VDI Cold Brand dyes are highly reactive requiring comparatively milder conditions in dye fixation. They are primarily of interest in dyeing at normal room temperature (about 25º - 30º Deg. C) using Soda Ash or Sodium Bicarbonate. VDI COLD BRAND dyes are applicable to cellulosic textiles by Batch-wise, Semi-continuous and Continuous methods in conventional textile machinery like open-vat, Package, Jet, Jig, Winch and padding mangle. The versatility in various application procedures and the availability of wide range of bright and fast shades are the outstanding features of this class of dyestuffs.

General Characteristics of Cold Brand Dyes

Stability

The dyestuff should be stored in cool and dry conditions. The containers should be tightly closed when not in use. High temperature, Humidity and alkaline pH conditions reduce the stability of the dyes in solution.

Water Supply

Soft of the softened water should be employed, avoiding alkalinity especially while dissolving the dyes, when hard along is available, it should be softened with sequestering agents. In dyeing, the pH of the water supply should be within the limits pH -7-8.

Method Dyeing

Receive cold water in the dye bath (Recommended m/l ratio 1 to 15), add required quantity of common salt or gluber salt. Paste required dyes with the water and dissolve by adding water 30º C to same. Add dissolved dye to the dye bath. Enter material, run 15 to 20 minutes. Add required amount of soda ash (as solution), run material for 45 to 60 minutes, squeeze, wash with water and soap at boil with 2g/L soap, wash with water and dry. Soaping treatment is highly essential to remove unfixed dye to produce dyeings of high washing fastness. Standard Exhaust Methods for Cold Brand Reactive Dyes.

					General Properties					Daylight		Washing Fastness				Fastness Properties
		4%	VDI Reactive C.I. No.	C.I. No.								ISO 3 C	ISO 3 ST	ISO 4 C	ISO 4 ST
			BRILLIANT YELLOW M8G	Yellow 86	L	M	40	70	60	5	6	5	5	4	5	4	1	2	4	2
			BRILLIANT YELLOW M4G	Yellow 22	L	M	40	40	20	5	6	5	5	4	5	5	1	3	2	4
			YELLOW MGR	Yellow 7	H	M	40	30	5	5	6	5	5	5	5	4	4	4	4	5
			YELLOW M3R	Yellow 36	H	H	40	160	130	5	6	5	5	5	5	4	2	4	2	4
			BRILLIANT YELLOW M4R	Orange 14	M	M	40	80	40	4	5	5	5	4	5	4	1	3	1	5
			BRILLIANT ORANGE M2R	Orange 4	M	M	30	180	160	3	4	5	4	5	4	4	4	4	4	4
			BRILLIANT RED M58	Red 2	H	H	40	80	50	4	4	5	4	4	4	3	1	2	2	4
			BRILLIANT RED M8B	Red 11	H	M	30	50	10	4	4	5	5	4	4	4	4	4	4	4
			BRILLIANT SCARLET M2G	Red 8	H	H	40	70	30	4	4	4	4	3	4	4	4	4	4	4
			BRILLIANT MAGENTA MB	Violet 13	H	H	30	20	5	3	3	5	5	5	5	4	1	3	2	4
			BRILLIANT BLUE MR	Blue 4	L	M	40	80	40	6	6	5	5	5	5	5	2	3	3	3
			BRILLIANT BLUE MGX	Blue 163	M	M	40	120	120	5	5	4	5	3	4	4	1	2	3	2
			TURQOUISE BLUE MGN	Blue 140	H	H	60	130	10	4	5	4	3	3	4	4	2	2	3	3
			BRILLIANT BLUE M2R	Blue 81	H	H	40	100	60	2	2	4	5	4	4	4	1	3	2	3
			NAVY BLUE M3R		H	H	60	70	10	3	4	5	4	4	4	3	1	1	2	2
			BLUE M4GD	Blue 168	H	H	40	160	160	4	4	5	5	4	5	4	1	3	4	3