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PGMA copolymer microsphere-polyethyleneimine coating modified polymer film and preparation method thereof

A polyethyleneimine, polymer membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as inability to achieve surface morphology, uncontrollable microsphere process, and non-uniformity of microspheres. , to achieve the effect of excellent hydrophilicity and anti-pollution performance

Active Publication Date: 2022-04-12
佛山市南海区苏科大环境研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this system, the microspheres formed on the surface are not uniform, and the process of forming microspheres is uncontrollable, so the controllable construction of the surface morphology cannot be realized.

Method used

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  • PGMA copolymer microsphere-polyethyleneimine coating modified polymer film and preparation method thereof
  • PGMA copolymer microsphere-polyethyleneimine coating modified polymer film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for PGMA copolymerized microspheres-polyethyleneimine coating modified PVDF film, comprising the following steps:

[0027] (1) Put 7.5g of PVP K-30 into a three-necked flask equipped with a stirring device, add 15g of absolute ethanol and 2.5g of GMA, under stirring conditions, pass argon for 30 minutes until the solid is completely dissolved, then add 2.5g of GMA and 0.025g AIBN; Stir the reaction in an oil bath at 70°C under argon atmosphere for 6h, add 22.9uL DVB under argon atmosphere, continue to react under argon atmosphere for 18h, then terminate the reaction, centrifuge the reaction solution, and use 95% ethanol Disperse, continue to precipitate, disperse and wash for 3 times, and finally the product is dispersed in deionized water for later use; the particle size of the obtained PGMA-containing microspheres is about 350nm; the obtained PGMA copolymerized microsphere dispersion is further diluted with deionized water and dispersed to a concentration of 3...

Embodiment 2

[0031] A method for PGMA copolymerized microspheres-polyethyleneimine coating modified PVDF film, comprising the following steps:

[0032] (1) Adopt the PGMA copolymerization microsphere preparation method in step 1 in the embodiment 1 to prepare PGMA copolymerization microspheres, adjust DVB add-on to be 7.6uL; PGMA copolymerization microsphere particle diameter 1650nm; Gained PGMA copolymerization microsphere dispersion liquid continues to add Dilute and disperse with ionic water to form a PGMA copolymerized microsphere aqueous dispersion with a mass percent concentration of 3% (wt%);

[0033] (2) Dissolving polyethyleneimine (with a weight average molecular weight of 25000 g / mol) in deionized water to prepare an aqueous solution of polyethyleneimine with a mass percent concentration of 5% (wt%);

[0034] (3) 3% (wt%) PGMA copolymerized microsphere aqueous dispersion and polyethyleneimine aqueous solution alternately sprayed (utilizing a spray gun or other spray equipment) i...

Embodiment 3

[0036] A method for PGMA copolymerized microspheres-polyethyleneimine coating modified PVDF film, comprising the following steps:

[0037] (1) Add 0.5g of glycidyl methacrylate (GMA), 1.975g of styrene (St), 0.025g of divinylbenzene (DVB), and 40g of deionized water into a three-necked flask. / min and stir for 30 minutes until completely dissolved; put it into a 70°C oil bath under the condition of argon; dissolve 0.075g of potassium persulfate in 7.5g of deionized water, and add the above solution under the condition of argon. The reaction system was stirred continuously for 24 hours to terminate the reaction; the reaction liquid was centrifuged and precipitated, dispersed with 95% ethanol, and the precipitate was dispersed and washed for 3 times, and the final product was dispersed in deionized water for later use; the particle diameter of the obtained PGMA copolymerized microspheres was 100 nm; the obtained PGMA copolymerized microspheres The dispersion liquid continues to ...

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Abstract

The invention provides a method for modifying a polymer film through a PGMA copolymer microsphere-polyethyleneimine coating. The method comprises the following steps: preparing PGMA copolymer microspheres, and dispersing the PGMA copolymer microspheres in deionized water to prepare a PGMA copolymer microsphere aqueous dispersion; preparing a polyethyleneimine aqueous solution; the preparation method comprises the following steps: alternately spraying a PGMA copolymer microsphere aqueous dispersion and a polyethyleneimine aqueous solution on the surface of a polymer film, heating the sprayed polymer film in a drying oven, taking out the film, and washing the film with deionized water to obtain a PGMA copolymer microsphere-polyethyleneimine coating modified polymer film; the polymer membrane is a polyvinylidene fluoride membrane, a nylon membrane, a polysulfone membrane, a polyethersulfone membrane and a polyacrylonitrile membrane. The invention also provides the PGMA copolymer microsphere-polyethyleneimine coating modified polymer film. The invention further provides the PGMA copolymer microsphere-polyethyleneimine coating modified polymer film. The modified microspheres in the coating modified polymer film are uniform, the preparation process is simple and controllable, and construction of the surface morphology of the modified film is facilitated.

Description

technical field [0001] The invention belongs to the field of chemically modified membranes, in particular to a method for modifying polymer membranes with PGMA copolymerized microspheres-polyethyleneimine coating. Background technique [0002] Membrane separation technology is an emerging efficient, fast and energy-saving water and wastewater treatment technology, which has many advantages and is very practical. However, conventional commercial polymer membranes are prepared from hydrophobic materials such as polyvinylidene fluoride, which have the characteristics of low surface energy and strong hydrophobicity, so membrane fouling is easy to occur, resulting in rapid fouling of commercial membranes , the membrane flux decays rapidly, and further excessive frequent cleaning not only increases the cost but also shortens the membrane life, which ultimately limits the large-scale application of membrane separation technology. It is generally believed that improving the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02
Inventor 张干伟纪海兰刘大朋周晓吉郭永福方秋月吴志娟陈庐停枫
Owner 佛山市南海区苏科大环境研究院
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