Patent ID: 11878921
Assignee: ZHEJIANG JINMO ENVIRONMENTAL TECHNOLOGY CO., LTD
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC C

Claim 0:
1. A preparation method of a nanofiltration membrane for treating printing and dyeing wastewater, comprising the following steps:
S1, pouring an aqueous solution containing m-phenylenediamine, camphorsulfonic acid and triethylamine onto a surface of a polysulfone ultrafiltration membrane, setting still for 10 s to 30 s, and then removing the excess aqueous solution from the surface, wherein a content of m-phenylenediamine ranges from 0.7 wt % to 2 wt %, a content of camphorsulfonic acid ranges from 2 wt % to 2.5 wt %, and a content of triethylamine ranges from 1 wt % to 1.5 wt %;
S2, pouring an organic solution containing trimesoyl chloride and an interface auxiliary polymerization agent onto the surface of the membrane obtained in step S1, reacting for 5 s to 20 s, and then removing the excess solution from the surface,
wherein the interface auxiliary polymerization agent is acetone or acetic ester; a content of the acetone ranges from 0.5 wt % to 1 wt %, and a content of acetate ranges from 0.3 wt % to 8 wt %;
a content of the trimesoyl chloride ranges from 0.03 wt % to 0.1 wt %; and
S3, setting the membrane obtained in step S2 still and then carrying out heat treatment and water rinsing on the membrane in sequence, thus obtaining the nanofiltration membrane.