摘要：
In order to investigate pore size's distribution and change of aramid needle-punched felt with different needle-punched densities at different temperatures,using 100 ％ aramid 1313 fiber as raw material,aramid 1313 needle felts with five kinds of needle-punched densities were prepared by nonwoven acupuncture process.And the samples were treated at high temperature (100 °C,150 °C,200 °C,250 °C,treating time was 60 minutes) and then tested.The results show that with the increase of the needle-punched density,the pore size distribution becomes more and more concentrated and uniform.When the needle-punched density is 350 strokes/cm2,the pore size is the smallest,and the distribution is the most concentrated and the filtration effect is the best.Below 200 °C,with the increase of tem perature,the pore size distribution is highly concentrated,but the air permeability,pore size and distribution change little.When the treating temperature rises to 250 °C,the distribution is significantly dispersed,the pore size and the air permeability increases,which shows that the internal structure is damaged,and then the filter performance reduces obviously.%为探究芳纶针刺毡在不同温度下孔径的大小及分布变化情况,以100％芳纶1313纤维为原料,通过非织造针刺工艺,制备了5种不同针刺密度的针刺毡,对其进行高温处理(100°C,150°C,200°C,250°C),处理时间为60 min,并进行测试.结果表明,随着针刺密度增加,针刺毡的孔径分布越来越集中、均匀,当针刺密度为350刺/cm2时,孔径最小,分布最集中.当处理温度在200°C以下,5种芳纶针刺毡孔径分布集中,透气率、孔径大小及分布变化不大;当温度升高到250°C时,芳纶针刺毡的孔径分布显著分散,孔径增大,透气率增大,说明内部结构被破坏,其过滤性能显著下降.
