Dyeing processes usually consume a large amount of water and toxic chemicals, thus inducing environmental pollution. Therefore, we have designed here an eco-friendly process of dyeing wool fibers using natural dyes extracted from henna leaves in decamethyl cyclopentasiloxane. In this process, traditional hazardous metallic mordants and heavy metal salts were substituted by safe chitosan to pretreat wool fibers. Decamethyl cyclopentasiloxane was used to reduce the consumption of the high amount of water needed in traditional dyeing. Chitosan-treated and untreated samples were dyed with different henna extract/decamethyl cyclopentasiloxane suspensions at 40 °C, 60 °C, 80 °C and 90 °C. Results showed that dye uptake, fixation rate and apparent color depth of the samples dyed in henna extract/decamethyl cyclopentasiloxane suspensions were higher than water-based dyed samples. The dye uptake of samples dyed using our system reached 80–98%, as compared with 70–75% for water-based dyed samples; accordingly, the color strength and fixation rate were increased.

中文翻译：

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在非水介质中使用指甲花提取物对羊毛纤维进行可持续染色

染色过程通常会消耗大量的水和有毒化学物质，从而导致环境污染。因此，我们在这里设计了一种生态友好的方法，使用在十甲基环五硅氧烷中从指甲花叶中提取的天然染料对羊毛纤维进行染色。在此过程中，传统的有害金属媒染剂和重金属盐被安全的脱乙酰壳多糖替代，以预处理羊毛纤维。十甲基环五硅氧烷用于减少传统染色中所需的大量水的消耗。壳聚糖处理和未处理的样品分别在40°C，60°C，80°C和90°C下用指甲花提取物/十甲基环戊硅氧烷悬浮液染色。结果表明，染料吸收，指甲花提取物/十甲基环五硅氧烷悬浮液中染色的样品的固色率和表观色深均高于水基染色样品。使用我们的系统染色的样品的染料吸收率达到80-98％，而水基染色样品的染料吸收率则为70-75％。因此，色强度和固色率增加。