Influence of ammonium octamolybdate on flame retardancy and smoke suppression of PVC matrix flame retardant composites

Jianlin Xu; Chengsi Li; Shibo Ren; Lei Niu; Qingwen Bai; Xiang Li

doi:10.1515/ipp-2022-0007

Artikel

Influence of ammonium octamolybdate on flame retardancy and smoke suppression of PVC matrix flame retardant composites

Jianlin Xu , Chengsi Li , Shibo Ren , Lei Niu , Qingwen Bai und Xiang Li

Veröffentlicht/Copyright: 1. Juni 2022

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Abstract

In order to improve the flame retardancy and smoke suppression of polyvinyl chloride (PVC), ammonium octamolybdate (AOM)/nano-antimony trioxide (nano-Sb₂O₃)/dioctyl Phthalate (DOP)/PVC composites were prepared by high energy ball milling and melt blending methods using AOM as the smoke suppressant. The effects of AOM on the flame retardancy and smoke suppression of the PVC composites were studied by means of vertical burning tests (UL-94), limiting oxygen index (LOI), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and cone calorimetry (CCT). The results showed that the flame retardancy of PVC composites containing AOM was improved, namely the UL-94 grade of the composites reached the V-0 grade and the LOI increased from 22.3% to 30.6%, whilst the heat release rate (HRR), total heat release (THR), smoke production rate (SPR), total smoke production (TSR) and smoke factor (SF) decreased significantly. In addition, AOM could promote the dehydrochlorination reaction of the PVC composites at lower temperature, resulting in more compact and continuous char residues. Therefore, AOM is an effective smoke suppressant and has a good synergistic flame retardant effect with nano-Sb₂O₃ in flame retardant PVC matrix composites.

Keywords: ammonium octamolybdate; flame retardancy; nano-Sb2O3; polyvinyl chloride; smoke suppression

Corresponding author: Jianlin Xu, College of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China; and State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, P. R. China, E-mail: ggdjlxu@sina.com

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 51761025

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The work was supported by the National Natural Science Foundation of China [No. 51761025].
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-01-26

Accepted: 2022-05-07

Published Online: 2022-06-01

Published in Print: 2022-07-26

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https://doi.org/10.1515/ipp-2022-0007

Schlagwörter für diesen Artikel

ammonium octamolybdate; flame retardancy; nano-Sb2O3; polyvinyl chloride; smoke suppression