Nanofiltration membrane material with high surface roughness and preparation method thereof

• Main Authors: LIU NIAN, CHENG QIN, XIA MING, WANG DONG, CHENG PAN, XU JIA, GUO QIHAO, WAN YUCAI, LIU KE, MA SIQI
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2020
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention discloses a nanofiltration membrane material with high surface roughness and a preparation method thereof. A polymer nanofiber coating with small aperture, high uniformity, strong hydrophilicity, high compactness and high surface roughness is prepared by adopting a wet non-woven technology, so that the subsequent interfacial polymerization is facilitated, a separation layer with small thickness and excellent nanofiltration separation performance is formed, and the rejection rate and permeability can be remarkably improved; meanwhile, nanofibers with large variable coefficient diameter distributing are adopted; the formed compact nanofiber coating material is composed of crude fibers and fine fibers, the fine fibers are flexibly lapped among the coarse fibers to form an obvious undulating coating surface profile, and the formed compact nanofiber coating material is used as a middle layer of the nanofiltration membrane, and is helpful for forming an interfacial polymerization separation layer with