梯度结构耐高温纤维过滤材料的结构与性能

Structure and performance of high temperature resistant fibrous filters with gradient structure

为探究梯度结构纤维过滤材料的制备工艺对过滤材料结构、性能的影响,制备了聚苯硫醚纤维-聚四氟乙烯超细纤维(PPS-PTFE)滤料,并分析了制备工艺(超细纤维层面密度和水针能量)对结构和过滤性能的影响,建立了对应的二次方模型。结果表明:超细纤维层的面密度对孔径大小和过滤效率均有显著的影响,随着超细纤维层面密度从(49±3.8)g/m^2增大到(181±12.5)g/m^2,试样的模态孔径从20.22μm降低到12.52μm,而对2.05μm颗粒物的过滤效率从63.41%提高到91.87%;水针能量在3 738~8 755 J/g范围内,过滤效率和过滤阻力均随着水针能量的增大而增大;建立的二次方模型的置信度高,表明模型适用于梯度结构的耐高温纤维过滤材料的工艺设计。

In order to study effect of the preparation process on structure characteristics and filtration performance,the samples of gradient filters comprising PPS fibers and PTFE microfibers were made. The relationships between the process（ gram weight of microfiber layers and the hydroentangling energy） and structure characteristics were discussed,and the quadratic models also were established. The results show that the gram weight of PTFE microfiber layers has a significant influence on structure and filtration performance of the samples. The model pores size of samples is 20. 22 μm,the filtration efficiency is 63. 41% for 2. 05 μm when the PTFE microfiber layers gram weight is（ 49 ± 3. 8） g / m^2. As the PTFE microfiber layers gram weight increased to（ 181 ± 12. 5） g / m^2,the model pores size reduced to12. 52 μm,and filtering efficiency of the 2. 05 μm particle increased to 91. 87%. In addition,it is also found that the filtration efficiency and filtration resistance increased with the hydroentangling energy in the range of 3 738- 8 755 J / g. Furthermore,quadratic models have high degree of confidence intervals,which means that the models is good for the process design of the high temperature resistant fibrous filters with a gradient structure.