Abstract:

In order to make filtering mask with nontoxicity,  harmless and high efficiency, composite filtering material  made by electrospun 6/chitosan (PA6/CS) nanofibers and polypropylene melt-blown nonwoven fabric has been prepared. The diameter of electrospun PA6/CS nanofiber was (0.088±0.01)μm. The influence of electrospun time on surface morphology, pore size, filtration efficiency, ventilation property and water vapor permeability were investigated. The results showed that the electrospun PA6/CS nanofibers can significantly improve filtration efficiency of polypropylene melt-blown nonwoven fabric. The filtration efficiency to NaCl aerosol of composite material electrospun for 90 min was increased to 99%, which was obviously higher than polypropylene melt-blown nonwoven fabric by about 29%. The pore size, filtration pressure and ventilation property of the composite material were decreased obviously with increasing electrospun time, but the water vapor permeability was not changed obviously.

Key words: electrospinning, polyamide 6, filtration properties, permeability