Community Research and Development Information Service - CORDIS

Establishment of dyeing formulations for cotton, wool and their polyester blends

In order to perfect dyeing recipes in this medium, three main routes have been investigated: treatment of the textile substrate, alteration of the dye molecule, and modification of the solvent properties. With increasing pressure, temperature, density and time a better dyeing result of natural fibres is achieved with regard to depth of shade and level-ness. Adding modifiers such as water and methanol further improves dyeing results. Applying a fabric pre-treatment or using a fluoro-surfactant may also bring enhancements for cotton dyeing. Other parameters such as agitation, a gradually pressure reduction, the arrangement of the different ingredients within the dyeing chamber, or SCO(2) post-rinsing also proved to be relevant. In most cases the analysis of natural fibres dyed from SCO(2) revealed a more or less pronounced ring-dyeing effect. Dyeing of polyester blends with dispersed and solvent dyes from SCO(2) led to deep colorations. The polyester component is intensely dyed and over the whole fibre cross-section, but the cotton or wool component is mainly ring-dyed. A homogeneous coloration of both components of polyester/wool blends is achieved by application of reactive disperse dyes for the wool and conventional disperse dyestuffs for the polyester.

Reported by

Institut Textile de France Direction Regionale de Lyon (1)
Avenue Guy de Collongue
B.P. 60F-6 Ecully
France
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