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Flame-retardant polyurethane elastomer based on aluminum salt of monomethylphosphinate

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Abstract

The flame retardancy of polyurethane (PU) elastomer based on aluminum monomethylphosphinate (MeP-Al) was investigated. Thermal analysis, evolved gas analysis (TG-FTIR), flammability tests (LOI, UL 94), heat release rate (HRR) (microcombustion calorimeter), and chemical analysis of residues (SEM–EDX and FTIR) were used to investigate the flame-retardant performance and mechanism of the PU/MeP-Al. Results show that adding MeP-Al endows PU desired flame retardancy and anti-dripping property. The sample containing 20 mass% of MeP-Al passes the UL 94 V0 rating with LOI value of 29.6% and no dripping during combustion. Moreover, the heat release during combustion and the amount of organic volatile from PU decomposition are significantly reduced. The good flame retardancy, anti-dripping property, dramatically a reduction in release of heat and organic compounds are attributed to the efficient action of the MeP-Al in both the gas and condensed phase. In the gas phase, the MeP-Al decomposes into monomethylphosphinic acid to inhibit flame and reduces the heat release. In the condensed phase, MeP-Al turns into the tough aluminum pyrophosphonate and promotes PU to form stable carbonaceous char by interacting with PU.

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Acknowledgements

This work is supported by the national high-tech R&D program of China (863 program) (2016YFB0401505).

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Authors and Affiliations

  1. Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan, 430056, China

    Quan Hu, Liyong Zou, Zhihong Liu, Jia Chen, Jiyan Liu & Xueqing Liu

  2. Flexible Display Materials and Technology Co-innovation Center of Hubei Province, Jianghan University, Wuhan, 430056, China

    Jia Chen, Jiyan Liu & Xueqing Liu

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  1. Quan Hu
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  2. Liyong Zou
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  3. Zhihong Liu
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  4. Jia Chen
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Correspondence to Jiyan Liu or Xueqing Liu.

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Hu, Q., Zou, L., Liu, Z. et al. Flame-retardant polyurethane elastomer based on aluminum salt of monomethylphosphinate. J Therm Anal Calorim 143, 2953–2961 (2021). https://doi.org/10.1007/s10973-020-09480-7

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