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reactive dye printing
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PRINTING OF COTTON WITH REACTIVE DYESCO-VALENT BOND FORMATION BETWEEN DYE AND FIBREREACTIVE DYES BASED ONSUBSTITUTION REACTION
REACTIVE DYES BASED ON SUBSTITUTION REACTIONDEVELOPED BY ICI IN 1956MARKETED UNDER THE TRADE NAMESPROCION MPROCION HCOLOURED DERIVATIVES OF 2,4,6 TRICHLORO-S-TRIAZINE OR CYNURIC CHLORIDE
PROCION DYESPROCION M DYES (COLD BRAND)DICHLORO TRIZINE
PROCION H DYES (HOT BRAND DYES)MONOCHLORO TRIAZINE
DYES BASED ON ADDITION REACTIONDEVELOPED BY HOECHSTMARKETED UNDER TRADE NAME REMAZOLREACTIVE GROUP VINYL SULPHONECOMMERCIALLY AVAILABLE IN THE FORM BETA SULPHATOETHYL SULPHONE
DYE REACTIVITYPROCION M > REMAZOL > PROCION H
DYE REACTION WITH CELLULOSE AND WATER
CHOICE OF THICKENERTHICKENERS FOR DYES OTHER THAN REACTIVE AND PIGMENT COLOURSCARBOHYDRATES OR MODIFIED CARBOHYDRATES HAVING PRIMARY OH GROUPS IN THEIR STRUCTURENOT SUITABLE FOR PRINTING COTTON WITH REACTIVE DYESSELECTED THICKENER SHOULD BE FREE FROM PRIMARY OH GROUP
SODIUM ALGINATEMOST SATISFACTORY THICKENERSODIUM SALT OF ALGINIC ACID
DOES NOT REACT WITH REACTIVE DYEABSENCE OF PRIMARY REACTIVE GROUPREPULSION BETWEEN COO OF THICKENER AND SO3 - GROUP OF DYE
PRINTINGFABRIC PREPARATIONPREFERABLY MERCERIZEDSHOULD BE NEUTRAL OR SLIGHTLY ALKALINEDYE DISSOLUTIONPRINTING NEEDS CONCENTRATED SOLUTIONUREA ACTS AS DYE DISSOLVING ASSISTANT AND HYGROSCOPIC AGENT
DYE DISSOLUTIONTWO PROCEDURESPASTE DYE POWDER WITH COLD WATER. ADD HOT WATER. THEN ADD UREAMIX DYE POWDER AND UREA. ADD HOT WATERHOT WATER TEMPERATURECOLD BRAND DYES60-700 CHOT BRAND DYES800 C
PRINT PASTE PREPARATION
DYE FIXATION METHODSSTEAMING PROCESSPRINT > DRY > STEAM > WASH > SOAP > WASH > DRYALKALI IN PRINT PASTESTEAMING ATMOSPHERIC STEAMINGTEMPERATURE 1020 CTIME : COLD BRAND 5 MIN., HOT BRAND 15 MIN. DRY HEAT PROCESSPRINT > DRY > CURE > WASH > SOAP > WASH > DRYCURING: 140-1500 C FOR 5 MIN.SODIUM SILICATE PAD-BATCH METHODPRINT > DRY > SODIUM SILICATE PAD-BATCH > WASH > SOAP > WASH > DRYSODIUM SILICATE1000 TWBATCHING TIME 4-12 Hr. ROOM TEMPERATURE
PRINT PASTE COMPOSITION
COMPONENTSTEAM DRY HEAT PAD-BATCHDYE10-40 gm10-40 gm10-40 gmUREA50 gm150-200 gm50 gm
WATER150-200 ml150-200 ml150-200 mlRESIST SALT10-20 gm10-20 gmNILSOD. ALGINATE PASTE (4%)TO MAKE 1000 gmTO MAKE 1000 gmTO MAKE 1000 gm
SOD. BICARB.10-20 gm10-20 gmNIL
ROLE OF UREA IN DRY HEAT FIXATIONHIGH CONCENTRATION OF UREA 150-200 gm/kg OF PRINT PASTEWATER EVAPORATION DURING DRYINGNO WATER AT THE TIME OF FIXATION AT 1500 CNO IONIZATION OF DYE AND CELLULOSENO DYE FIXATIONUREA MELTS AT 1320 CPROVIDE MOLTEN BATH AT PRINTED PORTION AT FIXATION TEMP.DYE DISSOLUTION AND FIBRE SWELLING IN MOLTEN UREAFACILITATE DYE FIXATION
SOAPINGAFTER FIXATION DYE PRESENT ON FABRICDYE REACTED WITH FIBREDYE REACTED WITH WATER (HYDROLYZED DYE)DYE STILL IN REACTIVE FORMOPTIMUM WASH FASTNESS DEPEND ON EFFICIENT REMOVAL OF 1 AND 2SOAPING MOST IMPORTANT OPERATION
SOAPINGCOLD WATER WASH, AMPLE WATER, 2-3 RINSESSOAPING AT BOIL USING 2 g/l LISSAPOL D (ANIONIC DETERGENT) FOR 15 MIN.HOT WATER RINSECOLD WATER RINSEPRECAUSTION: TO AVOID STAINING OF WHITE, SOAPING IN OPEN WIDTH FORM ON 6-8 COMPARTMENT OPEN SOAPER