Under normal circumstances, a reasonable dyeing process can be formulated. Common dyeing methods include constant temperature rapid dyeing method, saturated dyeing method and ordinary dyeing method.
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 to 90 minutes. After most of the dye is absorbed, the temperature is raised to the boiling point to fix, and the fixation time is shorter. , And 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 has been 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°C below the set temperature, add all the additives (except the chemical additives), run for 10-15 min., then add the fully dissolved dye solution, and run it to the set temperature properly. Keep warm.
Saturation dyeing method refers to a dyeing method in which the sum of the amount of dye and retarder in the dyeing formula and the product of their respective f-values 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 impact on the shade of the color and the shade of the hue.
The ordinary dyeing method is a dyeing method that combines the advantages of the dyeing method that does not add the retarder to control the temperature and the dyeing method that controls the temperature rise at the same time with the retarder, and uses the characteristics of the third-generation retarder, a dyeing method with a wider range of adaptability. 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 cleaning. 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%.
In addition, with the development of dyes suitable for acrylic fibers, in recent years, migration-type cationic dye dyeing methods and disperse-type cationic dye dyeing methods have also been developed.