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Method used for improving performance of polyimide film via grafting with zwitter ions and silver, and product thereof

A technology of polyimide membrane and amphoteric ion, which is applied in the field of polyimide membrane modification, can solve the problems of easy adsorption and reproduction of bacteria, and is not an anti-pollution method, so as to facilitate industrial application, improve anti-biological pollution, and easy The effect of the operation

Active Publication Date: 2017-03-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above method has the problem that bacteria are easy to adsorb and reproduce, and it is not a fundamentally effective anti-pollution method.

Method used

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  • Method used for improving performance of polyimide film via grafting with zwitter ions and silver, and product thereof
  • Method used for improving performance of polyimide film via grafting with zwitter ions and silver, and product thereof
  • Method used for improving performance of polyimide film via grafting with zwitter ions and silver, and product thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The method for improving polyimide membrane anti-pollution performance in the present embodiment comprises the following steps:

[0056] S1 Add the silver ion solution to the solution containing amine groups and disperse evenly for 60 minutes. The silver ion solution is silver nitrate. The concentration of silver ions in the silver nitrate solution is 0.005mol / L. The concentration of ethyleneimine solution is 0.3mol / L.

[0057] S2 will be modeled as A 4000T polyimide membrane (the raw material manufacturer is Solvay Advanced Polymers) was immersed in the solution in S1 for 60 minutes. The polyimide membrane was a polyimide microfiltration membrane with a pore size of 0.01 μm to 1 m. The film-forming liquid concentration of the polyimide film was 16%. After soaking, remove and rinse with plenty of water.

[0058] S3 adds a reducing agent dropwise to the solution of S2, and keeps it for 120 minutes, then takes it out and washes it, and the reducing agent is sodium bor...

Embodiment 2

[0064] The method for improving polyimide membrane anti-pollution performance in the present embodiment comprises the following steps:

[0065] S1 Add the silver ion solution to the solution containing amine groups and disperse evenly for 70 minutes. The silver ion solution is silver nitrate. The concentration of silver ions in the silver nitrate solution is 0.001mol / L. The concentration of ethyleneimine solution is 0.3mol / L.

[0066] S2 will be modeled as A 4000T polyimide membrane (the raw material manufacturer is Solvay Advanced Polymers) was immersed in the solution in S1 for 70 minutes. The polyimide membrane was a polyimide microfiltration membrane with a pore size of 0.01 μm to 1 μm. The film-forming liquid concentration of the polyimide film was 16%. After soaking, remove and rinse with plenty of water.

[0067] S3 adds a reducing agent dropwise to the solution of S2 for 100 minutes, then removes and washes the solution. The reducing agent is sodium borohydride.

...

Embodiment 3

[0073] The method for improving polyimide membrane anti-pollution performance in the present embodiment comprises the following steps:

[0074] S1 Add the silver ion solution to the solution containing amine groups and disperse evenly for 10 minutes. The silver ion solution is silver nitrate, the concentration of silver ions in the silver nitrate solution is 0.01mol / L, and the solution containing amine groups is a solution containing polyethyleneimine , the concentration of polyethyleneimine is 0.1mol / L

[0075] S2 will be modeled as A 4000T polyimide membrane (the raw material manufacturer is Solvay Advanced Polymers) was immersed in the solution in S1 for 10 minutes. The polyimide membrane was a polyimide ultrafiltration membrane with a pore size of 0.001 μm to 0.1 μm. The film-forming liquid concentration of the polyimide film was 12%. After soaking, remove and rinse with plenty of water.

[0076] S3 added a reducing agent dropwise to the solution of S2, kept for 420 mi...

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Abstract

The invention belongs to the field of polyimide film modification, and more specifically discloses a method used for improving performance of polyimide film via grafting with zwitter ions and silver. The method comprises following steps: firstly, a silver ion solution is uniformly dispersed into an amino-containing solution; polyimide film is immersed in an obtained mixed solution, a reducing agent is added into the mixed solution dropwise, and the polyimide film is taken out from the mixed solution and is washed; after washing, the polyimide film is immersed in an organic solvent 1, and then is taken out from the organic solvent for drying; after drying, the polyimide film is subjected to irradiation under ultraviolet light, is immersed into an organic solvent 2, and is fixed with filter paper and immersed in a zwitter ion solution; and at last, the polyimide film in the zwitter ion solution is subjected to irradiation under ultraviolet light, and then is taken out from the zwitter ion solution, so that the surface of the polyimide film is grafted with silver nanoparticles and the zwitter ions, and the stain resistance of the obtained polyimide film is improved. The invention also discloses the polyimide film obtained via modification. The modified polyimide film is capable of inhibiting growth of bacteria, and possesses stable and reliable stain resistance; the method is simple; and industrialized application is convenient to realize.

Description

technical field [0001] The invention belongs to the field of modification of polyimide membranes, more specifically, relates to a method and product for improving the performance of polyimide membranes by grafting zwitterions and silver, and the polyimide treated by the method can inhibit bacterial growth , Stably and reliably improve its ability to resist biological pollution. Background technique [0002] Membrane fouling is a key issue that affects and restricts the rapid development and wide application of membrane technology. It will reduce membrane flux, reduce membrane permeation quality, shorten membrane life, and increase membrane use costs. Membrane fouling is mainly caused by the physical and chemical interaction between the membrane surface and the inorganic substances, organic substances, colloids, microorganisms, etc. in the processed feed liquid. Membrane fouling is inevitable, but it can be reduced by various methods. [0003] Polyimide membrane has excelle...

Claims

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Application Information

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IPC IPC(8): C08J7/18C08J7/12C08L79/08
CPCC08J7/12C08J7/18C08J2379/08
Inventor 刘洁王艳张栋艳史玉升诸钧
Owner HUAZHONG UNIV OF SCI & TECH
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