Synergistic Flame Retardant Effect of Melamine Polyphosphate/Piperazine Pyrophosphate on Thermoplastic Dynamic Vulcanizate
The doseeffect relationship of the melamine polyphosphate/piperazine pyrophosphate(MPP/PAPP)intumescent system on the flame retardant and mechanical properties of thermoplastic dynamic vulcanizate(TPV)was investigated,revealing the synergistic effects of MPP and PAPP on the flame retardancy and reinforcing.The results show that the optimal synergistic flame retardant effect is achieved when the constant total mass fraction is 30%and the mass mixing ratios of MPP/PAPP is 3 ∶ 7.Compared to only relying on MPP or PAPP,the 9MPP/21PAPP/TPV composite has a higher limiting oxygen index(25.7%),a higher vertical combustion class(V-0)and the lowest peak heat release rate(149.9 kW/m2).Thermogravimetric analysis revealed that the synergistic interactions between MPP,PAPP and TPV in the 9MPP/21PAPP/TPV sample could significantly reduce the degradation rate of TPV matrix at high temperature and increase the carbon residue rate,showing excellent synergistic flame retardancy.In tensile properties,the tensile strength and elongation at break of 9MPP/21PAPP/TPV are higher than those of 30MPP/TPV and 30PAPP/TPV.
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