Abstract
Some of the gas fading inhibitors of N, N′-diaryl-ethyenediamine, -piperadine and -alkylamidine type were synthesized from aniline, toluidine, chloraniline and nitroaniline. They were applied during the dyeing operation in the form of aqueous dispersion. In the presence of inhibitors. cellulose acetate fabrics were dyed with l-mehtylamion-4-hydroxyethylaminoanthraquinone and were compared with each other in their colour fastness to light and burnt gas fumes.
The inhibitors derived from aniline were arranged in the order of inhibiting effect as following: N, N′-diphenylethylenediamine>N, N′-diphenylacetamidine>N, N′-diphenylformamidine>N, N′-diphenylpiperadine.
The oredr of inhibiting ability of N. N′-diarylethylenediamines was qualitatively parallel to the rader of basicity of used anilines, i.e. p-toluidine>aniline>o-toluidine>p-chloraniline>o-chloraniline.
N, N′-diarylethyenediamines are the most effective in the tested compounds as inhibitor but they reduced the light fastness. In this respect, N, N′-diarylacetamidines give more satisfactory results.
