以260~350 g/m2的芳纶无纺毡为基底层、40~60 g/m2的耐高温无纺布为保护层，通过静电喷雾将高温粘合剂均匀涂布在基底层上，再采用静电纺丝技术将直径150~400 nm的可溶性聚酰亚胺(P84)纳米纤维均匀纺制其上，附上保护层，热压固化使3层材料紧密结合，得到三明治结构的耐高温纳米纤维复合过滤毡，用其去除模拟气溶胶(粒径0.3~10 ?m的NaCl)颗粒. 结果表明，复合滤毡粘结强度超过1000 kPa，粘合剂对基底性能影响较小，少量纳米纤维可有效提高材料的过滤效率，对粒径2.0 ?m以上和1.0~2.0 ?m NaCl颗粒的过滤效率分别达100%和99.5%以上.

A composite felt with sandwiched structure was prepared by evenly depositing basis of 150~400 nm electrospun soluble polyimide (P84) nanofibers on substrates of aramid nonwoven fabrics of 260~350 g/m2. The substrates were pre-sprayed electrostatically with high-temperature adhesives to bind the nanofibers. Another protective layer made of high-temperature nonwovens with basis of 40~60 g/m2 was used to shield the nanofibers. The composite was then hot-pressed to gain the binding strength as the adhesives solidified, to remove the simulated dusts, 0.3~10 ?m NaCl aerosols. The results showed that the property of the substrate was less affected by the adhesive, and the composite had a strength higher than 1000 kPa. Even a small amount of P84 nanofibers can obviously enhanced the filtration efficiency. The filtration efficiency of the composite reached to 100% to the particles equal and greater than 2.0 ?m, 99.5% to the particles 1.0~2.0 ?m in diameter.