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Method for modifying polyvinylidene fluoride microporous film to be protein contamination resistant

A polyvinylidene fluoride, microporous membrane technology, applied in the direction of fiber type, textile and paper making, fiber processing, etc. Fluorinated vinyl microporous membrane and other problems, to achieve the effect of good surface modification, strong anti-protein pollution, high mechanical strength

Active Publication Date: 2012-06-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent published by Harbin Institute of Technology (application number: 20081037184.0) adopts the method of soaking in strong alkali solution and nano oxide sol to modify the surface of polyvinylidene fluoride microporous membrane, which solves the problem of the stability of the modified membrane, but Strong alkali will destroy the mechanical strength of polyvinylidene fluoride membrane and seriously affect the service life of polyvinylidene fluoride membrane, which restricts the application of anti-protein pollution polyvinylidene fluoride microporous membrane

Method used

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  • Method for modifying polyvinylidene fluoride microporous film to be protein contamination resistant
  • Method for modifying polyvinylidene fluoride microporous film to be protein contamination resistant
  • Method for modifying polyvinylidene fluoride microporous film to be protein contamination resistant

Examples

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Effect test

Embodiment 1

[0021] Put the polyvinylidene fluoride flat microporous membrane into the reaction kettle after methanol pretreatment, and under the protection of nitrogen, mix hydroxyethyl methacrylate: copper fluoride / cuprous fluoride: pentamethyldialkylenetriamine : Distilled water with a weight ratio of 600: 1.5 / 1.5: 2: 1000 was added to the reaction kettle, reacted at 40° C. for 1 hour at a constant temperature, and the film was taken out, washed successively with distilled water, and vacuum-dried. These membranes are then placed in a sodium ion mixture containing sodium ammonium nitrate, nitric acid, methylenebisacrylamide, 3-(methacrylamide)propyl-dimethyl(3-sulfopropyl)amine and distilled water, wherein the mass percentages of sodium ammonium nitrate and nitric acid are 0.1% and 4% respectively, the mass percentage of methylenebisacrylamide is 0.1%, 3-(methacrylamide) propyl-dimethyl (3- The mass percent of sulfopropyl) amine is 1%. React at 40° C. for 1 hour under the protection of ...

Embodiment 2

[0023]Put the polyvinylidene fluoride roll-type microporous membrane into the reactor after methanol pretreatment, under the protection of nitrogen, mix hydroxypropyl methacrylate: cupric chloride / cuprous chloride: bipyridine: distilled water according to the weight ratio of The solution of 700:1 / 1:1.5:1000 was added into the reaction kettle, and the reaction was carried out at a constant temperature of 50°C for 10 hours. The membrane was taken out, washed successively with distilled water, and dried in vacuum. These membranes are then placed in a mixed solution of cerium ions, which contains ammonium cerium nitrate, nitric acid, vinylbisacrylamide, 3-[N,N-dimethyl-[2-(2-methylpropane-2 -alkenoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and distilled water, wherein the mass percentages of ceric ammonium nitrate and nitric acid are 5% and 2% respectively, and the mass percentage of vinylbisacrylamide is 2% , The mass percent of 3-[N,N-dimethyl-[2-(2-methylprop-2-eno...

Embodiment 3

[0025] Put the polyvinylidene fluoride hollow fiber microporous membrane into the reactor after pretreatment with methanol, under the protection of nitrogen, adjust the weight ratio of hydroxybutyl methacrylate: copper bromide / cuprous bromide: ethylenediamine: distilled water The ratio of 800:0.5 / 0.5:1:1000 was added to the reaction kettle, and the temperature was kept at 60°C for 6 hours. The membrane was taken out, washed with distilled water in sequence, and dried in vacuum. These films are put into sodium ion mixed solution again, there are sodium ammonium phosphate, phosphoric acid, carbodiimide, dodecyl ethoxy betaine and distilled water in this solution, wherein the mass percent of sodium ammonium phosphate and phosphoric acid are respectively 3% and 0.1%, the mass percentage of carbodiimide is 1%, and the mass percentage of dodecyl ethoxy betaine is 8%. React at 60° C. for 3 hours under the protection of nitrogen, take out the membrane, wash it with phosphate buffer so...

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Abstract

The invention relates to a method for modifying a polyvinylidene fluoride microporous film to be protein contamination resistant, which forms a zwitter ion copolymer layer on polyvinylidene fluoride surface through two-stage polymerization grafting method. The method specifically comprises allowing atom free radical polymerization of olefine acid hydroxyl ester compounds on the surface of a polyvinylidene fluoride microporous film, placing the film in a mixed solution containing zwitter ions, and allowing alkali metal ion-induced copolymerization, so as to obtain the polyvinylidene fluoride microporous film with protein contamination resistance. The modified polyvinylidene fluoride microporous film obtained by the method of the invention has enhanced hydrophilicity and strength, and the flux recovery rate after protein solution filtration is over 97%.

Description

technical field [0001] The invention relates to a method for modifying polyvinylidene fluoride microporous membranes against protein pollution. The method of the present invention is a two-step polymerization and grafting method, using zwitterions as modified materials to obtain high hydrophilicity (contact angle<30°), high strength (elongation ratio>100%), and good resistance to protein pollution The method of polyvinylidene fluoride microporous membrane with high performance (flux recovery rate > 97%). Background technique [0002] Membrane technology is widely used in chemical, food, biochemical and other fields due to its advantages of energy saving, cleanliness and easy operation. However, fouling of the membrane surface can cause flux attenuation, which in turn leads to higher costs and lower product quality. The adsorption of protein on the membrane surface usually occurs in the initial stage of membrane fouling, once it occurs, it will cause the adsorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/42C08J9/40C08J7/16C08J7/12C08L27/16D06M14/10D06M13/463D06M101/22
Inventor 李倩王晓琳田野林亚凯周波毕秋艳
Owner TSINGHUA UNIV
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