Preparation of affinity polysulfone-chitosan compound asymmetrical ultrafiltration film
A technology of chitosan and ultrafiltration membranes, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve problems such as complex activation methods, single active groups, and no consideration of the internal structure of the membrane, and achieve Ideal pore structure, simple preparation method, and good mechanical strength
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Embodiment 1
[0012] 1. Preparation of Chloromethylated Polysulfone Asymmetric Membrane
[0013] Put chloromethylated polysulfone and polyethylene glycol in dimethylformamide, the ratio of chloromethylated polysulfone / polyethylene glycol is 4 / 1, the molecular weight of polyethylene glycol is 600, 80-85℃ Stirring was continued for 12 hours. Then put the casting solution in a dark place and let it stand for 24 hours. Pour the film-casting liquid onto a glass plate, the temperature of the glass plate is 50°C, scrape with a scraper to form a film, evaporate for 30 seconds, immerse in distilled water, and solidify for 1 hour. The solidified membrane was taken out and washed with flowing water for 24 hours to obtain a chloromethylated polysulfone asymmetric membrane with through holes at the bottom.
[0014] 2. Preparation of Hydroxymethyl Polysulfone Membrane
[0015] Take the chloromethylated polysulfone membrane prepared in step 1, place it in 15% soda ash solution, and vibrate at a constan...
Embodiment 2
[0019] Take chloromethylated polysulfone and ethylene glycol monomethyl ether and put them in N-methylpyrrolidone, the ratio of chloromethylated polysulfone / ethylene glycol monomethyl ether is 4 / 1, and stir at 80-85°C for 15 hours. Then put the casting solution in a dark place and let it stand for 24 hours. Pour the film-casting solution on a glass plate, the temperature of the glass plate is 70°C, use a scraper to form a film, evaporate for 1 minute, immerse in 10% propionic acid solution, and solidify for 1 hour. The coagulated film was taken out and washed with running water for 24 hours. The asymmetric membrane of chloromethylated polysulfone was obtained.
[0020] A hydroxymethylpolysulfone membrane and a polysulfone-chitosan composite membrane were prepared according to the scheme of Example 1.
Embodiment 3
[0022] Dissolve 80 mg of sodium borohydride in 12 ml of 2M NaOH, add 20 ml of water and 4 ml of dioxirane. The hydroxymethylpolysulfone membrane prepared in Example 1 was placed in the above solution, activated by shaking at room temperature for 4 hours, and then washed 3 times with distilled water. The activated membrane was placed in 2% chitosan acetic acid solution, the concentration of acetic acid was 10% (volume), shaken at 40°C for 5 hours, and then dried in an oven at 120°C for 4 hours. The dried membrane was washed with 1% acetic acid solution for 1 hour and a large amount of distilled water for 1 day to obtain a polysulfone-chitosan composite membrane.
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