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Effect of char-forming agents rich in tertiary carbon on flame retardant properties of polypropylene

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Abstract

In this research, a novel type of triazine-based char-forming agent (PTPA) was synthesized and combined with ammonium polyphosphate (APP) to form an intumescent flame retardant (IFR) system to prevent polypropylene (PP) burning. A commercialized char-forming agent was purchased and the same process was used to study its flame retardant performance on polypropylene, and the results were compared with those of this experiment. It was found that the PP/IFR samples in this experiment (APP/PTPA = 4/1–1/1) reached the increased limiting oxygen index (LOI) value of 29.5%, and passed the vertical combustion (UL-94) V-0 rating. The maximum LOI for the purchase of char-forming agent is 31.0%. Thermogravimetric analysis results show that the PTPA/APP system can improve the thermal stability and thermal oxidation stability of carbon slag. The carbon residue was further studied by visual observation and scanning electron microscopy. The dense coke residues formed hinder the transfer of gas and heat during the combustion process, and ultimately endow the PP/IFR system with higher flame retardancy.

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Acknowledgements

The authors are grateful to National Natural Science Foundation of China (No. 21376031) and Hunan Provincial Natural Science Foundation of China (No. 2019JJ40294) for financial support.

Funding

This work was funded by National Natural Science Foundation of China (No. 21376031) and Hunan Provincial Natural Science Foundation of China (No. 2019JJ40294).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Changsha University of Science & Technology, No.960, South Wanjiali Road, Changsha, 410114, China

    Xiao-Shuang Tian, Yue-Fei Zhang, Yan Li & Jin-Rong Zhong

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  1. Xiao-Shuang Tian
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  2. Yue-Fei Zhang
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  3. Yan Li
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  4. Jin-Rong Zhong
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Contributions

Xiao-Shuang Tian: implementation of experimental and manuscript preparation; Yue-Fei Zhang: methodology, resources, writing—review & editing, supervision, funding acquisition; Yan Li: writing—review & editing, assistance for supervision; Jin-Rong Zhong: investigation, data processing, drawing.

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Correspondence to Yue-Fei Zhang.

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Tian, XS., Zhang, YF., Li, Y. et al. Effect of char-forming agents rich in tertiary carbon on flame retardant properties of polypropylene. J Therm Anal Calorim 147, 10391–10401 (2022). https://doi.org/10.1007/s10973-022-11299-3

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