Simple and Easily Applicable Method for Reducing Freshwater Consumption in Dyeing of Wool Fabric

ABSTRACT

Textile wet processing is one of the most water-consuming industries. The deficiency of soft water in some parts of the world urged the researchers to exert effort toward minimization of water consumption during textile wet processes. In this work, we bleach wool fabrics by hydrogen peroxide, followed by utilization of the discharged bleaching bath (DBB) in dyeing of wool with acid, reactive, and basic dyes. The residual H₂O₂ in the bleaching bath was decomposed into water and oxygen by adding low concentrations of potassium iodide (KI). Results of this investigation clarify that treatment of the DBB with KI is mandatory to make the bath appropriate for wool dyeing. The dyeability of wool toward the said dyes in KI-treated DBB is significantly higher than that upon dyeing with tap water. The fastness properties of the dyed fabric to washing, perspiration, and light were assessed. The turbidity, pH, total dissolved salts (TDS), total suspended salts (TSS), biological oxygen demand (BOD), and chemical oxygen demand (COD) of the bleaching effluent were assessed. Solubility of bleached/dyed wool fabrics in alkali and urea-bisulfite solutions assures the modification of some disulfide bonds along wool keratin macromolecules into cystine oxides/cysteic acid residues, and consequently the dyeability was enhanced.

摘要

纺织湿法加工业是最耗水的工业之一. 世界上一些地区缺乏软水，促使研究人员努力减少纺织湿法工序的耗水量. 在这项工作中，我们用过氧化氢漂白羊毛织物，然后利用放电浴(DBB)与酸性，活性和碱性染料染色羊毛. 通过加入低浓度的碘化钾(KI)，漂白槽中残留的H2O2分解为水和氧. 研究结果表明，用碘化钾处理废浴是使废浴适合羊毛染色的必要条件. 羊毛对经碘化钾处理的废浴中所述染料的染色能力明显高于用自来水染色. 对染色织物的耐水洗、耐汗、耐光牢度进行了评价. 对漂白废水的浊度、pH、总溶解盐(TDS)、总悬浮盐(TSS)、生物需氧量(BOD)和化学需氧量(COD)进行了评价. 漂白/染色羊毛织物在碱和亚硫酸氢脲溶液中的溶解度保证了羊毛角蛋白大分子上的一些二硫键被修饰成胱氨酸氧化物/半胱氨酸残基，从而提高了染色性能.

KEYWORDS:

• Wool
• fabric
• water
• bleaching
• acid dye
• reactive dye
• basic dye
• dyeing

关键词:

• 羊毛
• 面料
• 水
• 漂白
• 酸性染料
• 基本的染料
• dyeing 染色

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.