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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 the problems of microbial adsorption, bacterial growth pollution, membrane fouling, and difficulty in automation, etc., and achieve good anti-pollution performance , high water production flux, and improved surface hydrophilicity

Inactive Publication Date: 2021-11-05
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

[0036] Embodiment 1 (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 has been formed on the separation functional layer; the separation membrane of sample 1 has been obtained in this way; polymer 4 is a polymer represented by formula (2), and its counter ion is a chloride ion, and R1, R2 and R3 are all Methyl, the weight average molecular weight is 20000Da.

[0038]

Embodiment 2

[0039] Embodiment 2 (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.

Embodiment 3

[0041] Embodiment 3 (sample 4):

[0042] Compared with Example 2, the difference is that the concentration of polymer 4 in the aqueous solution was changed to 0.01% 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. The membrane sequentially comprises a porous mechanical support membrane, an ultrafiltration separation functional layer and a polymer layer from bottom to top. The preparation method of the ultrafiltration membrane comprises the following steps: S1, forming the porous support membrane; S2, preparing the polymer layer; and S3, carrying out drying and post-processing. Quaternary phosphonium salt is one of the latest research results in the field of antibacterial agent research, and experiments prove that the antibacterial effect of the quaternary phosphonium salt is nearly two orders of magnitude greater than the antibacterial effect of quaternary ammonium salt, so 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 hydrophilicity is improved, and the ultrafiltration membrane is thus good in anti-pollution performance and relatively high in water production flux; and in addition, positive charge P<+> ions of the quaternary phosphonium salt polymer layer can endow the ultrafiltration membrane with interception performance on ions, especially on positively charged ion 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
CPCB01D61/145B01D69/10B01D69/125B01D2325/48B01D2325/02B01D2325/24B01D2325/30B01D2325/22B01D2325/04B01D71/80B01D71/76B01D2325/38
Inventor 林小锋
Owner 苏州普希环保科技有限公司
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