Colour Chronicle - June 2013
Colour Chronicle - June 2013
Colour Chronicle - June 2013
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TEXTILE<br />
Dyeing Polyamide<br />
with Acid Dyes<br />
pH dependence<br />
Dyeing behavior of polyamide<br />
fibres :-<br />
Combinability of acid dyes<br />
Dyeing behavior of polyamide fibres is<br />
heavily influenced by the following factors:<br />
– polyamide quality : PA 6/PA 6.6<br />
– mechanical influence : drawing/texturizing<br />
– heat treatment: presteaming/hot air setting<br />
These influences change the kinetics of the<br />
fibre with respect to acid dyes.<br />
Dye Properties<br />
Relative rate of exhaustion<br />
(Compatibility values) CV, C’V)<br />
pH dependence<br />
(at 2/1 SD applied amount)<br />
100<br />
CV=2<br />
slow<br />
rapid<br />
100<br />
low<br />
high<br />
80<br />
80<br />
60<br />
40<br />
CV=4<br />
60<br />
40<br />
20<br />
20<br />
0<br />
0 30 60 90 120 150 min<br />
30 98 98 ˚C<br />
Time/temperature<br />
Migration power<br />
(Compatibility values CV, C’V)<br />
0<br />
4 5 6 7 8 9<br />
pH of the dyeliquor<br />
Saturation concentration<br />
100<br />
80<br />
high<br />
dyeing<br />
low<br />
% depth<br />
60<br />
40<br />
20<br />
0<br />
addition<br />
0 15 30 45 60 75 90<br />
migration time<br />
8 COLOUR CHRONICLE__JUNE <strong>2013</strong>
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