Chemistry of dyes and pigments [ Note-1]

Pigment in textiles refers to a type of colorant that is applied to fabrics or fibers to give them a particular color or hue. Unlike dyes, pigments are insoluble in water and are usually bonded to the surface of the fabric or fiber using a binding agent or adhesive.

Important Chemical Chromophores of Dye ClassesDownload

Pigments are commonly used in textile printing, where they are applied to the surface of the fabric using a variety of techniques such as screen printing, block printing, or roller printing. Pigments can also be added to the fibers themselves during the spinning or manufacturing process, which is known as solution dyeing or mass pigmentation.

Pigments offer several advantages over other types of colorants, such as dyes. They are often more resistant to fading and can be applied to a wider range of fabrics and fibers, including those that are synthetic or blended. Pigments are also generally easier to work with and require less water and energy to produce, making them a more environmentally friendly choice.

what is disperse dye ?

Disperse dyes are a class of synthetic dyes that are primarily used for coloring synthetic fibers such as polyester, nylon, and acetate. Unlike natural fibers such as cotton or wool, synthetic fibers are made from petrochemicals and do not readily absorb water or water-soluble dyes.

Disperse dyes are designed to be dispersed in a water-insoluble form, usually in the form of fine powder or granules, and then applied to the fibers using high temperature and pressure. The dye particles then penetrate the surface of the fiber and are locked in place when the fiber cools and solidifies.

Disperse dyes are typically used for dyeing synthetic fibers in textile and fabric applications such as sportswear, swimwear, and outdoor clothing. They are also used in the production of automotive and industrial textiles, as well as in the manufacture of plastic products.

One of the key advantages of disperse dyes is their ability to produce vibrant and long-lasting colors that are resistant to fading, even when exposed to sunlight or other environmental factors. They are also relatively easy to apply and do not require the use of harsh chemicals or heavy metals, making them a safer and more sustainable alternative to other types of synthetic dyes.

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