Method for preparing durable hydrophilic ultrafiltration membrane

A method for preparing a hydrophilic ultrafiltration membrane, comprising the following steps:

• stirring a polymer membrane material, an active molecule A, an active molecule B, and a solvent at a constant temperature, such that during dissolution of the polymer membrane material, functional hydrophilic molecules are synchronously synthesized and a casting solution is obtained;
• and
• preparing an ultrafiltration membrane from the casting solution by dry-wet phase separation, initiating a cross-linking reaction between the functional hydrophilic molecules by using a coagulation bath to form a cross-linked network in situ;
• allowing the cross-linked network and a molecular chain of the polymer membrane material to jointly form a cross-linked interpenetrating network during the dry-wet phase separation;
• and controlling the dry-wet phase separation by forming cross-links in situ to limit movement of polymer chains and formation and growth of micelles, thereby forming a uniform polymer interpenetrating network structure to obtain the hydrophilic ultrafiltration membrane with a uniform membrane pore structure;
• wherein the active molecule A is a molecule comprising an amino group and a alkoxysilane group and the active molecule B is a diglycidyl ether functional hydrophilic molecule;
• wherein the polymer membrane material is selected from the group consisting of polysulfone (PSF), polyethersulfone (PES), polyacrylonitrile (PAN), and a mixture of two or more thereof;
• and
• wherein the active molecule B is selected from the group consisting of diglycidyl ether, glycerol diglycidyl ether, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, polyethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, and a mixture of two or more thereof.