Book Description
What is a Basic Dye?
Basic dyes are called as they are organic base salts. Basic dyes are likewise called cationic dyes because basic dyes molecule ionizes in solution. Basic dyes are utilized for dyeing wool, silk, acrylic and mod-acrylic fibres.
Characteristics of Basic Dyes
Ionic nature:The ionic nature of basic dyes is cationic.
Shade range:These dyes display a limitless shade range with high tinctorial strength and brightness.
Solubility:The solubility of basic dyes is generally excellent in water, in the presence of glacial acetic acid.
Affinity:These dyes show affinity towards wool, silk and acrylic, however have no affinity towards cellulosic. To dye cellulosic with basic dyes, the material should be treated with mordanting agents.
Fastness properties:The light fastness is poor to average, yet wet fastness is poor.
Benefits of Basic Dyes
High tinctorial strength Moderate substantivity Relatively affordable Wide shade range Includes some of the brilliant synthetic dyes Shows great brightness
Key benefits over conventional basic dyes
Excellent substantivity Better lightfastness Covers all fibres Clear backwaters
Properties of Basic Dyes
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The characteristics of the basic dyes are the brilliance and intensity of their colors.
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The bright colors accomplished from basic dyes do not typically happen with other dye classes.
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Most of the basic dyes are soluble in water.
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The glacial acetic acid helps to dissolve the basic dyes quickly in water.
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Basic dyes are promptly soluble in alcohol or mentholated spirit.
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The basic dyes are poor fastness to light and differ for washing fastness from poor to average.
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The wet fastness of the basic dyes on protein fibres can likewise be improved by back tanning. This comprises treating the dyed material with tannic acid to form the insoluble complex accordingly reducing the tendency to move.
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The basic dye will combine with direct or sulphur or acid dyes, so they can’t be utilized together in the same bath. In any case, basic dyes are utilized after treating cotton or other materials dyed with direct dyes. Here the direct dyes act as mordant.
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Most of the basic dyes when treated with a reducing agent, get converted into their colourless leucon compounds and return to their original colour by oxidizing agents or by exposure to air.
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Basic dyes are removed from the material by boiling it with dilute acetic acid or hydrochloric acid.
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Basic dyes are utilized for woollen products when bright shades are required which cannot be acquired with acid dyes.
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Basic dyes are utilized for making inks and dyeing leather.
You may also read:-
What Are The Properties Of Acid Dyes?
Features And Applications Of Solvent Dyes
What Are The Properties Of Sulphur Dyes?
