Abstract:

In order to improve the indoor air puality, polypropylene (PAN) nanofibers were coated on conventional glass-fiber screen by electrospinning to prepare anti PM 2.5  window screen. The influence of spinning solution concentration and base material of the window screen on the microstructure of the electrospun nanofibers were studied, and the anti PM 2.5 effect, transparent and air permeability of the window screen were also investigated. The results show that when the concentration of PAN spinning solution is 10 %, the voltage is 20 kV and the time is 0.5 h, the well-distributed nanofibers with mean diameters of 170 nm can be formed. On the window screen surface, the PAN films are deposited on the warp and weft yarn with a thickness greater than those deposited on the gap of the window screen. This structure improved the connected force of the nanofiber film with the window screen and the permeability of the window screen. However, the transparency of the wondow screen decreases by 12% and air permeability decreases by 35% due to the deposition of PAN nanofibers. With the increasing of PM2.5 testing time, the adsorption effect is increased. Some organic functional groups are adsorbed on the screen surface. Then the indoor air quality became better. After 2 h testing, the rejection ratio of PM2.5 reaches 63%. With the increasing of PM2.5 adsorption, the transparency and air permeability of the window screendecrease correspondingly.

Key words: polyacrylonitrile nanofiber, air filtering, anti PM2.5 window screen, electrospinning