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Quaternary phosphonium salt antibacterial ultrafiltration membrane and preparation method thereof

A technology of ultrafiltration membranes and quaternary phosphonium salts, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve problems such as microbial adsorption, bacterial growth contamination, difficulty in automation, and degradation of membrane performance, and achieve water flux High, improved surface hydrophilicity, good anti-pollution performance

Inactive Publication Date: 2021-01-05
苏州普希环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Different from the filtration membrane separation technology, the membrane separation technology only provides the necessary operating pressure for the supply of raw water, and only needs to run for a long time before flushing the filter membrane, and there are no other processes. In this case, it is easy to manipulate the membrane device to make it Automation, unmanned management, but it is not easy to automate routine processing
The ultrafiltration membrane developed now uses organic polymer materials, such as quaternary ammonium salt antibacterial agents, which have been widely used and can greatly improve the filtration efficiency, but a large number of microorganisms are easy to adsorb on the surface of the membrane. , growth, and reproduction cause bacterial pollution, and bacteria and fungi have gradually produced a certain degree of drug resistance, and the residue after use has certain toxicity, which causes membrane fouling and reduces the performance of the membrane.
Therefore, the present invention provides a quaternary phosphonium salt antibacterial ultrafiltration membrane and a preparation method thereof to solve the problems of poor antibacterial effect of water treatment membranes, easy fouling and low water production flux, improve the antibacterial effect of water treatment membranes, and enhance ultrafiltration. Membrane service life

Method used

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  • Quaternary phosphonium salt antibacterial ultrafiltration membrane and preparation method thereof
  • Quaternary phosphonium salt antibacterial ultrafiltration membrane and preparation method thereof
  • Quaternary phosphonium salt antibacterial ultrafiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1 (sample 1 comparative example):

[0035]Mix PEG20000 containing 16wt% polysulfone membrane material with a mass concentration of 2.0wt% and organic solvent N,N-dimethylacetamide (DMAc), heat to 80°C and stir for 24 hours, cool to 25°C and let stand Degassing for 8 hours to obtain casting solution A; scrape coating casting solution A on a polyester non-woven mechanical support, and use 35°C pure water as a coagulation bath to prepare a flat ultrafiltration membrane separation by phase inversion method Functional layer 30.

Embodiment 2

[0036] Embodiment 2 (sample 2):

[0037] The surface of the separation function layer of sample 1 was immersed in an aqueous solution containing 0.5% by weight of polymer 4 for 5 minutes; then, the separation function layer was air-dried for 30 seconds, and further kept in a hot air drier at 120° C. for 2 minutes, thereby A polymer layer was formed on the separation functional layer; in this way, the separation membrane of Sample 1 was obtained; Polymer 4 was a polymer represented by formula (2).

[0038]

Embodiment 3

[0039] Embodiment 3 (sample 3):

[0040] Compared with Example 2, the difference is that the concentration of polymer 4 in the aqueous solution was changed to 0.03% by weight, and a separation membrane was obtained by the same method as sample 1.

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Abstract

The invention provides a quaternary phosphonium salt antibacterial ultrafiltration membrane which sequentially comprises a porous mechanical support membrane, an ultrafiltration separation functionallayer and a polymer layer from bottom to top, and further provides a preparation method of the ultrafiltration membrane, which comprises the following steps of: S1, forming a porous support membrane;S2, preparing a polymer layer; and S3, carrying out drying and post-treatment. Quaternary phosphonium salt is one of the latest research achievements in the research field of antibacterial agents, andexperiments prove that the antibacterial effect of quaternary phosphonium salt is nearly two orders of magnitudes of the antibacterial effect of quaternary ammonium salt, so that the antibacterial performance of the ultrafiltration membrane can be greatly improved; secondly, a separation contact layer of the ultrafiltration membrane is formed by coating a traditional hydrophobic material with a hydrophilic quaternary phosphonium salt antibacterial polymer, so that the hydrophilicity is improved, the anti-pollution performance is good, and the water production flux is relatively high; and in addition, the positive charge P+ ions of the quaternary phosphonium salt polymer layer can endow the ultrafiltration membrane with ion retention, especially for positively charged ionic substances.

Description

technical field [0001] The invention relates to the technical field of sewage treatment membranes, in particular to a quaternary phosphonium salt antibacterial ultrafiltration membrane and a preparation method thereof. Background technique [0002] In the field of filter membrane technology for sewage treatment, membrane water treatment is a solid-liquid separation technology. It uses membrane pores to filter water and retain impurities in water. Using such a membrane can mainly remove colloids and plankton, etc. Insoluble iron and manganese are removed, and fungi can be removed. However, in order to prevent bacteria from being regenerated in the clear water pool, the sterilization process cannot be omitted. The raw water directly connected to the plate-frame and spiral membranes should remove the floating substances in the raw water before flowing into the membrane in order to prevent the membrane pores from being blocked. [0003] Different from the filtration membrane s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D69/10B01D67/00B01D71/76B01D71/80
CPCB01D61/145B01D69/10B01D69/125B01D71/76B01D71/80B01D2325/02B01D2325/04B01D2325/22B01D2325/24B01D2325/30B01D2325/38B01D2325/48
Inventor 林小锋
Owner 苏州普希环保科技有限公司
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