PVDF浸没式中空纤维超滤膜的制备.pdf

工艺管控

PVDF浸没式中空纤维超滤膜的制备

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叶书荣，王献德，杜亚强

(华电水务装备(天津)有限公司，天津301700)

摘要：为实现聚偏氟乙烯(PVDF)浸没式中空纤维超滤膜的稳定制备，文章采用干-湿相分离法，通过调节配方中PVDF

含量，提高中空纤维膜在纺丝时的可纺性，每个配方进行三轮实验，验证该配方及工艺的重现性。实验结果表明：膜纯水

透过率、膜断裂伸长率随着PVDF含量的增多而减小；膜的断裂强力及断裂强度、膜的泡点压力随着PVDF含量的增大

而增大；膜纯水透过率的衰减率随着PVDF含量的增大而减小，但膜的抗污染能力提高；膜最大孔径可控制在0.1μm

以下，当配方中PVDF含量为20%时，膜的外表面孔径在0.03～0.04μm，孔径分布均匀；膜性能及膜结构形态重现性

良好。综上所述，当PVDF含量为20%时，膜的综合性能、结构较好，可选择该配方进行纺丝生产。

关键词：浸没式超滤膜；聚偏氟乙烯；膜纯水透过率；膜孔径

中图分类号：TQ028.8文献标志码：A 文章编号：1008-4800(2024)33-0154-07

DOI:10.19900/ki.ISSN1008-4800.2024.33.038

PreparationofPVDFImmersedHollowFiberUltrafiltrationMembrane

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YEShurong,WANGXiande,DUYaqiang

(HuadianWaterEquipment(Tianjin)CompanyLimited,Tianjin301700,China)

Abstract:Inordertoachievestablepreparationofpolyvinylidenefluoride(PVDF)immersedhollowfiberultrafiltrationmembrane,

thedryandwetphaseseparationmethodwasusedinthisexperiment.ByadjustingthePVDFcontentintheformula,thespinnability

ofthehollowfibermembraneduringspinningwasimproved.Threeroundsofexperimentswereconductedoneachformulatotest

thereproducibilityoftheformulaandprocess.Theexperimentalresultsshowthatthepurewaterpermeabilityandtheelongationat

breakofthemembranedecreasewiththeincreaseofPVDFcontent;Thebreakingforceandbreakingstrengthofthemembrane,as

wellasthebubblepointpressureofthemembrane,increasewiththeincreaseofPVDFcontent;Theattenuationrateofmembrane

purewaterpermeabilitydecreaseswiththeincreaseofPVDFcontent,whilethemembrane’santifoul