MoO3-ZrO2 solid acid for enhancement in the efficiency of intumescent flame retardant

To further improve the efficiency of intumescent flame retardant (IFR) system consisting of ammonium polyphosphate and charring-foaming agent, MoO3-ZrO2 solid acid is used as an adjuvant. The influence of MoO3-ZrO2 on the thermal decomposition, reaction to small flame and fire behavior of polypropyl...

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Bibliographic Details
Published in:Powder technology 2019-02, Vol.344, p.581-589
Main Authors: Chen, Xianfeng, Huang, Chuyuan, Shi, Yongqian, Yuan, Bihe, Sun, Yaru, Bai, Zhiman
Format: Article
Language:English
Subjects:
Acids
Ammonium
Carbon dioxide
Composite materials
Decomposition
Decomposition reactions
Fire protection
Fire safety
Flame retardants
Foaming
Foaming agents
Graphitization
Heat release rate
Heat transfer
Intumescent flame retardant
Molybdenum oxides
Molybdenum trioxide
Polymer matrix composites
Polypropylene
Solid acid
Synergism
Thermal decomposition
Zirconium dioxide
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Summary:To further improve the efficiency of intumescent flame retardant (IFR) system consisting of ammonium polyphosphate and charring-foaming agent, MoO3-ZrO2 solid acid is used as an adjuvant. The influence of MoO3-ZrO2 on the thermal decomposition, reaction to small flame and fire behavior of polypropylene (PP)/IFR composite is investigated. The incorporation of 1 wt% solid acid results in the enhanced limiting oxygen index (LOI) and fire safety of PP/IFR composite, while decreasing its peak heat release rate from 431 to 370 kW/m2. Flame retardant mechanism is proposed based on the analysis of thermal decomposition behavior and char residue. The yield and graphitization degree of char residue are improved by MoO3-ZrO2. The release of CO2 from thermal decomposition of IFR is accelerated by this solid acid. This work provides a new path to designing highly fire retardant polymer composites. [Display omitted] •The efficiency of IFR was enhanced by MoO3-ZrO2 solid acid.•Thermal stability and pyrolysis behavior were investigated by TGA and TG-IR.•Flame retardant mechanism of APP/CFA/MoO3-ZrO2 system was concluded.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2018.12.056