Abstract
In recent years, new concepts in textile dyeing technology have been investigated which aim to decrease the use of chemicals and the emission of water. In this work, dyeing of cotton textiles with reactive dyes has been investigated in a silicone non-aqueous dyeing system. Compared with conventional aqueous dyeing, almost 100% of reactive dyes can be adsorbed on cotton textiles without using any salts in non-aqueous dyeing systems, and the fixation of dye is also higher (80%~90% for non-aqueous dyeing vs. 40%~50% for traditional dyeing). The pseudo-second-order kinetic model can best describe the adsorption and equilibrium of reactive dyes in the non-aqueous dyeing systems as well as in the traditional water dyeing system. In the non-aqueous dyeing systems, the adsorption equilibrium of reactive dyes can be reached quickly. Particularly in the siloxane non-aqueous dyeing system, the adsorption equilibrium time of reactive dye is only 5–10 min at 25 °C, whereas more time is needed at 60 °C in the water dyeing system. The surface tension of non-aqueous media influences the adsorption rate of dye. The lower the surface tension, the faster the adsorption rate of reactive dye, and the higher the final uptake of dye. As a result, non-aqueous dyeing technology provides an innovative approach to increase dye uptake under a low dyeing temperature, in addition to making large water savings.
Highlights
In recent years, tremendous efforts have been focused on saving water and energy in the textile industry due to environmental pressure [1,2,3,4]
Friendly dyeing technology which uses non-polar media to substitute for water
Cotton woven fabric (130.5 g/m, yarn count: 42S × 42S, yarn density: 148 × 285) was dyed with reactive dye which was obtained from Haitong Printing&Dyeing Co., Ltd, (Hangzhou, China)
Summary
Tremendous efforts have been focused on saving water and energy in the textile industry due to environmental pressure [1,2,3,4]. Non-aqueous dyeing media for traditional water-based dyeing in the textile industry. Research has demonstrated that siloxane non-aqueous medium is safe to both industrial applications. Siloxane non-aqueous medium human the cleaning environment [20,21,22]. Years, we have used this non-aqueous medium applied widely in dry dye/siloxane cleaning as a emulsion new medium [23].system. We used this non-aqueous medium to prepare a reactive dyeing forhave dyeing cotton textiles. Since and reactive dye is totally incompatible with there is a in siloxane non-aqueous medium. Result, a lotinformation of reactive dyes with cotton textilesofinreactive non-aqueous dyeingin systems.
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