DYEING OF CUPRAMMONIUM FIBER GRAFTPOLYMERIZED WITH GIYCIDYL METHACRYLATE

Abstract

Dyeing properties of cuprammonium fiber (BF) graftpolymerized with glycidyl methacrylate (GMA) are studied, especially for substantive dye Congo Red and basic dye Magenta. These two dyes contain amino groups in their molecules, which can react with epoxide of GMA. Magenta stains so fast BF-GMA as reactive dyeing, but Congo Red stains the fiber not so fast as reactive dyeing without pyridine catalyst in the dye bath. The adsorbed Magenta on BF-GMA can not be extracted by normal organic solvents (o-chlorophenol, dimethylformamide etc.), while the adsorbed Congo Red on BF-GMA is extracted easily by these solvents.
The dyeing properties of BF-GMA for Congo Red in absence of catalyst are similar to that of normal substantive dyes; the higher the dyeing temperature the higher becomes the dyeing velocity and the lower maximum txhausion of dye. By addition of pyridine as catalyst in the dye bath, dyeing temperature affects only the dyeing velocity, and the maximum exhaution of dye showes the same value at each temperature in equilibrium. By adding the catalyst The velocity of exhation of dye Congo Red by BF-GMA apparently takes the second order reaction between dye molecules and epoxides on the fiber. The activation energy of the reaction is large enough (ca. 20 kcal.), to be concidered as a chemical reaction. What is interesting is, that Magenta adsorbed on BF-GMA shows quite different hue from that on wool, acrylic fiber or cuprammonium fiber graftpolymerized with acrylonitrile (BF-AN), all dyed under the same condition. Dye of this hue (just like that of Crystal Violet) is synthetized by reaction of Magenta and by reaction of Magenta and GMA in ethyl alcohol at boiling point adding hydroquinone as a inhibitor for polymerization reaction. We have named this new dye “Nobeoka Violet”, which have the maximum absorbtion at 610mμ in aqeous solution.
The dyed pieces of BF-GMA with Magenta and BF-AN with Nobeoka Violet are scarcely distin-guishabe from each other by the hue. It is assumed, that Nobeoka Violet is synthetized on fiber in dyeing of BF-GMA by Magenta.