Disperse Dyes

Disperse dyes are a class of water-insoluble dyes that penetrate synthetic fibers and are held in place by physical forces without forming chemical bonds, and they can be applied as organic colorants with no ionizing groups, low water solubility, and suitability for dyeing hydrophobic fibers. Their molecular size is the smallest of all dyes.

Dispersible dyes are usually sold in powder form. They are prepared by milling the press cake with an equal weight of a suitable auxiliary product and a little water, drying it, and then mixing it with a diluent to obtain a product containing 15-40% dye. The very fine particle size provides a large surface area that aids in dissolution and allows for fiber uptake. Disperse dyes are also used for sublimation printing on synthetic fibers and are used as colorants in the manufacture of "iron-on" transfer crayons and inks.

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

• High Fastness Disperse Dyes
• High Wet Fastness Disperse Dyes
• Super High Wet Fastness Disperse Dyes
• Trichromatic Disperse Dyes
• Fluorescent Disperse Dyes
• Alkali Resistant Disperse Dyes
• Environment-friendly Disperse Dyes
• High Wash Fastness Disperse Dyes
• General Disperse Dyes
• Other Disperse Dyes

Features of Disperse Dyes

Disperse Dyeing Process

Disperse dyes are mainly used for the coloration of polyester fibers. Disperse dyeing mainly takes place in five stages, namely (i) dispersion of the dyes in the bath, (ii) dissolution of individual dye molecules in water, (iii) deposition of the dye on the surface of the fibers, (iv) absorption of the dye on the surface of the fibers, and (v) diffusion of the dye within the fibers.

Specifically, disperse dyes are virtually insoluble, but must be slightly soluble. When put into a dye bath, they must be dispersed with the help of a surfactant. A small portion of the dye enters the solution. Moreover, the general structure of disperse dyes is small, planar and non-ionic, with attached polar functional groups like hydroxyalkyl, –NO2 and –CN. The shape makes it easier for the dye to slide between the tightly packed polymer chains, and the polar groups improve water solubility and dipolar bonding between dye and polymer. Therefore, disperse dyes prefer to enter the fibers. The equilibrium is re-established by more dye entering the solution and again entering the fibers. In this way, the depth of dyeing is usually obtained by pressurizing the dye at temperatures above 100°C.

Fig. 1 Dyeing process diagram ^[1]

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 high fastness disperse dyes.

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