Synthesis of a Fluorescent Whitening Molecule and its Application to Wool Fibres

2019 ◽  
Vol 16 (2) ◽  
pp. 314-318
Author(s):  
Shazia Abrar ◽  
Kazim Raza Naqvi ◽  
Sadia Javed ◽  
Shumaila Kiran ◽  
Tahsin Gulzar
Keyword(s):  
Reactive Dye ◽  
Hydroxyl Group ◽  
Wool Fibre ◽  
Total Efficiency ◽  
Triazine Ring ◽  
Yellowness Index ◽  
Chloro Group ◽  
High Exhaustion ◽  
Dyeing Method ◽  
Exhaust Dyeing

Aim and Objective: Reactive dye molecules are commonly employed to dye or modify colour characteristics of wool fibres. Yellowness of wool fibres poses a challenge and here, we report synthesis of a reactive fluorescent molecule and its application to wool fibres to reduce yellowness of the wool fibre and improve its colour features. Material and Methods: The new molecule was based upon 7-amino-4-methylcoumarin (AMC) and 2,4,6- trichloro-1,3,5-triazine (TZT). The synthesis involved a two-step chemical reaction, initiated by the nucleophilic substitution of a chloro group on the triazine ring with the hydroxyl group of 4-hydroxybenzenesulfonic acid. The substitution of 2nd chloro group at triazine ring with the amino group of 7-amino-4-methylcoumarin resulted in a novel molecule with a monofunctional reactive chloro group (AMC-MCT molecule). Results: The new molecule was applied to the wool fibres using exhaust dyeing method. This exhibited a high exhaustion value; however low fixation and total efficiency values were observed for the new molecule. The resultant wool fibres exhibited fluorescence which shows that aminocoumarin fluorophore retained its fluorescence when incorporated in the new molecule. An assessment of the molecule for yellowness index in a controlled exposure to UV radiation suggested an improvement in whiteness of wool fibre. Conclusion: A novel aminocoumarin based fluorescent whitening molecule 2 has been synthesised and applied to the wool fibres. The new molecule continued to exhibit fluorescence after its application to the wool fibres. These results will encourage researchers to explore further possibilities for reactive whitening agent for wool fibres.

scholarly journals Using of fluorinated aluminum silicate in the process coloring of textile materials with pigments

2018 ◽  
Vol 80 (2) ◽  
pp. 307-312
Author(s):  
E. L. Vladimirtseva ◽  
L. V. Sharnina ◽  
A. A. Mironova
Keyword(s):  
Water Soluble ◽  
Wool Fibre ◽  
Aluminum Silicate ◽  
Aluminum Fluoride ◽  
Industrial Emissions ◽  
Textile Materials ◽  
Limited Solubility ◽  
Sorption Ability ◽  
Soluble Aluminum ◽  
Exhaust Dyeing

The aim of the work is to search for new drugs and technologies for processing textile materials to achieve high quality products with minimum costs and practical absence of harmful industrial emissions. Studies on the use of insoluble aluminum silicate in practical application in the textile industryare conducted at the Ivanovo State University of Chemical Technology. The experience of using silicates for modifying the properties of wool fibre and purification of exhaust dyeing solutions from direct, active and acidic dyes has been accumulated. The article considers the possibility of using fluorinated aluminum silicate (xAl2O3 * ySiO2 * zAlF3), which is a by-product in manufacture of aluminum fluoride, when coloring textile materials with pigment dyes. The uniqueness of this preparation lies in the fact that fluorinated aluminum silicate combines two fractions: insoluble (silicon and aluminum oxides) and soluble (aluminum fluoride). Aluminum fluoride has a limited solubility in water (0.41% by weight at 25 ° C), but is catalytically active and is used in a number of chemical processes as a catalyst. Due to the presence of water-soluble aluminum fluoride, fluorinated aluminum silicate has an acidic reaction. This powder is finely dispersed and its insoluble part has a white color, so it can be used as filler for blending printing inks and a catalyst for the dye fixing process on the fibre. The color and strength characteristics of the obtained stains convincingly prove that the fluorinated aluminum silicate can successfully replace commercially available catalysts. An additional positive feature is an increase in the shelf life of the finished printed composition. The limited solubility of aluminum fluoride, on the one hand, and its distribution in the structure of insoluble alumina and silicon oxides, on the other, makes the preparation catalytically inactive at room temperature, which positively affects the stability of the ink. Another option for the use of fluorinated aluminum silicate in combination with pigments can be purification of exhaust dyeing solutions. In this case, the high sorption activity of fluorinated aluminum silicate with respect to pigments plays a leading role. If fine dispersed fluorinated aluminum silicate is placed in the aqueous dispersion of the pigment, then, settling, it will capture the dye. Within 24 hours, the dispersion completely discolored. At the same time, the settled powder acquires a pigment tint. The results of the research presented in this paper make it possible to talk about the technological possibilities of using fluorinated aluminum silicate in the coloring of textile materials with pigments in which both its sorption ability and catalytic activity are in demand.

