Good Colour Strength Research Articles

Synthesis and application of bifunctional reactive dyes pyrazolo[1,2‐a] pyrazole 3‐carboxylic acid

Purpose – The purpose of this paper is to synthesise, characterise and find out properties of some new bifunctional reactive azo dyes using pyrazolo[1,2‐a]pyrazole 3‐carboxylic acid fused systems as the chromophoric moiety, bearing good colour strength, lightfastness, and other favourable properties.Design/methodology/approach – The dyes are synthesised by diazotisation, coupling and cyclisation reactions. Firstly, synthesised 4‐arylazo‐1,5‐dioxopyrazolo[1,2‐a]pyrazole 3‐carboxylic acid chromophoric moieties and coupled with diazonium salts having the aforementioned reactive groups, thus yielding the new target reactive. The synthesised dyes were applied to cotton and wool fabrics under the typical exhaust dyeing conditions and their dyeing properties were investigated. The structures of these dyes are characterised and confirmed by melting point, elemental analysis, infrared, ultraviolet‐visible spectroscopy (UV/VIS) and nuclear magnetic resonance (1H‐NMR) data.Findings – The wavelength of maximum absorp...

Water-based Pigment Inks for Textile Printing

A set of water-based, pigment inks with binder was formulated for ink-jet printing onto textiles. The inks formulated have good color strength for printing onto various fabrics such as cotton, cotton blends, polyester etc. with heat curing at 160 C for 2-3 mins. The ink formulations were optimized to adress the needs of reliably printing with ink jet print heads and the textgile print properties. In additions to process colors, spot colors (Red, Green, Blue, Orange and Violet) and tone colors (LC, LM and Gray) were formulated to capture variety of applications. The inks were tested for reliability using Epson desktop and wide format printers. The print properties were tested on both prepared and unprepared fabrics to see the impact of commercially available pre-treatment on print properties. Results are shared and recommendations made to obtain the print properties needed.