화학공학소재연구정보센터
Polymer Bulletin, Vol.77, No.8, 4307-4324, 2020
Effect of hollow glass microsphere on the flame retardancy and combustion behavior of intumescent flame retardant polypropylene composites
Nowadays, increasing the fire safety of polypropylene (PP) is an important research direction. In this article, the investigation mainly focuses on the effect of hollow glass microsphere (HGM) on improving the fire safety of PP/intumescent flame retardants (IFR) composites. The flame retardancy, smoke suppression and thermal stability of PP/IFR/HGM system were studied by limiting oxygen index (LOI), vertical burning (UL-94), cone calorimeter tests (CCT) and thermogravimetric analysis. All the results demonstrated that the incorporation of HGM into PP/IFR system can clearly improve the fire safety of PP/IFR materials. The result of the LOI can be as high as 36.5% with only 1 wt% HGM and 24 wt% IFR addition. Scanning electron microscope-energy-dispersive spectrometer (SEM-EDS) and CCT results illustrated that during the combustion, HGM would migrate onto the surface of the sample to form a compact char layer and prevent further combustion of the material. Furthermore, the CCT results indicated that HGM can slow down the peak heat release rate (from 94.9 to 61.6 kW/m(2)) and make the total smoke release (TSR) decrease from 1210 m(2)/m(2)(PP/IFR) to 544 m(2)/m(2)(PP/IFR/HGM), reduced by 55.0%. In addition, HGM can improve the thermal stability of PP/IFR systems.