The function of printing and dyeing auxiliaries Although the amount of textile dyeing and finishing auxiliaries is very small, they play an important role in textile processing, sometimes even indispensable. In the final analysis, the use of textile dyeing and finishing auxiliaries can play the following roles in textile processing:

1. shorten the processing cycle or reduce the processing procedures to save time and improve efficiency.

2. Reduce energy consumption, save energy and reduce costs.

3. Reduce the pollution of three wastes and improve the environmental quality。

4. Improve the printing and dyeing effect and the appearance and internal quality of fabrics.

5. Give textiles some special functions or styles to improve the performance of products and increase their value;

Classification of printing and dyeing auxiliaries Printing and dyeing processes are classified according to the functions and functions of auxiliaries. The classification of dyeing and finishing auxiliaries in the printing and dyeing process is usually based on the role of auxiliaries in the printing and dyeing process, that is, according to the processing procedures of textiles and the use of auxiliaries. According to the function of textile dyeing and finishing auxiliaries, textile dyeing and finishing auxiliaries can be divided into the following categories:

Textile dyeing auxiliaries for textile finishing synthetic fibers: smoothing agents, emulsifiers, wetting agents, antistatic agents, softeners, antioxidants, mildew inhibitors, etc. (Natural fiber: wool spinning oil, spinning oil, weaving oil and sizing oil. Textile auxiliaries of wool and hemp: scouring auxiliaries, crude oil and degumming agents, etc.

Pretreatment assistants: desizing assistant, scouring assistant, bleaching stabilizer and mercerizing assistant.

Dyeing agents: levelling agents, dispersants, detergents, reducing agents, anti-precipitants, anti-migration agents, etc.

Additives: printing paste, pigment printing additives, adhesives, thickeners, wetting agents, etc.

Finishing agent: resin finishing agent, softening agent, curing agent, waterproof agent, flame retardant, antistatic agent, mothproof agent, coating finishing agent, oil-proof finishing agent, easy stain agent, etc.

Other auxiliary materials: sanitary finishing agent, anti-mosquito finishing agent, anti-schistosomiasis finishing agent, regressive reflection finishing agent, etc.

Classify raw materials in proportion. According to the composition of raw materials, textile auxiliaries can be divided into surfactant auxiliaries and non-surfactant auxiliaries, each of which can be divided into several subclasses, such as anionic surfactant auxiliaries, cationic surfactants, zwitterionic surfactants and nonionic surfactants.

Additives containing surfactants mainly include detergents, penetrants, scouring agents, dispersants, emulsifiers, leveling agent, softeners, antistatic agents, etc. The proportion of this auxiliary agent accounts for about 10% of the whole printing and dyeing auxiliary agent! Some of these surfactants are pure, and most of them contain surfactants and their complexes, such as emulsifiers, wetting agents, detergents and so on.

Additives without surfactants mainly include oxidants, solvents, inorganic salts, fixing agents, anti-wrinkle finishing agents, flame retardant finishing agents, thickeners, adhesives, etc.