Melt-blown polypropylene electret fabric prepared by hydrocharging technique has excellent filtration performance. However, its filtration mechanism and charge characteristic have not been clarified yet. This paper reports some new investigating results. Its filtration efficiency is correlated to its trapped charge. To achieve high filtration performance, deionized water with high resistivity must be adopted; both water spray pressure and drying temperature need to be kept within a suitable range. The positive and negative charges coexist and exhibit the characteristic of electric double layer in the MBPP electret fabric. In addition, the surface potential is significantly lower than the corona charged electret fabric.

采用水荷电技术制备的熔喷聚丙烯驻极体织物具有优良的过滤性能。然而，其过滤机理和电荷特性尚未阐明。本文报告了一些新的调查结果。它的过滤效率与其捕获的电荷相关。为达到高过滤性能，必须采用高电阻率的去离子水；喷水压力和干燥温度都需要保持在合适的范围内。MBPP驻极体织物中正负电荷共存并表现出双电层特性。此外，表面电位明显低于电晕充电驻极体织物。