柳树叶天然色素的提取及用于真丝绸染色

Extraction of Natural Dye from Willow Leaves and Dyeing on Silk Fabric

研究了柳树叶天然色素的提取工艺及提取液对真丝绸的染色工艺。结果表明,用氢氧化钠溶液对柳树叶提取可提取到更多的色素。提取的优化工艺为：氢氧化钠0.25mol/L,提取温度100℃,提取时间60min,柳树叶与氢氧化钠溶液的质量比为1∶40。柳树叶提取液对真丝绸直接染色的优化工艺为：染液pH值4.00~5.00,染色温度80℃,染色时间45~60min,浴比50∶1。媒染可提高染色真丝绸的色牢度。

The extraction conditions for natural dye from willow leaves and the dyeing process of silk fabrics with the extraction dyes were studied.It was found that more natural dye from willow leaves could be extracted in sodium hydroxide solution.The optimum extracting conditions were as follows：NaOH 0.25mol/L,extraction temperature 100℃,extraction time 60 min,mass ratio of willow leaves and sodium hydroxide solution 1∶40.The optimum conditions for the direct dyeing on silk fabrics were as follows：pH value 4.00~5.00,bath ratio 50∶1,dyeing temperature 80 ℃,dyeing time 45~60 min.The dyeing fastnesses of dyed silk fabrics were improved by mordanting.