Basic Dye (Full PDF) | Basic Dye

Basic Dye (Full PDF) | Basic Dye Sheet

1. Basic Dye Basic dyes are called so since they are salts of organic bases. Basic dyes are also called cationic dyes because in solution the basic dye molecule ionizes, causing its colored component to become an action of positively charged radical. Basic dyes are used for dyeing wool, silk, and acrylic and mod-acrylic fibres .

2. Properties of Basic Dyes Basic Dyes are cationic soluble salts of colored bases. Basic dyes are called cationic dyes because the chromophore in basic dye molecules contains a positive charge. Basic dyes are readily soluble in alcohol or mentholated spirit . Basic dyes can be removed from the material by boiling it with dilute acetic acid or hydrochloric acid.

3. Ionic nature : The ionic nature of these dyes is cationic . Shade range: These dyes exhibit an unlimited shade range with high tinctorial strength, brightness and many colors are having fluorescent properties. Solubility :- The solubility of these dyes is very good in water in the presence of glacial acetic acid. Leveling properties:- These dyes have a very high strike rate , therefore leveling is poor.

4. Affinity: These dyes shows a very affinity towards wool , silk and cationic dye able acrylic, but have no affinity towards cellulosic. To dye cellulosic with basic dyes the material must be treated with suitable mordanting agents . Fastness Properties:- The light fastness is poor to moderate , but wet fastness is good.

5. Advantages of Basic Dyes •High Tinctorial strength •Moderate substantivity •Relatively economical •Wide shade range •Includes some of the most brilliant synthetic dyes •Shows good brightness

6. Limitations of Basic Dyes *Poor shade stability *High acid content *Colored backwaters *Very poor light fastness

7. Modified Basic Dyes These dyes, generally based on the chemistry of basic dyes, have longer molecular structures than traditional basic dyes, and thus have significantly improved properties. Though still cationic in nature, modified basic dyes exhibit improved fiber coverage and substantivity on many furnishes making them ideal for dyeing applications. Light fastness is also improved considerably over traditional basic dye.

8. Key advantages over conventional basic dyes:- Excellent substantivity •Better Light fastness •Covers all fibers •Clear backwaters