Reactive dyes are easy to mix in water. These dyes have suphonic acid groups and reactive groups like dichloride or monochloro tniazinyl groups etc. Reactive dyes manufacturers India will explain properties and types of reactive dyes available at their store.
Reactive dyes create covalent bond with the fiber and become a part of it. Such dyes have some reactive group that can react with –OH cellulose group, and –NH2 protein fiber group.
Why reactive dyes are important stuff?
Reactive dyes are crucial product that is used for many fabrics. These dyes are known for their properties. Let’s learn about them:
- During the dyeing process, it is the reactive group of the dye that makes covalent bond with the fiber
- Reactive dyes are water soluble
- These dyes are usually applied for dyeing cellulose and protein fibers
- The process of dyeing is performed under alkali condition
- Wet fastness is well
- The rubbing and brightness fastness are well
- Reactive dye cost is inexpensive
- Dyeing process done with reactive dye is easy
Use of reactive dyes for fibers:
- Protein fiber
Protein fibers are natural polyamides containing several amino acids as building blocks. Amino groups or carboxylic groups present on the polymer chain or in side chains. Protein fibers include wool, silk, cashmere, and mohair. Wool and silk are dominant in this fiber class.
The name of the protein in wool is known as keratin. Keratin protein has numerous groups that are easy to combine with reactive dyes. Reactive dye is easy to apply on wool than silk because there is a higher percentage of basic wools group. And silk includes no sulphur.
Manufacturers of reactive dyes still have to find out specialized composition or formula for silk. However, you can use all the reactive dyes for coloring silk.
There are four methods of application of reactive dyes:
- Batch wise
- Semi continuous
Batch wise or exhaust dyeing process is done on the fiber using neutral or weakly acidic conditions before coming to the fixation step.
Semi continuous is the traditional method in which dyestuff is added along with electrolyte to the bath below the fixation temperature and later increasing the temperature to fixation point before adding alkali.
Continuous dyeing process offers economic advantages if there is a bulk amount of fabric to be colored with limited range of colors.
Printing is done with blocks. It is just like stamping the design using different colors and stamps.
Reactive dyes manufacturers India have widest range of colors and you can get them at best prices. Contact them and share your requirements today.