Method for improving hydrophilicity of polymer porous membrane by dentritic branching molecule

A polymer and porous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high driving force of mass transfer through membrane, rapid decline of membrane flux, and shortened membrane life. To achieve the effect of easy processing into film, simple film making method and low viscosity

Inactive Publication Date: 2006-07-12
ZHEJIANG UNIV
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Problems solved by technology

Therefore, there are two problems: one is the high driving force of mass transfer through the membrane; the other is that it is easy to adsorb organic matter, protein, etc. to cause membrane fouling, resulting in a rapid decline in membrane flux an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] Preparation of Dendritic Branched Molecules

[0032] (1) Preparation of dendritic poly(amide-amine) macromolecules with amino-terminated groups: poly(amide-amine) dendrimers with amino-terminated poly(amide-amine) dendrimers are made of ethylenediamine and methyl acrylate, through Micheal addition, The alternating reaction of aminolysis was synthesized by stepwise method. The synthesis method is as follows: add 200ml of methanol and 200ml of ethylenediamine into a 500ml reaction vessel, stir at room temperature, fill with nitrogen for half an hour, then add 125ml of methyl acrylate dropwise to the above mixture, and stop the reaction after 24 hours. The excess methyl acrylate and methanol were distilled off under reduced pressure to obtain the 0.5 generation dendrimer. Weigh 16.32g of the half-generation dendrimers obtained above and add them to the reaction vessel, add 200ml of methanol and 550ml of ethylenediamine and stir for 4 days under ice-water bath conditions, ...

Embodiment 1

[0040] Preparation of polyvinylidene fluoride and hyperbranched poly(amine-ester) blend membrane

[0041] Dissolve 14g of polyvinylidene fluoride (PVDF, Shanghai 3F, FR904) and 10g of HBAE-5 synthesized by the above quasi-one-step method in 76g of N,N,-dimethylacetamide, heat and stir in a water bath at 70°C for 60h , to obtain a uniform and transparent casting solution. Cast the casting solution onto a clean glass plate or stainless steel plate support carrier, scrape the casting solution into a liquid film with a uniform thickness with a scraper with a blade depth of 150 μm, and then immerse the glass or stainless steel carrier with the liquid film in the In water, the liquid film undergoes phase inversion to obtain a solid film. After taking out the membrane, soak it in deionized water at 80°C for 2 days, then soak it in 80% ethanol aqueous solution at 20°C for 1 day, and finally take the membrane out of the ethanol aqueous solution, and let it dry naturally in the air. O...

Embodiment 2

[0048] Preparation of Polyvinylidene Fluoride (PVDF) Porous Membrane

[0049] Dissolve 14g of PVDF in 86g of N,N,-dimethylacetamide, then heat and stir in a water bath at 70°C for 60 hours to obtain a uniform and transparent casting solution. Cast the casting solution onto a clean glass plate or stainless steel plate support carrier, scrape the casting solution into a liquid film with a uniform thickness with a scraper with a blade depth of 150 μm, and then immerse the glass or stainless steel carrier with the liquid film in the In water, the liquid film undergoes phase inversion to obtain a solid film. After taking out the membrane, soak it in deionized water at 60°C for 3 days, then soak it in 90% ethanol aqueous solution at 30°C for 1.5 days, and finally take the membrane out of the ethanol aqueous solution and let it dry naturally in the air. A PVDF porous membrane is obtained. The membrane structure and performance testing methods are the same as in Example 1, and the r...

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Abstract

The invention discloses a method for using tree branching molecule to improve the hydrophilicity of polymer porous membrane. The method comprises following steps: (1) adding the tree branching molecule and polymer into solvent to be heated, mixed and dissolved; (2) laying casting liquid on the carrier of stainless steel plate or glass plate and using erasing knife to make it into a liquid film with a certain thickness; (3) dipping the carrier with casting liquid into coagulating bath via the lyotropic conversion process to make the liquid film into tree branching molecule to improve the property of polymer porous membrane. The invention can adjust the molecular weight, terminal group and added amount of tree branching molecule to control the surface property of polymer porous membrane; and adjust the components of casting liquid and coagulating bath and temperature to control the structure of porous membrane. The inventive method can effectively control the balance between hydrophilicity and dewatering of dewatering polymer; improve the dirt resistance and biocompatibility, which can improve the preparation and application of ultra and micro filtration film.

Description

technical field [0001] The invention relates to the technical field of polymer porous membrane preparation and hydrophilization modification, in particular to a method for improving the hydrophilicity of polymer porous membranes by dendritic branched molecules. Background technique [0002] In the past 20 years, endomembrane separation technology has been developed rapidly, and has been widely used in various fields such as food industry, pharmaceutical industry, sanitation and environmental protection. Membrane is the starting point and core of membrane separation technology, and it is also the direction and focus of membrane separation technology research and development. However, with the broadening of the application range of membrane separation technology and the in-depth study of membrane material modification, new problems about the main membrane material - polymer membrane - also arise. Especially for the ultrafiltration and microfiltration membrane process when dea...

Claims

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Application Information

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IPC IPC(8): B01D67/00
Inventor 朱宝库魏秀珍徐又一
Owner ZHEJIANG UNIV
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