1. Constant temperature rapid dyeing method refers to dyeing at a temperature above the glass transition temperature and below the boiling point, and holding it for 45-90 minutes. After most of the dye is absorbed, the temperature is raised to the boiling point to fix, and the fixation time Shorter, then slowly lower the temperature to 50 ℃, the method of washing out the car. The key to this method is to choose a constant temperature for dyeing. Due to the emergence of the third-generation retarder, the insurance coefficient of this method is greatly improved. In addition, the dyeing formula of this method is relatively simple. The general composition is a buffer solution composed of acetic acid and sodium acetate, a retarder A of 0.2% or less, and a leveling agent 1227 of 0.3% to 0.5%. When the amount of dye is large, 2.0 to 3.0% of urea is added. Install the dyed object in the machine, add water and raise the temperature to 5℃ below the set temperature, add all the additives (except the additives for chemical materials), and run for 10-15 min., then add the fully dissolved dye solution, and run properly to the set temperature. Keep warm.
2. Saturation dyeing method refers to the dyeing method in which the sum of the amount of dye and retarder in the composition of the dyeing formula and the product of the respective f-value is equivalent to the dyeing saturation value of acrylic fiber.
The key to the saturation dyeing method is the mastery of the amount of the second-generation retarder, which has a direct effect on the shade of the color and the shade of the hue.
3. The general dyeing method combines the advantages of the dyeing method without adding retarder to control the temperature and the dyeing method with retardant at the same time to control the temperature rise, and uses the characteristics of the third-generation retarder, a dyeing with a wider range of adaptability law. The leveling agent 1227 and the retarding agent A in the dyeing formula have a synergistic effect. Leveling agent 1227 plays more role in diffusion, penetration and washing. The dosage of the retarding agent in the formula is 0.02% to 0.4%, and the dosage of the leveling agent 1227 is 0.2% to 0.5%.