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Fabrication of Ni-doped synergistic intumescent flame-retarding silicone rubber system with superior flame retardancy and water resistance

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Abstract

Aimed at settling the bottleneck problems of low flame retardancy for silicone rubber (SR), a modified melamine polyphosphate (H-Ni@MPP) was successfully obtained by successively introducing Ni2+ and silicon resin via a facile approach. Simultaneously, expandable graphite (EG) was further taken advantage of improving the flame-retardant ability. Surprisingly, the highest flame retardancy of SR/H-Ni@MPP/EG composites could be achieved with 49.5% LOI value and UL-94 V-0 rating when the loading was 40 phr. Moreover, flame retardancy after water treatment was dramatically maintained, revealing that the water resistance of SR composites was enhanced. The effect of H-Ni@MPP/EG ratio on the flame retardancy of SR was systematically investigated. Based on the analysis for remnants, the effective flame-retarding mechanism of SR composites can be ascribed to the physical–chemical intumescence, graphitized char layer and Ni-catalyzed process. Therefore, this strategy has provided an effective route for realizing the goal in flame-retarding SR composites.

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Acknowledgements

This work was supported National Natural Science Foundation of China, China (grant number 52005050), Foundation of State Key Laboratory of Automotive Simulation and Control, China (grant number 20201105), Science and Technology Development Project of Jilin Province, China (grant number YDZJ202201ZYTS334) and Science and Technology Research Project of Education Department of Jilin Province, China (grant number JJKH20220679KJ).

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Authors and Affiliations

  1. School of Chemical Engineering, Changchun University of Technology, Changchun, 130012, People’s Republic of China

    Weihong Chai, Xinying Su, Yurou Xia, Chenchen Liao, Meihuan Gao, Yingge Li & Zaihang Zheng

  2. Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun, 130022, People’s Republic of China

    Zaihang Zheng

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  1. Weihong Chai
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  2. Xinying Su
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Chai, W., Su, X., Xia, Y. et al. Fabrication of Ni-doped synergistic intumescent flame-retarding silicone rubber system with superior flame retardancy and water resistance. J Therm Anal Calorim 148, 1827–1839 (2023). https://doi.org/10.1007/s10973-022-11865-9

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