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Hydrophilic modifying method for acrylonitrile/maleic acid copolymer separation film

A maleic acid copolymer and acrylonitrile technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of short-term maintenance of hydrophilicity, poor stability, easy loss, etc.

Inactive Publication Date: 2005-01-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical coating or adsorption method is the easiest to operate, but since the surface modifier is fixed on the membrane surface by physical adsorption, it is easy to lose, the stability is not good, and the hydrophilicity does not last long
Chemical methods such as plasma, glow discharge, corona discharge, high-energy radiation (γ-ray radiation, electron beam radiation), etc. may damage and affect the film surface, change the performance of the film body, and the treatment process is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 8 grams of acrylonitrile / maleic acid copolymer (molecular weight 158,000 g / mol, maleic acid molar content is 3.69%), dissolved in 92 grams of dimethyl sulfoxide, prepared into a flat porous membrane by aqueous precipitation . Take 4 pieces of 4×4cm 2 For flat membranes, wash the membranes in the order of water-ethanol-n-hexane, and dry them at room temperature. Put the membrane into a round bottom flask, add acetic anhydride to submerge the membrane, and reflux for 1 hour to dehydrate the carboxyl group into acid anhydride. After the reflux, after the temperature dropped to room temperature, the film was taken out, rinsed with acetone, and then dried in a vacuum oven at 40° C. for 3 hours to obtain a dry film. The dry film was placed in liquid polyethylene glycol-400, and reacted at 90±5°C for 16 hours under the protection of nitrogen. Then wash the membrane with a large amount of deionized water, put it into a vacuum oven, and dry it completely at 40°C to obtain a d...

Embodiment 2

[0022] 4 grams of acrylonitrile / maleic acid copolymer (molecular weight 158,000 g / mol, maleic acid molar content is 3.69%), dissolved in 96 grams of dimethyl sulfoxide, dried at 120 ° C to prepare a flat compact film . Take 4 pieces of 2×2cm 2 Flat dense membrane, wash the membrane in the order of water-ethanol-n-hexane, and dry it at room temperature. Put the membrane into a round bottom flask, add phosphorus oxychloride to immerse the membrane, and reflux for 1 hour to dehydrate the carboxyl group into an acid anhydride. After the reflux, after the temperature dropped to room temperature, the film was taken out, rinsed with acetone, and then dried in a vacuum oven at 40° C. for 3 hours to obtain a dry film. The dry film was placed in liquid polyethylene glycol-200, and reacted at 80±5°C for 16 hours under the protection of nitrogen. Then wash the membrane with a large amount of deionized water, put it into a vacuum oven, and dry it completely at 40°C to obtain a dry membr...

Embodiment 3

[0025] 12 grams of acrylonitrile / maleic acid copolymer (molecular weight: 190,000 g / mol, maleic acid molar content: 7.5%) was dissolved in 88 grams of dimethyl sulfoxide to prepare a hollow fiber membrane. Take 8 acrylonitrile / maleic acid copolymer hollow fiber membranes with a length of 5 cm, wash the membranes in the order of water-ethanol-n-hexane, and dry them at room temperature. Put the membrane into a round bottom flask, add acetic anhydride to submerge the membrane, and reflux for 1 hour to dehydrate the carboxyl group into acid anhydride. After the reflux, after the temperature dropped to room temperature, the film was taken out, rinsed with acetone, and then dried in a vacuum oven at 40° C. for 3 hours to obtain a dry film. Heat polyethylene glycol-600 to 80°C, put it into a dry film after it becomes liquid, and react at 100±5°C for 24 hours under the protection of nitrogen. Then wash the membrane with a large amount of deionized water, place it in a vacuum oven, an...

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Abstract

The invention is a hydrophile modification method for acrylonitrile / maleic acid polymer separation film. The method eliminates water molecular to two adjoined carboxy on the film surface by the dehydrating agent and forms anhydride, using the reaction ability of the anhydride and the carboxy, the hydrophile high molecular polyethylene glycol is grafted to the surface of the film. After the graft, the hydrophile performance can be upgraded greatly, and it can be maintained muchly. For example, the contact angle of the membrane surface is decreased; it can be decreased from 48 degrees to 21 degrees, the macrophage conglutination can be decreased to 88%.

Description

technical field [0001] The invention relates to a technology for surface modification of a polymer film, in particular to the hydrophilization modification of the film surface by grafting hydrophilic polymers through chemical reactions. Background technique [0002] In recent years, membrane separation technology is gradually replacing the traditional separation process because it can be operated under normal pressure, normal temperature or low temperature, without phase change, and integrates separation, concentration and purification. Preparation of pure water, separation, concentration and purification of biological products such as proteins, enzymes, vaccines, drugs and genes, especially artificial liver, artificial lung and artificial kidney, which are increasingly important in biomedicine for replacing damaged organs or improving their functions It has been widely used in artificial organs. Polyacrylonitrile membrane is a kind of excellent separation membrane. It has ...

Claims

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Application Information

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IPC IPC(8): B01D71/78
Inventor 徐志康聂富强黄小军万灵书王建琴
Owner ZHEJIANG UNIV
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