What is a fixing agent

Fixing agent refers to a class of compounds that can fix the dyes and fibers more effectively. It can improve and improve the soaping and washing fastness of dyed fabrics, so that the color of fabrics is not easy to fade and stain after dyeing and washing. And it is required to use formaldehyde-free color fixing agent to ensure the environmental protection of the fabric.

The performance of the fixing agent:

1. It has strong color fixing ability, which can significantly improve the relevant color fastness of the fabric;

2. The dye has a wide adaptability and has little effect on the fixing effect;

3. Strong affinity with fiber, high depletion rate in color-fixing bath;

4. After the fabric is treated with a color-fixing agent, it will not cause changes in color and light;

5. While improving the relevant color fastness (such as color fastness to washing), other color fastness (such as light fastness) should not be reduced;

6. Does not affect the feel of the fabric, and does not cause the strength of the fabric to decrease.

The role of the fixing agent:

1. Insoluble lakes are formed on the fabrics, and the soluble groups are blocked, so that the dyes on the fabrics are not easy to dissolve and fall off when exposed to water, so as to achieve the purpose of improving the fastness to wet treatment. However, after the color fixing agent is fixed, it is easy to change the color of the dyed object or cause the sun fastness to decrease. 

2. Generate a mesh film on the fabric to prevent the dye from falling off.

3. Using the reactive groups in the fixing agent molecules to cross-link with the reactive groups on the dye molecules and the hydroxyl groups on the cellulose molecules to improve the fixing effect of the dyes on the fibers. 

4. Use the molecular attraction between the fixing agent and the fiber to increase the fixing strength of the fixing agent, thereby improving the dyeing fastness.