Abstract
Nitrosonaphthol dyes and other corresponding analogues were synthesised from 1-Naphthol. The dyes were applied onto chrome and vegetable tanned leather upon characterization. The results indicate that the dye bath exhaustion was better on chrome tanned leather than on vegetable tanned leather. This may be attributed to the chelating effect of chrome on leather and the higher temperature of dyeing the chrome tanned leather compared with the vegetable tanned leather. The fastness properties of the dyes of washing ranging from (3 - 5), perspiration on acid (4 - 5), alkaline (4 - 5) and light (4 - 7) were impressive on both vegetable and chrome tanned leather respectively.
Highlights
Leather is dyed to improve its appearance and make it saleable in a finished form
How to cite this paper: Ameuru, U.S, et al (2014) Synthesis and Characterization of Nitrosonaphthol Dyes Based on 1-Naphthol and Their Dyeing Properties on Tanned Leather
Nitrosonaphthol dyes have been found to be suitable for dyeing tanned leather by exhaustion process due to the presence of nitroso-hydroxyl compounds that are an example of a system that possess an intramolecular hydrogen bond
Summary
Leather is dyed to improve its appearance and make it saleable in a finished form. Some colours may be imparted by the tanning agent, but usually this is supplemented with synthetic dyes and/or pigments. Nitrosonaphthol dyes have been found to be suitable for dyeing tanned leather by exhaustion process due to the presence of nitroso-hydroxyl compounds that are an example of a system that possess an intramolecular hydrogen bond. They are the key regents in the production of azo dyes. Since they are good chelating agent [3], they have found a place in many analytical [4], synthetics [5] and other applications [6] [7]. Light and perspiration fastness properties on the tanned leathers are studied
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