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Flame-retardant rigid polyurethane foams prepared with amorphous sodium polyborate

Authors

  • Isao Tsuyumoto,

    Corresponding author
    1. Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, Applied Chemistry, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan
    • Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, Applied Chemistry, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan
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  • Yasutoshi Onoda,

    1. Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, Applied Chemistry, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan
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  • Fumiya Hashizume,

    1. Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, Applied Chemistry, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan
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  • Eisuke Kinpara

    1. Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, Applied Chemistry, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan
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Abstract

Highly flame-retardant rigid polyurethane (RPU) foams were prepared by vacuum impregnation or pressure impregnation of sodium polyborate (SPB) solution. The RPU foams (10 mm thickness, 134–690% SPB) endured the flame of a butane gas burner for 167–1144 s, and the backside temperatures remained below 45°C until penetration occurred. The heat releases from the RPU foams with 150 and 400% SPB in air in the cone calorimeter tests were 8.8 and 4.1 MJ/m2, respectively. The analyses with thermogravimetry, differential scanning calorimetry, and scanning electron microscopy indicated the flame-retardant mechanism, in which the SPB foam and the formed char layer together insulated the inside from oxygen gas and heat. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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