scholarly journals INVESTIGATION OF INDIGO DYEING USING SODIUM BOROHYDRIDE AS REDUCING AGENT

2017 ◽  
Vol 5 ◽  
pp. 1061-1063
Author(s):  
Banu YeĹźim Buyukakinci ◽  
Nihal Sokmen
Keyword(s):  
Cotton Fabric ◽  
Sodium Borohydride ◽  
Reducing Agent ◽  
Fastness Properties ◽  
Sodium Hydrosulfite ◽  
Color Yield ◽  
The World ◽  
Indigo Dyeing ◽  
Blue Jeans ◽  
Textile Sector

Indigo, one of the oldest dyes, has a very important role for the textile sector. It is primarily used to dye cotton clothes, and blue jeans and over one billion pairs of jeans around the world are dyed blue with indigo. Although Sodium Hydrosulfite (Na2S2O4) is used as a reducing agent in most indigo dyeing processes, it is environmentally unfavorable because of the resultant contaminated toxic wastewater. In addition, the color fastnesses of dyed samples using Na2S2O4 as reducing agent are not good enough.In the present paper sodium borohydride (NaBH4) were used as ecologically safe reduction systems for the indigo dyeing of cotton fabric. After dyeing processes, the color yield and fastnesses according to washing and rubbing were measured, and results were compared.It was found when NaBH4 was used as reducing agent instead of Na2S2O4, the color yield and the fastness properties of the dyed samples improved.

Chitosan as a Thickener for Direct Printing of Natural Dye on Cotton Fabric

2012 ◽  
Vol 610-613 ◽  
pp. 3394-3397 ◽  
Author(s):  
Jiraporn Choomchit ◽  
Jantip Suesat ◽  
Sae Be Porntip
Keyword(s):  
Sodium Alginate ◽  
Cotton Fabric ◽  
Natural Dye ◽  
Color Fastness ◽  
Fastness Properties ◽  
Direct Printing ◽  
Chitosan Concentration ◽  
Color Yield

Development of chitosan as a thickener for direct printing of natural dye on cotton fabric was investigated. Chitosan was applied as a thickener at various concentrations and its effect on the print properties was determined in comparison with the typical printing thickener, sodium alginate. The results exhibited that chitosan affected the fabric properties by increasing fabric yellowness and stiffness. However, with increasing chitosan concentrations, the yellowness reduced only marginally. Direct printing on cotton fabric with 3% Natural Chestnut at varying chitosan concentrations showed that the optimum chitosan concentration for the printing was at 3%w/v, being equivalent to the viscosity of 17,800 mPa. The 3%w/v chitosan imparted the ultimate color yield, print outline sharpness and a minimal dye bleeding on the unprinted area of the fabric. Use of chitosan concentration higher than 3%w/v led to poor print properties on the fabric. The efficiency as a thickener of chitosan was found to be superior to sodium alginate. A high color yield and good color fastness properties on cotton fabric were rendered in the case of chitosan thickener at the same applied concentration with sodium alginate.

scholarly journals REACTIVE DYE PRINTING ON COTTON FABRIC USING MODIFIED STARCH OF WILD TARO CORMS AS A NEW THICKENING AGENT

2021 ◽  
Vol 55 (9-10) ◽  
pp. 1119-1129
Author(s):  
RATTANAPHOL MONGKHOLRATTANASIT ◽  
◽  
CHAROON KLAICHOI ◽  
NATTADON RUNGRUANGKITKRAI ◽  
◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Screen Printing ◽  
Reactive Dye ◽  
Modified Starch ◽  
Color Fastness ◽  
Fastness Properties ◽  
Carboxymethyl Starch ◽  
Thickening Agent ◽  
Stiffness Properties ◽  
Color Yield

This study investigated the use of a thickening agent derived from modified starch of wild taro corms in the screen printing of cotton fabric using reactive dye. The best conditions for developing the print paste and steaming time in order to obtain maximum color yield were established. The results revealed impressive color fastness properties in the printed samples; although, the printed fabric possessed slightly lesser tensile and tear strength, in comparison with the unprinted fabric. The printed fabric also exhibited increased bending stiffness properties. Largely, this study reveals that the printing paste containing the thickening agent derived from carboxymethyl starch within wild taro corms can be utilized in the printing of cotton fabric using reactive dye.

