The use of Yuanming powder and table salt in printing and dyeing

1. Dye promoter:

Both Yuanming powder and table salt can be used as dye accelerators for dyeing cellulose fibers with dyes such as direct dyes, sulfur dyes, vat dyes, reactive dyes, and soluble vat dyes. When there are many residual dyes in the dyeing solution, Yuanming powder or table salt is added as an electrolyte, which can reduce the solubility and ionization concentration of the dye in water, promote the combination of the dye and the fiber, and thus achieve the role of promoting dyeing.

When dyeing dark colors, the dosage of Yuanming powder or table salt should also be selected according to different types of dyes, to avoid excessive or too fast addition to cause the dye to coagulate and precipitate to form color stains.

2. Retarder:

Yuanming powder and table salt can also be used as a retarder for acid dyes and cationic dyes. By reducing the speed of fiber absorption of dyes, it can meet the requirements of level dyeing.

The principle is that the sulfate ions and chloride ions in Yuanming powder and table salt can first form an ionic bond with the amino group on the fiber during the low-temperature dyeing cook stage, and then gradually replace the sulfate or chloride ions with the dye molecules as the temperature increases. Fiber bonding.