Dyeing of Silk with Mononicotinic Acid Triazine Reactive Dyes

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  • Kato Hiroshi
    Insect Biotechnology and Sericology Department, National Institute of Agrobiological Sciences
  • Hata Tamako
    Insect Biotechnology and Sericology Department, National Institute of Agrobiological Sciences

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Mori silk and a wild silk were dyed with mononicotinic acid triazine reactive dyes, which were high temperature neutral-fixing dyes, and the following results were obtained; 1. The dye absorption and fixing ratio were best in a neutral bath of pH 6.5-7.5. 2. When a mori silk was dyed at the boiling temperature in a bath containing 60-80g/l of anhydrous sodium sulphate, the absorption and fixing ratio were both higher than 80%, which was about the same level of dyeability as with vinyl sulphone type reactive dyes (Ogawa, 1977). The results suggested that mononicotinic acid triazine reactive dyes could be used for dyeing mori silk. 3. The wild silk gave about half the dye absorption and fixing ratio as mori silk, suggesting that these reactive dyes were not practically suitable for dyeing wild silks. 4. The addition of a nonionic surfactant in the dye bath slightly improved the dye absorption by wild silk, because the surfactant promoted the penetration of the dye to the interior of the fibres. 5. The mononicotinic acid triazine reactive dyes did not give a complete sericin fixing effect, unlike dichlorotriazine-based reactive dyes. But mononicotinic acid triazine reactive dyes appeared to be suited for dyeing half-degummed mori silk.

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