Chemistry of Phenalkamine curing agents
The unique chemistry of Cardanol differntiate Phenalkamine from traditional curing agents.
Phenalkamine curing agents are synthesized from cardonol reacted with formaldehyde and alkylamines via the Mannich reaction. The aromatic backbone of phenalkamine is responsible for the rigidity of the epoxy resin network and chemical resistance whereas the aliphatic side chain gives it flexibility, low viscosity, long pot life, corrosion protection and water resistance when used as a hardener for curing the epoxy resin. The phenolic hydroxyl group makes it very active even at low temperatures, good adhesion on moist surface and fast curing characteristics. The phenalkamine side chain is responsible for the high cross-linked density.