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FLAME-RETARDANT ACRYLIC YARN HAVING EXCELLENT DEVITRIFICATION RESISTANCE AND PRODUCTION THEREOF
FLAME-RETARDANT ACRYLIC YARN HAVING EXCELLENT DEVITRIFICATION RESISTANCE AND PRODUCTION THEREOF
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机译:具有出色的耐失偏性的阻燃丙烯酸腈纶纱及其生产
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摘要
PURPOSE:To obtain the title new yarn having excellent devitrification resistance by delivering spinning dope comprising a polymer composed of acrylonitrile, vinylidene chloride and sulfonic acid-containing monomer, etc., into a gas, introducing into a coagulating bath, primarily drawing yarn in hot water and secondarily drawing under dry heat. CONSTITUTION:A polymer composed of 45-66wt.% acrylonitrile, 30-50wt.% vinylidene chloride, 0.5-4wt.% sulfonic acid-containing monomer (e.g. allylsulfonic acid) and 0-8wt.% another monomer [e.g. (meth)acrylic acid] copolymerizable with these monomers is dissolved in an organic solvent (e.g. DMF) to give spinning dope, which is delivered from a spinneret into a non-coagulating gas and introduced into a coagulating bath having 40-60% organic solvent concentration to form yarn. Then the yarn is primarily drawn in hot water at 60-100 deg.C at = twice draw ratio, the solvent is removed and the yarn is secondarily drawn under dry heat at =2.5 times draw ratio to give the objective yarn having =60% light transmittance after boiling water treatment, etc.
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