Acrylic fiber (polyacrylonitrile fiber) has its saturation value (SF). Generally, the saturation constant of domestic acrylic fiber is 2.1-2.3. Therefore, the sum of cationic dyes and retardants (positively charged properties) used in dyeing should be controlled at Around 2.5% (o.w.f). It must be noted here that if the retarder used is surfactant 1227, then the color blooming phenomenon is indeed difficult to control. Practice has proved that this kind of retarder has strong positive charge, and the competitive dyeing power is high in the initial dyeing stage, and the dye cannot go up. When it reaches about 95℃, there is almost a warm room replacement, that is, the retarder originally dyed on the “seat” The dye was suddenly replaced by the dye that had been waiting outside the door, causing color bloom, so the retarder is rarely used now. To overcome dyeing stains, a more effective method is:
First of all, the retarder for acrylic fiber can be MOB or MOC produced by Shanghai Auxiliary Factory. It has almost no “instant replacement” function, and the leveling effect is poor. good. At the same time, in order to ensure dyeing, there is no need to add two surfactants as retarder or leveling agent in the same bath. Strictly speaking, use one surfactant and then use an inorganic salt Na2SO4. , the leveling effect is much better. The dosage of the former is 0.5-1% (o.w.f); the dosage of the latter is 5-10g/L.
Secondly, it is not advisable to use segmented heating and temperature-maintaining dyeing methods. Generally, it is advisable to add materials at room temperature. After the initial dyeing, the temperature is raised to 100℃ at a speed of 1.5℃/min, and the heat preservation dyeing method is 40-60min (from light to dark color). During this stage, the temperature should be relatively stable and avoid sudden highs and lows to avoid ring dyeing and making it difficult to absorb the cationic dyes in the dye bath.
After the dyeing is completed, the temperature should be cooled to 65-70°C at a rate of 1°C/min, and then the dye solution should be drained while injecting cold water until it cools down. Completely remove the residual liquid in the tank and replace it with fresh water for washing. Clean surface floating color and additive residue. This will not cause the fiber or yarn to deform, and it will feel soft and fluffy.
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