PTFE覆膜口罩的过滤性能
Filtration Performance of PTFE Membrane Coated Mask
柳静献 1周肖童 1赫伟东 1赵翰鹏2
作者信息
- 1. 东北大学 资源与土木工程学院,辽宁 沈阳 110819
- 2. 中国铁道科学研究院集团有限公司 标准计量研究所,北京 100081
- 折叠
摘要
聚四氟乙烯(polytetrafluoroethylene,PTFE)覆膜口罩作为新型呼吸防护用品,在职业健康领域得到广泛关注,然而在高湿环境中其过滤性能的稳定性有待明确.通过过滤效率和过滤阻力的测试对PTFE覆膜口罩进行了耐湿性能评估,并与熔喷布口罩进行对比.结果表明:经高湿环境后PTFE覆膜口罩的过滤效率最大降幅为3.20%,而熔喷布口罩的最大降幅仅为0.44%,测试过程中两种口罩的过滤阻力均无显著变化;PTFE膜的纤维直径(20～150 nm)与孔径(100～350 nm)远小于熔喷布的纤维直径与孔径,其主要基于机械过滤机理捕集颗粒物;在高湿环境中,具有静电吸附性能的熔喷布更易实现高效低阻.研究结果为合理选用PTFE覆膜口罩提供了指导.
Abstract
Polytetrafluoroethylene(PTFE)membrane coated mask,as a new type of respiratory protective equipment,has received extensive attention in the field of occupational health.However,the stability of filtration performance of PTFE membrane coated mask in the high humidity environment needs to be determined.The moisture resistance of PTFE membrane coated masks is evaluated by the tests of filtration efficiency and pressure drop,and compared with nonwoven masks.The results show that the maximum reduction of the filtration efficiency of PTFE membrane coated masks is 3.20%after the high humidity environment,while the maximum reduction of nonwoven masks is only 0.44%,and there is no significant variation in the filtration pressure drop of the two types of masks during the test process.The fiber diameter(20～150 nm)and pore size(100～350 nm)of PTFE membrane are much smaller than those of nonwovens,which is mainly based on the mechanical filtration mechanism to capture particles.In high humidity environment,nonwoven with electrostatic adsorption performance is easier to achieve high filtration efficiency and low pressure drop.The results of this study provide a guidance for the rational selection of PTFE membrane coated masks.
关键词
口罩/PTFE膜/过滤性能/孔径/纤维直径Key words
mask/PTFE membrane/filtration performance/pore size/fiber diameter引用本文复制引用
出版年
2024
NETL
NSTL
万方数据