聚偏氟乙烯微滤膜的制备及相转化工艺参数的优化
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Preparation of Polyvinylidene Fluoride Microfiltration Membrane and Optimization of Phase Inversion Process Parameters
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    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 4 min 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(8 650.74±305.29) L/(m2·h),同时,对 200 nm 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。

    Abstract:

    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 (8 650.74±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.

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引文格式
牛红男,王建明,黄洁萍,等.聚偏氟乙烯微滤膜的制备及相转化工艺参数的优化 [J].集成技术,2024,13(4):117-130

Citing format
NIU Hongnan, WANG Jianming, HUANG Jieping, et al. Preparation of Polyvinylidene Fluoride Microfiltration Membrane and Optimization of Phase Inversion Process Parameters[J]. Journal of Integration Technology,2024,13(4):117-130

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  • 收稿日期:2023-12-21
  • 最后修改日期:2023-12-21
  • 录用日期:2024-02-02
  • 在线发布日期: 2024-02-02
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