聚醚胺D230对聚偏氟乙烯膜表面亲水改性及其油水分离性能  

Hydrophilic modification of polyvinylidene fluoride membrane surface by polyetheramine D230 and its oil-water separation performance

作　　者：李培军 董林芳 王明霞[3] 严峰[2] LI Peijun;DONG Linfang;WANG Mingxia;YAN Feng(Tianjin Sinopec Yuetai Technology Company,Tianjin 300384,China;School of Chemistry,Tiangong University,Tianjin 300387,China;School of Material Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津中石化悦泰科技有限公司,天津300384 [2]天津工业大学化学学院,天津300387 [3]天津工业大学材料科学与工程学院,天津300387

出　　处：《天津工业大学学报》2024年第2期29-35,共7页Journal of Tiangong University

基　　金：天津市自然科学基金面上资助项目(18JCYBJC89300)。

摘　　要：针对聚偏氟乙烯(PVDF)油水分离膜普遍存在分离效果差、易受油污染等问题,受破乳剂多支链聚醚的化学结构和水下超疏油生物表面启发,将具有聚氧丙烯链段的聚醚胺D230引入到PVDF膜表面,构建聚醚胺功能化聚偏氟乙烯(PVDF)超滤膜。首先将PVDF与聚苯乙烯马来酸酐(SMA)共混,采用非溶剂致相转化法制备表面富含酸酐基团的SMA/PVDF膜,然后将膜浸泡于聚醚胺D230溶液中,聚醚胺的端胺基与膜表面的酸酐基团进行表面原位接枝,从而将亲水性聚醚链段固载于膜表面,改善膜表面润湿性和抗污染性。探究聚醚胺D230对膜表面的亲水改性效果及改性膜对含油污水的分离性能。结果表明:随着反应时间延长,膜表面D230的接枝率上升,在最优反应时间9 h下,达到接枝率387.8 mg/g;SMA/PVDF膜表面接枝D230后,膜表面的亲水性显著增强,纯水接触角降低至48.5°,水通量从接枝前的30 L/(m^(2)·h)提高至87 L/(m^(2)·h);D230接枝SMA/PVDF膜表现出水下超疏油特性,其对煤油的水下油接触角达到152°,且对油无黏附性,表现出良好的抗油污性能;D230接枝SMA/PVDF膜对十二烷基硫酸钠(SDS)稳定的煤油/水乳状液具有分离效果,截油率达到99.0%,远高于SMA/PVDF对照膜的60.8%,在油水分离领域具有潜在应用价值。In response to the common problems of poor separation efficiency and susceptibility to oil contamination in polyvinylidene fluoride(PVDF)oil-water separation membranes,in the light of the chemical structure of the multibranched polyethers of demulsifiers and the submerged ultra-oleophobic surface,polyetheramine D230 with polyoxypropylene chain segments were introduced into the PVDF membrane surface to construct polye-theramine functionalized PVDF ultrafiltration membrane.Firstly,PVDF was blended with polystyrene maleic anhydride(SMA),and SMA/PVDF membranes with surface rich in anhydride groups were prepared by non-solvent induced phase transformation method.Then the membranes were immersed in polyetheramine D230 solution,and the terminal amine groups of polyetheramine were surface grafted in situ with the anhydride groups on the membrane surface.Thus,hydrophilic polyether segments are immobilized on the surface of the membrane to improve the wettability and anti-fouling properties of membrane surface.The effects of polyetheramine D230 on the hydrophilic modification of membrane surface and the separation performance of O/W emulsion were investigated.The results showed that the grafting rate of D230 on the membrane surface increased with the increase of reaction time.The grafting rate of 387.8 mg/g was reached at the optimal reaction time of 9 h.The grafting of D230 on the surface of SMA/PVDF membrane significantly enhanced the hydrophilicity of the membrane surface,reduced the pure water contact angle to 48.5°,and increased the water flux from 30 L/(m^(2)·h)to 87 L/(m^(2)·h).In addition,the D230 grafted SMA/PVDF membrane exhibited super underwater oleophobic properties,with a underwater oil contact angle of 152°for kerosene and no adhesion to oil,showing good anti-oil fouling performance.D230 grafted SMA/PVDF membrane has a separation effect on SDS stabilized kerosene/water emulsion with an oil rejection rate of 99.0%,which was much higher than that of SMA/PVDF membranes(60.8%).It has potential application in

关 键 词：聚苯乙烯马来酸酐(SMA) 聚醚胺 聚偏氟乙烯(PVDF)膜 表面接枝 亲水改性 油水分离 

分 类 号：TQ028.8[化学工程]