The appearance of reduced Vat Black 8 (vat grey M) is generally gray-black powder, insoluble in water, acetone, alcohol, chloroform and toluene. It is slightly soluble in o-chlorophenol and pyridine, and is green in concentrated sulfuric acid.
TRADE NAME:Vat Grey M,Vat Grey 6BR,Vat Grey M-T
Dyeing depth g/L | 40 |
Dyeing method | IN SP1. IN |
Leuco color | -- |
Leveling property | ▲▲ |
Dead cotton | ▲ |
Light (Xenon test 1/12) | 6 |
Light (Xenon test 1/1) | 7-8 |
Light (Xenon test 2/1) | 7-8 |
Dyeing Method | Dyeing Tempreture(℃) | VAT Method | VAT Tempreture(℃) | Levelness | Others |
A Method | 50~60 | Dry cylinder, full bath | <60 | general | Sensitive to heat and water stains |
Sun fastness | Soaping(95℃) | Perspiration | Rubbing | Ironing | Bleach resistant | Mercerizing | |||||||
Standard Depth | 1/12 Depth | Sample change | White stained | Sample change | White stained | Dry | Wet | immediately | After 4h | Chlorine bleaching | Oxygen bleaching | Sample change | White stained |
7~8 | 6 | 4~5 | 5 | 4~5 | 5 | 4~5 | 4~5 | 3 | 4 | 4~5 | 4~5 | 4 | 5 |
Vat Black 8 Mainly used in the cotton fabric jig dyeing, dyeing and suspended pad dyeing, also used for Fiber/cotton, polyester-cotton blended fabric two bath set of dye dyeing. Suitable for suspension pad dyeing deep, shallow gray, and can spell dye all kinds of noise. Its main leuco dye yarn, can also be used to viscose and silk dyeing.
1.for jig dyeing of cotton products or disseminated, suitable to use a special method, the dosage of caustic soda should be increased by 30% ~ 40% than general armor method. Such as caustic soda concentration in the dye bath is insufficient, can form the rearrangement of dye molecules, reduction temperature and the dyeing temperature should not exceed 60 ℃, otherwise due to the sensitivity of dyes to temperature makes light brown. It can be used dry cylinder reduction, also can use full bath.
2.The dyeing curve is shown in figure 4 -- 5 -- 41. The covering power of dead cotton is medium. The dye turns red after being boiled with soap.
3.Vat Black 8 can be used for direct printing, but it has poor fixation performance. It can also be used for ice-ground discharge printing.
4.Vat Black 8(VAT grey M) dyed viscose fiber, appropriate USES 60 ℃ dyeing. Dyeing stick cotton interwoven fabric, low temperature dyeing can get uniform color; Such as 50 ℃ in dyeing, part of the color is green and light cotton. Dye whalen, cotton fiber than dark color, and color than red cotton. D cotton blended fabric dyeing, after dark and yellow colours than cotton. Used for polyester/cotton blended fabric (65/35) thermosol dyeing, the polyester with a slight color (dark green light grey), so don't have much use.
5.After finishing with cyanaldehyde and BHES resin, the color of M dyed fabrics with reduced grey color remained unchanged. With trimethyl-trihydroxymethyl melamine, printing paste before the preparation of resin finishing, color is blue than the original.
Vat Black 8 must be handled according to the product SDS. Key points: avoid inhalation of dust, use appropriate PPE during weighing and mixing, store in a cool dry place, and keep away from incompatible oxidizers. Always neutralize and treat spent vat liquor per local regulations. Consult the technical datasheet for recommended vatting practices.
Common industrial practice uses strong reducing agents compatible with vat dyeing systems and alkaline side baths. Auxiliary products such as leveling agents, anti-salt migration agents and wetting agents can improve evenness and penetration. Because equipment and local effluent rules vary, we recommend following supplier-provided recipes and running lab-scale trials first.
For the deepest, neutral black: ensure thorough pre-scouring to remove oils and sizing, use adequate reduction to fully solubilize the dye, maintain good liquor circulation for even uptake, and allow complete oxidation and washing post-fixation to remove leuco residues. Lab-scale A/B testing of vatting time and alkali level will identify the optimum recipe for your fabric.
