1.Properties:
Fluorescent Whitening Agent VBA has very good water solubility.Its water solution is anionic and has a blue fluorescence.This whitening agent can be used in a bath together with almost all auxiliaries other than cationic surfactant and cationic dyes,and has very good whitening effect on cotton fabric even under strong alkalic or acidic conditions.
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2.Bath formulate(for reference):
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| Recipe A(one-bath process) |
| Scouring agent |
2g/l |
Penetrant |
2g/l |
| Stabilizer |
2g/l |
Caustic soda(100%) |
6g/l |
| H2O2 |
12g/l |
Whitening agent VBA |
0.3% O.W.F |
| (Bath ratio:1:15; boil out the goods being whitened at 95-98°C for 60 minutes, then rinse and dry it.) |
| Recipe B(used together with resin in padding bath) |
| Resin 2D |
64g/l |
Whitening agent VBA |
3g/l |
| Citric acid(10%) |
5ml/l |
Penetrant and softener |
some |
| Catalyst |
6g/l |
- |
- |
| (Exhaust twice and pad twice;adjust the PH value to 5-6; dry the whitened goods at 80-100°C,cure it at 140-180°C,then open-wash it for 20-30 seconds and dry it again.) |
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3.Specifications:
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| Item |
Indices |
| Appearance |
light yellow even-sized powder |
| E Value |
100% of the standard agent |
| Hue |
slightly different from the standard agent |
| WCIE (whiteness different between VBA and the standard agent) |
≥-3.0 |
| Moisture content |
≤5% |
| Content of insoluble impurities |
≤0.5% |
| Fineness(quantity of residue on sieve having 180um meshes) |
≤10% |
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4.Packaging and storing:
Packaged in cardboard barrels,25kg or 50kg each.Stored in cool and dry place.
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