水驻极聚丙烯熔喷材料的结构及过滤性能

Structure and filtration performance of water electret polypropylene meltblown material

以聚丙烯熔喷材料为基布,通过表征驻极前后材料的结构、设计动静态过滤性能测试及老化试验,并以电驻极材料为对比,展开对水驻极技术的研究。结果表明水驻极技术并不改变材料的结晶度、晶粒尺寸及主体化学结构,但会使材料的厚度及力学性能发生变化。水驻极后材料的介电性能得到改善,透气性能无显著变化。当气体流速由32 L/min增加到85 L/min时,相较电驻极材料,水驻极材料的盐性及油性的品质因子更高,过滤效果更好。当气体流速为85 L/min时,经盐性和油性加载20 min后,水驻极材料的过滤效率分别仅下降了0.93%、0.95%,表现出稳定且优良的过滤性能。材料经高低温老化后的过滤性能测试结果表明,水驻极材料内的电荷衰减受温度的影响较小。

Using polypropylene meltblown material as the base fabric,through characterizing the structure of the material before and after the electret,designing dynamic and static filtration tests and aging experiments,and comparing those of the electric electret materials,the research on the water electret technology is carried out.The results show that the water electret technology does not change crystallinity,grain size and main chemical structure of the material,but it changes the thickness and mechanical properties of the material.After the water electret,the dielectric properties of the material are improved,and there is no significant change in the air permeability.When the gas flow rate increases from 32 L/min to 85 L/min,compared with the electric electret material,the water electret material has higher salt and oily quality factors,and better filtering effect. When the gas flow rate is 85 L/min,the filtration efficiency of the water electret material is only reduced by 0.93% and 0.95% after being loaded with salt and oil for 20 min,showing stable and excellent filtration performance.The filtration test results of the material after high and low temperature aging show that the charge decay of the water electret material is less affected by temperature.