Fixing agent is one of the important auxiliaries in printing and dyeing industry. Fixing agent can improve the color fastness to wet treatment of dyes on fabrics. Fixing agents can form insoluble colors with dyes on fabrics, which can improve the color fastness to washing and perspiration. Fixing agents can sometimes improve their fastness to sunlight.
In recent years, with the development of science and technology, dyeing and finishing technology has also been significantly improved. With the expansion of international textile trade and the improvement of people's living standards and environmental awareness, textiles are required to be comfortable, clean and safe. Quaternary ammonium salts with cationic properties are combined with sulfonic anions on dyes to form water-insoluble colour deposits, which can attract and combine positive and negative electrostatic forces. The colour fixing agent can improve the colour fastness, especially the washing fastness.
There are three types of fixing agents: cationic surfactants, non-surfactant quaternary ammonium salts and resin-based fixing agents. The fixing agent of printing and dyeing auxiliaries can bind dyes into water-insoluble dye salts or make dye molecules larger and insoluble in water. The fixing agent can be used to improve the dyeing firmness.
Leveling agents include natural fiber leveling agents, synthetic fiber leveling agents and blended fabric leveling agents. As leveling agents, the condition is that the dyes can be slowly absorbed by the fibers or diffused to the light part of the dark part of the dyes without reducing the dyeing firmness. All auxiliaries with retarding and migrating effects are called leveling agents.
Dispersant dispersant is an indispensable assistant in dye processing and dye application. It can disperse dye particles to about 1 micron, which is helpful to grind dye particles and maintain dye dispersion stability. Dispersants are mostly various types of surfactants, including anionic, cationic, non-ionic, amphoteric and macromolecule surfactants.
Fluorescent whitening agent FWA is abbreviated as fluorescent whitening agent. By means of optical complementary effect, it can whiten the yellowish-brown pigments on the fabric which cannot be removed by chemical bleaching. The brightness is more brilliant due to the enhancement of photometry.
Most of the softeners have fragrance. Most of the aromatics and dyes are petroleum derivatives. They contain benzene. If the manufacturer uses the raw materials of poor grade, they will also cause irritation to the skin. In the process of washing clothes, fine fibers are often entangled and even broken. After washing clothes for many times, the alkaline effect of detergent will affect the inherent smoothness, extensibility and elasticity of the fibers. What shows is that the whole clothes look old and shapeless, and feel stiff when touched. The more times the clothes are washed, the more this feeling will become clearer. Obvious. Clothing softener acts as a protective film on the surface of fabric fibers. The friction coefficient between fibers decreases due to the adsorption of softener on the surface of fabric fibers.