Yuan Ming powder is also known as sodium sulfate, 10 molecules of water can be called miscanthus nitrate, Yuan Ming powder is widely used in the printing and dyeing industry, such as acid dye retardant, dyeing cotton dyeing agent, dye filler, etc., so what are the specific roles of Yuan Ming powder in dyeing?
The role of Yuan Ming powder in dyeing
1. It can be used as a dyeing agent for dyeing cotton fibers with direct dyes, sulfur dyes, vat dyes, reactive dyes and soluble vat dyes, and can adjust the dyeing speed of the dye on the fiber, and can adjust the dyeing rate of the dye on the fiber.
2. It can be used as a retardant for acid dyes and cationic dyes on wool acrylic fiber, so as to reduce the adsorption rate of dyes on fibers and meet the requirements of leveling.
3. The dyeing mechanism of Yuan Ming powder on dyes and fibers is basically the same, due to the low coloring rate of direct dyes, the dyes are not easy to be absorbed by the fibers, and there are more residual dyes in the foot water after dyeing, which can reduce the solubility of the dyes in the water, promote the combination of dyes and fibers, increase the dyeing rate of the dyes, and improve the dyeing speed of the dyes.
4. Yuanming powder can be used as a retardant when dyeing wool to slow down the dye dyeing rate during dyeing. Wool dyeing is generally acid dyes and reactive dyes. Under acidic conditions, the dye anions are close to the cationic amino groups on the wool fibers and adsorb to each other. If the rate of this adsorption is too fast, it will lead to uneven dyeing and dyeing of flowers. The addition of Yuan Ming Powder can use the sulfate anion of Yuan Ming Powder to preempt the dye seat, slow down the rate of dye binding, and be more conducive to the uniformity of dyeing.
In addition, the purity of Yuan Ming powder is high, it can withstand strong heat and finally decompose, and in direct dye dyeing, Yuan Ming powder can get a bright color as a dye promoter. Yuan Ming powder should be fully dissolved with water before use, filtered and added to the dyeing pot, and slowly added while stirring to prevent the undissolved dyeing agent from entering the dyeing pot, causing excessive local contact with the dye, causing the dye to salt out and black defects on the dye.