RichestChemical company limited

Vat Dyes

Vat dyes are a class of dyes that are classified as such because of the method by which they are applied. Vat dyeing is a process that refers to dyeing that takes place in a bucket or vat. Almost any dye, including fiber-reactive dyes, direct dyes, and acid dyes, can be used in a vat dye.

Vat Dyes		Dyeing depth(%,o.w.f)	C.I.No. Vat	Fastness						Dyeing method
Light(xenon)	Washing(95°C)			Rubbing		Perspiration CH
	Color Sample	Names of Vat Dyes		CH	CO		Dry	Wet
	Red 6B	4.3	R13	7-8	4	4-5	3-4	1-2	4	IN
	Scarlet R	4.0	R29	4-5	3-4	4-5	3-4	2-3	4	IW
	Blue BC	5.0	B6	7-8	4-5	5	4-5	4-5	4-5	IN
	Dark Blue VB	3.5	-	7-8	3-4	4-5	4	2-3	3-4	IN
	Green GN	4.0	-	5	3-4	4-5	4	3	4	IN
	Brown LG	4.0	Br23	4-5	3-4	4-5	3-4	2	3-4	IN
	Black RB	10.0	BK9	7-8	3-4	4-5	3	2-3	3	SR II
	Black DB	10.0	BK38	6-7	3-4	4	3-4	2-3	3	IN

Application of Vat Dyes

1.　   Procedure

1.1 　Open bath
        Wetting with water -> dyeing -> washing with cold water -> Oxidizing -> Washing with cold water -> Soaping -> Washing with hot water -> Washing with cold water -> Hydroextracting -> Drying.
1.2 　Jig Dyeing
         Wetting with water -> Dyeing -> Washing with cold water -> Oxidizing -> Soaping -> Washing with hot water -> Washing with cold water -> Drying.
1.3 　Pad-steam process
        Pigment padding -> Drying -> Cooling -> Chemicals liquor padding -> Steaming -> Washing with cold water -> Oxidizing -> Washing ->soaping -> Washing -> Drying.

2.　   Dyeing Recipes

Dyeing condition Amount of dyestuff (%)	Dyeing method
	IN			IW			SR II
	0.1-1	1-3	3-6	0.1-1	1-3	3-6	0.1-1	1-3	3-6
Caustic soda 30%(ml/l)	10-12	12-17	17-20	6-8	8-12	12-14	22-25	25-32	32-38
Hydrosulphite 85%(g/l)	4-5	5-7	7-8	3.5-4.5	4.5-6.5	6.5-7	4-5	5-7	7-8
Wetting agent 10%(ml/l)	5	5	5	5	5	5	5	5	5
Alcohol 95%(ml/l)	5	5	5	5	5	5	5	5	5
Sodium sulfate anhydrous (g/l)	-	-	-	5-10	10-15	15-25	-	-	-
Reduction temp. (°C)	60			50			60
Dyeing temp. (°C)	60			45-50			80

3.   Pad-steaming recipes

Dyeing method	Dyeing depth	Caustic soda (g/l)	Hydrasulphite 85% (g/l)	Common salt of Sodium sulfate (g/l)	Steaming time (secs)	Steam temp. (°C)
Pad-steam	Pale-Medium	10-30	10-30	20-30	30-60	102-104
	Medium-Deep	30-40	30-40	30-40

4.   Stock Vat Recipe

Process	SVI	SVII	SVIII
Liquor ratio	1:50	1:50	1:100
Caustic soda 30% (g/l)	60	30	60
Hydrosulphite 85% (g/l)	15	10	15
Vatting temp. (°C)	60	50	60
Vatting time (min)	10-15	10-15	10-15

5.   Oxidizing both Recipe

Method	Sodium Perborate	Hydrogen peroxide 30%	Potassium(sodium bichromate)
Amount	3-4g/l	2-3ml/l	1-2g/l
Glacial acetic acid	-	-	1-2ml/l
pH	10-11	9-10	-
Temp. (°C)	40-50	20-40	30-40
Time (min)	10-20	10-20	10-20

6.   Soaping Bath Recipe

Soap:     3-5g/l
Sodium carbonate:     2-3g/l
Temp:     98-100°C
Time (min):     10-12


Remark：the above recommendations concerning to the use of our products should be modified, if necessary to conform with local conditions and materials used.

