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Synthesis of silicic poly carbonyl urea and its flame-retardant effect on polypropylene for char forming

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Abstract

This paper researches the char forming and flame-retardant effect of silicic poly carbonyl urea (Si-PCU) in company with ammonium polyphosphate (APP) on polypropylene (PP). Si-PCU was firstly synthesized and represented by Fourier transform infrared spectroscopy, energy-dispersive analysis, thermogravimetric analysis and water contact angle. Then, the intumescent flame retardants, Si-PCU + APP, were added into PP. Their flame-retardant effects were studied by limiting oxygen index (LOI) test, UL-94 vertical burning and micro-combustion calorimetry (MCC). When the amount additions of PP, APP and Si-PCU were 70, 20 and 10%, the LOI value of these PP composites (PP-6) was reached 29.5 and UL-94 testing grade was V-0, besides the PHRR decreased 66% and THR decreased 34% compared with pure PP. Furthermore, the residual char layers’ microstructure and strength were researched by field-emission scanning electron microscope, wide-angle X-ray diffraction and laser Raman spectroscopy. They showed that PP-6’s char layer was denser and had higher strength than other PP composites. Finally, tensile tests illustrated that the addition of Si-PCU + APP could decrease the break strength and toughness of pure PP, but Si-PCU + APP/PP had better toughness than APP/PP.

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Acknowledgements

We thank the strong supports by the following: the Experiment Center of Polymer Science and Engineering Academy, Sichuan University.

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Authors and Affiliations

  1. Department of Polymer Science and Materials, The State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China

    Ying Ren, Linfei Wei, Wenmin Li, Dandan Yuan, Yunyun Yang & Xufu Cai

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  1. Ying Ren
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  2. Linfei Wei
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  3. Wenmin Li
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Correspondence to Xufu Cai.

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Ren, Y., Wei, L., Li, W. et al. Synthesis of silicic poly carbonyl urea and its flame-retardant effect on polypropylene for char forming. J Therm Anal Calorim 137, 1267–1277 (2019). https://doi.org/10.1007/s10973-019-08040-y

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  • DOI: https://doi.org/10.1007/s10973-019-08040-y

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