双活性基团活性染料的耐碱性研究

为考察均三嗪和乙烯砜的双活性基团活性染料的耐碱性，以活性黄176为例，采用反相离子对高效液相色谱法，测定了一系列活性黄176的浓度随时间、温度、pH值等变化的实验数据，得出了活性黄176在不同条件下的水解关系曲线，并采用准一级反应动力学模型拟合实验数据．结果表明：在酸性介质（pH4．47）中，双活性基团染料活性黄176会水解，但温度升高时变化规律不明显；在中性介质（pH8．07）中，温度越高染料水解速度越快．并且两者在温度一定时染料水解反应基本服从准一级反应（R2〉0．982）．在碱性介质（pH10．3）中，温度升高活性黄176水解十分剧烈，并几乎严格按照准一级反应进行（R2〉0．992）．

Alkali--resistance Property of Double Active Group of Reactive Dyes

In order to investigate the alkali--resistance property of reactive dyes with double kinds of active groups, taking C. I. Reactive Yellow 176 for example, a series of hydrolysis test data in which the concentrations of the reactive dye varied with time, temperature and pH were determined by ion--pair reversed --phase high performance liquid chromatography （HPLC）. And then relationship curves of C. I. Reactive Yellow 176 hydrolysis at different conditions were obtained and pseudo--first--order kinetic model were used to evaluate the test data. The results indicated that the reactive dye could be hydrolyzed at pH 4. 47 but didn＇t show an obvious rule when the temperature rose. The hydrolysis velocity of the reactive dye increased at pH 8. 07 with temperature rising. But all those followed the pseudo--first--order kinetic model at fixed temperature （R2 〉0. 982）. The reactive dye hydrolysis was violent and it strictly followed the pseudo--first--order reaction at pH 10.3（R2〉0. 992）.