Method of Obtaining of Fire Resistant Polyacrylonitrile Fiber or Cloth from It

摘要

Is known the method of obtaining the fire resistant polyacrylonitrile fiber by heating to 200 C; however, in this case fiber with the low strength characteristics is obtained. Is proposed the method of obtaining of fire resistant polyacrylonitrile fiber or cloth from it, according to which polyacrylonitrile fiber is subjected to in stages hot working, heating initially at 200 C during 25-30 h. They further raise temperature to 200 C with a velocity of 1.5-2.0 in 1 min. After reaching 300 C they raise temperature to 400-475 during 15-25 min. In this case fire resistant material with good mechanical properties is obtained. The processed polyacrylonitrile cloth is not ignited in the flame of burner and has the following strength characteristics: weight 1 sq. m.-200 g; strength on base 38-45 rkm, on the weft 30-35 rkm; elongation on the base and on weft 4-5%. (Russian translations).