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
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[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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