- Yellow colour: Acetoacetic acid anilide pigments
- Red: Azoic pigments
- Blue or green: Phthalocyanine pigments
Dyeing Process basically discusses what you do with the dyes. There are today available latest and state-of-the-art dyeing methods that effectively colour the various substrates. This is a very critical operation carried out in the Dye houses in a series of steps. The pages here gives precious information regarding the various dyeing processes in different industries.
Dyeing Process » Pigment Dyeing
Pigment dyeing is a comparatively recent addition. In the process of pigment dyeing no actual chemical reaction takes place between the dye and the fabric. Instead, what happens is that the pigments gets seated on the fabric with the help of binders. There is a challenge in pigment dyeing. Pigments are not soluble in water and shows no affinity for fiber. So, conventional dyestuff-based dyeing conditions are not feasible for pigment dyeing. To come to terms with such limitations, a new kind of pigments have been formulated for use in fibers. These are maintained in a stable dispersion in the medium of water by anionic surfactants. This type of pigment is known as pigment resin color (PRC), primarily used in printing. Some of the popular pigments used in fabrics are given here.
A good pigment dyeing system should ideally come with the follow innovative features.
A typical process of pigment dyeing for cellulosic textile materials consists of padding the textile materials with a Dye bath. The dye bath contains anionic or neutral colour dispersions of pigments. Along with the pigments it also contains anionic binders, acid-liberating catalyst, anti-migrating agents, and other types of additives. Then the textile materials are dried at high tempratures, this cures the film-forming binders and pigment colours firmly on the textiles.