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Chitosan-regulated inorganic oxyacid salt flame retardants: preparation and application in PVC composites

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Abstract

A series of chitosan-modified inorganic oxyacid salt flame retardants (IOS-CS) were synthesized and used as flame retardants to improve the fire resistance of poly(vinyl chloride) (PVC) composites while improving the mechanical properties of the materials. The thermal stability of the material was analyzed by TG test; the flame-retardant and smoke suppression properties were evaluated by limiting oxygen index (LOI) and cone calorimeter test, and the mechanical properties were analyzed by tensile test and impact test. The TG results showed that the addition of flame retardant can promote the early cross-linking decomposition of PVC composites, not only advance the decomposition temperature of the material but also promote the formation of char layer and increase the char residual content. LOI and cone calorimeter test results showed that stannate chitosan (Sn-CS) can improve flame retardant and smoke suppression more effectively than other samples. Compared with pure PVC, the addition of Sn-CS increased its LOI from 26.6 to 30.5% and reduced the total heat release value and total smoke release by 18.23% and 52.55%, respectively. At the same time, the addition of the flame retardants had no large deterioration effect on the mechanical properties of the material. The tensile properties of flame-retardant PVC were slightly reduced compared with pure PVC, and the impact resistance was even improved to some extent.

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Acknowledgements

This work was supported by the Higher Education Science and Technology Research Project of Hebei Province [Grant Number ZD2018011]; the Key Basic Research Project of Hebei Province [Grant Number 16961402D]; and the Key Research Project of Hebei Province [Grant Number 19211205D].

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Authors and Affiliations

  1. Engineering Technology Research Center for Flame Retardant Materials and Processing Technology of Hebei Province, Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, People’s Republic of China

    Qingyi Song, Hao Liu, Tian Wang, Weihua Meng & Hongqiang Qu

  2. Department of Foundation Couses, Agricultural University of Hebei, Cangzhou, 061100, People’s Republic of China

    Hongjuan Wu

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  1. Qingyi Song
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  2. Hongjuan Wu
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  3. Hao Liu
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Correspondence to Hongqiang Qu.

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Song, Q., Wu, H., Liu, H. et al. Chitosan-regulated inorganic oxyacid salt flame retardants: preparation and application in PVC composites. J Therm Anal Calorim 146, 1629–1639 (2021). https://doi.org/10.1007/s10973-020-10170-7

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  • DOI: https://doi.org/10.1007/s10973-020-10170-7

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