Optimized Vatting Condition Study for Natural Indigo Dyeing on Silk Yarn

2014 ◽  
Vol 535 ◽  
pp. 749-752
Author(s):  
Suchada Ujjin ◽  
Jantip Setthayanond
Keyword(s):  
Reducing Agent ◽  
Fastness Properties ◽  
Color Strength ◽  
Optimum Ph ◽  
Different Temperatures ◽  
Indigo Dyeing ◽  
Indigo Dye ◽  
Short Time ◽  
Indigofera Tinctoria ◽  
Silk Yarn

This research studied the optimized dyeing conditions for natural indigo dye (Indigofera tinctoria) on silk yarn. Vatting of natural indigo dye was investigated under different temperatures and times and the natural dyeing auxiliaries were used i.e. tamarind and ash solutions. The results informed the optimum vatting condition for the indigo dye at 90°C for 30 minutes and the optimum pH was 12. The sugars in tamarind solution was expected to work as a reducing agent for dye vatting whereas the ash solution derived from banana barks was used as an alkalinity controller. Dyeing silk yarns with leuco indigo dye under a short time (5 minutes) provided a complete dye distribution with satisfactory color strength on silk and very good fastness properties.

Indigo Dyeing of Cotton using Alkaline Catalase and Additives

2020 ◽  
Vol 7 (1) ◽  
pp. 1-8
Author(s):  
J.N. Chakraborty ◽  
Pranav Mazumdar
Keyword(s):  
Reduction Potential ◽  
Reducing Agent ◽  
Attenuated Total Reflectance ◽  
Color Strength ◽  
Surface Color ◽  
Sulfate Reducing ◽  
Sodium Hydrosulfite ◽  
Indigo Dyeing ◽  
Harmful Effects ◽  
By Products

Sodium hydrosulfite is universally applied as a reducing agent for the reduction of indigo, but also produces hazardous by-products viz. sulfate, sulfite, and thiosulfate ions with harmful effects on the environment due to their toxicity, as well as corrosive effects on the waste lines. To overcome these problems, use of an ecofriendly reducing agent, viz. alkaline catalase, along with iron (II) sulfate, was used in place of sodium hydrosulfite for dyeing of cotton with indigo. Dyed samples were characterized by attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy and scanning electron microscopy (SEM). The alkaline catalase with iron (II) sulfate reducing system produced the same reduction potential in dyebaths, reduction bath stability, surface color strength, and color fastness properties of dyed cotton compared to sodium hydrosulfite use.

Optimization of Vat Dyeing with an Orange Peel Extract Reducing Agent using Response Surface Methodology

2020 ◽  
Vol 7 (1) ◽  
pp. 1-9
Author(s):  
Mohammad Tajul Islam ◽  
Nur-Us-Shafa Mazumder ◽  
Syed Asaduzzaman
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Cotton Fabric ◽  
Orange Peel ◽  
Sodium Dithionite ◽  
Reducing Agent ◽  
Color Yield ◽  
Dyed Fabric ◽  
Orange Peel Extract ◽  
Peel Extract

Sodium dithionite is the most commonly-used reducing agent for vat dyeing of cotton fabric. This research focuses on the use of orange peel extract (OPE) as a new reducing agent for vat dyeing cotton fabric to avoid the toxic chemicals released from sodium dithionite. The dyeing experiments were carried out in a batch system to optimize alkali concentration, OPE concentration, and vatting temperature via response surface methodology (RSM). The optimal color yield was achieved at 11.97 g/L of OPE, 1.18 g/L of alkali, and 44 °C vatting temperature. Fabric dyed under optimized dyeing condition using OPE was compared with a standard conventionally dyed fabric using sodium dithionite as the reducing agent. A uniformly dyed fabric with comparable color yield was obtained. Fastness properties were not affected by the use of OPE.

scholarly journals ECO-FRIENDLY DYEING OF COTTON FABRIC WITH WASTE TEA LEAVES BASED TANNIN NATURAL DYE

2021 ◽  
Keyword(s):  
Cotton Fabric ◽  
Cotton Fabrics ◽  
Microwave Energy ◽  
Natural Dye ◽  
Fastness Properties ◽  
Environmental Standards ◽  
Tea Leaves ◽  
Green Technologies ◽  
Color Yield ◽  
Waste Tea

