Properties of dyes pdf

Table 6 lists the major dye classes, fixation rates, and the types of fibers for which they have an. Sources, chemistry, application and sustainability issues sujata saxena and a. Basic dyes basic dyes are applied mainly to aaylic fibers such as types 42 and 75 orlon and type 61 creslan, to produce bright and deep shades with good light and wash fastness. They are widely used in the textile, pharmaceutical, food, cosmetics, plastics, paint, ink, photographic and paper industries. Then we pointed out some chemical properties of these dyes such as reactivity, isomerization and tautomerism and listed. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. The properties of dyes are based on the following factors. The bright colors achieved from basic dyes do not usually occur with other dye classes. Shade brightness or dullness fastness requirements. However, cationic dyes can be used to dye protein fibres and, in fact, the first synthetic dye mauveine was a basic dye that was used for dyeing silk. Basic dyes properties of basic dyes textile learner. Ease of application, durability of color, and resistance to sunlight and chemicals are important properties that are considered when selecting a dye for use. Many of the basic dyes are sparingly soluble in water. The primary classification of dyes is based on the fibers to which they can be applied and the chemical nature of each dye.

Dyes and pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Pdf classifications, properties and applications of. The fibres most readily coloured with reactive dyes are natural and man made cellulosic fibres, natural protein fibres and polyamide fibres. These dyes are economical dyes and are generally used to produce dark shades such as dark greens, dark blues and blacks. These dyes have good leveling and color fastness properties. Introduction of mordant dye properties of mordant dyes. With some reactive dyes, the dyeing can be carried out at room temperature. Textile dyes are grouped into different groups according to their chromophores such as azo, nitro, indigoid, anthraquinone, phthalein, triphenyl methyl, and nitroso 1. Properties of fluorescent dyes and quenchers last update. Dyes and pigments are the most important colorants used to add a color or to change the color of something. Types of dyes classification based on chemical structure. These dyes have no affinity for polyester, cellulosic, or polyamide polymers, since such substrates cannot form an ionic bond with them. Their structure and properties dyes and pigments are the most important colorants used to add a color or to change the color of something. The outstanding characteristics of the basic are brilliance and intensity of their colors.