The possibility of unconventional dyeing of polyamide fabric with direct dye was
investigated in this paper. Dyeing of polyamide fabric with direct dye was realized
in the laboratory with the tendency to apply it in industrial conditions. 100% raw
polyamide 6.6 fabric was used. Polyamide belongs to the group of synthetic fibers.
The fabric was dyed with a direct dye of a specific structure that has a
predisposition to binding to the fiber. Direct dyes are sulfonated azo compounds
derived from benzidine and its derivatives or amines of the diaminostilbene type,
etc. and are commonly used to dye of cotton. The samples were dyed at a
temperature of 95 °C. The dye used is C.I. Direct Green (Huntsman, USA).
Samples of polyamide 6.6 fabric were dyed in a time period of 5, 10, 20, 30, 40, 50
and 60 minutes. The solution contained dye concentrations of 5, 10, 15, 20, 25 and
30 mg/dm3
. Adsorption isotherms are of great importance for the investigation of
the dyeing process, so several of them, Halsey, Jovanovic and Temkin, were used in
this research. The Halsey model proved to be the most suitable for explaining
polyamide dyeing with direct dye. The successful process of dyeing polyamide
with direct dye has expanded the range of dyes that can be used for polyamide.
