Vinabrite ESK
Optical brightener for cellulose and polyamide fibres
PROPERTIES
Chemical character
Appearance
pH-value of a 10 % solution
Ionic character
Stabilities
Stilbene Triazine derivative
Yellow powder
8.0 – 9.0
Anionic
Hypochlorite bleach instable
Chlorite bleach instable
Peroxide bleach very good
Hydrosulphite bleach very good
Stability to acid instable
under pH 4.0
Stability to alkali very good
Stability to water hardness good
The product is not sensitive to frost
DILUTION
VINABRITE ESK is readily dispersible in boiling water.
APPLICATION
VINABRITE ESK is a high-affinitive optical brightener with a bluish/Violet shade
and has a good affinity within the entire temperature range of 30 to 130 oC.
Optical brighteners react very sensitively to heavy metal ions, i.e. even small
amounts of heavy metal ions may impair the degree of whiteness. This problem
can be solved by adding a sequestering agent, e.g. VINAQUEST KEB.
VINABRITE ESK is only suitable for discontinuous long liquor procedures due
to its affinity behaviour and concentrated form.
Cellulose fibers (except cellulose acetate)
RECIPE PROPOSALS
Exhaust procedure
0.05 – 0.2 % VINABRITE ESK
30 MIN AT 50 oC
Application in the peroxide bleach
0.5 – 1.0 % VINAPOL GRN
1.5 – 2.0 % NaoH 100 %
5.00 – 8.0 % H2O2 35 %
0.05 – 0.2 % VINABRITE ESK
60 min at 98 oC
rinse hot and cold Polyamide fibres
Exhaust procedure or application in the reductive bleach
0.1 – 0.4 % VINABRITE ESK
0.5 – 1.0 % VINAPOL GRN
3.0 g/l Reduction agent based on hydrosulphite
0.5 – 1.0 % Acetic acid 60 % (pH 4.0 – 5.0)
30 min at 98 oC
rinse hot and cold