Epoxy Curing Agent ECA 29 is a mixture of aliphatic polyamines derived from ethylenediamine and has an AHEW (amine-hydrogen equivalent weight) in the range of 36-38. Consisting of higher oligomers of TETA (triethylenetetramine), Epoxy Curing Agent ECA 29 amine may be particularly useful as an epoxy curing agent in applications where higher Tg (glass transition temperature) and reasonably fast reactivity are needed with longer pot-life than DETA or TETA hardeners. As illustrated by the following figure, the increasingly fast gel times with standard bisphenol A based epoxies of the ethyleneamine series EDA (AHEW = 15.03), DETA (AHEW = 20.6), and TETA (AHEW = 24.4) are attributable to their increasing functionality and to them being aliphatic amines. For these three amines, the gel times shorten through the series, even though their AHEWs are increasing, which decreases the concentration of reactants in stoichiometric mixtures. As might be expected, the amines with higher AHEW, and therefore lower amine group concentrations in the formulations, have somewhat lower maximum exotherm temperatures. Epoxy Curing Agent ECA 29 amine follows this trend of having a slightly lower exotherm temperature, however it provides a longer working time until gelation than do the lower functionality amines DETA or TETA. This is attributed to the higher proportion of secondary amino groups in this product. The high functionality of this amine also increases the level of crosslinking in the fully cured epoxy, resulting in a relatively high Tg of 143°C.
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