C.I.活性黑5低温水解性能分析

为研究并有效控制活性染料在冷轧堆染色中的水解，应用高效液相色谱（HPLC）对双乙烯砜型活性染料C.I.活性黑5在低温下的水解性能进行定性及定量分析。结果表明：在碱性缓冲液中，C.I.活性黑5的消除反应及水解反应为假一级反应，在其消除反应速率及水解反应速率均随着缓冲液pH值增加而显著提高；在30℃、pH值为9时，C.I.活性黑5的水解速率为3.5×10-5/min-1；相同温度下，在pH值10、11、12时该染料的水解反应速率常数分别是pH值为9时的3、27、233倍，因此，C.I.活性黑5在冷轧堆染色时，在 pH值为9～10的缓冲液中水解稳定性较好。

Hydrolysis performance of C.I. Reactive Black 5 at low-temperature

For the purpose of investigating the hydrolysis performance of bifunctional vinylsulfone reactive dyes in cold pad-bath dyeing,the high performance liquid chromatography was applied to analyze the process of hydrolysis of C.I.Reactive Black 5 qualitatively and quantitatively at low-temperature.The results showed that the rate of elimination reaction and hydrolysis reaction increases with the increase of pH value.In the alkaline solution,both of the reactins are of pseudo first-order.When the temperature is ...