Abstract
In the dyeing of the acetate silk by the dispersed acetate dyestuffs, effects of the acids on the dyeing properties, of the dyestuffs were examined.
The change of color and F-value (Kubelka-Munk equation) of the dyeings dyed in the bath acidified with the acetic or sulfuric acid having the concentration from 0.005g/100c.c. to 0.5g/100c.c. was measured by the spectrophotometer and the results are represented by the C. I. E. system.
Nine dyestuffs of azo or anthraquinone series were used and nine experiments containing the neutral dye bath for each dyestuff were tried.
It was found that generally the change of the dominant wavelength was small and the excitation purity increases in the CH3COOH-acidic bath, but decreases in the H2SO4-acidic bath for the most dyestuffs.
The F-value in the Kubelka-Munk equation for all the dyestuffs examined increase in the acidic bath. As to H2SO4-acidic bath the F-value increased in low concentration of H2SO4, while decreases as the concentration of the H2SO4 increased.
