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Preparation of surface crosslinked antimicrobial compound film

A composite membrane and cross-linking agent technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of antibacterial substance loss, membrane antibacterial performance decline, loss, etc., to achieve stable antibacterial composite layer, antibacterial Long-lasting effect and strong antibacterial effect

Inactive Publication Date: 2008-09-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common feature of the above technologies is that the antibacterial film is prepared by the method of bulk modification. Since the antibacterial effect is mainly on the surface of the film or the surface of the film hole, the disadvantage of the above method is that the utilization rate of a large number of antibacterial substances in the film body is not high; Moreover, in the process of use, the antibacterial substances will continue to be lost, resulting in the decline or even loss of the antibacterial performance of the film.
However, the polymer it uses is special and cannot be conventionally prepared; and the crosslinking reaction only occurs at the end of the polymer, resulting in a low degree of crosslinking. In practical applications, it is found that the antibacterial layer is unstable

Method used

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  • Preparation of surface crosslinked antimicrobial compound film
  • Preparation of surface crosslinked antimicrobial compound film

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Inject 2 ml of dimethylaminoethyl methacrylate (DMAEMA) and 0.002 g of azobisisobutyronitrile (AIBN) into the ampoule and mix evenly. Bubble nitrogen for 10 minutes to drive away oxygen, then seal and place at 45°C The polymerization reaction was carried out in a constant temperature shaking water bath for 48 hours. Dissolve the reaction product with ethanol, precipitate with petroleum ether to remove unreacted monomer, and dry to obtain the polymer. The flat polypropylene microporous membrane was immersed in a 10 g / L ethanol solution of polydimethylaminoethyl methacrylate obtained above, shaken at 30° C. for 6 hours, and then taken out to dry. Then the dried film was placed in a 10 g / L ethanol solution of p-dichlorobenzyl, and in-situ cross-linking and quaternization were carried out at 30° C. for 12 hours. Finally, ethanol and deionized water were used to wash off the unreacted p-dichlorobenzyl and uncrosslinked polymers on the surface of the membrane in sequence, an...

Embodiment 2

[0023] Inject 2 ml of 4-vinylpyridine (4-VP) and 0.001 g of azobisisobutyronitrile (AIBN) into the ampoule and mix evenly. Bubble nitrogen for 10 minutes to drive away oxygen, then seal and place at a constant temperature of 60°C Polymerization was carried out in a shaking water bath for 24 hours. Dissolve the reaction product with ethanol, precipitate with petroleum ether to remove unreacted monomer, and dry to obtain the polymer. The flat polypropylene microporous membrane was immersed in a 2 g / L ethanol solution of polydimethylaminoethyl methacrylate obtained above, shaken at 40° C. for 2 hours, and then taken out to dry. Then the dried film was placed in 2 g / L ethanol solution of p-dichlorobenzyl, and in-situ cross-linking and quaternization were carried out at 50°C for 24 hours. Finally, ethanol and deionized water were used to wash off the unreacted p-dichlorobenzyl and uncrosslinked polymers on the surface of the membrane in sequence, and the antibacterial composite me...

Embodiment 3

[0025] Inject 2 ml of dimethylaminoethyl methacrylate (DMAEMA) and 0.001 g of dibenzoyl peroxide (BPO) into the ampoule and mix well. Bubble nitrogen for 10 minutes to drive away oxygen, then seal and place at 75°C The polymerization reaction was carried out in a constant temperature shaking water bath for 24 hours. Dissolve the reaction product with ethanol, precipitate with petroleum ether to remove unreacted monomer, and dry to obtain the polymer. The polypropylene hollow fiber microporous membrane was immersed in a 5 g / L acetone solution of polydimethylaminoethyl methacrylate obtained above, shaken at 20° C. for 3 hours, and then taken out to dry. Then the dried film was placed in 20 g / L 1,3-dibromopropane ethanol solution, and in-situ cross-linking and quaternization were carried out at 30° C. for 6 hours. Finally, ethanol and deionized water were used to wash off the unreacted 1,3-dibromopropane and uncrosslinked polymer on the surface of the membrane in sequence, and t...

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Abstract

The invention discloses a method for preparing surface crosslinking polymeric quaternary ammonium salt antibacterial composite film, and the method comprises the following steps: firstly, polymeric monomer and initiator are mixed for carrying out bulk thermal polymerization, so as to prepare a polymer; secondly, a basal membrane such as a microporous polypropylene membrane, etc. is arranged in the obtained polymer solution to be soaked for a specific time, and then is taken out for airing, so as to enable the polymer to form a deposition layer on the membrane surface; thirdly, the polymer deposition layer on the surface of the basal membrane undergoes situ crosslinking, and is quaternized; fourthly, the unreacted crosslinking agent and the uncrosslinked polymer on the membrane surface are cleaned, and the antibacterial composite film can be obtained after drying. The method is economical and simple, and has universality; the prepared antibacterial composite film is stable and durable, and the antibacterial effect is obvious.

Description

technical field [0001] The invention relates to a preparation method of a separation membrane, in particular to a preparation method of an antibacterial composite membrane with a surface crosslinked polymer quaternary ammonium salt. Background technique [0002] Membrane separation technology is widely used in the field of water treatment. However, during use, bacteria are likely to multiply on the surface of the membrane and cause biofouling, resulting in a significant decrease in membrane flux, deterioration of separation performance, deterioration of effluent quality, and shortened membrane life. At present, the main methods to prevent membrane biofouling are: continuously inject chlorine gas into the water to be treated for sterilization, but at the same time it will pollute the water quality; remove microorganisms in the water through pre-filtration, which will make the process more cumbersome. Therefore, it is very important to prepare a separation membrane with its o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/60
Inventor 徐志康仰云峰万灵书
Owner ZHEJIANG UNIV
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