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Cationic dyes - Classification

The positively charged group in the cationic dye molecule is connected with the conjugate system in a certain way, and then becomes salt with the anion group. According to the position of groups with positive charge in conjugate system, cationic dyes can be divided into isolation type and conjugate type.

1. Isolated cationic dyes

The isolated cationic dye parent and the group with positive charge are connected by the isolation group. The positive charge is localized, and quaternary ammonium group is introduced into the molecular ends similar to disperse dyes.

Due to the concentration of positive charge, it is easy to bond with fibers, and the dyeing percentage and rate are relatively high, but the levelness is not good. Generally dark color, low molar absorbance, color light is not strong enough, but heat and light resistance, high fastness, often used for dyeing medium and light.


2. Conjugate cationic dyes

The positive charge groups of conjugate cationic dyes are directly connected to the conjugate system of dyes, and the positive charge is delocalized. The color of this kind of dyes is very bright, high molar absorbance, but some varieties of poor light resistance, heat resistance. In use kind, the conjugate type accounts for more than 90%. There are many kinds of conjugate cationic dyes, such as triarylmethane, oxazine and polymethyl chloride.

Hangzhou Chungyo Chem Co., Ltd.

chungyo@cycolorant.com

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