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The preparation of ZIF-67 and its synergistic effect on fire performance of intumescent flame retardant polypropylene

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Abstract

Herein, zeolite imidazolate frameworks-67 defined as ZIF-67 was prepared and confirmed. The obtained ZIF-67 was served as a synergist in intumescent flame-retarded polypropylene (PP) composites to improve the flame retardant efficiency and smoke suppression performance. The results of thermogravimetric analysis indicated that the residual char of IFR/ZIF-67 with the mass ratio of 95:5 greatly enhanced from 24.9 mass% for IFR to 63.5 mass%, and increased by 155.0%. It was ascribed the complexation effect of cobalt ion in ZIF-67 for IFR system. With the incorporation of 18 mass% IFR/ZIF-67, the PP/IFR/ZIF-67 samples (PP-4) achieved UL-94V-0 rating during vertical burning tests and the limiting oxygen index (LOI) value was as high as 31.1%. Compared with PP/IFR (PP-1) containing 18 mass% IFR, the peak heat release rate (peak-HRR), total heat release (THR), peak smoke production rate (peak-SPR) and total smoke production (TSP) of PP-4 were decreased by 33.1%, 33.8%, 31.0% and 21.1%, respectively. The char residue of PP-4 was as high as 27.4 mass% at the end of cone calorimeter test (CCT). The more expanded, sufficient and dense char layer were generated during combustion, and the flame retardancy and smoke suppression of PP-4 were significantly improved. Meanwhile, the pyrolysis gaseous products were inhibited to enter into combustion zone due to the isolation effect of the generated intumescent char layer. Consequently, the PP/IFR/ZIF-67 composites with excellent flame retardant performance and smoke suppression were obtained.

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Acknowledgments

This work was supported by Natural Science Foundation of China (Grant numbers 52073043 and 52173069), Fundamental Research Funds for the Central Universities (2572022CG03) and Key Research and Development Projects in Heilongjiang Province (GZ20210089).

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Authors and Affiliations

  1. Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, 150040, China

    Xuhui Yang, Siyu Jiang, Zhiyong Zhang, Bin Li & Miaojun Xu

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  1. Xuhui Yang
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  4. Bin Li
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Contributions

Xuhui Yang contributed to experiment, data curation, investigation and writing—original draft preparation. Siyu Jiang contributed to visualization and writing—review and editing. Zhiyong Zhang contributed to conceptualization, methodology, writing—review and editing. Bin Li contributed to methodology and supervision. Miaojun Xu contributed to conceptualization and resources.

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Correspondence to Zhiyong Zhang or Miaojun Xu.

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Yang, X., Jiang, S., Zhang, Z. et al. The preparation of ZIF-67 and its synergistic effect on fire performance of intumescent flame retardant polypropylene. J Therm Anal Calorim 148, 9547–9560 (2023). https://doi.org/10.1007/s10973-023-12316-9

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