A series of new azo disperse dyes containing the urethane group were synthesized through the reaction between the hydroxyl group in coupling component of disperse dyes and p-toluene isocyanate. The structures of the new dyes were fully confirmed by ¹H NMR, ¹³C NMR, FT-IR, MS and Elemental analysis. Their characteristics for the visible-light absorption and color fastness on polyamide fibers were respectively measured and compared with those of the original dye. It was found that the new dyes exhibited hypsochromic effect, and had the nearly unchanged absorption half band and higher molar extinction coefficients, the fastness properties has been greatly improved, especially for the washing and sublimation fastness. The new dyes 2d and 2e containing double urethane groups possessed excellent fastness properties on polyamide fabrics. These two dyes for all the fastness tested, including water fastness, sublimation fastness, rubbing fastness and light fastness, had reached 4–5 and 5 rates. It was very clear that the introduction of urethane group and the increase of molecular weight can effectively improve the fastness of disperse dyes for the polyamide fibers.

通过分散染料偶合组分中的羟基与对甲苯异氰酸酯的反应，合成了一系列含有氨基甲酸酯基的偶氮分散染料。新染料的结构已通过¹ H NMR完全证实，¹³13 C NMR，FT-IR，MS和元素分析。分别测量了它们在聚酰胺纤维上的可见光吸收和色牢度特性，并与原始染料进行了比较。发现该新型染料表现出七色变色效果，具有几乎不变的吸收半带和较高的摩尔消光系数，牢度性能得到了很大的改善，特别是对于洗涤和升华牢度。含有双氨基甲酸酯基团的新型染料2d和2e在聚酰胺织物上具有出色的牢度性能。所测试的所有色牢度（包括耐水色牢度，升华色牢度，耐摩擦色牢度和耐光色牢度）的两种染料均达到4-5和5的比率。