| abstract |
Provided herein are polyamine precursors useful for use in the production of epoxy resins. The use of the polyamine precursor according to the present invention results in an epoxy resin formulation having a longer working time compared to prior art amines used in epoxy curing. The long working time is interpreted to enable the production of composites that cannot be produced using conventional epoxy curing agents, such as composite blades for wind turbines. The polyamine is useful because it increases the reaction time even when blended with polyurea, so that the amount of the polyurea flowing until the polyurea coating is gelled increases. |