Flame-resistance treatments for silk fabrics using several inorganic compounds.

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  • 無機化合物による絹の難燃加工
  • ムキ カゴウブツ ニ ヨル キヌ ノ ナンネン カコウ

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Silk fabrics were treated with several inorganic compounds in order to improve their flame resistance. Flammability was estimated by O. I. (Limiting Oxygen Index). It was observed that stannic chloride and bromide, phosphorus acid and bromic acid/borax were excellent retardants. Especially, O. I. of tin-weighted silk rose to 30, with a value of above 28 after 10 time laundering (O. I. of untreated silk was 23).<br>The mechanism of action of the flame retardants was investigated by thermogravimetric analysis (TG). Based on the TG curves obtained the compounds were divided into two groups, that is, phosphorus acid and boric acid/borax enhanced the rate of decomposition of silk at a lower temperature, and stannic chloride and bromide retarded the rate of mass loss upon heating. Studies on tin-weighting of silk fabrics had indicated that stannic chloride adsorbed onto silk fabrics was chemically changed to stannic oxide by hydrolysis after washing, and stannic oxide was not decomposed upon heating (600°C) based on the TG curve. Therefore, it was considered that stannic oxide adsorbed onto silk fabrics prevented the transmission of a flame.

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