Aftertreatment of direct dyes on wool and nylon 6 with syntans and a syntan/cationic system

摘要

Three different syntans were synthesized by condensation of (1) p-cresol,formaldehyde and 4-hydroxy benzene sulfonic acid,(2) p-cresol,formaldehyde and 6-hydroxy-2-naphthalene sulfonic acid,(3) p-cresol,formaldehyde and phenol,followed by sulfonation;the structures of these syntans were characterized using 1H NMR and FTIR.The effect of aftertreatment with the synthesized syntans,a commercial syntan and a syntan/cation system on the wash fastness of dyed nylon 6 and wool fabrics was determined.Aftertreatment of the dyeings using above syntans improved the wash fastness;further improvement was achieved by the sequential application of a cationic compound to the fabrics.