Fabrication of hydrotalcite containing N/P/S and its ternary synergistic efficiency on thermostability and fire resistance of ethylene vinyl acetate (EVA): Fabrication of N/P/S-HTC and synergistic effect to EVA/IFR composite
作者：Xiaoyu Gu, Wenxiang Sun, Jia Guo, Xiangxing Bu, Hongfei Li, Sheng Zhang*, Jun Sun*
關鍵字：hydrotalcite, synergistic, flame retardant
論文來源：期刊
具體來源：Journal of Vinyl & Additive Technology, DOI: 10.1002/vnl.21684
發(fā)表時間：2018年
Nitrate intercalated hydrotalcite (NO3?‐HTC) was first prepared as precursor; a schiff base derivative containing N, P, and S was synthesized and its structure was characterized. Later the schiff base derivative was used as intercalation to replace NO3? in hydrotalcite. The final product was schiff base derivative intercalated hydrotalcite, which was named as benzaldehyde–taurine–hypophosphorous (BTP)‐HTC. The results showed both NO3?‐HTC and BTP‐HTC can effectively improve the flame retardant and thermostability of ethylene vinyl acetate (EVA). In cone calorimeter test, the peak heat release rate of EVA was 1421.2 kW/m2 and reduced sharply to 746.1/584.5 kW/m2 for 20 wt% NO3?‐HTC/BTP‐HTC adding, respectively. At same time, the total heat release was also decreased from 120.6 MJ/m2 for EVA to 81.0/70.0 MJ/m2, respectively. Morphology observation and composition analysis by scanning electron microscopy (SEM)/X‐ray spectroscopy (EDS) documented the residue left after combustion of EVA/NO3?‐HTC was just ash containing Mg and Al; but for EVA/BTP‐HTC, coherent char layer containing Mg, Al, and P was left. Thermogravimetric analysis indicated that the thermal degradation of EVA was prolonged by either NO3?‐HTC or BTP‐HTC; and char content was kept to 8.6% and 11.0%, respectively. The whole results documented either NO3?‐HTC or BTP‐HTC improved the combustion behavior and thermostability of EVA, and BTP‐HTC showed excellent effect.