Synthesis of reactive dyes based on the bis‐(N‐carboxymethylamino)monoquaternary‐triazine‐bis‐ethylsulphone reactive group. Part 1: Application to cotton cellulose

Abstract

Reactive dyes containing the bis‐(N‐carboxymethylamino)monoquaternary‐triazine‐bis‐ethylsulphone [bis‐(N‐CMA)‐MQT‐bis‐ES] group and related derivatives have been synthesised. When boiled under mildly acidic conditions, such dyes are able to form two small vinylsulphone dye molecules through a process of 1,2‐trans elimination. The bis‐(N‐CMA)‐MQT‐bis‐ES dye was applied using different dyeing procedures (novel dyeing methods 1 and 2). The dyeing and soaping‐off results of bis‐(N‐CMA)‐MQT‐bis‐ES dye were compared with a model sulphatoethylsulphone dye applied using the conventional alkaline fixation method used for applying this type of reactive dye to cotton. The bis‐(N‐CMA)‐MQT‐bis‐ES dye showed higher exhaustion and fixation values applied using novel dyeing method 2 compared with the sulphatoethylsulphone dye applied using the alkaline fixation method. The soaping‐off efficiency for the large bis‐(N‐CMA)‐MQT‐bis‐ES dye applied using novel dyeing method 2 was the same as that obtained for the sulphatoethylsulphone dye applied using the alkaline fixation method.