Views: 3 Author: Site Editor Publish Time: 2023-03-31 Origin: Site
The cationic dye has a large affinity for acrylic. When dyeing, it spreads slowly due to fast adsorption, which is prone to dyeing uneven phenomenon. Once the dyeing is incomplete, it is difficult to correct it by extending the dyeing time. When dyeing the cation dye, in order to obtain a uniform dyeing result, the upper dye rate should be appropriately reduced. In addition to the type of dyeing rate of yang ion dyes, in addition to the types of acrylic, there are also the following aspects:
Temperature is an important factor in controlling uniform dye. When acrylic dyeing with cationic dyes, there is very little dye below 75 ° C. When the vitrification temperature of the dyeing temperature reaches the fiber (75-85 ° C), the upper dye rate of the dye increases rapidly. Therefore, when the vitrification temperature of the dyeing temperature reaches the fiber, the temperature should be slowly heated, generally the temperature of the temperature every 2 to 4 min L ℃. It can also be kept up to boiling after 85-90 ° C for a period of time.
2. Dye bath pH value
Adding acid in the dye bath can inhibit the dissolution of acid groups in acrylic, reduce the number of anion groups on the fiber, reduce the gravitational gravity between dyes and fibers, and reduce the dyeing rate. The impact of pH value on the upper dye rate is more significant with acrylics containing carboxylic acid -containing bases. The upper dye rate of acrylics containing sulfonic acid -containing alcohol is less affected by the pH value of the dye bath. When dyeing, the pH value of the dye bath should be reasonably controlled. Cattea dye is generally not resistant to alkali. The best pH value of dyeing is generally 4-4.5. The pH value of the dyeing bath when dyeing is higher. When dyeing is light, it should be performed at a lower pH value. The pH value of the dye bath is generally adjusted with acetic acid. The acetic acid can not only reduce the pH value of the dye bath, but also improve the solubility of the dye. Add sodium acetate at the same time in the dyeing bath, which can stabilize the pH value of the dye bath within the required range.
Add electrolytes to the dye bath, such as Yuanming powder, salt, etc., which can reduce the upper dyeing rate of cationic dyes and has a slow -dyeing effect. The electrolyte has no obvious sustained dye with the dye of 1 ~ 1.5, and has a mild dyeing effect on the dnance of 3 to 5. The mild dyeing effect of electrolyte decreases with the impact of the dyeing temperature. When dyeing is light, the amount of electrolyte can be higher, about 5%to 10%(O.W.F.), And it can not be added when the dye is dyed.