Mordant Dyes

Mordant dyes are acid dyes with chelating sites that form stable coordination complexes with metal ions in metal salts (mordants). As the name implies, these dyes require a mordant. Mordants have an affinity for both fibers and dyes, which combine with the colorant, and are used in production to fix the colorant. Mordants improve the fastness of dyes to fibers, such as water, light and perspiration fastness. The choice of mordant is very important because different mordants can significantly change the final color.

Mordant dyes can form chelates with different mordants to develop various colors with superior washing fastness. Generally, the reaction or chelation of dye mordants requires the presence of salt-forming groups, such as hydroxyl or nitroso groups, and oxygen- or nitrogen-containing groups, such as carbonyls, carboxyls, azoles, etc. Mordant dyes are mostly applied on natural protein fibers, nylon and acrylic fibers.

As a professional supplier of high-efficiency dyes, Alfa Chemistry has the ability to provide customers with a comprehensive range of mordant dyes.

Mordant Dyes-Lists

Features of Mordant Dyes

Methods of Using Mordant Dyes

The general use methods of mordant dyes are as follows:

• Chrome mordant process

This is a two-bath process. In this process, the material is first impregnated with insoluble chromium hydrate and then dyed in a separate bath.

• After-chrome mordant process

This procedure also requires two baths. The material is first dyed with acid dyes and then mordanted with chromium in a separate bath. Mordanting also can be done in the same bath after exhaustion of the dye has been completed.

• Meta-chrome process

In opposition to the two-step processes mentioned above, the meta-chrome process simply entails one step, namely, dyeing and mordanting are carried out simultaneously in the same bath. The advantage of this method is that it is easy to color and requires less time than the after-chrome process. It leaves a high residual chromium content in the wastewater.

Alfa Chemistry is committed to becoming a first-class, low-carbon, environmentally friendly dye supplier. Our mission is to provide customers with full specifications of high-quality dyes. We are also constantly expanding our product database to meet the wide range of customer needs. You are welcomed to contact us for more mordant dyes.

It is important to note that our products are for research use only and are not for clinical use.