Several dyeing methods of acrylic yarn?

            Generally, a reasonable dyeing process can be formulated for acrylic yarn. The common dyeing methods of acrylic yarn include constant temperature rapid dyeing, saturation dyeing and ordinary dyeing.

           Constant temperature rapid dyeing refers to dyeing at a certain temperature above the glass transition temperature and below the boiling point, and holding for 45 ~ 90min, After most of the dyes are absorbed, the temperature is raised to the boiling point for fixation, and the fixation time is short, and then the temperature is slowly reduced to 50 ℃, and the car is washed out. The key of this method is to choose a constant temperature dyeing temperature. Due to the emergence of the third generation of retarders, the insurance coefficient of this method is greatly improved.

           Saturation dyeing refers to a dyeing method in which the sum of the product of the amount of dyes and retarders in the dyeing formula and their respective F values is equivalent to the dyeing saturation value of acrylic fiber.

           The common dyeing method is a kind of dyeing method that integrates the advantages of the dyeing method of controlling temperature without retarder and the dyeing method of controlling temperature rise at the same time with retarder, and takes advantage of the characteristics of the third generation of retarder, which has a wide range of adaptability. Leveling agent 1227 in the dyeing formula has a synergistic effect with retarding agent a. Leveling agent 1227 plays a more role of diffusion, penetration and cleaning. The dosage of retarding agent in the formula is 0.02% - 0.4%, and the dosage of leveling agent 1227 is 0.2% - 0.5%.