polyurée

Polyurea is a type of elastomer that is formed by the reaction of an isocyanate component with a hybrid mixture of a chain extender and a synthetic amine. This reaction creates a polymer with exceptional strength and durability. Polyurea coatings are known for their rapid curing times, often hardening within seconds or minutes, which makes them suitable for applications where fast return to service is critical.

The properties of polyurea can be significantly modified by adjusting the type and ratio of the isocyanate and amine components. This versatility allows for a wide range of formulations, from very rigid and brittle to highly flexible and tough. Common applications include protective coatings for concrete and steel in structures such as bridges, parking decks, and secondary containment systems, as well as linings for truck beds and tanks.

Key advantages of polyurea include its excellent resistance to abrasion, impact, chemicals, and moisture. It also exhibits good adhesion to various substrates and can be applied in a wide range of temperatures. However, the application of polyurea often requires specialized equipment and trained applicators due to the reactive nature of the materials and the need for precise mixing and application. Environmental factors, such as humidity, can also influence the curing process and the final properties of the coating.