Amine-based epoxy curing agents
Sunmide® curing agents are a well-known brand in Asia. The Sunmide brand name encompasses almost all types of amine-based epoxy curing agents including polyamides, amidoamines, aliphatic amines, cycloaliphatic amines, and phenalkamines. The Sunmide brand also includes modified versions e.g. adducts of the base chemistries for improved performance.
Phenalkamines are a special group of Mannich bases. Mannich bases are the reaction products of formaldehyde, amines, and a carbon acid. In the case of phenalkamines, the acid is cardanol. Phenalkamines are known for their fast cure at low temperatures as well as strong adhesion to metal surfaces. Phenalkamines are most often used in marine primer applications.