Dyeing natural fibres in supercritical carbon dioxide using a nonionic surfactant reverse micellar system

Abstract

A reverse micellar system in supercritical carbon dioxide has been developed as a dyeing medium. Water‐soluble dyes such as reactive dyes and acid dyes could be sufficiently solubilised in the interior of a specially constituted reverse micelle. Protein fabrics, silk and wool, were satisfactorily dyed even in deep shades with conventional acid dyes without any special pretreatment. Cotton cellulose fabric was also dyed with conventional reactive dyes when the electrostatic force of repulsion between dye and cotton was eliminated. Compared to previously proposed supercritical dyeing methods, dyeing of fabrics with this system could be performed at low temperatures and pressures in a short time.

Non‐aqueous dyeing of cotton fibre with reactive dyes: A review

“…They can be applied as dye carriers to facilitate the dyeing of textile fibres in non‐aqueous media. For example, attempts have been made to dissolve water‐soluble dyes in non‐aqueous media through the use of a reverse micellar system, which is capable of solubilising a small amount of water in the interior of a micelle to provide a stable and aqueous micro‐environment, known as a “water pool”, in non‐aqueous media, as illustrated in Figure …”

Supercritical fluid textile dyeing technology

“…Recently, there have been new developments based on reverse micellar systems for solubilization of conventional basic, acid, direct or reactive dyes from water dyeing for scCO 2 -based dyeing of cotton, wool, silk, acrylics and polyamide (Sawada et al, 2002(Sawada et al, , 2003(Sawada et al, , 2004a(Sawada et al, , 2004bSawada and Ueda, 2004;Jun et al, 2004;Lewin-Kretzschmar and Harting, 2004;Jun et al, 2005). In the future it has to be evaluated whether this can be an ecologically sound alternative for scCO 2 dyeing of cellulose and protein fibres.…”

Effects of molecular structure on dyeing performance and colour fastness of yellow dyestuffs applied to polypropylene fibres in supercritical carbon dioxide

“…[4] in 1993 for dyeing hydrophobic fibres. Since these studies, the method has become popular and many researchers have investigated dyeing in scCO 2 [5–17].…”