2018年

Fabrication of hydrotalcite containing N/P/S and its ternary synergistic efficiency on thermostability and fire resistance of ethylene vinyl acetate (EVA)

发文时间:2020-03-08

Xiaoyu Gu, Wenxiang Sun, Jia Guo, Xiangxing Bu, Hongfei Li, Sheng Zhang*, Jun Sun*. Fabrication of hydrotalcite containing N/P/S and its ternary synergistic efficiency on thermostability and fire resistance of ethylene vinyl acetate (EVA). Journal of Vinyl & Additive Technology. 2018. DOI: 10.1002/vnl.21684. IF1.13

 https://doi.org/10.1002/vnl.21684

Abstract

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 ****ysis 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 ****ysis 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. J. VINYL ADDIT. TECHNOL., 25:255–261, 2019. © 2018 Society of Plastics Engineers