A self-dispersing pigment was produced by a diazonium coupling reaction; the pigment reacted with aromatic diazonium salts which were generated by the reaction of p-aminobenzene sulfonic acid and sodium nitrite. The surface of the pigment particles was negatively charged due to sulfonic acid groups on the pigment surface. The pigment particle size and zeta potential were, respectively, 134.5 nm and −45.4 mV at neutral pH. The wool surface was positively charged by adjusting the pH; then the anionic self-dispersing pigment dyed the cationic wool. The results show that self-dispersing pigment can adhere well without a binder, and that the K/S value is closely related to pH, dyeing time, and the amount of pigment. The color fastness of the wool was good and the light fastness of the wool was grade 5, which is better than acid dyes. Self-dispersing pigments are potential candidates for dyeing high-weather-resistance textiles.

中文翻译：

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自分散酞菁蓝15：4颜料在羊毛纺织品染色中的制备与表征

通过重氮偶合反应制得自分散颜料。该颜料与由对氨基苯磺酸与亚硝酸钠反应生成的芳族重氮盐反应。由于颜料表面上的磺酸基，颜料颗粒的表面带负电。在中性pH下，颜料粒径和ζ电位分别为134.5nm和-45.4mV。通过调节pH值使羊毛表面带正电。然后，阴离子自分散颜料将阳离子羊毛染色。结果表明，自分散颜料在没有粘合剂的情况下可以很好地粘附，并且K / S值与pH值，染色时间和颜料量密切相关。羊毛的色牢度好，耐光色牢度为5级，比酸性染料好。自分散颜料是染色高耐候性纺织品的潜在选择。