The Use of Modified Fenton Chemistry for Reducing Energy Consumption during Dyeing of Wool and Nylon 6 Fabrics with Acid Dyes

ABSTRACT

Energy is the most expensive component in wet processing of textiles and many researchers direct their efforts toward energy-saving processes. In this investigation, we report a low-temperature dyeing process for wool and polyamide 6 (PA 6) fabrics with acid dyes in presence of a novel modified Fenton’s reagent (MFR), namely H₂O₂/FeSO₄7H₂O/oxalic acid. The said fabrics were dyed with acid dyes containing one and two sulfonic groups in presence of MFR at different pH, temperatures, and durations. The fastness properties of the dyed fabrics were evaluated. The alteration in the chemical structure of the modified wool was monitored by Infrared Spectroscopy together with alkali and urea-bisulfite solubility. The tensile strength and elongation at break of the dyed samples were assessed. Results indicate that the proposed MFR enhanced the dyeability of wool and PA 6 fabrics with the anionic dyes at relatively low temperature. The fastness properties of the dyed fabric were improved that assures the formation of relatively strong covalent bonds between the said fabrics and dyes. The spectroscopic and chemical analyses proved that limited amount of the disulfide bonds in wool keratin were oxidized during the proposed dyeing process. No severe deterioration in the mechanical properties of the dyed samples.

摘要

在纺织品的湿法加工中，能源是最昂贵的组成部分，许多研究人员致力于节能工艺. 本文报道了在新型改性Fenton试剂（MFR）存在下，用酸性染料对羊毛和聚酰胺6（pa6）织物进行低温染色的工艺; 即H2O2/FeSO47H2O/草酸. 用含有一个和两个磺酸基的酸性染料，在不同的pH值、温度和持续时间下，在MFR存在下对上述织物进行染色. 对染色织物的牢度进行了评价. 通过红外光谱、碱和亚硫酸氢脲的溶解度监测改性羊毛化学结构的变化. 对染色样品的拉伸强度和断裂伸长率进行了测定. 结果表明，所提出的MFR提高了阴离子染料在较低温度下对羊毛和PA6织物的可染性. 提高了染色织物的牢度，保证了织物与染料之间形成较强的共价键. 光谱分析和化学分析表明，羊毛角蛋白中的二硫键在染色过程中被氧化的程度是有限的. 染色样品的机械性能没有严重恶化.

Keywords:

• Wool
• Polyamide 6
• Fabric
• Acid Dye
• Dyeing
• Modified Fenton’s reagent
• Energy-saving Dyeing

关键词:

• 羊毛
• 聚酰胺
• 织物
• 酸性染料
• 染色
• 改性芬顿试剂
• 节能染色

Research highlights

• This manuscript provides and a new approach for reduction of energy consumption during dyeing of wool and polyamide 6 fabrics using a modified Fenton’s Reagent.

• The novelty of this work is the use of modified Fenton’s chemistry to fortify the bonding between the textile substrate and acid dye molecules via covalent bonding.

• Mechanism of reaction of the modified Fenton’s reagent with wool and polyamide was proposed.