Abstract

Improvement of Dye Extraction from Common Walnut Stain and Optimization of Wool Dyeing Conditions

Author(s): Younes Chemchame*, Hajar Benzbir, Amina Kachachi, El Bouchti Mehdi and Aboubakr Kharchafi

Different conditions for extracting juglone from the pigment of common walnut have been investigated. Means of improving dye exhaustion and fixation rates on wool yarn and fabric have also been studied. The different extraction procedures investigated were decoction, short-term and long-term aqueous maceration, and aqueous maceration at 40°C in neutral and alkaline media. Optimal dye extraction was achieved in alkaline solution at pH 10 at 40°C for 2 h. Dyeing was investigated in solutions of various pH. The dye exhaustion rate was considerably increased when an acidic dye bath was used. Post- oxidation has been tested as a means of improving the juglone fixation rate and it’s washing fastness on wool yarn and fabric.