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Flame-retardant and thermal properties of highly efficient water-resistant intumescent flame-retardant polypropylene composites

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Abstract

The more efficient and hydrophobic modificated ammonium polyphosphate (M-APP) and charring agent (M-CA) were prepared based on sol–gel method, and they were used in the preparation of water-resistant and flame-retardant polypropylene (PP) composites. The results showed that the contact angles of M-APP and M-CA were 135.11° and 137.89°, respectively. The flame-retardant and thermal properties of the PP composites were also studied. The results showed that the flame retardancy of PP loaded with 30 mass% intumescent flame retardant (M-APP/M-CA = 3:1) was significantly increased. The limiting oxygen index (LOI) reached 36.8% and passed UL-94 V-0. The peak heat release rate and total heat release of the PP composite decreased from 1011.77 to 134.43 kW·m−2 and 100.58 to 6.86 MJ·m−2, respectively. The peak smoke production rate and total smoke release decreased from 0.13 to 0.0056 m2·s−1 and 1453.09 to 74.82 m2·m−2. The PP composite with M-APP/M-CA = 3:1 also exhibited excellent water resistance, and it could still reach UL-94 V-0 after soaking in 70 ℃ water for 168 h.

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Acknowledgements

The authors deeply appreciate the Provincial Natural Science Foundation of Anhui (1908085J20, 2008085QE269), the National Natural Science Foundation of China (No. 51775001), the University Synergy Innovation Program of Anhui Province (GXXT-2019-027, GXXT-2020-079), Post-graduate’s Innovation Fund Project of Anhui University of Science and Technology (NO.2020CX2016), Natural Science Research Project of Universities in Anhui Province (KJ2020A0326) and Leading Talents Project in Colleges and Universities of Anhui Province.

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Authors and Affiliations

  1. School of Safety Science and Engineering, Anhui University of Science and Technology, 232001, Huainan, Anhui, China

    Wei Yang, Xiang Dong, Shi-bin Nie, Xiang-feng Zhang, Xue-qiang Wu, Cheng-ye Fang & Hai-lin Su

  2. School of Material Science and Engineering, Anhui University of Science and Technology, 232001, Anhui, Huainan, China

    Ji-nian Yang

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  1. Wei Yang
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Contributions

Wei Yang contributed to experiment, data curation, investigation and writing—original draft preparation. Xiang Dong contributed to visualization and writing—review and editing. Shi-bin Nie contributed to conceptualization, methodology, writing—review and editing and supervision. Ji-nian Yang contributed to conceptualization and methodology. Xiang-feng Zhang contributed to methodology and formal analysis. Xue-qiang Wu carried out measurements and contributed to formal analysis. Cheng-ye Fang carried out measurements. Hai-lin Su contributed to validation.

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Correspondence to Xiang Dong or Shi-bin Nie.

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Yang, W., Dong, X., Nie, Sb. et al. Flame-retardant and thermal properties of highly efficient water-resistant intumescent flame-retardant polypropylene composites. J Therm Anal Calorim 147, 7323–7336 (2022). https://doi.org/10.1007/s10973-021-11038-0

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