A kind of positively charged composite nanofiltration membrane and preparation method thereof
A composite nanofiltration membrane, positively charged technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The method is complicated and other problems, to achieve the effect of large market application prospect, simple preparation process and cheap raw materials
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[0082] (1) Preparation of modified meta-aramid polymer
[0083]Under nitrogen protection, add 80.383mL of DMAc solvent, 0.077mol of m-phenylenediamine, 0.0616mol of APBIA and 0.0154mol of 4-fluoro-1,3-phenylenediamine into a 1L four-necked flask equipped with mechanical stirring and a thermometer. Stir under nitrogen protection until the solute is completely dissolved. Use a freezing bath to adjust the reaction temperature to -15°C, add 0.1155mol of isophthaloyl chloride under stirring, control the reaction temperature of the reaction system below 0°C, and continue to add 0.0262mol of isophthaloyl dimethanol after reacting until the viscosity of the system is stable Acyl chloride, after the reaction until the viscosity of the system is stable, add 0.0123mol of isophthaloyl chloride at the end, the solution starts to thicken, the temperature rises, adjust the stirring speed to control the reaction temperature below 60°C until the reaction is complete, after adding 0.154mol of c...
Embodiment 1
[0110] (1) Preparation of aqueous solution: mix polyethyleneimine, piperazine, SDS and acid absorbent into deionized water to prepare an aqueous solution. In the aqueous solution, the molecular weight of polyethyleneimine is 3000, and the total content of polyethyleneimine and piperazine is 0.5% (w / v), and the ratio of piperazine in this total content is 5%, and the content of surfactant SDS is 0.3% (w / v), acid absorbent (NaCO 3 :NaOH=2:1) content is 0.3% (w / v).
[0111] (2) Preparation of organic solution: adding trimesoyl chloride to isoparaffin Isopar G to prepare an organic solution. The content of trimesoyl chloride in the organic solution is 0.05% (w / v).
[0112] (3) Immerse the modified meta-aramid hollow fiber base membrane in the aqueous solution, take it out after 1 minute, and dry it for 7 minutes after taking it out.
[0113] (4) Immerse the dried basement film in step (3) into an organic solution for interfacial polymerization, take it out after 1 minute, and...
Embodiment 2
[0116] Except that the total content of polyethyleneimine and piperazine was changed to 1.5% (w / v), other experimental conditions were the same as in Example 1.
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