Cotton fabric dyed with natural madder dye exhibits poor dyeing properties. Although mordant improves the dyeing property of cotton fabric, it changes the madder dye colour tonality (the hue angle). In this study, ethylene glycol diglycidyl ether (EGDE) was used as a crosslinking agent to dye cotton fabrics with natural madder dye and improve the surface colour depth (K/S) and colour fastness. The molecular structure, crystal structure and surface morphology of crosslinked dyed cotton were analysed using Fourier Transform–infrared spectroscopy, X-ray diffractometry and scanning electron microscopy, respectively. The results showed that crosslinked dyed cotton fabric had two different ether bonds, and that crosslinked dyeing mainly occurred in the amorphous area. Compared with direct dyed cotton fabric, the hue angle (h°) of crosslinked dyed cotton fabric did not undergo an obvious change, K/S increased by 5, and the rubbing fastness, washing fastness and light fastness increased by 2-3 levels, indicating that the dyeing property of cotton fabric with natural madder dye could be improved by using EGDE as a crosslinking agent. Compared with raw cotton fabric, the bending length of crosslinked dyed cotton fabric was reduced by 2.28 cm, the wrinkle recovery angle increased by 80.7° and the ultraviolet protection factor value was more than 40, indicating that crosslinked dyed cotton fabric had great softness, wrinkle resistance and excellent ultraviolet resistance. In addition, the water contact angle of the cotton fabric only changed slightly after crosslinking dyeing, and the crosslinked dyed cotton fabric still had good hydrophilicity. Therefore, EGDE was a viable crosslinking agent for cotton fabric with madder dye.

中文翻译：

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乙二醇二缩水甘油醚在茜草染料交联染色棉织物中的应用

用天然茜草染料染色的棉织物染色性能较差。媒染剂虽然改善了棉织物的染色性能，但它改变了茜草染料的色调（色相角）。本研究以乙二醇二缩水甘油醚（EGDE）为交联剂，用天然茜草染料对棉织物进行染色，提高表面色深（K/S) 和色牢度。分别使用傅里叶变换红外光谱、X射线衍射和扫描电子显微镜分析了交联染色棉的分子结构、晶体结构和表面形态。结果表明，交联染色棉织物具有两个不同的醚键，交联染色主要发生在无定形区。与直接染色棉织物相比，交联染色棉织物的色相角（h°）没有发生明显变化，K/S提高5级，摩擦牢度、水洗牢度和耐晒牢度提高2-3级，说明以EGDE为交联剂可以提高棉织物与天然茜草染料的染色性能。与原棉织物相比，交联染色棉织物的弯曲长度减少了2.28厘米，褶皱回复角增加了80.7°，紫外线防护系数值大于40，表明交联染色棉织物具有很好的柔软性、抗皱性。抗性和优异的抗紫外线性。此外，棉织物的水接触角在交联染色后仅略有变化，交联染色的棉织物仍具有良好的亲水性。因此，EGDE 是一种可行的茜草染料棉织物交联剂。