The practical application of a sulphur black dye relies on its ability to dye cotton fibres with pure black colour and maintain the colour with high light fastness. Here, we report a synthesis method to prepare a novel water-soluble reactive sulphur black dye. The approach involves the reduction of CI Sulphur Black 1 to its leuco form and subsequent reaction with a water-soluble intermediate containing reactive groups synthesised from amino acid and cyanuric chloride. The optimal carboxyl and reactive group content of the water-soluble reactive sulphur black dye is 141 mmol/100 g, and the water solubility can reach 92 g/L. The fixation of the reactive sulphur black dye on cotton reaches 89% in a pad dyeing process without using sodium sulphate. The reactive sulphur black dye can achieve a light fastness of grade 6-7, a dry rub fastness of grade 4 and a wet rub fastness of grade 2, comparable or higher than the conventional CI Sulphur Black 1. The dyeing results showed that the novel water-soluble reactive sulphur black dye has excellent performance and good application prospects.

中文翻译：

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新型水溶性活性硫化黑染料的合成及染色性能

硫化黑染料的实际应用依赖于其能够将棉纤维染成纯黑色并保持高耐光牢度的颜色。在这里，我们报道了一种制备新型水溶性活性硫化黑染料的合成方法。该方法涉及将 CI 硫化黑 1 还原为其隐色形式，然后与含有由氨基酸和氰尿酰氯合成的反应基团的水溶性中间体反应。水溶性活性硫化黑染料的最佳羧基和反应基团含量为141mmol/100g，水溶性可达92g/L。在不使用硫酸钠的轧染过程中，活性硫化黑染料在棉上的固色率达到89%。活性硫化黑染料可达到6-7级耐光牢度，