电晕驻极熔喷聚丙烯驻极体非织造布的电荷捕获特性

Characteristics of charge capture of melt-blown polypropylene electret nonwovens by corona charging

针对不同驻极条件下获得的熔喷聚丙烯驻极体非织造布的过滤性能存在差异,以及使用环境对其电荷存储稳定性的影响机制尚不清楚的问题,采用热刺激放电和表面电位分布测量技术,研究了驻极条件与材料电荷存储性能的相关性,考察了水和酒精熏蒸对材料的电荷存储稳定性的影响。结果表明:正、负电荷的陷阱能级相近,但正电晕驻极非织造布的过滤性能优于负电晕驻极;表面电位高低不能准确反映非织造布过滤性能的优劣;水熏蒸后非织造布的过滤效率变化很小,酒精熏蒸后其过滤效率衰减至与未驻极样品相同。该研究结果可为熔喷聚丙烯驻极体非织造布材料的生产及其在高湿度和医用环境下的使用提供参考。

Aiming at the differences in the filtering performance of melt-blown polypropylene(MBPP)electret nonwovens obtained under different charging conditions and the applied environment influence on their charge storage stability,correlation between the charging conditions and the charge storage performance of the MBPP electret nonwovens was investigated based on the thermally stimulated discharge technology and measurement of surface potential distribution.The influence of water and alcohol fumigation on the charge storage stability was studied.The experimental results show that the energy levels of positive and negative charge trap are similar,but the filtering performance of the positive corona charging nonwoven is better than that of the negative corona charging.The surface potential values are not able to reflect accurately the quality of their filter performance.The filter efficiency of the nonwovens attenuates a little after water fumigation,and it attenuates a lot after alcohol fumigation,to the same the level as that without charging.This research provided a basis for the production and application of MBPP electret nonwovens under high humidity and medical environments.