Fatty amine curing agents, such as ethylenediamine, hexamethylenediamine, diethylenetriamine and triethylenetetramine, are commonly used two-component curing agents for epoxy resin at room temperature. Through chemical modification, they have nucleophilic addition reaction with organic ketones, and dehydration is an effective method to block, reduce their curing activity and improve their storage stability.
This one-component system consisting of ketoimine curing agent and epoxy resin decomposes ketoimine into amine under the action of moisture and moisture, so the epoxy resin can be cured at room temperature. However, the curing speed is generally not fast and the service life is short, because the lone pair on the imine nitrogen atom still has certain ring-opening activity. In order to solve this problem, ketoimine obtained by methylcyclohexane reaction of ketone 3- methyl -2- butanone with sterically hindered groups at both ends of carbonyl group and diamine 1 3 with high activity not only has high curing reaction activity, but also has obviously improved storage stability. In addition, it is reported in Japanese patent that ketoimine obtained by the reaction of polyether modified aliphatic amine compound with methyl isobutyl ketone is also a potential curing agent for epoxy resin with good properties. Fatty amine curing agents can also reduce their curing reactivity by reacting with acrylonitrile, organic phosphine compounds and transition metal complexes, thus having certain potential properties.