聚四氟乙烯微孔膜/双组分熔喷材料复合空气滤材的制备与过滤性能

摘要

以聚四氟乙烯(PTFE)微孔膜作为过滤层,聚酯/聚丙烯(PET/PP)双组分熔喷材料作为支撑层,通过非织造热轧技术制备一种空气过滤器用PTFE微孔膜/(PET/PP)双组分熔喷材料复合滤材.讨论了复合滤材的制备工艺,并研究了过滤层(PTFE微孔膜)、支撑层(熔喷材料)和热轧工艺对复合滤材过滤性能的影响.结果表明:制备的复合滤材具有优良的过滤性能,随着双组分熔喷材料中聚丙烯(PP)纤维体积分数的增加,复合滤材的过滤阻力上升;复合滤材的过滤性能主要由PTFE微孔膜提供;热轧工艺对复合滤材的结构和过滤性能都有影响;当PET/PP双组分熔喷材料中PET纤维与PP纤维体积比为30/70、热辊温度为150℃、线速度为8 m/min、辊间压力为180 N/cm2时,复合滤材的滤效达到99.95％,滤阻为350 Pa.%A polytetrafluoroethylene (PTFE) membrane/polyethylene terephthalate/poly-propylene (PET/PP)bi-component melt-blown nonwoven composite filter is prepared.The PTFE membrane is set as the filter layer and the PET/PP bi-component melt-blown nonwoven material is set as the supportive layer.The manufacturing process of composite filter is discussed,and the effects of PTFE and PET/PP on the filtration properties of the composite filter are also studied.The results indicate that the prepared composite filter material by the hot calendering technique has good filtration properties,and the pressure drop of PTFE membrane/(PET/PP)bi-component melt-blown nonwoven composite filter increases with the increase of PP fiber volume fraction in melt-blown nonwovens;the filtration performance of composite filter material is attributed to the characteristics of PTFE membrane.The construction and filtration efficiency of composite filter material are also influenced by the hot calendering technique.The filtration efficiency of composite filter material can reach 99.95％,the pressure drop is 320 Pa as the volume ratio of PET/PP of 30/70,the temperature of 150 ℃,the linear velocity of 8 m/min and the pressure of 180 N/cm2.