Preparation method of ethylene/vinyl alcohol copolymer membrane for blood purification
A vinyl alcohol copolymer film and vinyl alcohol copolymer technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of poor solubility and poor anti-biological pollution of the membrane, and achieve good film formation and low production cost Low, good solubility effect
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Embodiment 1
[0069] The first step: preparation of amphiphilic zwitterionic polymer:
[0070] (1) Synthesis of NCO-sulfopropyl betaine
[0071] 27 parts of isophorone diisocyanate (27 g), 12 parts of 3-(dimethylamino)-1-propylamine, and 17 parts of 1,3-propane sultone were reacted at 20° C. for 48 h, and the precipitate was dried.
[0072] (2) NCO-sulfopropyl betaine grafted ethylene / vinyl alcohol copolymer
[0073] Dissolve 50 parts of ethylene / vinyl alcohol copolymer, 20 parts of NCO-sulfopropyl betaine, and 0.4 parts of dibutyltin dilaurate in 350 parts of dimethyl sulfoxide, react at 50°C for 8 hours, and then remove the solution Precipitate in deionized water, wash and dry.
[0074] The second step: preparation of casting solution: 52 parts of ethylene / vinyl alcohol copolymer, 20 parts of ethylene / vinyl alcohol copolymer grafted NCO sultaine, and 328 parts of dimethyl sulfoxide were placed in the reaction vessel, and Stir for 10 hours at a temperature of 80°C, and stand for 12 hour...
Embodiment 2
[0079] The first step: preparation of amphiphilic zwitterionic polymer:
[0080] (1) Synthesis of NCO-carboxypropyl betaine
[0081] React 30 parts of dicyclohexylmethane diisocyanate (30g), 20 parts of 3-(dimethylamino)-1-propylamine, and 25 parts of 1,3-propane sultone at 90°C for 0.5h, and dry the precipitate .
[0082] (2) NCO-carboxypropyl betaine grafted ethylene / vinyl alcohol copolymer
[0083] Dissolve 18 parts of ethylene / vinyl alcohol copolymer, 14 parts of NCO-sulfopropyl betaine, and 0.003 parts of dibutyltin dilaurate in 608 parts of N,N-dimethylacetamide, and react at 20°C for 24 hours. The solution was precipitated in deionized water, washed and dried.
[0084] The second step: preparation of casting solution: put 58 parts of ethylene / vinyl alcohol copolymer, 36 parts of ethylene / vinyl alcohol copolymer grafted NCO carboxybetaine, 72 parts of 1,3-propylene glycol and 195 parts of sulfolane into the reaction vessel , stirred at a temperature of 180°C for 0.5h...
Embodiment 3
[0088] The first step: preparation of amphiphilic zwitterionic polymer:
[0089] (1) Synthesis of NCO-sulfopropyl betaine
[0090] 2 parts of dicyclohexylmethane diisocyanate (2 g), 2 parts of 3-(dimethylamino)-1-propylamine, and 2 parts of 1,3-propane sultone were reacted at 50° C. for 12 h, and the precipitate was dried.
[0091] (2) NCO-sulfopropyl betaine grafted ethylene / vinyl alcohol copolymer
[0092] Dissolve 2 parts of ethylene / vinyl alcohol copolymer, 2 parts of NCO-sulfopropyl betaine, and 0.04 parts of triethylamine in 9.3 parts of N-methylpyrrolidone, react at 100°C for 0.5h, and then dissolve the solution in acetone Precipitation, washing and drying.
[0093] The second step: the preparation of casting solution: put 6 parts of ethylene / vinyl alcohol copolymer, 2 parts of ethylene / vinyl alcohol copolymer grafted NCO sultaine, and 92 parts of N-methylpyrrolidone into the reaction vessel, and The temperature was 25°C for 36 hours, and then left to defoam for 36 h...
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