聚偏氟乙烯微滤膜的制备及相转化工艺参数的优化  

Preparation of Polyvinylidene Fluoride Microfiltration Membrane and Optimization of Phase Inversion Process Parameters

作　　者：牛红男 王建明 黄洁萍 姬婧 NIU Hongnan;WANG Jianming;HUANG Jieping;JI Jing(Guangzhou Institute of Advanced Technology,Guangzhou 511458,China)

机构地区：[1]广州先进技术研究所,广州511458

出　　处：《集成技术》2024年第4期117-130,共14页Journal of Integration Technology

摘　　要：作者采用非溶剂致相分离的方法,以聚偏氟乙烯(polyvinylidene fluoride,PVDF)为原料,以N,N-二甲基乙酰胺为溶剂制备微滤膜,探究非溶剂添加剂的种类与含量、预蒸发时间、环境湿度等因素对膜的微观结构、纯水通量及表面亲疏水性的影响。结果表明:固定PVDF的质量分数为16%,将异丙醇(质量分数为16%)和甘油(质量分数为6%)混合物作为添加剂,放入相对湿度为80%的环境中预蒸发4min后浸入水浴凝固,可获得具有大孔径、高通量、高疏水性的PVDF微滤膜。该PVDF膜的表面结构完全开放,支撑层由连通的蜂窝状孔结构组成,浸润后的水通量可达到(8650.74±305.29)L/(m^(2)·h),同时,对200nm的聚苯乙烯微球的截留率为99%以上。此外,该PVDF微滤膜的表面接触角为(122±3)°,有望用于生物医药生产过程中的空气除菌过程。In this work,microfiltration membrane were prepared using polyvinylidene fluoride(PVDF)and N,N-dimethyl acetamide as the solvent via non-solvent induced phase separation technique.The effects of types and loading amounts of the non-solvent additives,pre-evaporation time and relative humidity on the membrane structure,pure water permeance and surface hydrophilicity/hydrophobicity were investigated.It was found that hydrophobic PVDF microfiltration membrane with large pore size and high permeance could be obtained by adding isopropanol(w=16%)and glycerol(w=6%)in the dope solution(w(PVDF)=16%),followed by evaporation for 4 min at relative humidity of 80%before being immersed in water.The PVDF membrane possessed a completely open surface and supporting layer with interconnected sponge-like porous structure.The prepared PVDF membrane showed high pure water flux of(8650.74±305.29)L/(m2·h)after pre-wetting and 200 nm-polystyrene-microspheres rejection of more than 99%.In addition,the PVDF microfiltration membrane was hydrophobic with water contact angle of(122±3)°,which make the membrane as a promising candidate used for gas sterilization in the bio-pharmaceutical manufacturing process.

关 键 词：聚偏氟乙烯 微滤膜 非溶剂致相分离 除菌 

分 类 号：TQ028.8[化学工程]