芳纶纳米纤维膜的宏量制备及其高温过滤性能

Scale-up preparation of kevlar nanofiber membrane and its high temperature filtration performance

利用静电辅助溶液喷射纺丝设备制备了间位芳纶（PMIA）纳米纤维膜,通过单因素法研究了纺丝液浓度、感应电压、牵伸风压等纺丝工艺参数对纤维膜形貌、直径和平均孔径的影响规律。并进一步研究了不同面密度PMIA纳米纤维膜的过滤性能。结果表明：纺丝液浓度和感应电压影响着纤维分布和纤维形态,纺丝液浓度和牵伸风压对纤维直径影响较大,感应电压和纺丝液浓度对纤维膜的平均孔径影响显著;当纤维膜的面密度为11 g/m2时,其过滤效率可达到99.429%,压降为125.9 Pa,表明PMIA纳米纤维膜具有良好的过滤性能;且PMIA纳米纤维膜在278.2℃以下能保持稳定的热力学性能,有利于其在高温高效空气过滤材料领域的应用。

PMIA nanofiber membranes are prepared with home-made electrostatic-induction-assisted solution-blowing pilot-scale line. The influence of the process parameters on morphology, nanofiber diameter, average pore size and the high temperature filtration performances of PMIA nanofiber membranes with different gram weights are further studied with single factor method. The results show that the fiber distribution and fiber formation are affected by the spinning dope concentration and the induced voltage. The fiber diameter is significantly affected by spinning dope concentration and draft wind pressure. The average pore size of the fiber membrane is significantly affected by the induced voltage and the concentration of the spinning solution. When the weight of the fiber membrane is 11 g/m2, PMIA nanofiber membrane has good filtration performance with filtration efficiency upto 99.429% and pressure drop of 125.9 Pa, and can maintain stable thermodynamic properties below 278.2℃, which is beneficial for its application for high temperature high efficiency air filter materials.