প্রিন্টিং পেস্ট এর উপাদান এবং তাদের কাজ

প্রিন্টিং পেস্ট এর উপাদান এবং তাদের কাজ |
Printing Paste Ingredients and their Functions

Printing Paste Ingredients and their Functions

1. Dyes/Pigments:

Functions:

Attraction of dyestuff to the fiber due to presence of auxochrome.
To achieve color effect on the fabric.
To produce required shade.

Example: Vat, Azoic, Reactive, Direct dye etc.

2. Wetting agents:

Functions:

To wet the fabric as well as dyestuff.
To reduce surface tension of water allowing the dyestuff for easy penetration into fiber.
To obtain smooth paste.
To dissolve the dyestuff in the paste.

Example: Olive oil, T.R oil, Caster oil, Lissapol N, Animal oil, Glycerine.

3. Solvents/Dispersing agents/Solution acids:

Functions:

To get bright design,
To assist dye penetration,
To spread dye molecules evenly in the paste,
Assist dye fixation,
To prevent aggregation of dye molecules in the highly concentrated of the dye.
To prevent precipitation.
To increase solubility of the dyes.
To make proper printing shade.

Example: Urea, Glycerine, Desirable, Alcohol, Acetone, Diethylene glycol, Thio diethylene glycol.

4. Thickener:

Functions:

To give required viscosity to the printing paste
To prevent premature reactions between the chemicals contained in the print paste.
To hold the ingredients of the print paste on the fabric.

Example: Na-alginate, Fine gum, British gum, CMC.

5. Defoaming agents:

Functions:

To prevent the foam generation during printing.

Example: Silicone, Defoamers, Sulphated oil, Perminol KB, Emulsified pine oil.

6. Oxidizing agents:

Functions:

To develop the final color during steaming or in the subsequent after treatment.
Assists to dye fixation.

Example: Sodium chlorate, Potasium chlorate, Sodium nitrate, Resist salt, Ammonium chlorite, Ludigol, Na or K dichromate.

7. Reducing agents:

Functions:

Used for reduction of different dyes.
Used for mainly in discharge printing.
To destroy color from the ground of fabric.
To make the insoluble dyes to soluble.

Example: Sodium hydrosulphite, Stanus chloride etc. Rongolite-C.

8. Catalyst and oxygen carrier:

Functions:

To prevent fiber damage during steaming.
Accelerate the final color development by oxidation.
Reduce the risk of oxidation.

Example: Copper sulphide, Ammonium vanadate, Potassium ferrocyanide.

9. Acids/Alkalis:

Functions:

To maintain pH.
To develop the color or printed fabric.
To fix dye on the fabric permanently.

Example: Organic acid, Alkali KOH, NaOH, Na2CO3, Pottasium carbonate, Sodium bicarbonate, Sodium acetate.

10. Swelling agents:

Functions:

To create the big size holes of the fibers.
Helps to swell the fiber structure.
To reduce crystallinity.
Help the easy penetration of dye molecule inside the fiber polymer.

Example: Polyethylene glycol, Phenols, DEGDA (Di-ethylene glycol diacetate)

11. Carrier:

Functions:

Used for fixing disperse dyes on polyester or polyester wool blends at temperature below 105oC.

Example: Diphenol, Ortho-phenol, Tri-chloro benzene

12. Miscellaneous agent:

Functions:

Assist fixation of dyes.
Absorb moisture from air.
Facilitates subsequent washing off.

Example: Urea, Glycerine etc.

13. Mild oxidizing agent:

During steaming of ago color, the partial color can be destroyed by the effect of reducing. To secure of this condition, mild agent is used.

Example: Ludigol, Resist salt.

Related tag:

What are the ingredients used in printing paste?

What is the function of wetting agent in printing paste?

Why ammonia is used in printing paste?

What are the natural thickeners used in printing paste?

what is printing paste

printing paste preparation

preparation of printing paste pdf

pigment printing paste recipe

characteristics of printing paste

importance of printing paste

reactive printing paste recipe