Surface hydrophilicity modification process for separating fluoric polymer film

Abstract

The process of modifying surface hydrophilicity of separating fluoric polymer film includes the first pre-irradiating separating fluoric polymer film with high energy ray to make the surface macromolecular main chain generate active free radical, and the subsequent grafting the surface fluoric polymer film with high ionized hydrophilic sulfonic group in the grafting polymerization reaction system with double monomer of acrylic cid and sodium styrene sulfonate and water as dispersing medium in controlled reactant concentration, molar ratio, temperature and pH value. The process can improve the hydrophilicity of separating fluoric polymer film obviously, and the modified separating membrane has obviously decreased contact angle and lasting hydrophilicity.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a grafting reaction technology for surface modification of a fluorine-containing polymer separation membrane. Specifically, the graft copolymerization reaction of acrylic acid and sodium styrene sulfonate is initiated on the surface of the fluoropolymer separation membrane by pre-irradiation, and highly hydrophilic ionized sulfonic acid groups are introduced into the surface of the hydrophobic separation membrane in one step. Background technique [0002] Fluoropolymers such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), etc. are membrane materials with excellent comprehensive properties. Their outstanding chemical stability, thermal stability, low surface energy and dielectric properties are subject to increasing More and more attention has been paid to it, and it has broad application prospects in the field of membrane separation. St...

AI Technical Summary

Problems solved by technology

Strong hydrophobicity makes it uniquely advantageous in membrane separation processes such as membrane distillation, membrane absorption, and gas purification. However, hydrophobic microporous membranes will cause two problems when dealing with aqueous phase separation systems: one is low surface energy, and the fluid The driving force of mass transfer through the membrane is high, the energy consumption is large, and the water flux is low; the second is that it is very easy to adsorb organic matter, protein, etc. to cause membrane pollution, resulting in a decrease in flux and a shortened membrane life.

Images