Latest News and Updates on Textile Auxiliaries and Dyes

Sulfur dyes are dyes that must be dissolved in alkali sulfide. They are mainly used for dyeing cotton fibers, but also for cotton/dimensional blended fabrics. The cost is low, and the dyed products are generally washable and light-resistant, but the color is not bright enough. Commonly used varietie Read More

Acid dye refers to the acid group contained in the dye molecule, also known as anionic dye, which can combine with the amino group in the protein fiber molecule by ionic bond, and is applicable under acidic, weak acid or neutral conditions. Mainly are azo and anthraquinone structures, and a few are Read More

The structure of reactive dye molecules can affect wet rubbing fastnessl. Water solubility of dyes The more water-soluble groups contained on the reactive dye molecule, the more favorable it is for the dissolution and uptake of the dye during the dyeing process, and of course the washing of floatin Read More

1. Various synthetic fibers have different physical and chemical properties, so the requirements for dyes are also different. Generally speaking, the polarity of the dye, the size and shape of the molecular structure must be compatible with the polarity and physical structure of the fiber. The basic Read More

What are the characteristics of reactive dyes?What we often call reactive dyes is also called reactive dyes. It is a type of dyes that react with fibers during dyeing. Reactive dyes are a new type of dyes, including two main components: the parent dye and the reactive group. , The group that can rea Read More

1. BubbleFoam is the most common problem of high temperature and high pressure jet overflow dyeing. In the high-temperature and high-pressure jet overflow dyeing machine, the occurrence of foam is the result of high-energy turbulence caused by high-speed operation of the fabric and liquid circulatio Read More

1) Such as wax spots, pulp spots, etc., water droplets, hard water and sand texture defects;2) The blank is not fully saturated before dyeing, causing white spots and florets after dyeing;3) There are calcium spots and alkali spots on the cotton fabric;4) Calcium hypochlorite is used in the bleachin Read More

Level dyeing problem of reactive dyesWhen reactive dyes are dyed, special bath softeners have been used to prevent rope creases or to promote dye penetration.Since reactive dyes are water-soluble, anionic levelling agents are generally not used. However, some reactive dyes have low solubility in alk Read More

The poor water solubility of disperse dyes is almost entirely dependent on the dispersant that coats them to form hydrophilic dye colloidal particles before dispersing the dispersant in water. However, during the dyeing process, due to the shear force of the dyeing solution and the high temperature Read More

Sublimation fastness: refers to the migration and vaporization of dye molecules inside the fabric when heated during high-temperature processing or storage of colored fabrics. Dye molecules will migrate from the fabric to the surface of the fabric when heated, which will reduce the color fastness of Read More

The solution degree of reactive dyes is related to alkaline agentsWhen the alkali agent is added, the β-ethylsulfone sulfate of the reactive dye will undergo an elimination reaction to form its real vinyl sulfone, which is very soluble in genes. Since the elimination reaction requires very few alkal Read More

For reactive dyeing, when the pH value is 7-9, the color difference of the product is normal, indicating that the pH range has little effect on the color difference of the product, and the presence of a small amount of alkali will not change or destroy the chromogenic group of the reactive dye molec Read More