Method for improving antifouling property of polyimide film and product

A polyimide membrane, anti-pollution technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of decreased anti-pollution ability, hydrophilic damage, easy oxidation of bonds, etc., to achieve easy operation, The effect of high hydrophilicity and simple preparation process

Active Publication Date: 2016-07-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydration bond of polyethylene glycol is easily oxidized, cracked, the hydrophilicity is destroyed, and the anti-pollution ability is reduced

Method used

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  • Method for improving antifouling property of polyimide film and product
  • Method for improving antifouling property of polyimide film and product
  • Method for improving antifouling property of polyimide film and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method for improving polyimide membrane anti-pollution performance in the present embodiment comprises the following steps:

[0029] S1: Change the model to Immerse the polyimide film in the diamine-containing solution for 30min, then take it out and wash it, and remove the unreacted diamine solution. The diamine solution is N,N-diethylethylenediamine with a concentration of 0.5wt %. The polyimide membrane is 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, take it out and rinse it with clean water.

[0030] S2 Immerse the polyimide membrane washed in step S1 in a 0.2wt% 1,3-propane sultone solution for 24 hours at a temperature of 50° C., then take it out and wash it to obtain a modified membrane.

Embodiment 2

[0032] The method for improving polyimide membrane anti-pollution performance in the present embodiment comprises the following steps:

[0033] S1: Change the model to The polyimide membrane is immersed in the diamine solution for 60min, and then the unreacted diamine solution is taken out and washed. The diamine solution is N,N-diethylethylenediamine, and the concentration of the diamine solution is 0.5wt%. . The polyimide membrane is 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 clean water.

[0034] S2 Immerse the polyimide membrane washed in step S1 in a 0.2wt% 1,3-propane sultone solution for 24 hours at a temperature of 50° C., then take it out and wash it.

Embodiment 3

[0036] The method for improving polyimide membrane anti-pollution performance in the present embodiment comprises the following steps:

[0037] S1: Change the model to The polyimide film is immersed in the diamine solution for 240min, and then the unreacted diamine solution is taken out and washed. The diamine solution is N,N-diethylethylenediamine, and the concentration of the diamine solution is 0.5wt%. . The polyimide membrane is 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 clean water.

[0038] S2 Immerse the polyimide membrane washed in step S1 in 0.2wt% 1,3-propane sultone solution for 24 hours at a temperature of 50° C., then take it out and wash it.

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Abstract

The invention discloses a method for improving the antifouling property of a polyimide film and a product, belonging to the field of modification of polyimide films. The method comprises the following steps: immersing the polyimide film in a diamine solution for 0.1h-24h, taking the film out and cleaning the film; and immersing the cleaned polyimide film in an acid solution for 1-48h, taking the film out and cleaning the film. According to the method, by use of good hydrophilicity of zwitter-ions, the zwitter-ions are successfully grafted on the surface of the polyimide film to endow the polyimide film with high hydrophilic performance, obviously improve the hydrophilicity of the film and further improve the antifouling property of the film, and the microorganism adsorption and biological membrane formation inhibition are reduced, and the antifouling ability is stably and reliably improved. The preparation process is simple, can be operated easily and can realize industrial application.

Description

technical field [0001] The invention belongs to the modification field of polyimide membranes, and more specifically relates to a method and a product for improving the anti-pollution performance of polyimide membranes. Background technique [0002] Water shortage is a common problem faced by the whole world. Membrane-based water treatment process is a treatment technology with good application prospects, which has the advantages of high efficiency, reliability, environmental friendliness and low energy consumption. [0003] In the process of water treatment, membrane fouling is a key issue that affects and restricts the rapid development, high efficiency and wide application of membrane technology. Membrane fouling is caused by the accumulation and adsorption of inorganic substances, organic substances, microorganisms or their mixture intercepted by the membrane on the surface of the membrane or inside the pores, which usually results in reduced membrane flux, poor permeat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D67/00
CPCB01D67/0088B01D71/64B01D2325/30
Inventor 史玉升王艳张栋艳刘洁诸钧
Owner HUAZHONG UNIV OF SCI & TECH
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