Study on preparation and application comfort of composite personal protective nanofiber filter material for mining

Miner's pneumoconios is a serious global public health problem. To further improve the application performance of individual protective materials, this paper prepared three-layered composite filter material composed of a hydrophobic external layer, a dust filter intermediate layer, and a moisture permeable internal layer, and explored the influence of composite ratio on the comprehensive performance of the filter material. The thermal comfort evaluation index system under complex working conditions environment was established. The results show that the optimal composite ratio of composite filter material is 2/6/2. This optimal composite filter material has dual-structure with high filtration efficiency of 99.9 %, low resistance of 98.7Pa, high quality factor of 0.07 and high air permeability of 364 mm/s. The construction of the wetting gradient realizes the efficient moisture permeability of 11.1 kg·m−1·d−1of the filter media. In addition, it shows the antibacterial activity of over 90 % against S.aureus and E.coli. The ergonomics experiments shows the heart rate and oxygen uptake are the key influencing factors reflecting the thermal comfort of the filter material. The composite filter material developed with excellent air and moisture permeability can provide a comfortable and safe breathing environment under the working environment of high temperature, high humidity and high labor intensity.