VAT RED F3B

Matching Product for Reference

Dyeing Depth	Fabric specification 40sX 40s 133X72	Dyeing Durability
		Solarization	Soaping (95°C)		Sweat stains (acid)		Sweat stains] (alkali)		Ironing	Rubbing		Chlorine bleach
		/	Original sample change	Calico colouring	Original sample change	Calico colouring	Original sample change	Calico colouring	/	Dry	Wet	/
		6-7	4-5	4-5	4-5	4-5	4-5	4-5	4	4	3	4

National standard of P.R.C.: Testing method of vat dyes color and durability: according to GB2377-80
Products testing method:
Dyeing method:
Dyeing conditions

Dyeing depth(dye volume is calculated on fabric volume)	%	0.1-1	1-3	3-6
30% sodium hydroxide	m/l	6-8	8-12	12-14
85% sodium hydrosulfite	g/l	3.5-4.5	4.5-6.5	6.5-7
10% penetrant	m/l	5	5	5
95% ethanol	m/l	5	5	5
Anhydrous sodium sulfate	g/l	5-10	10-15	15-20
Reduction temperature	°C	50		/
Dyeing temperature	°C	4.5-50		/

Technical process of dyeing

1.   Exhaust dyeing
      Dyeing -Cool rinsing -Oxidation-Cool rinsing-Soaping -Hot rinsing-Cool rinsing-Dehydration-Drying
2.   Jig dyeing
      Dyeing-Rinsing-Oxidation-Soap boiling-Hot rinsing-Cool rinsing-Drying
3.   Pad-steam process
       pad dyeing -Drying-Cooling in the air-Pad chemical liquor-Steam-Cool rinsing-Oxidation-Rinsing-Soap boiling-Rinsing-Drying




VAT DYES		Dyeing Depth(%)	Fastness						Dyeing method
Colour Sample	Names of Vat Dyes		Light (Xenon)	Washing (95°C)		Rubbing		Perspiration
				CH	CO	Dry	Wet
	Or 1	2.0	6-7	4-5	4	4	3	4-5	IK
	Or 9	2.0	5-6	4-5	5	4-5	4	4-5	IN
	Or 2	3.0	5	4-5	4-5	4-5	3-4	4-5	IN
	Or 7	3.0	6-7	5	5	4-5	3-4	4-5	IN
	R 15	4.0	6-7	4-5	4-5	4-5	3-4	4	IN
	Br 72	3.0	6	4	4-5	4-5	3-4	4	IN
	Br 3	3.0	7-8	5	5	4-5	4-5	4	IN
	Br68	3.0	5	3-4	4-5	4	3-4	3-4	IN
	Br 1	3.0	7-8	5	5	4-5	3-4	4-5	IN
	Bk 25	3.0	7-8	4-5	4-5	4	3	4	IN
	G 3	3.0	7-8	4	4-5	4	3-4	4	IN
	G 13	3.0	7-8	4-5	5				IN
	G 1	3.0	7-8	4-5	5	4-5	4	5	IN
	G 8	3.0	7-8	5	5	4-5	2-3	4-5	IN
	V 1	2.0	6	4-5	4-5	4-5	4	4-5	IN
	V 9	3.0	6	4-5	5	4-5	4	4-5	IN
	B 20	4.0	7-8	4-5	5	4-5	2	4-5	IN
	B VB	3.5	7-8	3-4	4-5	4	2-3	3-4	IN
	B 4	3.5	7-8	4-5	5	4	3	4-5	IN
	B	4.0	6	3-4	3-4	4	3	4	IN
	Bk 29	2.0	6-7	4-5	5				IN
	Bk 16	2.0	6-7	4.R	4-5			4-5	IN
	Bk 8	4.0	7-8	4-5	5	4-5	4-5	4-5	IN
	Bk	10.0	6	3-4	3-4	4	3	4	IN