Abstract
Natural dyes are derived from natural sources such as plants, animals and minerals. They are mostly non-substantive and can be applied on textiles materials by using mordants. Synthetic dyes are derived from organic or inorganic compound. They are cheaper, offer a vast range of new colour and impart better properties to textile materials. Synthetic dyes are widely used in industries amongst which textile processing industries are the major consumers. Acid dyes are soluble in water and it can be permanently fixed to the fibre with the addition of a weak acid and heat. A series of acid dyes were synthesized by diazotization of 1-amino-2-naphthol-4-sulphonic acid and coupled with various naphthalene derivatives such as 1-nitroso-2-naphthol, 2-nitroso-1-naphthol, 1-naphthol, 2-naphthol and N, N-dimethyl aniline. Visible absorption spectra of the dyes were examined in distilled water, ethanol and ethanol plus few drop of concentrated hydrochloric acid. The FT-IR analysis was determined to confirm the functional group present in the synthesized dye. The dye was applied on polyamide (Nylon) fabric and the colour parameters of dyed fabrics were examined to have good exhaustion between pH 3–4.5 and more intense. After the dyeing process, the fabric was subjected to washing and light fastness. The remarkable degree of levelness and brightness of the synthesized acid dye on the nylon fabric is of good penetration, excellent affinity and very good fastness properties.
Highlights
Colourant is a term used for dyes and pigments [1]
Synthetic dyes are widely used in the textile, rubber product, paper, printing, colour photography, pharmaceuticals, cosmetics and many other industries, in which textile processing industries are the major consumers
The present study was focused on synthesis of acid dye derived from 1amino-2-naphthol-4-sulphonic acid and their dyeing properties on nylon fabrics
Summary
Colourant is a term used for dyes and pigments [1]. A dye is a water-soluble substance from organic origin that when applied to a substrate provide colour by a process that alters any crystal structure of the coloured substances temporarily [2, 3] while a pigment is a coloured compound which is insoluble and from inorganic in origin [4]. Natural dyes are mostly non-substantive and must be applied on textiles by the help of mordants, usually a metallic salt, having an affinity for both the colouring matter and the fibre [7]. An acid dye is a dye that is typically applied to a textile at low pH. These dyes can be applied to nylon, wool or silk not cotton fabrics in the pH range 3.0–7.0. The water serves to dissolve the dye and dyeing assistants It is absorbed by the fibre itself. The present study was focused on synthesis of acid dye derived from 1amino-2-naphthol-4-sulphonic acid and their dyeing properties on nylon fabrics
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