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 (75-85 ° C) of the dyeing temperature reaches the fiber, 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 ℃. After 85-90 ° C for a period of time, the temperature and dyeing can continue to rise to boil.
2. Dyed 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 the pH value on the upper dye rate is more significant with acrylics containing carboxylic acid -containing albumin, and the upper dye rate of acrylics containing sulfonine -based 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 dyeing 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 scope of the required range.
Add electrolytes to the dye bath, such as Yuanming powder, salt, etc., which can reduce the upper dye rate of cationic dyes and has a slowdown effect. The electrolyte has no obvious mild dyeing effect on the K value of 1 ~ 1.5, and has a mild dyeing effect on the d dyes with a K value of 3 ~ 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 dyeing.
4. Leveling agent
The eveling agent is often added to the dye dye to reduce the upper dye rate and obtains a uniform dyeing effect. The sustained dyes of cationic dyes include cationic slowduts and anteropathic slow -in -dyes.