Dyeing of Cotton Fabric with Natural Dye Extracted from Egyptian Cotton Leaves

2021 ◽  
Vol 8 (1) ◽  
Keyword(s):  
Natural Dye ◽  
Fastness Properties ◽  
Light Fastness ◽  
Color Strength ◽  
Cotton Variety ◽  
Dyeing Performance ◽  
Dyeing Method ◽  
Exhaust Dyeing ◽  
Egyptian Cotton ◽  
Good Price

Cotton leaves have been used to extract natural dye for dyeing of Egyptian cotton variety Giza 86 fabric and its blend with polyester 50:50, using different mordants such as iron (II) sulfate, copper (II) sulfate, and alum. The exhaust dyeing method was utilized using the pre-mordant technique. It is observed that both fabric samples can be dyed in different colors and depth of shades with Cotton leaves dye. Iron (II) sulfate ensures the best light fastness. Improved light fastness is obtained using abovementioned lower amounts of iron (II) sulfate and copper (II) sulfate. Alum is found to be less effective than iron (II) sulfate and copper (II) sulfate on the light fastness. As a novel alternative and potential natural dye, Cotton leaves extract solution can be used to get various colors and shades with satisfactory fastness properties. The mordanted and un-mordanted fabric samples were tested for their dyeing performance in terms of color parameters K/S, (L*), a*, b*, (C*) and (H*), and fastness properties (wash, perspiration, light and rubbing fastness) were studied. The samples showed high color strength, and high fastness properties. These results are very important for industrial application and with the production of a natural dye as an inexpensive source from cotton leaves as a by-product. Another objective is to increase the production of eco-textile garments with a good price for the Egyptian customers.

scholarly journals Dyeing of Polyester Fabric with Natural Colorants Extracted from Mahogany (Swieteniamahagoni) Seed Pods

2020 ◽  
Vol 11 (1) ◽  
pp. 37-42
Author(s):  
Md Abdullah Al Mamun ◽  
Mohammad Mamun Hossain ◽  
Mubarak Ahmad Khan
Keyword(s):  
Crude Extract ◽  
Polyester Fabric ◽  
Disperse Dyes ◽  
Color Fastness ◽  
Color Strength ◽  
Uv And Ir Spectra ◽  
Natural Colorants ◽  
Dyeing Method ◽  
Exhaust Dyeing ◽  
Dyed Fabric

