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Comparative study on synergistic effect of LDH and zirconium phosphate with aluminum trihydroxide on flame retardancy of EVA composites

Journal of Thermal Analysis and Calorimetry volume 121, pages 619–626 (2015)Cite this article

Abstract

Flame-retardant ethylene vinyl acetate (EVA) composite based on aluminum trihydroxide (ATH), layered double hydroxide (LDH) and organo-modified zirconium phosphate (mZrP) were prepared by melt-compounding method. The synergistic effect of LDH and mZrP with ATH on the fire behavior and thermal stability of EVA composites was studied by limiting oxygen index, UL-94 test, cone calorimeter and thermogravimetric analysis. EVA composite with ATH and LDH passed the V-0 rating while EVA composite with ATH and mZrP exhibited relatively low peak heat release rate. EVA/ATH composite with 10 mass% LDH exhibited a char yield of 34 % at 700 °C, while its counterpart with 10 mass% mZrP showed 29 %, indicating LDH possessed superior flame-retardant synergistic efficiency with ATH over mZrP in terms of promoting char formation. Regarding the heat release rate (HRR), EVA/ATH composite with 10 mass% mZrP displayed a 73 % reduction in PHRR, whereas its counterpart with the equivalent loading of LDH showed a lower flame-retardant synergistic efficiency (a 58 % reduction in peak HRR). The results above demonstrated that LDH mainly functioned as catalyst in char formation, while mZrP was beneficial to restraining heat release.

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Acknowledgements

This research is partly funded by the European Commission under the 7th Framework Programme (Marie Curie Career Integration Grant), European Project COST Action MP1105 “FLARETEX”, and Ramón y Cajal Grant (RYC-2012-10737).

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Authors and Affiliations

  1. IMDEA Materials Institute, C/Eric Kandel, 2, 28906, Getafe, Madrid, Spain

    Ehsan Naderi Kalali, Sergio De Juan, Xin Wang & De-Yi Wang

  2. School of Energy Resources and Safety, Anhui University of Science and Technology, Huainan, 232001, Anhui, China

    Shibin Nie

  3. School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing, 100029, China

    Rui Wang

Authors
  1. Ehsan Naderi Kalali
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  2. Sergio De Juan
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  3. Xin Wang
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  4. Shibin Nie
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  5. Rui Wang
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  6. De-Yi Wang
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Correspondence to De-Yi Wang.

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Kalali, E.N., De Juan, S., Wang, X. et al. Comparative study on synergistic effect of LDH and zirconium phosphate with aluminum trihydroxide on flame retardancy of EVA composites. J Therm Anal Calorim 121, 619–626 (2015). https://doi.org/10.1007/s10973-015-4598-9

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  • DOI: https://doi.org/10.1007/s10973-015-4598-9

Keywords

  • Flame retardancy
  • Ethylene vinyl acetate (EVA)
  • Synergistic effect
  • Halogen free