Sunday, 2 August 2009

How to Resist Print using Reactive Dyes



How to resist print using reactive Colors

In resist printing using reactive colors, non-carbonic acids such as Tartaric Acids or Citric acid can be used.These acids act as resist agents. As acids are used therefore such a thickner is selected that does not degrade in acid. Here Methylhydroxy-ethylated cellulose ethers are used.
The following resist paste formula is used to print on the fabric:

For White Resist

Citric Acid- 50 gms
Water- 50 gms
Thickener- 600 gms.
To recognise the the printed design, sometimes tints such as CI Acid Blue-1 can be used. Also Fluorescent Brightening Agent can also be used which is visible in UV light.

After printing, the substrate is padded with concentrated solution of reactive colors, containing very less amount of Sodium Bicarbonate.The color is fixed after drying the cloth.

The following formule is used to:

1. Pad the cloth:

Reactive color: 20 gms
Resist Salt: 7 gms
Hot Water: 393 gms

Mix the three, let the solution to cool and then add the following chemicals:

3% Sodium Bicarbonate: 500 gms
Thickner: 80 gms
Make it to 1 kg.

2. Fixation Solution:

Caustic Soda -32.5%: 20ml
Glauber's Salt : 200 gms
Common salt: 100 gms

Make it to 1 liter.
Now steam the fabric for 20 seconds after padding with fixation solution.

For Color Resist

Thickner (Cellulose Ether): 100 gms
Emulsifier: 8 gmsWater: 110 gms
Pigment Binder:140 gms
White Spirit: 617 gms
Phosphoric or if Roller printing then Tartaric Acid: 120 gms

Print the fabric with the formula as given above. Then pad with reactive colors and Dry. Then Steam the cloth for 2-10 minutes, rinse and dry.

Disclaimer: Please test on a small piece before going for full fledge project. The receipe is meant to be used by professionals who know the behaviour of various chemicals and their interactions. Take all the precautions in handling chemicals. Don't use any combination of chemicals about which you don't know the outcome.

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