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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0.3~10μm的Na Cl)颗粒.结果表明,复合滤毡粘结强度超过1000 k Pa,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2.0μm以上和1.0~2.0μm Na Cl颗粒的过滤效率分别达100%和99.5%以上.
With 260 ~ 350 g / m2 Kevlar non-woven mat as the base layer, 40 ~ 60 g / m2 of high temperature non-woven fabric as a protective layer, the high temperature adhesive by electrostatic spray evenly coated on the base layer, and then An electrospinning technique is used to uniformly spin soluble polyimide (P84) nanofibers with a diameter of 150-400 nm. A protective layer is attached thereto, and the three layers of material are tightly bonded by hot pressing to obtain a sandwich structure of high temperature resistant nanometer Fiber composite filter felt, the simulated aerosol (Na Cl particle size 0.3 ~ 10μm) was used to remove the particles.The results showed that the bonding strength of the composite felt exceeded 1000 kPa, the adhesive had little effect on the substrate performance, and a small amount of nanofiber Which can effectively improve the filtration efficiency of the material. The filtration efficiencies of Na Cl particles with particle sizes of 2.0 μm and 1.0-2.0 μm are respectively over 100% and 99.5%.