Properties and Advantages of Azoic Dye - Textile Chapter.
The azoic dyes are synthetic, which means that they are not produced from the natural products. There are other dyes, referred to as the natural dyes, which came before the synthetics. These were produced from the natural dyestuffs such as roots and flowers. They would have some very complex changes when it came to the reproduction of the colors.
INTRODUCTION Para-nitrobenzeneazoresorcinol dye and methyl orange belong to a class of dyes known as “azo colors” which contain the azo group linked to two aromatic nuclei.
A review of the literature on the chemical structure of the textile dyes. characteristics associated with the production and use of textile dyes throughout the world. application of these dyes in the textile industry. Keywords: Chemical structure of the textile dye and use of textile dyes.
Such a classification would include direct dyes, reactive dyes, vat dyes, disperse dyes, azoic dyes, and several more types. These classifications are more suited to a book aimed at the technology of the application of dyes to a substrate rather than one dealing primarily with the synthesis and chemistry of dyes.
Among the synthetic dyes released in effluents from textile industries, azo dyes is one of the more detrimental classes because it is highly persistent in the aquatic environment, due to its.
Dye - Dye - Dyeing techniques: Direct, or substantive, dyes are applied to the fabric from a hot aqueous solution of the dye. Under these conditions, the dye is more soluble and the wettability of natural fibres is increased, improving the transport of dye molecules into the fabric.
Dyes designed for cellulosic polymers are direct, azoic, vat, sulfur, and reactive dyes. Direct dyes are so named because they were the first colourants that had affinity for cotton in the absence of a binding agent known as a mordant. Because these dyes are water-soluble, many have low wet fastness.
Azoic Dyes These dyes are used primarily for bright red shades in dyeing and printing since most other classes of fast dyes are lacking in good red dyes. Azoic dyes, called Naphthols in the industry, are actually manufactured in the fabric by applying one half of the dye.
Azoic Color is called Ice Color or magic color because it needs low temperature and after coupling color is produced within few seconds. Color fastness properties are good to excellent. Properties of Azoic Color: Properties of Azoic Color is given below: Azoic Color is a water insoluble dye. Azoic Color is composed of two components; such as.
By far the greatest source of dyes has been from the plant kingdom, notably roots, berries, bark, leaves and wood, but only a few have ever been used on a commercial scale. Different dyes Classification of Dye According to Application 1. Reactive Dyes 2. Acid Dyes 3. Premetallized Dyes 4. Direct Dyes 5. Azoic (Napthol) Dyes 6. Disperse Dyes 7. Vat Dyes 8.
Dyes: Chemistry and Applications. 8.3 Classification of Dyes 261 8.4 Textile Fibers 268 8.5 The Application of Dyes 272 8.6 Intermediates 274 8.6.1 Miscellaneous reactions 285 8.7 Manufacture of Dyes 286. bluish red azoic dye from the following two components is an example (5). Basic (cationic) dyes. Basic dyes are water-soluble and.
CLASSIFICATION OF DYES Table 8.1. Application Classification of Dyes Class Principal substrates Method of application Chemical Types Acid Nylon, wool, silk, paper, inks, and leather Usually from neutral to acidic dyebaths Azo(including premetalized), anthraquinone, triphenylmethane, azine, xanthene, nitro and nitroso Azoic components and.
A simple sequential scheme to classify dyes based on the degree of extraction of direct, vat, azoic, reactive and sulphurdyes from cotton fibres is described. Five solvent systems were used and observations of the degree of extraction and sub-sequent colour changes with each solvent were used to develop the scheme.
