Latest News and Updates on Textile Auxiliaries and Dyes

Intermediate temperature reactive dyes have the problem of "unevenness", which is prone to dyeing defects such as color spots, chromatic aberrations, and stains. This is because there are two major defects in the dyeing performance of moderate temperature reactive dyes:①The stability of salt and alk Read More

Reactive dyes are used for cellulose fiber dyes, generally through three stages of adsorption, diffusion and fixation:There is no covalent bond reaction between the dye and the fiber during the adsorption and diffusion process. When the alkali agent is added to make the pH of the dye bath alkaline, Read More

For the dyeing of cellulose fibers, the proportion of reactive dyes is currently the largest. Reactive dyes are water-soluble dyes containing reactive groups that can chemically combine with macromolecules such as cotton, wool and silk, so the soaping and rubbing of dyed fabrics The fastness is very Read More

The active groups are monochloro-s-triazine and vinyl sulfone heterobi-reactive dyes. The commodity categories are named differently, mainly including M type, B type, RR type, BF type, BH type (partial), etc. The recommended dyeing temperature is 60～80℃. Due to the synergistic effect of two differen Read More

KN type mostly refers to the middle-temperature reactive dyes whose reactive groups are vinyl sulfones. The recommended dyeing temperature is 45～60℃, with moderate reactivity. This type of dye is basically dyed in the form of ß-hydroxyethyl sulfone sulfate. Because of its low directness to the fiber Read More

Reactive dyes generally have poor chlorine fastness, which mainly depends on the molecular structure of the color body. There are sulfonic or carboxylic acid groups at the ortho position of the diazo group of the dye, or there are sulfonates at the ortho or para position of the hydroxyl group of the Read More

In the current printing and dyeing process, reactive dyes are one of the most widely used dyes. This is because reactive dyes are reactive dyes. The macromolecules of the dye contain reactive groups, which can react with the hydroxyl (-OH) or amino (-NH2) of the fiber during the dyeing process to fo Read More

Why is the wet fastness and rubbing fastness poor when the reactive dyes dye the dark color of cotton? How to deal with it?(1) Reasons for poor fastness. Unlike direct dyes dyeing cotton, neutral (or acid) dyes dyeing nylon, disperse dyes dyeing polyester, reactive dyes dyeing cotton are not combine Read More

For dyeing with reactive dyes, the choice of the three primary colors of dyes must be paid attention to by dyeing workers. Among them, the ratio shift value (Rf) of the dye is a very important parameter. The Rf value represents the affinity of the dye. During dyeing, it determines the instantaneous Read More

What should I do if color spots and stains appear in reactive dyeing?Reactive dyes have a very good solubility in water. Reactive dyes mainly rely on the sulfonic acid groups on the dye molecules to dissolve in water. For meso-temperature reactive dyes containing vinylsulfone groups, in addition to Read More

Dye characteristics: The reactivity of vinylsulfone-based reactive dyes is between dichloro-s-triazine and monochloro-s-triazine, and it is a medium-temperature reactive dye. It is characterized by acid and alkali resistance, so pre-alkali can be used during dyeing. Vinylsulfone-based dyes are brigh Read More

Cationic dyes are a kind of textile dyes, also known as basic dyes and basic dyes. Dissolved in water, it is in cationic state. Cationic dyes are soluble in water and ionize in aqueous solution to generate dyes with positively charged colored ions. The cation of the dye can combine with the acidic g Read More