Preparation of composite polypropylene flame retardant nonwovens and their properties
By adding halogen-free flame retardant ammonium polyphosphate(APP)into electrospinning solution,the flame retardant filtration performance of PP melt-spraying and PP/PAN@APP is studied.The results show that the filtration efficiency of PP/PAN@APP for 0.3 pm particles is about 98％,while that of PP melt-blown materials is only 41.504％.The addition of APP significantly improves the combustion performance of the composite material,with no drop during combustion and an increase in carbon formation.TG results show that the thermal properties of PP/PAN@APP are better than that of PP/PAN,and the amount of carbon residue is about 7 times that of PP/PAN.With the increase of APP mass fraction,the average fiber diameter of PAN@APP increases and is smaller than that of PP fiber.EDS analysis shows that the main elements N and P in APP are evenly distributed in nanofiber materials.
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