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Dopamine-based modified polymer film and preparation method thereof

A polymer membrane, dopamine technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve problems such as the degradation of the original membrane performance, and achieve the effects of simple operation, good effect and wide application.

Inactive Publication Date: 2017-09-12
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of dopamine modified polymer film and its preparation method, the polymer film-forming material is modified by the dopamine adhesion layer formed on the polymer powder, and then the film is formed by the phase inversion method to prepare Membrane with stable structure and uniform performance, which overcomes the defect of lower performance of original membrane caused by dopamine post-coating method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Dissolve 0.1815g of Tris in 300mL of distilled water, and adjust the pH to 8.5 with hydrochloric acid to obtain a Tris-HCl buffer solution;

[0025] (2) Dissolve 0.3 g of dopamine hydrochloride in the solution obtained in step (1) under magnetic stirring at room temperature, and quickly add 6.0 g of PVDF powder and 10 mL of ethanol or isopropanol or glycerol;

[0026] (3) magnetically stirring the mixed solution obtained in step (2) at 25° C. for 6 h;

[0027] (4) Suction filter the product obtained in step (3), then wash with deionized water-centrifuge for 3 times, then place the product in a vacuum desiccator at 40°C and dry to constant weight, namely dopamine-modified PVDF powder;

[0028] (5) Weigh 15 to 35 parts of the polymer powder obtained in step (4), 2 to 5 parts of PVP, and 60 to 83 parts of DMF according to the mass fraction, mix them, and stir at 50 to 70°C for 2 to 6 hours to form a uniform cast film After vacuum defoaming for 0.5-1.5 hours, pour the ...

Embodiment 2

[0030] (1) with embodiment 1;

[0031] (2) with embodiment 1;

[0032] (3) with embodiment 1;

[0033] (4) with embodiment 1;

[0034] (5) Weigh 15-35 parts of the polymer powder obtained in step (4), 2-5 parts of PEG, and 60-83 parts of DMF according to the mass fraction, mix them, and stir at 50-70°C for 2-6 hours to form a uniform cast film After vacuum defoaming for 0.5-1.5 hours, pour the film-casting solution onto a dry and clean glass plate, scrape the film with a scraper, and place it in a pure water coagulation bath to obtain the dopamine-modified polymer film.

Embodiment 3

[0036] (1) with embodiment 1;

[0037] (2) with embodiment 1;

[0038] (3) with embodiment 1;

[0039] (4) with embodiment 1;

[0040] (5) Weigh 15-35 parts of the polymer powder obtained in step (4), 2-5 parts of F127, and 60-83 parts of DMF according to the mass fraction, mix them, and stir at 50-70°C for 2-6 hours to form a uniform casting film After vacuum defoaming for 0.5-1.5 hours, pour the film-casting solution onto a dry and clean glass plate, scrape the film with a scraper, and place it in a pure water coagulation bath to obtain the dopamine-modified polymer film.

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Abstract

The present invention discloses a dopamine-based modified polymer film and a preparation method thereof, and belongs to the field of environmental materials. The dopamine-modified polymer film preparation method comprises: (1) self-polymerizing dopamine on the surface of polymer powder, and adhering the generated poly dopamine function layer onto the surface of the polymer powder; and (2) preparing the film from the dopamine-modified polymer powder by using a solution phase conversion film forming method. According to the present invention, the film forming material is modified with dopamine and then the film is formed, such that the film structure can be controlled flexibly and conveniently according to the use need; the prepared film has good hydrophilicity and good pollution resistance, and can be further subjected to functionalized modification; the modification does not damage the film material, and does not sacrifice the physical and chemical properties of the original film; the method has advantages of simple process, good effect, energy saving and environmental protection; and the prepared film has good hydrophilicity and good pollution resistance, and is suitable for various film separation fields.

Description

technical field [0001] The invention relates to a dopamine-modified polymer film and a preparation method thereof, in particular to modifying a polymer film-forming material with dopamine (PDA), and then preparing a film, which belongs to the field of environmental materials. Background technique [0002] Membrane separation can be operated under mild conditions without phase transition, and is one of the important technologies in the chemical industry. The core of membrane separation is the membrane, and the structure and physicochemical properties of the membrane material are crucial to the separation performance. Commonly used membrane materials are polyvinylidene fluoride, polysulfone, polyethersulfone, polyacrylonitrile, etc. These materials have excellent anti-ultraviolet and aging resistance, and good chemical stability. They are not corroded by acids and alkalis at room temperature, and they also have good thermal stability and mechanical strength. They are excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/68B01D69/06B01D69/08B01D69/04B01D67/00B01D71/42
CPCB01D67/0011B01D69/04B01D69/06B01D69/08B01D71/34B01D71/42B01D71/68B01D2323/12B01D2323/18
Inventor 陈熙董华琳马胜奎赵博武李坤王泽亚陈莉
Owner TIANJIN POLYTECHNIC UNIV
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