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Environmental fate & pathways

Hydrolysis

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Feldhues, 2007 + 2004
In a screening test at 50 °C the HDI Trimer was found to hydrolyse by 84 – 89 % within less than 1 hour at pH values of 4, 7, and 9. Approximate mean half lives of 3 hours were estimated at any pH and environmental relevant temperatures. A hydroysis product based on the hydrolysis of the 3 Isocyanate groups to the corresponding amine functions has been postulated as a theoritcal hydrolysis product which was however notanalytically found.
Meissner, 1999:
Regarding disappearance of Isocyanate groups, the half-life (DT50) of HDI Trimer in an acetonitrile/water solution is approx. 7.7 hours at room temperature (23 °C).

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