Effect of metal salts on the dyeing of freshly spun polyacrylonitrile fibre with acid dyes

Effect of some metal salt pretreatments on acrylic printing

“…The increase in the color strength with metal ions could be attributed to the interaction mechanism between the metallic cations and the fiber, 6 which impaired the well-ordered structure of the fiber and thus loosened the fiber structure (increasing the amorphous parts). Subsequently, the color uptake also increased.…”

“…[1][2][3] Usually, basic dyes have high shade brilliance but poor light fastness, and acrylic fibers containing acidic dye sites can be readily dyed with classical basic dyes, which have surprisingly high lightness and wash fastness in comparison with the same dyes on natural fibers. 4 The pickup of an acid dye by as-spun acrylic fibers through the addition of Al 3ϩ , Zn 2ϩ , or Cr 3ϩ ions to a bath was established by Abdurakhmanova et al 5 They also examined the sorption of acid dyes by acrylic fibers, and the interaction mechanism between metallic cations and fibers was examined with IR, 6 which confirmed the orientation of fabric molecules such as CN side groups or CO side groups in PAN and PAN copolymers.…”