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采用静电纺丝技术将二醋酸纤维素纳米纤维直接沉积在聚对苯二甲酸乙二纯酯(PET)非织造布基材表面上,并在纳米纤维膜上覆1层PET无纺布,制备成三明治结构的复合滤材。研究了不同条件对复合过滤材料过滤性能的影响。结果表明:均匀纳米纤维有利于提高复合滤材的过滤效率而串珠纤维有利于降低复合滤材的过滤阻力;随着纺丝时间和电压的增大,复合滤材的过滤效率和过滤阻力都呈现增大的趋势;随着空气流量的增加,复合滤材的过滤效率几乎不变,但过滤阻力却呈现线性增大的趋势。当选择纺丝时间为60min,纺丝电压为18kV时所制备的串珠状复合纤维过滤材料,能对粒径0.5μm的颗粒达到99%以上的过滤效率。
The electrospinning technique was used to deposit cellulose diacetate nanofibers directly onto the surface of polyethylene terephthalate (PET) non-woven fabric substrate. A layer of PET non-woven fabric was coated on the nanofiber film to prepare Into a sandwich structure of the composite filter. The effects of different conditions on the filtration performance of composite filter materials were studied. The results showed that the uniform nanofibers could improve the filtration efficiency of the composite filter while the beaded fiber could reduce the filtration resistance of the composite filter. With the increase of spinning time and voltage, the filtration efficiency and filtration resistance of the composite filter appeared Increasing trend; with the increase of air flow, the filtration efficiency of the composite filter hardly changes, but the filtration resistance shows a linear increase trend. When the spinning time is 60min and the spinning voltage is 18kV, the beaded composite fiber filter can filter more than 99% of the particles with particle size of 0.5μm.