Preparation method for monoamine-grafted-and-modified crosslinked polyimide solvent-resistant nanofiltration membrane
A technology of polyimide and nanofiltration membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of reducing energy consumption, major application prospects, and improving stability
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[0024] Embodiment 1: a kind of preparation method of monoamine graft modified cross-linked polyimide solvent-resistant nanofiltration membrane, comprises the following steps:
[0025] a. N-methylpyrrolidin and acetone are 1:5 in mass ratio;
[0026] b. Add 15% to 28% polyimide solution to the mixed solution to make a casting solution;
[0027] c. Add 5% Tris in the casting liquid, and at 75 o Stir and mix at C temperature for 12 hours to ensure complete grafting;
[0028] d. Utilize the immersion precipitation phase inversion method to prepare the membrane, and wash the formed membrane with deionized water several times for later use;
[0029] e. configure the methanol solution of 20% concentration of hexamethylenediamine;
[0030] f. Put the formed film into the diamine alcohol solution prepared in the previous step for cross-linking modification for 1 h;
[0031] g. After the reaction is over, put the membrane into a methanol solvent for soaking and cleaning to obtain a ...
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