antibacterial composite membrane prepared from method and application thereof to field of water treatment
  • Method for preparing antibacterial composite membrane, antibacterial composite membrane prepared from method and application thereof to field of water treatment

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preparation example Construction

[0023] The invention provides a kind of preparation method of antibacterial composite membrane, and this method comprises the following steps:

[0024] (1) Mixing a polymer containing multiple hydroxyl groups, a silane coupling agent containing a mercapto group, an acid, an aldehyde, and a solvent to prepare a coating solution;

[0025] (2) coating the coating solution on a nanofiltration membrane or a reverse osmosis membrane to carry out a thermal crosslinking reaction to obtain a composite membrane with a crosslinked layer on the surface;

[0026] (3) the cross-linked layer of the composite membrane is contacted with an aqueous solution of silver nitrate;

[0027] (4) heat-treating the composite film obtained after step (3).

[0028] According to one embodiment of the present invention, in step (1), the polymer containing polyhydric hydroxyl can be one of polyvinyl alcohol, glucose, chitosan, sodium alginate and chitosan quaternary ammonium salt or more; preferably, the p...

Embodiment approach

[0042] According to one embodiment of the present invention, in the process of dissolving the polymer containing polyhydric hydroxyl group, aldehyde and silane coupling agent containing mercapto group in the solvent, it is preferably carried out under the condition of stirring. The conditions and stirring equipment are not specifically limited, and can be carried out under appropriate stirring conditions with conventional stirring equipment well known to those skilled in the art, as long as the polymers containing polyhydric hydroxyl groups, aldehydes, and silane coupling agents containing mercapto groups can be It can be fully dissolved in the solvent. In addition, in the present invention, the process of dissolving the polyhydric hydroxyl-containing polymer, aldehyde, and mercapto-containing silane coupling agent in a solvent may be carried out at normal temperature.

[0043] In a word, the present invention prepares the coating liquid by dissolving the polymer containing po...

Embodiment 1

[0062] This embodiment is used to illustrate the antibacterial composite film provided by the present invention and its preparation method.

[0063] (1) Preparation of PVA coating solution: Dissolve 1.0g of PVA in 100g of deionized water, heat to 90°C, stir until it is completely dissolved, then add 0.1g of formaldehyde and 0.4g of formaldehyde to the cooled above solution γ-mercaptopropyltrimethoxysilane, and then dropwise dropwise dilute hydrochloric acid under stirring conditions to adjust the pH of the solution to 1;

[0064] (2) Thermal crosslinking reaction: contact the surface of NF90 with polyamide dense layer polymerized on the surface with the PVA coating solution obtained above for 30s by coating, remove excess solution, and then put it in an oven at 100°C for crosslinking After 6min, a composite film with a cross-linked PVA structure on the surface was obtained;

[0065] (3) The composite film is coated with one side of PVA layer and 2% by weight of AgNO 3 The aq...

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Abstract

The invention relates to the technical field of separating membranes and discloses a method for preparing an antibacterial composite membrane, the antibacterial composite membrane prepared from the method and application thereof to field of water treatment. The method for preparing the antibacterial composite membrane comprises a step (1) of mixing macromolecules containing multiple hydroxyl groups, a silane coupling agent containing sulfhydryl groups, acid, aldehyde and solvent, and preparing a coating liquid; a step (2) of coating a nanofiltration membrane or a reverse osmosis membrane with the coating liquid to perform thermo-crosslinking reaction, and obtaining a composite membrane with the surface provided with a crosslinking layer; a step (3) of contacting the crosslinking layer of the composite membrane with an aqueous solution of silver nitrate; and a step (4) of performing heating treatment on the composite membrane obtained through the step (3). The method for preparing the antibacterial composite membrane has the advantages that (1) the method is simple, expanded production is performed easily; (2) in-situ reduction is performed, and gathering of nano-silver is prevented; (3) nano-silver particles can be fixed to a macromolecule layer through interaction of sulfhydryl groups, and the loss of nano-silver in the membrane operation process is avoided.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a method for preparing an antibacterial composite membrane, an antibacterial composite membrane prepared by the method, and an application of the antibacterial composite membrane in the field of water treatment. Background technique [0002] Nanofiltration and reverse osmosis are currently the most widely used water treatment technologies that rely on pressure to achieve separation. The pore size range of the nanofiltration membrane is about a few nanometers, and the removal of monovalent ions and organic compounds with a molecular weight of less than 200 is poor, while the removal of divalent or multivalent ions and organic compounds with a molecular weight between 200-500 is relatively high. The removal rate can be widely used in water softening, drinking water purification, water quality improvement, oil-water separation, wastewater treatment and reuse, seawater s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D69/02C02F1/44
Inventor 张杨刘轶群潘国元严昊徐健郭敏
Owner CHINA PETROLEUM & CHEM CORP
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