Five Tanning-dyeing Processes Based on Triphenodioxazine (TPDO)

Abstract

Triphenodioxazine (TPDO) is a high-performance chromophore.
Based on TPDO, five simultaneous or combined tanning-dyeing
processes were undertaken with pickled sheep pelt. Process 1
utilized a simultaneous tanning-dyeing material named
TPDO-GT, a reactive dyestuff with aldehyde reactive groups
which was prepared by grafting TPDO to the backbone of a
glutaraldehyde-like compound (GT). The other four processes
were combinations of TPDO with gallic acid (GA) and Al (III),
Fe (III) salts, through treating the pelt using a different adding
order. The adding order of Process 2 was to treat the pelt with Al
(III) salt first and then the mixture of (TPDO+GA); that of
Process 3 was to add the mixture of (TPDO+GA) first and then
the Al (III) salt; that of Process 4 was to add Fe (III) salt first and
then the mixture of (TPDO+GA); that of Process 5 was to add
the mixture of (TPDO+GA) first and then Fe (III) salt. Tanningdyeing
effects of the five processes were compared, and the
results were as follows: For hydrothermal stability (Td from DSC
analysis), 2 > 3 > 4 > 1 > 5; for colors, 1 was purple-red, 2 was
dark purple, 3 was red brown, 4 was dark green, 5 was brown
back; for washing fastness, 1 > 2 > 3 ? 4 > 5.