Polyester fabric is usually dyed with disperse dyes which has severe limitations specially toxicity and environmental issues. The aim of the present research is to introduce an ecofriendly dyeing process for polyester fabric with natural dyes. The natural colorants were extracted from mahogany seed pods using the simple acid boiling method. The spectroscopic analysis of the crude extract was carried out by UV and IR spectra of the extracted dyes and illuminated the presence of natural tannins as coloring materials in the crude extract. 10g fabric was dyed in 200cc extracted solution at 130⁰C for 60 minutes in exhaust dyeing method followed by neutralization and soaping. Finally, a light brown dyed fabric was obtained. The dyed fabric exhibited color strength in terms of k/s value of 0.63 (λmax 360nm), lightness of 80.565 and chromaticity value of 12.002 CIE units. Different samples were dyed by fluctuating the dyeing period. The dyeing traits of the dyed materials were judged in terms of their color strength and fatness properties. All testes were carried out following the ISO standards. From the results, it is lucid that the dyed fabric showed acceptable color fastness properties in case of all fastness except color fastness to light. It is observed that dyeing time had profound influence on the color strength (k/s value) of the dyed material. The k/s value increases with the increase of dyeing period up to 120 minutes. The maximum color strength (0.76) was noted for the fabric. The shorter dyeing time produces lighter samples and the longer dyeing time produced colorful samples. Journal of Engineering Science 11(1), 2020, 37-42

scholarly journals Dyeing Method and Properties of a Novel Blue Azo-Anthraquinone Reactive Dye on Cotton

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1334 ◽  
Author(s):  
Bin Shan ◽  
Wei Xiong ◽  
Shufen Zhang
Keyword(s):  
Sodium Carbonate ◽  
Reactive Dye ◽  
Light Fastness ◽  
Colored Cotton ◽  
Dyeing Method ◽  
Dipping Time

A novel blue azo-anthraquinone reactive dye was evaluated in the dyeing of cotton by using a dip–pad–steam process. Dyeing method and properties were examined in detail and the results showed that the dyeing method consisting of dye concentration of 25 g/L, sodium carbonate of 12 g/L, dipping time of 3 min and steaming time of 30 min was the most effective when a conventional “one-dip–one-nip” process was used. The fixation of the dyes on cotton could reach up to 93.4%, the wash and rub fastness both reached grade 4 above, and the light fastness reached grade 4–5 above. Such colored cotton showed very close colorimetric properties.

scholarly journals Application of Purified Lawsone as Natural Dye on Cotton and Silk Fabric

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Md. Mahabub Hasan ◽  
Khandakar Abu Nayem ◽  
Abu Yousuf Mohammad Anwarul Azim ◽  
Nayon Chandra Ghosh
Keyword(s):  
Silk Fabric ◽  
Light Fastness ◽  
Lawsonia Inermis ◽  
Color Strength ◽  
Total Extract ◽  
Textile Materials ◽  
Extraction And Purification ◽  
Dyeing Method ◽  
Exhaust Dyeing ◽  
Reddish Brown Color

The color which is obtained from the leaves of Henna, that is, Lawsonia inermis L., is used frequently in hair coloring. It is the chemical lawsone that is responsible for the reddish brown color. Its content makes it a substantive dye for dyeing the textile materials. This work concerns with the extraction and purification of natural dyestuff from a plant Lawsonia inermis L. and dyeing of cotton and silk fabric in exhaust dyeing method. The dye portion is isolated from the total extract by column chromatography and is evaluated by dyeing cotton and silk under different dyeing conditions. The color strength and fastness properties of the dye are undertaken by changing mordant and techniques of mordanting. The changes of colors have been noticed by using different types of mordant. The dye exhaustion percentage, wash, rubbing, and light fastness results reveal that the extract of henna can be used for coloration of cotton and silk fabric.

Eco-friendly salt-free reactive dyeing of cotton (muslin) fabric after cationization with amino acid from soya

2016 ◽  
Vol 86 (20) ◽  
pp. 2179-2192 ◽  
Author(s):  
Ashis Kumar Samanta ◽  
Tapas Ranjan Kar ◽  
Asis Mukhopadhyay ◽  
Debashis Shome ◽  
Adwaita Konar
Keyword(s):  
Amino Acids ◽  
Cotton Fabric ◽  
Reactive Dye ◽  
Reaction Scheme ◽  
Dye Uptake ◽  
Reactive Dyeing ◽  
Chemically Modified ◽  
High Exhaustion ◽  
Natural Amino Acids ◽  
Color Depth

