A new group of azo disperse dyes prepared by the Ugi four‐component reaction were used to dye polyurethane fibres. It was found that all the new dyes showed excellent fastness properties. One of the new dyes was selected to investigate the adsorption properties on polyurethane fibres, including the dyeing rate, adsorption isotherm, surface adsorption state, colour characteristics and colour fastness. The results were compared with those of CI Disperse Orange 3, which has the same parent structure as the new dye. The results indicated that the new dye has a lower dyeing rate and solubility but a higher affinity and adsorption capacity than the conventional dye due to its larger molecular weight and size. In addition, the aggregation of the new dye on the surface of polyurethane fibres occurred at higher concentrations whereas the conventional dyes aggregated at a lower concentration, resulting in lower colour fastness. This demonstrates that these new dyes derived from the Ugi four‐component reaction are worth developing further and are of great application value for polyurethane fibres.

中文翻译：

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四组分Ugi反应制备的新型偶氮分散染料在聚氨酯纤维上的染色性能

通过Ugi四组分反应制备的一组新的偶氮分散染料被用于对聚氨酯纤维进行染色。发现所有新染料均显示出优异的坚牢度性能。选择一种新的染料来研究聚氨酯纤维的吸附性能，包括染色速率，吸附等温线，表面吸附状态，颜色特性和色牢度。将结果与CI Disperse Orange 3（具有与新染料相同的母体结构）的结果进行了比较。结果表明，与传统染料相比，新染料具有较低的染色速率和溶解度，但由于分子量和尺寸较大，因此具有较高的亲和力和吸附能力。此外，新染料在聚氨酯纤维表面上的聚集发生在较高浓度下，而常规染料在较低浓度下发生聚集，导致色牢度降低。这表明这些源自Ugi四组分反应的新型染料值得进一步开发，并且对聚氨酯纤维具有重要的应用价值。