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Jktan BN is supplied in the
form of white powder. It consists of cationic aluminum
salts, so special attention should be paid to its
compatibility with anionic products such as sulphonated
fatliquors. It is fully compatible with cationic
fatliquors.
Jktan BN has pronounced
astringent action on leather fibers. It can be used in
chrome tannages to allow firm leathers to be made from
raw stock that has a tendency to sponginess and a loose
grain. In chrome retannages, this effect is mainly
concentrated on the external layers of the skin, with
the result that the leather can later be buffed to a
fine dense nap.
Jktan BN can also be
employed in the production of wet white leather. It is
used in pretannages that are applied to pelts to
stabilize them in order to allow them to be split and
shaved. Only a small amount of Jktan BN is required in
order to obtain a shrinkage temperature of 75 C
Jktan BN forms hybrid
complexes with our chromitan types and other cationic
chrome salts, especially if they are added to the float
in powder form. The tanning action of complexes of this
type is such that soft leathers can be obtained with a
compact structure and tight grain. This consolidating
action cannot be obtained with conventional mixtures of
chrome and aluminum tanning agents.
The
advantage of high basicity of Jktan BN is that the
leather has excellent affinity for anionic dyes such as
acid dyes and direct dyes after it has been treated with
Jktan BN. The shade of dyed leathers is much deeper and
fuller, and their fastness is higher. |
