Types of fixing agents

1. Non-reactive color-fixing agent: The color-fixing mechanism of non-reactive color-fixing agents is generally two types of blocking water-soluble groups and film formation on the surface of fibers, which can be divided into cationic color-fixing agents and resin-based color-fixing agents.

The cationic fixing agent mainly forms ionic bond with the anionic group in the cation and the dye molecule, thereby blocking the water-soluble group and achieving the purpose of improving the fastness to wet treatment.

Resin type fixing agents are divided into two categories, polyamine polycondensates and quaternary ammonium salt polymers;

Polyamine polycondensate is a high polymer made of polyamine compounds such as ethylene polyamine and dicyandiamide or polycondensation with other compounds. It is cationic, has a network structure, and can be used with anionic dyes to produce macromolecular compounds. , which can improve the wet fastness of dyed fabrics and the wet ironing fastness of reactive dyes.

The quaternary ammonium salt polymer is a high polymer, a homopolymer, or a copolymer formed by copolymerizing an olefin with a quaternary ammonium group, or a copolymer formed by copolymerizing with other monomers. This type of fixing agent is water-soluble, especially suitable for reactive dyes. The treated fabrics have bright colors, good chlorine fastness, good light fastness and perspiration fastness, and can protect reactive dyes from the influence of acidic atmosphere. But higher temperature washing fastness is poor.

2. Reactive color-fixing agent: Reactive color-fixing agent usually introduces a reactive group into the molecule of the color-fixing agent. The most commonly used reactive gene group is epoxy group, and epichlorohydrin is usually introduced. In addition to having reactive groups that can cross-link with fibers, this type of color-fixing agent is often achieved by blocking water-soluble anionic groups with cationic groups and forming resin films.

3. Special performance color-fixing agent: This type of color-fixing agent can be divided into: nylon color-fixing agent, wet rubbing fastness improving agent, special color-fixing agent for turquoise blue, hydrophilic color-fixing agent, Red light fixative.