Influence of an Organic Solvent and a Cationic Surfactant on Sulphite Treatments for Preventing Shrinkage of Wool Fabrics

Abstract

Knitted wool fabrics were treated with sodium sulphite in an isopropanol/water medium in the presence or absence of a cationic surfactant to promote shrink resistance in wool fibers. The organic solvent and the cationic surfactant allow the SO 3 = anions to react with specific cystine residues, promoting as well some changes in the physicochemical properties of the wool, which prevent shrinkage.

Degradative Wool Shrinkproofing Processes: Part II: Lipid Modification

“…Bear in mind that changes in the treatment medium, especially the optimum 50% isopropanol/water medium, lead to increased shrink resistance [4]. We demonstrated previously the importance of the treatment medium for other dcgradalive shrink resistant treatments with Na2S03, in which a certain amount of organic solvent or a cationic surfactant is necessary to achieve shrink resistance [7,8].…”

The desorbing action of polyvinylpyrrolidone

“…It should be noted that, even assuming straight lines were obtained, all the data presented are subject to about 10% uncertainty. The measured thermodynamic parameters provide an insight into molecular interactions, such as hydrogen bonding, hydrophobic bonding, van der Waals interactions and electrostatic interactions, between the bound MG molecules and the PVP binding sites in aqueous solution [4]. They also clarify the nature of the conformational changes in both the PVP and the MG molecule on binding [5].…”

Shrinkage Modifications of Wool Fabrics by Sulphite Treatments in Aqueous Organic Solvent Media: Effect of the Organic Solvent on the Internal Lipids

“…The maximum shrink-resistance effect is reached when the ISO concentration is 50% (v/v), and above a definite ISO concentration (30%), the shrinkage value greatly depends on the temperature of the treatment [8].…”

“…Since the s6rinkproofing effect in these treatments depends on the organic polar solvent concentration and the temperature [8], we studied the effect of these two parameters on the dissolution of the lipoproteic material. Experimental MATERIALS Fabrics knitted to a cover factor of 12.6 from R72tex/2 botany wool yarns supplied by IWS (Bkley) were used.…”