Patent ID: 11878271
Assignee: HARRIS MEMBRANE CLEAN TECHNOLOGY INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A preparation method of a low-pressure high-flux hollow fiber nanofiltration (NF) membrane, comprising the following steps:
S1: preparing a base membrane;
S2: preparing a negatively-charged sulfonated polymer solution, and dip-coating the negatively-charged sulfonated polymer solution on an outer surface of the base membrane for 1 s to 30 min to contact the outer surface of the base membrane with the negatively-charged sulfonated polymer solution, taking a dip-coated base membrane out, and heating the dip-coated base membrane at 50° C. to 100° C. to remove a solvent through an evaporation to form a coating on the outer surface of the base membrane; and
S3: soaking the coating formed in S2 in a polyamine solution to allow a crosslinking reaction to form a separation layer;
wherein
a polyamine in the polyamine solution is selected from the group consisting of ethylenediamine (EDA), hexamethylenediamine (HMDA), and p-phenylenediamine;
the crosslinking reaction is to form a sulfamide crosslinking bond with a sulfonic acid group in a molecular chain of a sulfonated polymer as a crosslinking point.