Polyvinylidene fluoride separation film with adjustable film holes and preparation method thereof
A polyvinylidene fluoride, adjustable technology, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of insufficient modification of polyvinylidene fluoride, poor separation performance and pollution resistance , to achieve the effect of easy industrial implementation, simple equipment and simple process
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Embodiment 1
[0020] (1) Preparation of intelligent high molecular polymer: take 5.0g monomer N-isopropylacrylamide (NIPAM), 0.05g initiator azobisisobutyronitrile (AIBN) and 50ml absolute ethanol, pass N 2 After 30 minutes, the system was sealed and reacted at a constant temperature of 65°C for 8 hours; the solution after the reaction was spin-dried at 55°C and vacuum-dried for 24 hours to obtain the solid product PNIPAM;
[0021] (2) Preparation of casting solution: Dissolve PVDF powder and PNIPAM prepared in step (1) in N,N-dimethylformamide (DMF) in different blending ratios, and stir at 60°C to obtain a completely transparent solution , standing under vacuum conditions for degassing 1h, the obtained PNIPAM content is respectively 0%, 0.5%, 1.5% and 2.5%, and the mass concentration is the casting solution of 16% (wt%);
[0022] (3) Preparation of flat film: Pour the casting solution obtained in step (2) on a dry and smooth glass plate, scrape it evenly with a glass rod to form a film, i...
Embodiment 2
[0024] (1) Preparation of intelligent high molecular polymer: get 5.0g monomer NIPAM, 0.05g initiator AIBN, crosslinking agent N, N'-methylenebisacrylamide (MBAA) 0.3g and 500ml absolute ethanol, pass N 2 After 30 minutes, the system was sealed and reacted at a constant temperature of 70°C for 8 hours; the solution after the reaction was spin-dried at 55°C and vacuum-dried for 24 hours to obtain the solid product PNIPAM;
[0025] (2) Preparation of casting solution: Dissolve PVDF powder and PNIPAM prepared in step (1) in N,N-dimethylformamide (DMF) in different blending ratios, and stir at 65°C to obtain a completely transparent solution , standing under vacuum conditions for degassing 2h, obtaining PNIPAM content is respectively 0%, 0.5%, 1.5% and 2.5%, and the mass concentration is the casting solution of 16% (wt%);
[0026] (3) Preparation of flat film: Pour the casting solution obtained in step (2) on a dry and smooth glass plate, scrape it evenly with a glass rod to form...
Embodiment 3
[0028] (1) with embodiment 1;
[0029] (2) Preparation of casting solution: Dissolve PVDF powder and PNIPAM prepared in step (1) in N,N-dimethylacetamide (DMAC) in different blending ratios, and stir at 70°C to obtain a completely transparent solution , standing for degassing under vacuum conditions for 2 hours to obtain the casting solution;
[0030] (3) With embodiment 1.
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