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Reactive Dyes

Reactive HE Brand Dyes (Bis-Monochlorotriazine)

Properties | Shade Card | Dyeing Procedur

Properties:

REACTIVE HE BRAND DYES are suitable for dyeing cotton and other cellulosic materials. These dyes possess significantly higher exhaustion and fixation efficiency, which results in appreciable cost reduction, in comparison to conventional reactive dyes. The high fixation and good build up are of particular importance when dyeing polyester/cellulosic blends and wash liquor : goods ratio is quite high. Due to higher fixation of HE dyes, the drained and wash liquors after dyeing contain much less quantity of unfixed dyes, in comparison to conventional reactive dyes, which is of interest when pollution control is a major concern to everybody. This facilities quicker wash off and efficient soaping. The improved stability of HE dyes gives improved batch to batch consistency. Exhaustion of HE dyes can be controlled by salt addition and temperature to give level dyeing before alkali addition.

The other useful features of HE dyes are as under:

Excellent build-up in high as low liquor: Goods ratios.

The high fixation is of particular importance when dyeing polyester/ cellulose blend when liquor/goods ratio is quite high. Under the circumstances, conventional reactive dyes show low dyeing efficiency and poor build-up.

Excellent reproducibility.

Wide applicability on yarn, piece material, loose stock and garments.

Wide choice of equipment to suit particular application.

Shade Card:

0.5% DYEING 4.0%	REACTIVE HE Brand Dyes (Bis-Monochlorotri- azine)	C.I. No.	General Properties			Fastness Properties					Suitability
			Affi- nity	Solubi lity at 30⁰C	Dis charge ability	Day Light 1/1 & 1/6	Wash ing ISO4	Perspi- ration		Hypo- chlorite Bleach	Pero- xide Bleach	Exhaust Dyeing	One Bath Pad Stream
			Affi- nity	Solubi lity at 30⁰C	Dis charge ability	Day Light 1/1 & 1/6	Wash ing ISO4	Alka- line	Acidic	Hypo- chlorite Bleach	Pero- xide Bleach	Exhaust Dyeing	One Bath Pad Stream
	Yellow HE6G	Y.135	H	70	G	4 5	5	4	4-5	3	3	+	(+)
	Yellow HE4G	Y.105	H	100	F	4-5 5-6	5	4	4-5	2	4-5	+	(+)
	G Yellow HER 110%	Y.84	H	100	F	5 6	5	4	4	3	4-5	+	(+)
	Orange HER	O.84	H	40	P	3-4 4-5	5	4	3	3	4	+	-
	Redm HE3B	R.120	H	90	P	4 5	5	4-5	4	3	4	+	-
	Red HE7B	R.141	H	100	P	3-4 4-5	4	4-5	4	3	4-5	+	(+)
	Red HE8B	R.152	H	80	P	3-4 4-5	4	4	4-5	2	4-5	(+)	-
	Brill.Blue HERD	B.160	H	90	F	5 6	5	5	1	4-5	+	(+)	-
	Navy Blue HER 150%	B.171	H	100	F	4 5	4-5	5	4-5	3	4-5	+	(+)
	Blue HEGN 125%	B.198	M	100	G	5 6	4	5	5	3	4	+	(+)
	T Blue HA	B.71	M	100	G	5 6	4	5	5	3	5	+	(+)
	Green HE4BD	G.19	H	100	GF	4 5	4-5	4	4	2	2-3	+	(+)
	Black HEBL	Bl.160	H	100	P	4 5	4	3	4	3-4	4-5	+	(+)

Key to Abbreviations

Affinity or Substantivity on cotton
L	= Low	+	= Suitable
M	= Medium	(+)	= Fairly Suitable
H	= High	-	= Not Suitable
V	= Very High

Dischargeability	: G = Good; F = Fair; P = Poor
Light	: 1 to 8 in increasing order
Washing & other	: 1 to 5 in increasing order

Y	= Yellow	O	= Orange
R	= Red	V	= Violet
B	= Blue	Br	= Brown
Bl	= Black	G	= Green

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Dyeing Procedure:

DYEING METHODS

Winch, jet, package & beam dyeing machines

These dyes are specially designed for exhaust dyeing methods. The dyeing method selection depends upon the type of substrate to be dyed and the machinery to be used for dyeing.

