Printing and dyeing auxiliaries description

Printing and dyeing auxiliaries are auxiliaries used in the process of fabric printing and dyeing, which can improve the effect of printing and dyeing. They include printing auxiliaries and dyeing auxiliaries. Printing auxiliaries include thickeners, adhesives, and cross-linking agents. Agents, emulsifiers, dispersants and other printing auxiliaries.

Stain

Dyeing is the main body of the dyeing process. Different fiber fabrics use different varicolored agents, and according to different processes, dye processing auxiliaries include cosolvents, dispersants, color developing agents and phthalocyanine auxiliaries. The dyes used in dyeing are not direct dyes, vat dyes, reactive dyes, phthalocyanine dyes and insoluble azo dyes.

Levelling agent

Leveling agents include natural fiber leveling agents, synthetic fiber leveling agents, and blended fabric leveling agents. The condition for leveling agents is that the dye can be slowly absorbed by the fiber or the dark part of the dye can diffuse to the light part. Does not reduce the color fastness. All auxiliaries with slow dyeing and migration effects are called levelling agents.

Fixative

There are three types of fixing agents, cationic surfactants, non-surface-active quaternary ammonium salts and resin-based fixing agents. The fixing agents can form dyes into water-insoluble dye salts or increase the size of dye molecules. It is soluble in water to improve the firmness of dyeing.

Dispersant

Dispersant is an indispensable auxiliary in dye processing and dye application. It can disperse the dye particles to about 1μm, help to pulverize particles and maintain dye dispersion stability. Dispersants are mostly various types of surfactants, including Anionic, cationic, non-ionic, amphoteric and polymer type, etc.

Fluorescent brightener

Fluorescent whitening agent is abbreviated as FWA. It makes the yellow-brown pigment on the fabric that cannot be removed by chemical bleaching become white with the aid of optical complementary color, and the whiteness is more gorgeous due to the increased brightness.

Softener

Most of them have fragrance. Fragrances and dyes are mostly petroleum derivatives and contain benzene. If the manufacturer uses poorer grade raw materials, it will cause skin irritation. During the washing process of clothes, the fine fibers are often entangled, tangled together, or even broken. After the clothes are washed for many times, the alkaline effect of the detergent affects the inherent smoothness, extensibility and elasticity of the fibers. The thing is that the whole piece of clothing looks old and invisible, and feels harder to the touch. The more the clothes are washed, the more obvious the feeling. The function of the fabric softener is as if a protective film is evenly applied to the surface of the fabric fiber. Due to the absorption of the softener on the fiber surface, the friction coefficient between the fibers is reduced.