Pigment printing

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Pigment printing

  1. 1. PIGMENT PRINTING <ul><li>DIFFERENCE BETWEEN DYE AND PIGMENT </li></ul><ul><li>PIGMENT </li></ul><ul><li>NO AFFINITY TO FIBRE </li></ul><ul><li>INSOLUBLE IN WATER </li></ul><ul><li>NEED BINDER FOR FIXATION ONTO FIBRE </li></ul><ul><li>DYE </li></ul><ul><li>AFFININTY TO FIBRE </li></ul><ul><li>WATER SOLUBLE OR CAN BE MADE WATER SOLUBLE. EXCEPTION DISPERSE DYE </li></ul><ul><li>HELD ON FIBRE DYE-FIBRE INTERACTIVE FORCES </li></ul>
  2. 2. BINDER <ul><li>IT IS PRE-POLYMER AVAILABLE IN THE FORM OF AQUESOUS EMULSION </li></ul><ul><li>CHEMICAL NATURE </li></ul><ul><li>COPOLYMER OF STYRENE-BUTYL ACRYLATE-N-METHYLOL ACRYL AMIDE </li></ul><ul><li> </li></ul>
  3. 3. MECHANISM OF BINDING <ul><li>SEQUENCE </li></ul><ul><li>PRINT > DRY > CURE </li></ul><ul><li>DURING CURING: BINDER POLYMERISES AND FORMS A STRONG FILM </li></ul><ul><li>BINDER FILM EMBEDES PIGMENT COLOUR AND ALSO STRONGLY ADHARES TO THE FIBRE </li></ul>
  4. 4. CHOICE OF THICKENER <ul><li>CONVENTIONAL THICKENER USED FOR DYE PRINTING ARE NOT SUITABLE </li></ul><ul><li>THEY INTERACT WITH BINDER AND REDUCE ITS INTERATION WITH FIBRE. THUS AFFECTING THE FASTNESS PROPERTIES </li></ul><ul><li>SUITABLE THICKENERS </li></ul><ul><li>EMULSION THICKENER – ZERO SOLID CONTENT THICKENER </li></ul><ul><li>SYNTHETIC THICKENER - VERY LOW SOLID CONTENT THICKENER </li></ul>
  5. 5. EMULSION THICKENER <ul><li>OBTAINED BY EMULSIFICATION OF TWO IMMISCIBLE LIQUIDS WITH THE HELP OF EMULSIFIER </li></ul><ul><li>TWO TYPES </li></ul><ul><li>OIL-IN-WATER EMULSION </li></ul><ul><li>WATER-IN-OIL EMULSION </li></ul><ul><li>COMMONLY USED IS OIL-IN-WATER </li></ul>
  6. 6. PREPARATION OF OIL-IN-WATER EMULSION <ul><li>BINDER 100 PARTS </li></ul><ul><li>WATER 100-150 PARTS </li></ul><ul><li>EMULSIFIER 20 PARTS </li></ul><ul><li>UREA 20 PARTS </li></ul><ul><li>CMC (4-6% PASTE) 10 PARTS </li></ul><ul><li>KEROSENE OIL 750-800 PARTS </li></ul><ul><li>MINERAL TURPENTINE </li></ul><ul><li>OIL </li></ul><ul><li>VERY SLOW ADDITION OF OIL </li></ul><ul><li>CONTINUOUS HIGH SPEED STIRRING </li></ul><ul><li>EMULSIFIER: REDUCE SURFACE ENERGY BETWEEN OIL AND WATER </li></ul><ul><li>UREA: HYGROSCOPIC AGENT, MINIMIZE WATER EVAPORATION IN CONTINUOUS PHASE </li></ul><ul><li>CMC: PROTECTIVE COLLOID </li></ul>
  7. 7. EMULSION THICKENER <ul><li>MERITS </li></ul><ul><li>IDEAL FOR PIGMENT PRINTING </li></ul><ul><li>DEMERITS </li></ul><ul><li>INFLAMMABLE- FIRE HAZARDS </li></ul><ul><li>AIR POLLUTION </li></ul><ul><li>HIGH COST </li></ul><ul><li>FABRIC SMEES DUE TO RESIDUAL k.OIL OR MTO. NOT ACCEPTABLE IN EXPORT MARKET </li></ul>
  8. 8. SYNTHETIC THICKENER <ul><li>CHEMICAL NATURE </li></ul><ul><li>HIGH MOL.Wt. COPOLYMERS OF ACRYLIC OR METHACRYLIC ACID </li></ul><ul><li>HAVE FREE –COOH GROUPS ON POLYMERIC CHAINS WHICH A ROLE IN VISCOSITY BUILD UP </li></ul><ul><li>TRADE PRODUCTS: AQUEOUS EMULSION, ACID pH </li></ul><ul><li>CONCENTRATION FOR PRINTABLE VISCOSIT 1-2% </li></ul>
  9. 9. MECHANISM OF THICKENING <ul><li>SYNTHETIC THICKENER IN ACID FORM </li></ul><ul><li>WATER INSOLUBLE, LOW VISCOSITY, NON-IONIZED –COOH GROUPS </li></ul><ul><li>SYNTHETIC THICKENER IN NEUTRIZED FORM </li></ul><ul><li>WATER SOLUBLE, SWELLABLE, HIGH VISCOSITY </li></ul><ul><li>IONIZED –COOH GROUPS </li></ul>
  10. 10. SYNTHETIC THICKENER <ul><li>MERITS </li></ul><ul><li>NO AIR POLLUTION </li></ul><ul><li>NO RISK OF FIRE AND EXPLOSION </li></ul><ul><li>NO SPECIAL STORAGE REQUIREMENTS </li></ul><ul><li>NO FABRIC SMELL </li></ul><ul><li>DEMERITS </li></ul><ul><li>ELECTRLYTE SENSITIVITY </li></ul><ul><li>SLIGHTLY DULL PRINTS AND HARSH FABRIC FEEL </li></ul><ul><li>LONGER DRYING TIME </li></ul>
  11. 11. PREPARATION OF THICKENER PASTE <ul><li>BINDER 100 PARTS </li></ul><ul><li>WATER 80-890 PARTS </li></ul><ul><li>SYNTH. THICKENER 10-20 PARTS </li></ul><ul><li>LIQUOR AMMONIA TO pH 8 </li></ul>
  12. 12. PRINT PASTE COMPOSITION <ul><li>PIGMENT COLOUR X PARTS </li></ul><ul><li>THICKENER PASTE TO MAKE 1000 PARTS </li></ul><ul><li>DIAMM. PHOSPHATE 10 PARTS </li></ul><ul><li>MELAMINE FORMALDEHYDE 10 PARTS </li></ul><ul><li>SEUENCE </li></ul><ul><li>PRINT > DRY > CURE AT 140-150 0 C FOR 4-5 MIN. </li></ul><ul><li> NO WASH </li></ul>
  13. 13. MERITS AND DEMERITS <ul><li>PRACTICALLY ALL TYPES OF FIBRES AND BLENDS CAN BE PRINTED </li></ul><ul><li>PIGMENT COLOURS CAN BE READILY MIXED WITH EACH OTHER TO GET QUICK SHADE MATCHING </li></ul><ul><li>NO AFTER TREATMENT SUCH AS WASHING, SOAPING REQUIRED </li></ul><ul><li>DEMERITS </li></ul><ul><li>HARSH FABRIC FEEL DUE TO BINDER FILM </li></ul><ul><li>LOW RUBBING FASTNESS </li></ul>

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