Reactive dye

Some dyes function in liquid form—such as soluble dyes—yet are chemically synthesized.
Processes involving dispersion and enhanced solubility within the system influence the dye’s molecular structure, resulting in specific performance characteristics.
These dyes offer high wash fastness and good light fastness—factors considered to be of significant importance.

Certain formulations involve both non-ionic and ionic dyes, which must be properly applied to ensure the desired outcome and durability. Non-ionic dye series are suitable for various types of fibers, such as nylon, acrylic, and cotton.

In some instances, these materials serve as yellow dyes and provide stable performance.

Chemical differences among some of these:

These substances belong to the category of reactive salts or amino-compounds. In some instances, electrodes and orbital energy are utilized, while in others, low energy consumption is involved.
The effects of this group on dye solutions are rapid and consistent.

Category:
Chemical structure of some of these polymers

Classification of some Polynor resins based on the type of active group:

✓ Nitrate-based paints

Nitrate-ester molecules exhibit high chemical reactivity; therefore, the dyeing process for polyester fibers is carried out at temperatures of 85–90°C.

✓ Polyester paints

Polyester molecules possess high chemical reactivity; consequently, high temperatures cause the dye to degrade. These dyes exhibit good transparency. Dyeing temperatures for this class typically range from 85°C to 90°C. These dyes are utilized in new color applications. Regarding the alkali levels used for this class…
(pH = 10,10)

✓ Oil-based and Sulfan-based colors

Direct dyes constitute the counterpart to this category of dyes.

Direct dyes: These are generally dyes that exhibit sensitivity to light intensity.
Due to low molecular activity, this category shows poorer fastness to washing and light.

Physical properties:
Some direct dyes penetrate fibers and become fixed within them through the action of dispersing agents.
2. They are typically applied at high temperatures.
3. These dyes are suitable for cotton, viscose, and cellulosic fibers.
4. This category is not suitable for nylon.

Advantages of direct dyes:
Good affinity for cellulosic fibers, low cost, and ease of use.

Disadvantages of direct dyes:
Poor wash fastness, moderate light fastness; fixation is enhanced by salt.