The appearance of Vat Blue 5 (bromo indigo blue) is dark blue powder. It is insoluble in water and alcohol; soluble in xylene, tetrahydronaphthalene, nitrobenzene. It is blue-green in concentrated sulfuric acid, blue after dilution and precipitated. Dye in alkaline powder The leuco body formed in the solution is yellow, and the acid insurance powder solution is pale yellow.
TRADE NAME:Bromo indigo blue,Bromo Indigo,Indigo Blue 4B,Bromo Indigo 2B
Key Features
- Deep navy to clean mid-blue tone with excellent shade build-up
- Outstanding light and wash fastness for workwear and outdoor textiles
- Low solubility in oxidized form; resists bleeding and crocking after proper soaping
- Compatible with pad-steam, pad-dry-pad-steam, and exhaust dyeing on cellulosics
- Good levelness with controlled reduction potential and alkali
- Suitable for denim alternatives, piece dyeing, and yarn dyeing
- Stable shade on mercerized cotton and high-twist yarns
- Low migration once oxidized; helps maintain sharp patterns in resist/ikat styles
- Good chlorine and perspiration resistance in finished goods
- Can be combined with vat yellows/reds to formulate dark greens and violets
Technical Specifications
- CAS NO: 2475-31-2
- CI.NO: 73065
- Molecular Formula: C16H6Br4N2O2
- Molecular Weight: 577.85
- Shade: Dark blue powder
Dyeing depth g/L | 30 |
Dyeing method | IN |
Leuco color | Blue |
Leveling property | ▲▲ |
Dead cotton | △ |
Light (Xenon test 1/12) | 6-7 |
Light (Xenon test 1/1) | 7-8 |
Light (Xenon test 2/1) | 7-8 |
Application Features
Dyeing method | Dyeing temperature(℃) | Reduction Method | Reduction temperature (℃) | Leveling Property | Other properties |
most suiable for special method ,also can be used B | 50~60 | Dry Cylinder | 60~80 | Good | Not resistant to alkali cooking |
Colour Fastness Test
Light fastness | Soapping(95℃) | Perspiration | Rubbing | Ironing | Bleaching resistant | Mercerized |
standard depth | 1/12 depth | orginal color changed | white fabric stained | orginal color changed | white fabric stained | dry | wet | immediately | 4hafter | Chlorine bleaching | oxygen bleaching | orginal color changed | white fabric stained |
4~5 | — | 4~5 | 5 | 4 | 5 | 5 | 4~5 | — | 4~5 | 2 | 4 | 4 | — |
Application:
Vat Blue 5 Mainly used for cotton of jig dyeing and yarn dyeing, dyeing hair blue cloth color turquoise blue. Is the important dye printing, can direct printing, also can discharge printing and resist printing. Can also be used for viscose, silk and wool dyeing, levelness and affinity are good. Can be processed into organic pigment
Usage:
- When bromine indigo is used for cotton product dyeing or dip dyeing, it is most suitable to use special method. It can also be used in B method, but it can be dyed without salt. It needs to be reduced by dry cylinder. The drying time of dry cylinder needs 10~15min, temperature 60~ 80 ° C, dry cylinder stabilization time is more than 60min.
- The bromine indigo leuco body has higher affinity for cotton fiber and good leveling property. The dyeing curve is shown in Figure 4-5-22. The hiding power of dead cotton is very poor. It should not be washed after dyeing, it should be oxidized in air first. Or put directly into the oxidation bath
- Oxidation of (hydrogen peroxide or sodium perborate). After oxidation, it is fully scented by soaping. It is mainly used for cotton yarn dyeing and cotton cloth dyeing, and is generally not used for suspension padding.
- Bromoindigo is one of the important dyes for vat dyes in cotton printing. It is suitable for direct printing, but also for discharge and anti-dye printing.
- When the color paste is prepared by the non-pre-reduction method, caustic soda or potassium carbonate is used as the alkali agent, but the color shade is greenish; if the printing paste is prepared by the pre-reduction method, the caustic soda is used as the alkali agent, and heated to 50 ° C, only the white powder is added. Add insurance powder, the color is bright and blue, but the amount of color is not high without pre-reduction method. The printing and dyeing steaming time should not be too long, so as not to affect the normal color development. It is better to use sodium perborate or air to ventilate. When used for printing, in addition to being used as the main color alone, it is often combined with a reduced brown RRD to adjust the color.
- Bromine indigo is suitable for the dyeing of viscose fiber, and has good leveling property and affinity. It can also be used for the dyeing of cotton blended fabric, but the color of the dye is slightly darker than cotton.
- The bromine indigo printing and dyeing fabric is finished by BHES resin, and the color light turns green and dark.
Precautions
1.Vat Blue 5 (Bromo indigo blue) is not resistant to alkali cooking and chlorine bleaching, so it can not be used for color fabrics that require alkali boiling and chlorine bleaching. When dry treatment is encountered after printing, the concentration of bleaching liquid should be properly controlled and kept consistent.
2. When bromine indigo is used for large-area printing, the oxidation color must be sufficient. Immediately after oxidation, it should be soaped to prevent the printed fabric from being colored when it is left in a wet state. Soaping should be carried out at 90~95 °C, otherwise When the finished soap is washed, the fading fastness is poor, the green light is heavy and the color is wilted.
3.Vat Blue 5 should be stored in a dry, ventilated place to avoid moisture.
