When we dye polyester with disperse dye there is the requirement of maintaining constant acidic ph of fabric. Just using acetic acid at 150-200 degree centigrade cannot withstand and maintain constant ph for this we need to introduce buffer system into it.
Kindly suggest what ingredients should I use to make buffer for this system.
Can I use Acid and different salt for example acetic acid and sodium citrate? Can it be used as buffer?
You can use sodium hexametaphosphate (Na6P6O18 ) as a buffer additive to acetic acid.
The buffer system depends on the pH to be achieved. In case of slightly acidic media I would suggest acetic acid/acetate buffer (pH 3.7 - pH 5.7). The ratio can be calculated by application of the Henderson-Hasselbalch-equation.
Best regards.
Helga
Thanks but acetate buffer is not desirable in this case. The buffer which could be maintained up to 200 degree centigrade.
Use one of the two mixtures
1. Acetic acid and sodium acetate
2. Formic acid and sodium formate
No needs for buffer as the dyeing is carrying out in the closed chamber at high temperature.
No needs for buffer as the dyeing is carrying out in the closed chamber at high temperature.
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