Bleached cotton fabric was chemically modified (cationized)with natural amino acids extract obtained by acid hydrolysis (6N HCL) from soya bean seed waste, adding MgCl2 as an acid donor in the pad-dry-calendaring process to investigate the changes in textile properties and its dyeability with reactive dye in both a conventional alkaline dye bath and salt-free acidic dye bath. This modified cotton incorporates new functional groups producing [Formula: see text] in acid bath to obtain cationized cotton, rendering it to eco-friendly salt-free reactive dyeing at acceptable shade depth without much sacrifice of other textile-related properties. Bi-functional high exhaustion-type reactive dye shows better dye uptake than mono-functional cold brand as well as hot brand reactive dye. Moreover, the application of a specific dye fixing agent further improves surface color depth ( K/ S) of the soya-modified cotton fabric. The study of surface morphology of said chemically modified cotton substrate indicates a higher degree of surface deposition, that is, more anchorage of soya extracted amino acids on cotton fabric. Chemical anchorage as per the reaction scheme postulated for such modifications is verified with Fourier transform infrared spectroscopy. Finally, it is revealed that cotton treated with soya extract provides a new route of eco-friendly salt-free reactive dyeing with high exhaustion-type reactive dyes showing much higher dye uptake than the control cotton fabric.

scholarly journals Prediction of low-sensitivity reactive dye recipe in exhaust dyeing influenced by material to liquor ratio and nature of salt

2012 ◽  
Vol 16 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Mansoor Iqbal ◽  
Zeeshan Khatri ◽  
Aleem Ahmed ◽  
Javaid Mughal ◽  
Kamran Ahmed
Keyword(s):  
Reactive Dye ◽  
Liquor Ratio ◽  
Exhaust Dyeing ◽  
Low Sensitivity

Investigation into the Blocking Effect of Reactive Dye Combinations in Exhaust Dyeing of Cotton

2012 ◽  
Vol 610-613 ◽  
pp. 569-572
Author(s):  
Potjanart Suwanruji ◽  
Rakchanok Sidarkote ◽  
Jantip Suesat
Keyword(s):  
Reactive Dye ◽  
Blocking Effect ◽  
Reverse Order ◽  
Reactive Black 5 ◽  
Reactive Groups ◽  
Exhaust Dyeing

The blocking effect of reactive dye combinations during the exhaust dyeing of cotton was studied using C.I. Reactive Yellow 176, C.I. Reactive Red 239 and C.I. Reactive Black 5. In the exhaust dyeing of binary reactive dye combinations, reverse order of dyeing was carried out at the dye concentration of 1%owf. After the shade of dyed cottons were evaluated, we found that the combination of C.I. Reactive Yellow 176 and C.I. Reactive Black 5 exhibited a blocking effect. The blocking took place readily in the dyebath. Therefore, C.I. Reactive Blue 250 was used to replace C.I. Reactive Black 5 because of the similarity of their chromophores and reactive groups. The results showed less blocking effect, indicating low interaction between the dyes in the combination.

scholarly journals Chemical Modification on Reactive Dye Adsorption Capacity of Castor Seeds

2011 ◽  
Vol 8 (s1) ◽  
pp. S335-S343 ◽  
Author(s):  
V. Dharmalingam ◽  
A. K. Ramasamy ◽  
V. Balasuramanian
Keyword(s):  
Functional Groups ◽  
Functional Group ◽  
Dye Adsorption ◽  
Reactive Dye ◽  
Neutral Red ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Anionic Dyes ◽  
Cresyl Blue ◽  
Castor Seeds

Abstract: The roles played by four major functional groups (amine, carboxyl, azo, hydroxyl groups) in the biomass of castor seeds in adsorption of seven dyes were investigated. These functional groups in castor seeds were chemically modified individually to determine their contribution to the adsorption of ionic dyes. The dyes used were remazol red B, procino yellow, fast green FCF, brilliant cresyl blue, methylene blue, neutral red, red-141. It was found that hydroxyl group inhibited the adsorption of anionic dyes but it was major functional group in the adsorption of cationic dyes, hydroxyl group was important functional group in the adsorption of all seven dyes and the effect of methylation of amino group was not significant on the adsorption of seven dyes.

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