单位: 东华大学,材料科学与工程学院,纤维材料与改性国家重点实验室,上海,01600
关键词: 纳滤膜,聚丙烯,中空纤维膜,染料过滤
分类号: TQ051.893
出版年,卷(期):页码: 2022,42(3):7-14

  面对聚丙烯纳滤膜制备技术的空白,我们采用溶解诱导致孔法以聚环氧乙烷为致孔剂与聚丙烯进行共混,通过双螺杆挤出机熔融挤出成型,经过拉伸、空气冷却、收丝和水洗等工艺,首次加工制得了非复合聚丙烯中空纤维纳滤膜。为了进一步提高中空纤维膜的过滤通量和亲水抗污能力,亲水性二氧化硅纳米粒子通过熔融共混的方式被嵌入到中空纤维膜的壁中,为了减少排放和降低成本,试验尝试了对致孔剂聚环氧乙烷进行回收再利用,通过用水对原丝进行浸泡萃取,探究了最佳回收水/聚环氧乙烷的质量比和浸出时间。同时,为验证聚丙烯中空纤维膜的稳定性,甲基蓝和酸性红被用来作为截留物质进行了60小时的长周期试验。结果表明,聚丙烯中空纤维纳滤膜对甲基蓝和酸性红的截留具有稳定的通量,相比于未添加亲水性纳米二氧化硅粒子的中空纤维膜,改性膜的截留率达到了100%,通量达到39 L/(m2·h·0.1MPa),同时,最佳条件下的致孔剂回收率也达到99%,为聚环氧乙烷的闭环利用提供了理论和实验基础。实验结果证明以聚环氧乙烷为致孔剂的溶解诱导致孔法是一种稳定、高效和可循环的聚丙烯中空纤维纳滤膜的制备方法。
 Facing the blank of polypropylene nanofiltration membrane preparation technology, we used the dissolution-induced pore method to blend the polypropylene with polyethylene oxide as the pore-forming agent, and extruded through a twin-screw extruder. The non-composite polypropylene hollow fiber nanofiltration membrane was processed for the first time through the processes of, air cooling, filament winding and water washing。In order to further improve the filtration flux and hydrophilic antifouling ability of the hollow fiber membrane, hydrophilic silica nanoparticles were embedded in the wall of the hollow fiber membrane by melt blending. And to reduce emissions and reduce costs, the experiment tried to recycle and reuse the porogen polyethylene oxide. The raw fiber was soaked and extracted with water. The best recovered water/polyethylene oxide mass ratio and leaching time were investigated in detail. At the same time, to verify the stability of the polypropylene hollow fiber membrane, methyl blue and acid red were used as the retention material for a long period test of 60 hours. The results show that the polypropylene hollow fiber nanofiltration membrane has a stable flux for the rejection of methyl blue and acid red. Compared with the hollow fiber membrane without the addition of hydrophilic nano silica particles, the rejection of the modified membrane is 100%, and the flux is as high as 39 L/(m2·h·0.1MPa). At the same time, the recovery rate of the porogen under the optimal conditions is also as high as 99%, which provides a theoretical and theoretical basis for the closed-loop utilization of polyethylene oxide. The experimental results prove that the dissolution-induced pore-forming method with polyethylene oxide as the porogen is a stable, efficient and recyclable polypropylene hollow fiber nanofiltration membrane preparation method.



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