High reactivity to impart strenght and resistance
Our Crosslinkers lean on Isocyanate chemistry.
These organic groups are highly reactive. Thanks to their accumulative double bonds, they form urethane and urea linkages in the coatings, through a fast and exothermic reaction with components having active hydrogen atoms, such as alcohols, water, amines and carboxylic acids.
Isocyanate can successively react with urethane and urea linkages leading to a branched allophanate and biuret network, that further increases the coating strength and its resistance to mechanical and chemical strain.
No catalysts are required for these reactions to occur.
Free and Blocked Isocyanate Crosslinkers
At Lamberti we produce Free Isocyanate Crosslinkers. These organic solutions of polyisocyanates are characterized by low viscosity and good compatibility with formulation co-components, which make them easy to use. They are appreciated for their good balance between pot life and reactivity.
We produce Blocked Isocyanate Crosslinkers in aqueous dispersions that meet the crosslinking need in formulations, where organic solvents are likely to be avoided. To protect them against reaction with water, isocyanate groups are reversibly linked to an organic component that is removed through heating, which allows a perfect control of crosslinking kinetics on the coatings.