Depth of Shade	Salt
Depth of Shade	Unmercerised cotton(gm/l)	Mercerised cotton or Viscose Rayon	Soda Ash (gms/l)	Fixation time (min.)
Upto 0.10%	10	5	10	30
0.11-0.30%	20	10	10	30
0.31-0.50%	30	20	10	45
0.51-1.00%	45	30	15	45
1.01-2.00%	60	40	15	45
2.01-4.00%	70	55	20	60
Above 4.00%	90	65	20	60

Method No. 1 : Salt addition in portions (suitable for mercerized yarn)

This process is recommended for non-circulating liquor machinery and it is suitable for all depths of shade.

Method No. 2 : Salt addition at start (Suitable for unmercerised yarn)

This method is recommended for machines with liquor circulation and it is suitable for medium to heavy depth of shades.

Method No. 3 : Both salt & alkali addition at start

The method is recommended for machines with liquor circulation, primarily for the dyeing of medium - heavy binary combinations. It is suitable for unmercerised cotton.

Note 1: A mixture of soda ash and caustic soda is recommended alkali for this method.

Depth of Shade	Soda ash gms/l	Caustic Soda 100% gms/l
Upto 1.0%	5	0.2
1.01 to above	5	0.5

Method No. 4 : (Dyeing Pale Shade) (Garment dyeing)

The method is recommended for machines with microprocessor controlled addition system for dyeing pale shades (less than 0.5% depth) and for all shades on mercerized cotton & viscose packages

Method No. 5 : Isothermal Method (Dyeing heavy shades garment)

The method is recommended for machines with microprocessor controlled addition systems for medium to heavy depths ( >than 0.5% depth) on unmercerised cotton.

Dyeing method for Jigger machines

Due to high temperature dyeing the problems of off-shade selvedges of too pale selvedges are often encountered in dyeing with these machines. The following precautions hence should be taken to avoid such problems.

To use closed type jiggers so that a uniform temperature is possible across the width of fabric.
Batch the fabric evenly.
Maintain the dye bath at minimum of 85-90^oC during salt stage.
Adjust the dye bath temperature 85-90^oC to ensure that fabric is maintained at minimum 80^oC during alkali addition stage.

Procedure

Set the dye bath at 90^oC with resist salt 2 gms/l. Now add 1/2 amt. of dye and run one end. Then add remaining 1/2 amt. & run another one end. Add 1/2 amt. of salt & run one end. Add remaining 1/2 amt. Of salt and run another end. Maintain 80^oC temperature continue to run for 2 ends. Now add 1/2 amt. of soda ash & run for one end. Then add remaining 1/2 amt. Soda ash & run for another one end. Then add remaining 1/2 amt. soda ash & run for another one end. Then run for 4 ends or more if required & wash. (1 end =10 minutes)

Dyeing method for cotton / polyester blend

The one bath two stage dyeing method for polyester / cotton blend is applicable on jet, beam or package dyeing machines.

2 gm/l Buffer pH 5 (5.5)	X% GAAYACTIVE 'HE' dye
1 gm/l Anionic dispersant	50 gms/l Salt
X% Disperse Dye	15 gms/l T.S.P. Soda ash

Salt and alkali requirements

Depth of Shade % on total weight of goods	Salt (gms/l)	Soda Ash (gms/l)
Upto 0.2%	15	10
0.21-0.4%	20	15
0.41-0.80%	30	15
0.81-1.6%	50	20
Aabove 1.6%	70	20

Washing - off procedure

In order to obtain maximum wet-fastness properties, brightness and purity of shades with consistent dyeing results, it is essential to give a through 'Soaping' to clear-off unreached hydrolyzed dye form the dyed fabric.

The dyed fabric is rinsed repeatedly in cold water to remove most of the alkali, salt and unfixed dye present and rinse again in warm water not higher than 60^oC. then run in a bath containing:

Anionic detergent - 1-2 gms/liter for 15 minutes at the boil. Then rinse in warm water (up to 60^oC) and finally in cold water. The most satisfactory results in washing-off, particularly for piece goods, are obtained by employing an Open soaper or perforated beam-washing machine. If such equipments are not available, conventional ones like jig or winch may be used. For yarn in the hank form open-vat is employed and for yarn in packaged form the package-dyeing machine itself used.

The information and procedure provided here is in good faith and to the best of our knowledge, but without liabilities.

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Properties | Shade Card | Dyeing Procedur