Sustainable Dyeing Mechanism of Polyester with Natural Dye Extracted from Watermelon and Their UV Protective Characteristics (original) (raw)
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The Journal of The Textile Institute, 2020
Different approaches have been taken to develop a greener and sustainable cotton coloration process to reduce carbon footprint. Natural compound as a colorant is an excellent alternative to the harsh chemical-based reactive cotton coloration process. However, natural coloration requires improvement in colorimetric properties and a better understanding of the colorant absorption mechanism. Here, we report a process for cotton coloration using bio-friendly natural colorant extracted from watermelon rind. The optical and colorimetric properties of watermelon rind saps (WRS) and WRS dyed cotton fabrics, dye-fiber bonding, chromophores absorption and color-fastness were studied. The experiment showed that the absorption of chromophores into the fabric mainly depends on their molecular weight, the position of the anchoring group and thermal stability. Chromophore adsorptions ranged from 55.4 to 81.7% resulting in excellent dye-fiber chemical potential. Coloration temperature and mordant significantly affect the colorimetric properties of cotton fabric as found in this study. All the dyed cotton samples showed good color-fastness to washing, water, rubbing, and perspiration. Furthermore, cotton dyed with WRS had better UV-protection factor (UPF) than that of the mosty used chemical-intensive reactive dyed sample. Finally, the ecological and economic aspects of WRS dyeing were also compared with commercial reactive dyes.
Investigation of dyeing parameters (temperature, time and pH), color fastness assessments and ultraviolet protection factor (UPF) of mangrove bark extract on nylon fabric were conducted. The optimum dyeing conditions were obtained at 90 o C, 60 min and pH 5, respectively. Dyeing with different metal mordants (aluminium potassium sulfate, ferrous sulfate, copper sulfate, and stannous chloride) was also investigated. The ratings of color fastness testing showed that most of color fastness properties of dyed fabrics were generally acceptable except color fastness to washing due to considerable change in color of samples after subjected to washing test. Dyed nylon fabrics showed the improvement in UV-protection property.
DYEING, FASTNESS AND UV PROTECTION PROPERTIES OF COTTON FABRIC DYED WITH MANGROVE BARK EXTRACT
Cotton fabric was dyed with a natural dye extracted from mangrove bark by the exhaustion process. Optimal results were accomplished when dyeing at 90 °C for 60 min and at pH 5. The dyeing was subsequently conducted with and without metallic salt mordants, using three different mordanting methods, pre-mordanting, meta-mordanting and post-mordanting. The mordanting not only improved color strength of the dyed cotton fabric, but also produced a variety of color shades. The color fastness to washing was very poor to poor due to a change in color shade after washing, but there was no fading of the color. The color fastness to light varied mostly from a fair to a good level. Color fastness to crocking, perspiration and water ranged from fair to very good, depending on the type of mordants used. Cotton fabric dyed with mangrove bark extract also showed very good to excellent UV protection properties.
Colorimetric Analysis and Fastness Rating of Natural Yellow Color Dyes on Cotton Fabric
Journal of Natural Science and Textile Technology, 2022
Today's environmental concern about the harmful effects of synthetic dyestuffs has arisen in our discourse on the use of natural dyes. Plant dyes are more favorable due to their non-toxicity, non-carcinogenic, non-allergic, and biodegradability over synthetic dyes to human beings. This work is intended to investigate the effects of three different natural yellow shaded dyes on the 100% cotton knit fabric using four kinds of synthetic mordant. A series of experiments were conducted to analyze and compare the results of these three sources of natural yellow dyes. Simultaneous extraction and dyeing methods were found to yield the best hues of yellow dye, as decided by colorimetric tests and visual analysis. The final samples were tested for fastness to light, wash, rubbing and perspiration by following the ISO standards. A significant change was observed in fastness properties and colorimetric analysis on copper sulphate treated turmeric dyed sample.
Dyeing Of Textiles With Natural Dyes - An Eco-Friendly Approach
Numerous plant species are found to have an important role in the day-to-day life of the ethnic and local people. However, it is a matter of concern that the indigenous knowledge of extraction, processing and practice of using of natural dyes has diminished to a great extent among the new generation of ethnic people due to easy availability of cheap synthetic dyes. Thus by keeping in view of above, the present study has been undertaken so as to revive the age-old are of dyeing with natural dyes. In the present work, the flowers of Clitoria ternatea (Clitoria flowers) and Targetes erecta Linn ( Marigold) and Punica granatum ( pomegranate) peel were used for the extraction of dye, dyeing of the selected fabrics at optimized conditions, using combination of mordants and evaluate the resultant colour fastness of the selected dyed samples to washing, rubbing, and light. Also the antimicrobial properties of the dyes were evaluated.
Eco-friendly Dyeing of Cotton Fabric with Natural Colorants Extracted from Banana Leaves
This Work aimed to use pig ments ext racted fro m banana leaves as natural waste source to dye some Egyptian cotton fabrics. Both alkaline and acetone extracted solutions were analy zed by high performance thin layer chro matography (HPTLC) analysis technique. The solutions were applied to the premo rdanted bleached and mercerized cotton fabrics made fro m Giza 86 and Giza 90 cotton varieties. Ferrous sulphate, copper sulphate and potassium dichro mate were used as mordant. The factors affecting the fixation of the ext racted dye with cellulose was studied. The treated and untreated fabrics samp les were tested for their mechanical properties expressed as tensile strength (kg/force) and elongation%. Dyeing performance in terms of color parameters (K/S, L*, a*, b* and ΔE), and fastness properties (wash, perspiration, and light fastness) were studied. The samp les show high tensile strength, high color strength, and high fastness properties. These results are very important for industrial application with the production of a natural dye as an inexpensive source from banana leaves as a by-product. Another objective is to increase the production of eco-textile garments with a good price for the Egyptian customers.