用于膜蒸馏的PVDF/PDMS疏水复合膜的研究及性能优化
作者:白静娜,赵金龙,吕宾,王洪声
单位: 北京中环膜材料科技有限公司,北京101500
关键词: 表面涂敷;聚二甲基硅氧烷;聚偏氟乙烯;正交实验;膜蒸馏
出版年,卷(期):页码: 2016,36(4):30-37

摘要:
 通过表面涂覆法制备了聚偏氟乙烯/有机硅疏水复合膜。实验将聚二甲基硅氧烷、正硅酸乙酯及催化剂按一定比例混合,涂于聚偏氟乙烯中空纤维膜基膜表面并固化交联,系统研究和讨论了影响涂层效果的主要因素,得到了正交实验的最优因子组合,使改性后的膜丝具有较好的性能。结果表明:在正己烷/聚二甲基硅氧烷/正硅酸乙酯/催化剂体系中,正硅酸乙酯含量是影响膜蒸馏水通量的主要因素;聚二甲基硅氧烷含量对膜的透气系数的影响最大,浸泡时间主要影响膜的疏水性。优化的疏水涂层条件为: m(聚二甲基硅氧烷) : m(正硅酸乙酯) : m(催化剂)=10:2:1(质量比),涂层温度28℃,浸泡时间20s。测试结果显示,有机硅涂敷后聚偏氟乙烯膜的表面静态接触角从83°提高到116°,且膜蒸馏通量保持率达90%以上,通量随运行时间延长的衰减情况得到改善。
 In this paper, Polydimethylsiloxane(PDMS), ethyl orthosilicate(TEOS) and Dibutyl tin dilaurate(DBTDL) catalyst were employed as surface coating agents on polyyinylidene fluoride(PVDF) hollow fiber membrane to prepare PVDF/organosilicon hydrophobic composite membrane. Through systematic experiments, coating formulations and process parameters were optimized. The results showed that, the membrane distillation(MD) flux was mainly determined by the TEOS content; and the permeability coefficient was greatly affected by the PDMS portion; while the membrane contact angle was depended on the soaking time. With optimized portions and conditions of m(PDMS) 10: m(TEOS) 2: m(DBTDL)1 (mass ratio) under coating temperature 28℃ and soaking time 20s,the modified composite membrane shows improved MD flux running time loss and hydrophobic property(contact angle from 83°to 116 ), as well as a good flux retention rate.
第一作者简介:白静娜(1986-)女,河北石家庄,硕士研究生,从事膜分离技术,E-mail:baijingna9@126.com

参考文献:
 [1] 唐 娜,蒋建伟,袁丽娜,等. 热致相分离聚乙烯一聚丙烯共混平板疏水微孔膜的 
制备及其膜蒸馏性能研究[J]. 膜科学与技术,2013,33(6):47-52.
[2] 孔瑛,杨金荣,李阳初,等. 聚酰亚胺微孔膜疏水化用于膜蒸馏[J]. 功能高分子学报,1997,10(2):260-264.
[3] 唐  娜,刘家祺,马敬环. 用膜蒸馏的膜材料现状[J]. 化工进展,2003,22(8):808-812.
[4] 徐 丽,许 颖,杜春慧,等. 聚醚砜微孔膜的疏水改性及其在膜蒸馏中的应用[J]. 功能材料,2007,32(8):573-579.
[5] 林汉阳,武春瑞,吕晓龙. 聚偏氟乙烯膜的超疏水改性研究[J]. 膜科学与技术,2010,30(2):39-44.
[6] SongZ Y, XingM H, ZhangJ,et al. Determination of phase diagram of a ternary PVDF/c -BL/DOP system in TIPSprocess and its application in preparing hollow fiber membranes for membranedistillation[J]. Sep Purif Technol,2012,90:221-230.
[7] Young -Deuk K,Kyaw T,Noreddine G ,et al. Performance investigation of a solar-assisted direct contact membrane distillation system[J]. J Membr Sci ,2013,427:345– 364.
[8] Khayet M. Experimental design and optimization of asym-metric flat-sheet membranes prepared for direct contact membranedistillation[J]. J Membr Sci,2010,351:234 –245.
[9] Teoh M,Chung T.Membrane distillation with hydrophobic macmvoid-free PVDF-PTFE hollow fibre membranes [J].Sep and Purif Technol,2009,66:229-236
[10] Fan H W, Peng Y L, Li Z H. Preparation and characterization of hydrophobic PVDF
membranes by vapor-induced phase separationand application in vacuum membrane 
disti llation[J]. J Polym Res,2013,20:134-149.
[11] Liu G P, Xiangli F J, Wei W. Improved   performance  of   PDMS/ceramic  composite   pervaporation   membranesby  ZSM-5  homogeneously  dispersed   in   PDMS   via  a  surface  graft/coating  approach[J].  Chem Eng J,2011,174:495– 503.
[12] Mazo M A,Nistal A, Caballero A C. Influence   of   processing  conditions  in   TEOS/PDMS  derived   siliconoxycarbide  materials.   Part   1:   Microstructure   and  properties[J].  JEurCeram Soc,2013,, 33:1195–1205.
[13] Almeida J C,Castro A G B,Lancastre J J H. Structural characterization of 
PDMS-TEOS-CaO -TiO2hybridmaterials obtained by solegel[J]. Mater Chem Phy,2014,143 ,: 557-563.
[14] JessieLue S J,Chien C F,Mahesh K P O. Pervaporative   concentration   of   ethanol–water  mixtures  using  heterogeneouspolydimethylsiloxane  (PDMS)   mixed  matrix  membranes[J].  J Membr Sci ,2011,384:17– 26.
[15] Li P, Chen H Z, Chung T S. The effects of substrate characteristics and pre-wetting agents on PAN–PDMScomposite hollow fiber membranes for CO2 /N2 and O2 /N2separation[J]. J Membr Sci ,2013,434:18–25. 
[16] 王平,郭洪献,宋兰花,等. 含氮硅烷对聚二甲基硅氧烷涂膜表面疏水性的影响[J]. 高分子学报,1995,6:699-703.
[17]吕晓龙. 中空纤维多孔膜性能评价方法探讨[J]. 膜科学与技术,2011,31(2):1-6.
[18]何铁峰. 膜蒸馏系统传热传质过程优化实验研究[D]. 内蒙古工业大学,2009: 1-53.
 

服务与反馈:
文章下载】【加入收藏

《膜科学与技术》编辑部 地址:北京市朝阳区北三环东路19号蓝星大厦 邮政编码:100029 电话:010-64426130/64433466 传真:010-80485372邮箱:mkxyjs@163.com

京公网安备11011302000819号