Compatibility For Disperse Dyes

Date:Jul 03, 2020

1. Definition of compatibility:

In large-scale dyeing production, in order to obtain good reproducibility, it is usually required that the dyeing performance of the trichromatic dyes used is similar to ensure the consistency of the color before and after the batch. How to control the color difference between the batches of dyed finished products within the allowable range of quality, this is the same problem involving the compatibility of dyeing prescriptions, which is called the compatibility of dyes (also known as dye compatibility). The compatibility of disperse dyes also has a certain relationship with the depth of dyeing.

Disperse dyes used for acetate dyeing usually require coloring at approximately 80°C. The dyeing temperature is too high or too low, which is not conducive to color matching.

2. Compatibility test:

When polyester is dyed at high temperature and pressure, the dyeing characteristics of the disperse dye often change due to the incorporation of another dye. The general principle is to choose dyes with similar critical dyeing temperatures for color matching. In order to investigate the compatibility of dyes, a series of small sample dyeing tests can be done under similar conditions to the dyeing production equipment, and the main process parameters such as the prescription concentration, dye temperature and dyeing time can be changed to compare the color consistency of the dyed fabric sample. , Combine dyes with better dye compatibility.

3. How to choose the dye compatibility reasonably?

When the polyester-cotton blended fabric is hot-melt dyed, the colorblock dye must also have the same properties as the monochromatic dye. The hot melt temperature and time should be adapted to the fixing characteristics of the dye to ensure the highest color yield. Each single-color dye has a specific hot-melt fixation curve, which can be used as the basis for the initial selection of color-matching dyes. High-temperature type disperse dyes usually cannot match colors with low-temperature type, the hot melt temperature required by the two is different. Medium temperature dyes can not only match colors with high temperature dyes, but also have compatibility with low temperature dyes. For reasonable color matching, the consistency between the performance of the dyes and the fastness of the dyeing must be considered. The result of any color matching is unstable color, and the color reproducibility of the product is not good.

It is generally believed that when the shape of the hot-melt fixation curve of the dye is the same or similar, and the number of monochromatic diffusion layers on the polyester film is also the same, when the two dyes are dyed together, the color light in each diffusion layer does not change, which means that the two The dyes have good compatibility with each other; on the contrary, the shape of the hot-melt fixation curves of the dyes is different (for example, one curve rises with increasing temperature, the other curve decreases with increasing temperature), and the monochromatic diffusion layer on the polyester film When two dyes with different numbers are put together, the colors in the diffusion layer are different, so it is not suitable to fight each other, but the same hue can not be limited by this. Let's take a chestnut: the shape of the hot-melt fixation curve of the dispersed dark blue HGL and the dispersed red 3B or the dispersed yellow RGFL is completely different, and the number of diffusion layers on the polyester film is also different. Disperse Red M-BL and Disperse Red 3B are similar in color, and although their hot melt properties are inconsistent, they can still be used for color matching.