摘要
利用浓度分别为15%和8%的二醋酸纤维素纺丝液,采用静电纺丝的方法在商业聚对苯二甲酸乙二酯(PET)非织造布表面同时复合沉积纳米纤维/串珠纤维混合均匀的纤维膜,并在纤维膜上再覆盖一层PET无纺布,制备了复合过滤材料。研究了纤维形貌对复合过滤材料过滤性能的影响,并分析了复合时间、复合电压和纳米纤维/串珠纤维纺丝液供液比对复合过滤材料过滤性能的影响。结果表明,在纳米纤维中加入串珠纤维有利于在保证过滤效率的前提下降低过滤阻力;随着复合时间的增加,过滤阻力先缓慢增长而后迅速增加,过滤效率则先迅速上升而后缓慢增加;随着复合电压的增加,过滤阻力有所下降而过滤效率变化不大,当复合电压增加到24 k V时,过滤效率得到提升但同时过滤阻力大幅增加;随着串珠纤维含量的增加,过滤效率和阻力总体上呈先下降后增大的趋势。当复合时间为60 min,复合电压为22 k V,纳米/串珠纤维供液比为10∶5时,所制备的复合过滤材料的过滤阻力仅为115 Pa,对0.5μm以上微粒的过滤效率达到96%以上。
By using cellulose diacetate spinning solution with concentration of 15% and 8%, the fiber membrane with nanofibers / beaded fibers uniform composite structure was deposited on the surface of business PET non-woven fabric by electrospinning, then the composite filtration materials were made by coating another PET non-woven fabric on the surface of the electrospinning membrane. The influence of fiber morphology, composite time and voltage of electrospinning process and the volume ratio ofnanofibers and beaded fibers solution on the filtration performance were studied. The results show that adding beaded fibers in nanofibers can reduce the filtration resistance while make the filtration efficiency stable ; as the composite time increasing, the increase of the filtration resistance is slow at first and then becomes fast, while the increase of the filtration efficiency is fast at fu＇st and then becomes slow ; as the voltage increasing, the filtration resistance declines and the filtration efficiency changes a little, but when the voltage increases up to 24 kV, the filtration efficiency becomes to increase meanwhile the filtration resistance increases too much suddenly ; as the content of the beaded fibers increasing, both the filtration efficiency and filtration resistance first decrease and then increase in general. When the composite time is 60 rain, voltage is 22 kV, volume ratio of the nanofibers and beaded fibers solution is 10 ： 5, the filtration resistance of the prepared composite filtration material is only 115 Pa, and the filtration efficiency for particles with size ≥0.5 μm achieves 96% above.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2015年第10期18-22,共5页
Engineering Plastics Application
基金
江苏省产学研联合创新资金前瞻性研究项目(BY2014023-06)
中国烟草总公司科技重点项目(110201302007)
关键词
二醋酸纤维素
串珠纤维
过滤阻力
复合过滤材料
cellulose diacetate
beaded fiber
filtration resistance
composite filter material
