manufacturing process of fiber self bouclantes composities improved based on polyacrylonitrile (pan)

摘要

1434160 Polyacrylonitrile composite fibres BAYER AG 4 Oct 1974 [9 Oct 1973] 43097/74 Heading B5B Polyacrylonitrile composite fibres are made by dry-spinning two different polyaorylonitrile polymers in side-by-side arrangement from dimethyl formamide solution, stretching the fibre to at least three times its original length in hot water containing 12 to 30% dimethyl formamide, and drying under tension or partial shrinkage. The stretching may be carried out in one or two stages, and the fibres may be passed through a further bath of hot water containing 12 to 20% dimethyl formamide either after stretching or between the stretching stages. The two polymers may be in the ratio from 50 : 50 to 35 : 65 and contain at least 85% acrylonitrile. Other comonomers may be, e.g. methyl acrylate, methylacroylaminobenzenebenzenedisulphonimide, or sodium methallylsulphonate.