3 replies to this topic

[vashi saurabh]

We are using h3po4 in polymer.This h3p04 works as a thermal stabilizer at high temp.This h3po4 is in the pure form and doesn't have any other component in it.Recently what happen that we have changed our h3po4 vendor and start to purchase h3po4 from some other vendor.The problem started here.The vendot doesn't tell us that this H3po4 contians 2% of acetic acid in it.When we inject this h3po4 then the color of polymer drastically changed.Upto 4- 5 days we couldn't find out the problem.then sombody suggested to do the anylysis all the additives we are adding in polymer.Then we came to know this problem.after adding h3p04 (which doen't have any acetic acid) color became normal in 3-4 hrs.

So i want to know what is the effect of Acetic acid on polymer.???(Our process temperature is 2900c.)
and what is the reaction of this acetic acid with polymer cauing color to detoriate???

if anybody have any idea then please give us the comment

[Mehrdad]

vashi

it is pretty clear that you have a new compound and new compound have a new color !

[Mehrdad]

vashi

in organic polymers the color is product of absorbtion of double bond resonance cycle in range of visible light frequency.if you change this cycle, the absorbtion frequency will chang and then you see a different color.
now i guess the impurity like acetate make an anionic attack in polymer chain and a new resonance cycle forms in polymer with a new absorbtion frequency, then you see the color of an acetat-polymer resonance cycle ,when you use a phospheric acid with acetic acid impurity.

regard

[Mehrdad]

vashi

such a good detail.
i have not a clear idea but you can order a full instrumental qualitative analysis for recognize of problem.

regard