The Carbonization And Flame Retardancy Of Polypropylene In Presence Of Synergic Catalysts Of Hpw And Ni₂O₃

Polypropylene (PP) was widely used in many industries such as architecture,automobile, chemistry. But it's much difficult to reuse those large amont of wasted PP result from its rich carbon structure, which, On the other hand, also made PP easily flamous. The traditional ways to treat wasted PP were just incineration and bury,which may lead to waste of resource and pollution to environment. Based on those two point, firstly, a one-pot approach was used to prepared magnetic C/Ni/SiO2-x nanomaterials by catalytic carbonization of PP in presence of the combined catalysis of Ni2O3 and tungstophosphoric acid supported by SiO2 (HPW-SiO2) at 700?. The result showed the yield of magnetic C/Ni/SiO2-x nanomaterials from PP/10Ni2O3 mixtures largely depended on the content of HPW-SiO2 which had synergetic effect with Ni2O3 on the yield of carbon materials. The yield of C/Ni/SiO2-x nanomaterials increased with increasing of content of HPW-SiO2 and reached nearly 70 wt.% when addition of HPW-SiO2 was 10 wt.% in PP/10Ni2O3 mixtures. The obtained carbon materials mainly consisted of long multi-walled carbon nanotubes (MWCNTs) and lower amorphous carbon but short carbon nanotubes also presented at 10 wt.% Ni2O3 content. Finally, the magnetic C/Ni/SiO2-x nanomaterials was used to remove methylene blue (MB) from water, which supplied an potential application to treat wastewater for this carbon materials from waste plastics.PP/Ni2O3 and PP/Ni2O3/HPW-SiO2 composites were prepared by melt compounding with the HPW-SiO2 loading varied from 1, 3 and 5 wt% to investigate the effect of combined catalysts of Ni2O3 and HPW-SiO2 on yield residual char,thermal property, mechanical properties and, especially, flame retardancy of PP composites. By addition of Ni2O3 and HPW-SiO2 in PP matrix, not only the yield of residual char of PP composites were much increased, but also the thermal property and mechanical properties of PP composites were both significantly enhanced compared those of neat PP. And the flame retardancy of PP composites was also greatly improved with much lower heat release rate (HRR) peak heat release rate(PHRR), mass loss rate (MLR) and, it was worth to note, smoking production rate(SPR) than those of neat PP, especial for PP5Ni5 composite with lower than 100kW/m2 of HRR and near 0 m2/s of SPR after keeping stably combustion. The PP composites with good mechanical properties and excellent flame retardancy can be used as flame retardancy materials needing good mechanical properties.