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A blocked isocyanate crosslinker is a molecule where an isocyanate group, which is highly reactive, has been temporarily “blocked” by a blocking agent. This blocking agent makes the isocyanate stable and non-reactive at room temperature, but it can be released upon heating, allowing the isocyanate to react and crosslink with other molecules. The blocking agent prevents premature reaction of the isocyanate groups during storage. The release of the blocking agent at a specific temperature allows for precise control of the curing process.
Isocyanate Monomers
Blocked Isocyanate
Aliphatic Isocyanate
Hexamethylene Diisocyanate
Crosslinker of Polyurethane Resin
Crosslinking with blocked isocyanates can lead to improved durability, adhesion, chemical resistance, and other desirable properties in the final product.
Blocked HDI isocyanates are used in formulation of stoving coatings for coil and metal cans industry. It is used as a hardener of polyester and acrylic resins with excellent corrosion resistance and superior outdoor durability. Blocked isocyanates are used in both solvent-based and water-based coatings to improve their durability, adhesion, and chemical resistance.
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