酸性染料による絹の染色に及ぼす尿素の影響

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タイトル別名
  • Effect of urea on the acid dyeing of silk.
  • サンセイ センリョウ ニ ヨル キヌ ノ センショク ニ オヨボス ニョウソ

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The effect of urea addition on the dyeing of silk with acid dyes was investigated. Five acid dyes were used at constant pH's (4 or 5) and temperatures (30°C or 50°C).<br>In some cases, urea addition results in the increase in the dyeing rate. The reverse was observed in other cases. Silk did not swell by urea addition. Therefore in an acid dye-silk system, it is concluded that two mechanisms control the effect of urea addition, <br>1) urea disaggregates the dyes in an aqueous solution.<br>2) urea weakens the binding between the dye and silk.<br>Dyes that are easily dissolved in water are in the monomolecular state, and the second mechanism of urea addition can be advocated. As the dye becomes more hydrophobic, the two mechanisms operate. Then former mechanism is effective in the adsorption of dye on silk, hence the dyeing rate is increased by addition of urea. However a certain degree of disaggregation is necessary for the increase of the dyeing rate. If the concentration of urea is too high, the dyeing rate tends to decrease.

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