One-Pack Epoxy Foaming with CO2 as Latent Blowing Agent

In this work, we have successfully developed a novel approach to epoxy foaming using CO₂ as the latent blowing agent. The active amine groups of a commercially available curing agent for epoxy resin are blocked by CO₂ to obtain ammonium carbamate. The prepared ammonium carbamate can be decomposed by heating. Above 100 °C, CO₂ is released from the amine groups and acts as the blowing agent, while the amine compound is used as the curing agent …