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Substitution of hydrosulphite in natural indigo dyeing using natural ingredients

机译：使用天然成分在天然靛蓝染色中取代亚硫酸氢盐

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摘要

Indigo, the most popular dyestuff for the colouration of denims is a water insoluble dye, which is converted to its water-soluble leucoform using a reducing agent in presence of alkali. Conventional reducing agent i.e. sodium hydrosulphite is not environment friendly and therefore, various research work have been reported for the substitution of sodium hydrosulphite. In the present study a natural ingredients system is used to reduce both natural and synthetic indigo dye. Optimisation of concentration of natural ingredients viz, fenugreek, jaggery, lime and soda ash, was carried out. Cotton yarns were dyed at different concentrations of the indigo dyes using natural reducing system and the dye uptake was determined by extraction of dye with dimethylformamide. For comparison, cotton yams were also dyed with natural and synthetic indigo dye using sodium hydroxide and sodium hydrosulphite system. The results reveal that dye uptake with natutsl seducing spstem is about 25-30% Jess as compared to hydrosulphite system. Complete substitution of hydrosulphite by natural reducing system is not possible. The efficacy of the reducing bath for both the reducing systems was checked by measurement of redox potential of the blank baths.
机译：靛蓝是用于牛仔布着色的最流行的染料，是一种水不溶性染料，在碱的存在下使用还原剂可将其转化为水溶性隐色仿。常规的还原剂，即亚硫酸氢钠不是环境友好的，因此，已经报道了各种研究工作来替代亚硫酸氢钠。在本研究中，天然成分系统用于还原天然和合成靛蓝染料。进行了天然成分（即胡芦巴，胡麻，石灰和纯碱）浓度的优化。使用自然还原系统将棉纱染成不同浓度的靛蓝染料，并通过用二甲基甲酰胺萃取染料确定染料的吸收率。为了进行比较，还使用天然和合成靛蓝染料使用氢氧化钠和亚硫酸氢钠体系对棉纱进行染色。结果表明，与亚硫酸氢盐体系相比，natutsl引诱系统对染料的吸收约为25-30％Jess。用自然还原系统无法完全取代亚硫酸氢盐。通过测量空白浴的氧化还原电势来检查还原浴对于两种还原系统的功效。

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