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Preparation method of high-efficiency compound antibacterial separation membrane

A composite antibacterial and separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, can solve the problems of cumbersome preparation methods, decreased antibacterial properties, easy to be eluted, etc., and achieves novel preparation methods. The effect of preventing leakage and easy operation

Inactive Publication Date: 2011-01-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the antibacterial film prepared by the bulk blending method, its antibacterial components are easily embedded in the film body, the utilization efficiency is not high, and it is easy to be lost during use, resulting in a decline in antibacterial performance
Although the antibacterial layer deposited on the surface has a high utilization rate, the binding strength between the antibacterial layer and the membrane body is not enough, it is easy to be eluted, and the preparation method is cumbersome.

Method used

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  • Preparation method of high-efficiency compound antibacterial separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 7.5g polyacrylonitrile (number average molecular weight is 5kg / mol), 7.5g additive (PAN-g-PDMAEMA, wherein the molar content of PDMAEMA is 5%) is dissolved in DMF, under 50 ℃, constantly stirs to prepare the weight percent A homogeneous solution with a concentration of 30%, remove the air bubbles after standing for several hours, use the solution as a casting solution, scrape it on a glass plate, take it out after immersing in water for 30 minutes, and then use the immersion precipitation phase inversion method to prepare polypropylene Nitrile separation membrane.

[0027] The above-mentioned polyacrylonitrile separation membrane was immersed in water at room temperature for 1 hour, and then placed in water at 90° C. for annealing treatment for 1 hour to obtain an annealed polyacrylonitrile separation membrane.

[0028] Put the above annealed polyacrylonitrile separation membrane into 0.005mol / L silver nitrate aqueous solution and soak for 12 hours, then take it out qui...

Embodiment 2

[0031] 6.25g polyacrylonitrile (Mn is 150kg / mol), 1.25g additive (PAN-g-PDMAEMA, wherein the molar content of PDMAEMA is 50%) is dissolved in NMP, under 50 ℃, constantly stirring is formulated into the weight percent concentration of 15% homogeneous solution, remove air bubbles after standing for several hours, use this solution as casting solution, scrape it on a glass plate, take it out after immersing in water for 30 minutes, that is, prepare polyacrylonitrile separation by immersion precipitation phase inversion method membrane.

[0032] The above polyacrylonitrile separation membrane was put into a 20°C deionized water bath, soaked for 12 hours, and then the water bath was heated to 90°C for annealing treatment for 6 hours to obtain an annealed polyacrylonitrile separation membrane.

[0033] Put the above-mentioned annealed polyacrylonitrile separation membrane into 0.01mol / L silver nitrate aqueous solution and soak for 6 hours, then take it out quickly and put it into 0....

Embodiment 3

[0036] Dissolve 0.25g polyacrylonitrile (Mn is 1000kg / mol), 0.25g additive (PAN-g-PDMAEMA, wherein PDMAEMA molar content is 50%) in DMSO, stir constantly at 50 ℃ and prepare the weight percent concentration of 5% homogeneous solution, remove air bubbles after standing for several hours, use this solution as casting solution, scrape it on a glass plate, take it out after immersing in water for 30 minutes, that is, prepare polyacrylonitrile separation by immersion precipitation phase inversion method membrane.

[0037] The above polyacrylonitrile separation membrane was placed in a deionized water bath at 15°C, soaked for 24 hours, and then the water bath was heated to 90°C for annealing treatment for 12 hours to obtain an annealed polyacrylonitrile separation membrane.

[0038] Put the annealed polyacrylonitrile separation membrane into 0.02mol / L silver nitrate aqueous solution and soak for 0.5 hours, then take it out quickly and put it into 0.4mol / L NaBH 4 After soaking in th...

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Abstract

The invention discloses a preparation method of a high-efficiency compound antibacterial separation membrane, comprising the following steps: (1) preparing a membrane forming polymer and additive into membrane casting liquid, and adopting an immersion precipitation phase conversion method to prepare a polymer separation membrane; (2) carrying out annealing treatment on the polymer separation membrane; (3) successively dipping the annealing treatment polymer separation membrane into silver nitrate aqueous solution and sodium borohydride aqueous solution to obtain a polymer separation membrane the surface of which adsorbs silver nano particles; (4) dipping the polymer separation membrane the surface of which adsorbs the silver nano particles into crosslinker solution; carrying out quaternization and in situ crosslinking reaction; and drying to obtain the compound antibacterial separation membrane. The method is easy and simple to realize, and the prepared compound antibacterial separation membrane is stable and durable and has high antibacterial efficiency and obvious antibacterial effect.

Description

technical field [0001] The invention relates to the field of preparation of separation membranes, in particular to a preparation method of a high-efficiency composite antibacterial separation membrane in which silver nanoparticles are generated in situ on the surface and a quaternary ammonium salt crosslinked layer is formed. Background technique [0002] Polymer separation membranes have been widely used in seawater desalination, food separation, purification of biological agents, hemodialysis and other fields. However, in the process of use, the bacteria in the separation feed liquid are easy to adhere to the surface of the membrane and further multiply to block the membrane pores, resulting in poor separation performance of the membrane, a sharp decrease in the membrane flux, and a shortened service life of the membrane, especially When polymeric separation membranes are used for hemodialysis, bacterial contamination can endanger the health of patients. Therefore, it is ...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D71/68B01D71/34B01D69/12B01D67/00
Inventor 徐志康王芳万灵书
Owner ZHEJIANG UNIV
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