Optimized Dyeing of Cotton with semi-synthetic Embelin Ninhydrin Dye Obtained by Chemical Modification of Embelin from Embelia Schimperi

Abstract

Chemical modification is a promising path to address the limitations of a natural dye, such as limited shades and inadequate fastness properties. This study investigated the modification of embelin (2, 5-dihydroxy-3-undecyl-1, 4-benzoquinone) a plant-based benzoquinone compound from Embelia schimperi (Myrisinaceae family) with ninhydrin to get a semi-synthetic dye. The modified dye was applied to cotton fabric along with mordants to provide different shades. Optimum dyeing conditions were determined using Central Composite Design which showed optimum conditions of pH at 9, time of 60 min and temp of 80°C. The color fastness ratings were in the range of 4–5 evaluated on the Gray scale.

化学改性是解决天然染料的局限性 (如色度有限和牢度不足) 的一条很有前景的途径. 本研究探讨了用茚三酮对来自杨梅科的植物基苯醌化合物embelin (2, 5-二羟基-3-十一烷基-1, 4-苯醌) 进行改性以获得半合成染料. 改性染料与媒染剂一起应用于棉织物, 以提供不同的色度. 采用中心复合设计法确定了最佳染色条件, 结果表明, 最佳染色条件为pH值为9, 时间为60分钟, 温度为80°C. 根据灰度评估, 色牢度等级在4-5范围内.