Abstract
27May 2019 SYNTHESIS AND STUDY OF DYEING PROPERTIES OF HETEROCYCLIC DISPERSE DYES DERIVED FROM 2- AMINOBENZOTHIAZOLE. Hadiza Jibril Abdullahi. Federal college of education (technical) bichi school of science education department of chemistry p.m.b 3473.
Highlights
Monoazo heterocyclic disperse dyes were synthesized from 2- Amino benzothiazole by diazotization of 2- Aminobenzothiazole and coupling with 1-Naphthylamine, 1- Naphthol and 2-Napthol.The synthesized dyes were applied to nylon, polyester and acrylic fabrics by Drapkira’s
It was observed that these dyes have high wash fastness for the fabrics while their fastness to light is poor and they all absorbed at the visible region of the spectrum
From the results shown in table 1, dyes derived from 1-Naphthol and 2- Naphthol have same molecular weight and melting point temperatures of 700c while the dye derived from 1- Naphthylamine has the highest melting point temperature of 180’C which could be attributed to the nature of the substituent groups
Summary
Monoazo heterocyclic disperse dyes were synthesized from 2- Amino benzothiazole by diazotization of 2- Aminobenzothiazole and coupling with 1-Naphthylamine, 1- Naphthol and 2-Napthol.The synthesized dyes were applied to nylon, polyester and acrylic fabrics by Drapkira’s. The discovery of disperse dyes was made in 1924 by James Badiley and Holland Ellis but due to their lack of substantivity for natural fibers, their chemistry developed in 1950s, when secondary cellulose acetate and polyester came in to existence Their use is primarily for synthetic fibers such as nylon, acrylics, polyester, cellulose acetate and for thermoplastics[1].Dyes possess color because a. [5] These dyes are generally applied in the form of dispersions in an aqueous medium at a temperature above the boil in an enclosed pressurized dyeing machine or by the use of carrier. The heterocyclic ring may consist of carbon atoms together with either S, O or N They generally possess good dyeing properties and good fastness properties to wash and light .They had special properties like heterocyclic sulphur compounds which have thermal stability while 5-hydroxy benzimidazoles possessed antioxidant properties. Diazotization reaction; is the reaction of a primary aromatic amine with a nitrous acid in the presence of excess acid to produce diazo compound represented by the equation Ar-NH2 + HX + HNO2 — > Ar-N=N-X + 2H2O
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