Flame retardancy in fabric consisting of cellulosic fiber and modacrylic fiber containing fine‐grained MoO3 particles |
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| Authors: | Takeshi Tanaka Osamu Terakado Masahiro Hirasawa |
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| Affiliation: | 1. Kanekalon Fibers R & D Group, Technology Management Department, Kanekalon Division, KANEKA CORPORATION, Takasago, Hyogo, Japan;2. Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Japan;3. Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Japan |
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| Abstract: | Flame retardancy of fabrics consisting of modacrylic fiber containing with various dispersed metal compounds and cellulosic fiber has been investigated by means of flame test (ISO15025 procedure A) and limiting oxygen index (LOI). It has been found that excellent flame retardancy is achieved by fine‐grained MoO3 particles. The afterflame time in flame test and the LOI value are improved with decreasing particle size of MoO3. The flame retardancy of MoO3 (particle size; 0.1 µm) is comparable to that of Sb2O3. On the other hand, significant improvement in flame retardancy is not observed for other metal compounds although some metal oxides and a hydroxide in the present study are known as flame retardant or smoke suppressing agent in halogen containing polymer in previous studies. In order to clarify the mechanism of the observed flame retardancy by the addition of fine‐grained MoO3, we have carried out X‐ray fluorescence spectrometry (XRF) measurement of the fabric specimen after the flame test and thermogravimetric analysis (TGA) of various types of samples. These analytical data indicated that MoO3 works as halogen synergist in solid phase and the char of modacrylic fiber formed by addition of MoO3 suppresses decomposition of the cotton blended in the fabric in the range of the ignition temperature. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | modacrylic fiber MoO3 fine grained fabric specimen |
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