Dyeing of PC blended Fabric with Disperse Dye to Produce Resist Effect

Last updated on July 17th, 2023 at 10:47 pm

Blended fabric is a collection of many artists work mixture of styles and a celebration of talent. Blends are any textile materials from fibres through yarn to fabric which are deliberate combinations of chemically or physically fibrous polymer. Under this definition, blends can range from bi-component fibres, mixture of different filament core spun yarn, uniformly blended staple fibre throughout fabric and everything which falls between.

Resist or Reserve Dyeing with Blends

At least one of the components of the blend remains essentially un-dyed i.e. almost white. Example: milens fabric, here in resists dyeing – cotton part remain un-dyed.

Fibre and Fabric

Fibre: Cotton and Polyester

Fabric: Knitted

Dyes

Any class of disperse dye. Slightly water soluble. They are made soluble with the help of some dispersing agent. Colorfastness of this dye is excellent. It gives a variety of shade.

Instruments and Glass Wares

• Beaker
• Glass rod
• Measuring rod
• Bowl
• Electronic balance
• Scissor
• Sample dyeing machine
• Pipette
• Conical flask etc.

Dyeing of Polyester Part

Recipe

• Disperse red: 2%
• Dispersing agent: 1g/l
• Acetic acid: 1g/l
• Sample: 1 : 20
• Total liquor: 100
• P^H: 4.0 to 4.5

Chemicals and auxiliaries

• Acid
• Dispersing agent
• Leveling agent
• Buffer solution

Necessary Calculation

We know required dye in CC = (Sample wt. X shade %)/( Stock solution %)

Disperse red: 1% stock solution = (5 X 2%)/1% = 10CC

Required chemical in CC = (gm/l X Total liquor)/(stock solution%)

Dispersing agent: 1% stock solution = (1 X 100 X 100)/1000 = 10CC

Procedure

Dye bath is set at 50-60⁰C with buffering solution for maintaining P^H 4 – 4.5. dispersing agents are applied in two stages. First half with dye solution. Rest half in the dye bath with fabric. Then the temperature is raised to 85 – 95% by 3 gradients. P^H is checked here if there is any fluctuation then it is adjusted by buffer solution. Now raise the temperature to 130⁰C by 1.5 – 2 ⁰C/min. Keep the entire bath running at 130⁰C for 30 – 60 minute depending upon the required depth of shade. Temperature is down by cooling 80⁰C.

Neutralization

Recipe

Acetic acid: 1gm/l

Calculation

Acid: 1% stock solution = (1 X 100 X 100)/(1000 X 1) = 10CC

Water required = (1000 – 10)CC = 90CC

Procedure

Neutralization is done to remove alkali from the fabric. 1gm/l acetic acid is used. Then treat the sample at 40⁰C for 10 minutes.

Precautions

• Stock solution should be prepared carefully.
• Time and temperature should be properly maintained.
• Neutralization should be done properly.