Dyeing Properties of Natural Dyes Extracted from the Junipers Leaves (J. excelsa Bieb. and J. oxycedrus L.)

In this paper, two natural dyes were extracted from Junipers leaves (Juniperus oxycedrus L. and Juniperus excelsa Bieb.). Wool yarn (for carpet) was dyed with the extract using ferrous (II) sulfate, potassium dichromate and sodium sulfate as mordant. Then, CIELab (L*, a*, b*, c,* and h) values, color differences (ΔE) and color strength (K/S) values of dyed wool yarns were examined and the fastness properties of dyed wool against dry and wet rubbing were evaluated. According to the experimental results, the use of mordant increased the color strength of dye goods. All mordant increased the rub fastness of dyed samples such as similar scientific studies previously. Compared to two junipers, dyeing samples of J. excelsa are dyed darker than that of J. oxycedrus.     

桉树皮提取液对真丝织物染色性能的研究

采用水溶液提取桉树皮色素,利用气相质谱-色谱联用仪(GC-MS)分析水抽提物中的有效成分,并将其用于真丝织物的染色;探究了染色方法、媒染剂种类、媒染剂质量分数、染色温度及染色时间对真丝织物染色性能的影响。结果表明:使用明矾、硫酸铝、硫酸锌、硫酸铜作为媒染剂时,最佳的染色方法是同浴媒染法,优化染色工艺为浴比1︰50,硫酸铜质量分数5%,染色温度95℃,染色时间50 min。媒染剂对真丝织物的颜色特征值有影响,且媒染能提高其各项色牢度等级,尤其是耐光色牢度。     

媒染剂对黑米色素冷染柞蚕丝绸色光的影响

为解决天然染料染色缺少蓝、紫色调的问题,提取天然黑米色素用于柞蚕丝绸的冷轧堆染色工艺,研究了Cu2+、Fe2+、Sn2+等单一媒染离子以及不同浓度配比的Sn2+/Fe2+及Sn2+/Cu2+复合媒染离子对染色织物色光、色深值及染色牢度的影响。结果表明,黑米色素冷轧堆染色柞蚕丝绸可获得较好的染色效果,各种媒染剂媒染可得到不同色泽的柞蚕丝绸,Sn2+/Fe2+及Sn2+/Cu2+拼混媒染可分别得到一系列蓝、紫色调的柞蚕丝绸,复合媒染剂较单一媒染剂表现出更优异的色深值及染色牢度,拼混媒染样品的皂洗和摩擦牢度可达到3~4级。     

真丝绸的天然茶多酚染整加工

研究了茶多酚(TP-95)在真丝上的染色性能,分别采用媒染剂硫酸亚铁和硫酸铜同浴法与茶多酚络合,通过正交试验确定媒染剂用量、染色温度、染色时间和pH值的茶多酚染色优化工艺,对染色织物牢度等性能进行测试。结果表明,采用媒染剂能显著提高茶多酚的上染性能,硫酸亚铜的效果优于硫酸亚铁;在铜离子质量浓度为2 g/L、TP-95用量5%(omf)、pH值6.4和90℃条件下浸染90 min,可达到较高的K/S值;染色后真丝织物牢度性能优异,且具有良好的抗紫外效果。     

Dyeing of Chicken Feather Fibers with Natural Dyes

ABSTRACT

In this study, coloration of the feather fibers with natural dye sources was examined. By this way it was planned to introduce colored chicken feather fibers to serve for different textile applications. For the coloration of the feather fibers, the natural dye sources “Buckthorn,” “Madder,” and “Hibiscus” were used. During the dyeing process, different mordanting agents were added to the dye bath to see the effect of the mordanting agents and also dyeing of the feather fibers without use of any mordanting agent was investigated. Afterwards samples were evaluated in terms of color efficiencies and color values. Moreover, the washing and light fastnesses of the samples were tested. As a result, it was observed that the tested natural dye sources can be used for the coloration of the chicken feather fibers and different colors can be easily obtained with the use of these natural dye sources and mordants.     

The role of natural dyes in the UV protection of fabrics made of vegetable fibres

The safest protection from ultraviolet (UV) radiation exposure is offered by textiles including various apparels, accessories such as hats and shade structures such as umbrellas. Their protectiveness depends on fabric composition, (natural, artificial or synthetic fibres), fabric construction (porosity, weight and thickness) and dyeing (natural or synthetic dyes, dye concentration, UV-absorbing properties, etc.). In this study the UV-protection properties were investigated on fabrics made of vegetable fibres (cotton, flax, hemp and ramie), with different construction parameters (drapery and apparel fabrics), dyed with some of the most common natural dyes. The effect of a tannins-based mordant (the galls of Quercus infectoria) on UV-protection capacity was also tested. UV radiation transmittance of fabrics was measured by two methods: one based on the utilisation of a spectrophotometer equipped with an integrating sphere (in vitro test), and the other based on outdoor measurements taken by a spectroradiometer. Transmittance measurements were used to calculate the Ultraviolet Protection Factor (UPF).Our results revealed that thick and dense (cover factor, CF > 94%) drapery fabrics made of vegetable fibres usually showed good UV-protection levels even if undyed. The use of the tannins-based mordant increased, even without dyeing, the UV-protection level up to the very good and/or excellent protection categories when fabric construction was suitable. Dyeing did not further increase the protection level.Lighter fabrics, usually used for apparel, even showed high UV-protection level after just dyeing, provided that CF was above 94%.Taking into account the high concentrations of dyes used in the present work and the utilisation of mordants containing tannins, slight differences in UV-protection capacity were detected among natural dyes tested and between the two different methods of transmittance measurement. However, UV-protection category defined from outdoor measurements was often higher than that calculated by the in vitro test, indicating an underestimation of the actual protection level of tested fabrics assessed by the latter.     

玫瑰红色素对羊毛和蚕丝的媒染性能

以FeSO4和ZnSO4·7H2O为媒染剂,采用玫瑰红提取液对羊毛和蚕丝进行染色,探讨了媒染温度、时间、媒染剂用量、玫瑰红提取液用量对媒染性能的影响,以及染色织物的牢度。结果表明,媒染剂FeSO4和ZnSO4·7H2O用量为2g／L、提取液用量为10mL、羊毛和蚕丝织物均为2g时,染色织物具有较深的色泽和良好的色牢度。