<p>Natural products have always been appreciated due to the awareness about environmental standards for global health by using green technologies in their isolation and extraction. Thereupon natural dyes have been used in all fields due to having ecofriendly, therapeutic and aesthetic nature. For the current study, microwave radiations (MW) have been used as a green extraction tool to explore the natural coloring potency of Tea leaves for the dyeing of cotton fabrics. For isolation of natural dye from tea leaves in aqueous and basic media MW irradiation for 1-6 min has been given and used to dye cotton fabric. It has been evaluated that an increase in color yield (K/S) with the use of 6 min of microwave energy when basic extract of tea leaves was used to dye onto cotton fabric. It has been also revealed that in the case of the pre-mordanting method, 6% of Cu and 8% of Fe as a post mordanting method give the best fastness properties and the highest color yields. It is concluded that MW energy has an excellent ability for isolation of colorant from Tea leaves for dyeing of cotton fabric under reduced optimal dyeing conditions.</p>

Sodium borohydride: A versatile reagent in the reductive N-monoalkylation of α-amino acids and α-amino methyl esters

2002 ◽  
Vol 80 (7) ◽  
pp. 779-788 ◽  
Author(s):  
Giancarlo Verardo ◽  
Paola Geatti ◽  
Elena Pol ◽  
Angelo G Giumanini
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Sodium Borohydride ◽  
Carbonyl Compounds ◽  
Condensation Reaction ◽  
Methyl Esters ◽  
Reducing Agent ◽  
Reductive Condensation ◽  
Versatile Reagent

α-Amino acids and α-amino methyl esters are easily converted to their N-monoalkyl derivatives by a reductive condensation reaction using several carbonyl compounds in the presence of sodium borohydride. This reducing agent has shown a wide versatility with minor but essential procedural variations. The reaction allows the α-monodeuterium labeling of the new N-substituent by use of sodium borodeuteride.Key words: α-amino acid, α-amino methyl esters, sodium borohydride, reductive N-monoalkylation, carbonyl compounds.

Chemistry of the aminochromes. Part XI. Studies on 2-methylaminochromes

1969 ◽  
Vol 47 (11) ◽  
pp. 2003-2007 ◽  
Author(s):  
O. Hutzinger ◽  
R. A. Heacock
Keyword(s):  
Acetic Anhydride ◽  
Sodium Borohydride ◽  
Silver Oxide ◽  
Potassium Iodate ◽  
Sodium Hydrosulfite

2-Methyladrenochrome and 1-ethyl-2-methylnoradrenochrome have been prepared by oxidation of 3,4-dihydroxyephedrine and 3,4-dihydroxyhomoephedrine with silver oxide. The corresponding 7-iodoaminochromes were obtained when the oxidations were carried out with potassium iodate. The expected 3,5,6-triacetoxyindoles were formed by treatment of these aminochromes with acetic anhydride and pyridine and the corresponding 5,6-dihydroxyindoles (isolated as their diacetyl derivatives) were obtained by reduction of the aminochromes with sodium borohydride or sodium hydrosulfite. An improved procedure for the synthesis of 3,4-dihydroxyephedrine (α-methyladrenaline) is also described.

scholarly journals A Comparative Study on Dyeing Properties of Hemp and Cotton Fiber

2017 ◽  
Vol 13 (33) ◽  
pp. 378 ◽  
Author(s):  
Shekh Md. Mamun Kabir ◽  
Rezaul Karim ◽  
Khayrul Islam
Keyword(s):  
Comparative Study ◽  
Cotton Fabric ◽  
Cotton Fiber ◽  
Reactive Dye ◽  
Woven Fabrics ◽  
Fastness Properties ◽  
Dyeing Properties

In this study, a mixed bi-functional reactive dye was applied to the cotton and hemp woven fabrics. Their dyeing and fastness properties were compared. From the results, it was observed that the cotton fabric exhibits better exhaustion and levelness than hemp woven fabrics. The build-up and fastness properties of the two woven fabrics appeared to be almost similar.

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