Pigment printing and different techniques of pigment printing

This pptx summerize the point about pigment and pigment printing

1. Pigments are insoluble colouring matter mostly mineral origin have been used for the colouration of metal wood, stone, and textile material. Trade name of pigments: Trade name : Manufacturer Country Acranium Bayer W.Germany Acron Parckh Dye crop W. Germany Aquabond / Aquaprint Inmount crop USA Helizarine BASG Ag G ermany Imperon Hoechst Germany Noepralae Francolor France Seabond , lifebond HDC Company USA Syntrofix Syndex pvt.ltd India. Pigment Printing

2. Structure and characteristics of pigments : Quinacridone : Characteristics: These give yellow to violet pigments by chelation with different metals. Mn and Ni chelates have better light fastness.

3. Dioxazine : Yellow, red, orange, violate, and blue pigments can be obtained from these.

4. Fluorubine : Grenish yellow pigments with very good all round fastness properties and useful for dope dyeing.

5. Isoindolinone : These give greenish yellow, red, and brown pigments.

6. Basic principle: Material necessary for pigment printing: Pigments( Multi colour ) Film former(Binder)(Polymeric material) Cross linking agent(Fixer) Catalyst (To accelerate X-linking) Wetting agent Etc. Cross linking is occurred in Acetic Acid medium in pH=(5-5.5)

7. Functions of ingredients of print paste in pigment printing: The functions of the ingredients of the print paste of pigment printing are mentioned below: Pigment : Pigment impart colour to the print. Binders & Fixers : Binders are long chain polymer macromolecules. They imparts stickiness and plasticity to the print paste. They help to adhere the pigment particles on the fibre surface. Fixers are cross linking printing agents which help the binders in their functioning, Catalyst : Catalysts promote the cross linking reaction, leading to fixation of the binder to the fabric. Catalysts are acid liberating agents which under suitable conditions initiate the cross linking reactions.

8. Characteristics of a good binder: Binders and fixers play important rolls in pigment printing in achieving optimum fastness properties. Binder is a film forming substance made up of long chain macro molecules which when applied to the fabric form three dimensional X- linked network. The characteristics of a good binder are mentioned below: It should not impart any harsh and stiff handle to the fabric. It should create a soft handle. It should impart good rubbing and washing fastness property to the printed fabric. It should not impart any unhygienic or bad chemical effect on the print.

9. 4.It should form a film like coating on the fabric during the curing process and should have good sticking capacity to hold the pigment particles together. 5.The coating produced by binder should be transparent. 6.It should be cheap and available and should have a long lasting effect on printed fabric.

10. Required Properties of Pigments: Pigments should have good covering power. Pigments should have freely mixing properties. Pigments should be chemically inert. Pigments should have good resistance to acid. Pigments should be resistance to solvent. Pigments should have suitable brilliance , hardness, and stability. Pigments should have good wet , light, and abrasion resistance. Pigments should have good characteristics for excellent dispersion including : Particle size Electrical charge Specific gravity Purity and crystalline structure Should be applied to all fibre & cheap.

11. Pigments printing: Pigment-------30 parts Binder---------600 parts Fixer-----------10 parts Na alginate---100(50% solution) White sprit---250 parts ______________________ Total 1000 parts After printing the fabric is dried and cured for making X- linking of the binder film with the fabrics.

12. Pre treatments Printing (with binder & fixer) Drying (110-120ºC) Curing (Cotton 140-160ºC, 3 – 5 min) (Polyester 160 - 220ºC 30 – 60s) Washing (Some time it is not need) Stenter Dryer Roller/Rotary printing Process:

13. Advantage and Disadvantage of Pigment Printing Advantage: Applicable to natural and synthetic fibre Wide range of colour can be produced Can be used for dope dyeing for filament yarn. Easy applicable Less expensive Disadvantage: Not controllable for the binder film Use of solvent like kerosene, spirit etc can produce problems like flammability, odor, pollution etc. The jamming up of equipment and air & water pollution is observed . Wet and rubbing fastness is average.