Effect of Mordant Bleaching on the Optical and Mechanical Properties of Black Tunisian Wool and Optimization of the Bleaching Process

ABSTRACT

White wool occupies a very important place on the commercial market because it can be dyed in any color. In nature, however, wool fibers are usually found white but may be black; sometimes they are shades of white, yellow and, in some cases, brown or black, because of their natural pigment, melanin. In this study, copper sulfate and iron sulfate were used in the treatment of Tunisian wool (Black of Thibar) to evaluate their effectiveness in terms of color removal and minimal damage to wool fibers. Once the most effective mordant agent was chosen, the effects of hydrogen peroxide concentration, bleaching time, and temperature on the wool sample bleaching were studied. The results showed that iron sulfate is the most effective mordant agent in the bleaching process of pigmented wool for a good base of dyeing and finishing, since it guarantees the best optical properties with the minimum damage to the fibers. In addition, it was found that the optimal bleaching was achieved for a hydrogen peroxide concentration of 87.5 mL/L, a treatment time of about 90 min and a temperature of about 60°C.

摘要

白羊毛在商业市场上占有非常重要的地位，因为它可以染任何颜色. 然而，在自然界中，羊毛纤维通常是白色的，但也可能是黑色的; 有时它们是白色的，黄色的，有时是棕色或黑色的，因为它们的天然色素黑色素. 在这项研究中，硫酸铜和硫酸铁被用于处理突尼斯羊毛（Thibar的黑色），以评估它们在去除颜色和对羊毛纤维的损害最小方面的有效性. 在选择了最有效的媒染剂后，研究了过氧化氢浓度、漂白时间和温度对羊毛样品漂白的影响. 结果表明，硫酸铁是染色羊毛漂白过程中最有效的媒染剂，它在保证最佳光学性能的同时，对纤维的损伤最小，是一种良好的染整基础. 此外，发现过氧化氢浓度为87.5ml/L，处理时间约90min，温度约为60℃时，漂白效果最佳.

KEYWORDS:

• Pigmented wool
• depigmentation
• copper sulfate
• iron sulfate
• bleaching
• tenacity

关键词:

• 染色羊毛
• 脱色
• 硫酸铜
• 硫酸铁
• 漂白
• 韧性

Supplementary material

Supplemental data for this article can be accessed on the publisher’s website.