Dyeing of polyamide granulate with preliminary treatment with acetic acid solution

It was found that preliminary treatment of PCA granulate with a dilute solution of CH₃COOH sharply increases the rate and degree of sorption of acid dyes by PCA granulate. A technological regime for dyeing PCA granulate with acid dyes was proposed and approved in industrial conditions; it allows increasing the intensity of the color by several times with almost total extraction of the dye from the bath.Ivanovo State Academy of Chemical Engineering. Translated from Khimicheskie Volokna, No. 4, pp. 35–37, July–August, 1996.