Hardeners, also known as curing agents or crosslinkers, are essential chemical substances that promote polymerization and cross-linking reactions in coatings, transforming them from liquid or paste into durable solid films with enhanced mechanical, thermal, and chemical properties.
Polyurethane curing agents typically contain isocyanate groups (NCO) that react with active hydrogen components such as polyether polyols or polyester polyols to form a durable, crosslinked polyurethane network. These agents are essential for increasing the hardness of polyurethane coatings through cross-linking reactions.
Epoxy curing agents are used to increase the hardness of epoxy coatings by encouraging cross-linking reactions. These hardeners create three-dimensional network structures that provide exceptional mechanical properties and chemical resistance.
Blocked isocyanates serve as latent crosslinking agents or adhesion promoters in industrial coating processes that involve a heat curing cycle. They allow for stable one-pack systems that remain inactive at room temperature but cure when heated.
Stable storage without premature curing
Controlled curing at elevated temperatures
Reduced isocyanate exposure during application
Machinery, equipment, and metal structures requiring high durability
Clear coats, primers, and high-performance finishes
Chemical-resistant and anti-corrosion applications