黑米色素的稳定性及其对羊毛织物的染色

Stability of pigment extracted from black rice and its dyeing properties on wool fabric

从黑米中提取天然色素并对其进行紫外-可见光谱分析,探讨该色素对酸碱、金属离子及温度变化的稳定性;以该色素上染羊毛织物,研究染色pH值、温度、时间、媒染剂对染色织物K/S值的影响,并优化了染色工艺。结果表明,黑米色素对pH值变化及金属离子较敏感,对温度变化(≤90℃)相对稳定。不同媒染剂可染得不同色泽的羊毛织物,且染色样品的摩擦牢度及皂洗沾色牢度均较好,但褪色牢度除Cu2+和Fe2+媒染样品较好外,其余较差。

A natural pigment is extracted from black rice and the influences of metal ions, pH value and temperature on stability of the pigment are discussed by UV-visible spectra analysis. The extracts are applied to wool dyeing, and the dyeing process is optimized by studying the influences of dyeing pH value, dyeing temperature, dyeing time and metal ions on K/S value of the dyed wool fabrics. The results show that black rice pigment is sensitive to metal ions and the pH value change, it is relatively stability to the change of temperature （ ≤90 ℃ ）. The c010r of dyed wool fabrics varies with metal ions and the crock fastness and soaping fastness（staining wool） of the dyed fabrics are better, but the fading fastness are poor except Cu2＋ and Fe2＋ mordant samples.