Times are hard, trying to make them harder (looking for catayst suggestions)


Here is the situation, base cataysted polyurathane system. Tempature
is a major pain since every customer wants their open time within a
certain window and will not accept that if you lower catayst during the
summer you may not get the same strength levels that you get in the
winter with higher catayst loads. These systems are heavy in filler
and so the end strength is very dependant on how much catayst in
present. I am interested in buffering the catayst in the hopes that I
can find a polyprotic weak acid that will dissocate and deactivate the
base, but then have the equlibrum move based on tempature.

So excess base(with one active site) in the presence of a polyprotic
weak acid. Enough base is added to strip the first proton off the
acid, but will the excess always strip the next one? I assume that
given a high enough energy of deprotonation on the second proton that
it will reach an equlibrum favoring the excess base. And yes, I know
that I need to find the Ka and Kb of my products and reactants. I am
looking for ideas of polyprotic weak acids with relatively high
energies of deprotionation. Or a pointer to anyone having done
something similar.

Any help appreciated

Ghostwriter

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