Thixotropic two-component polyurethane systems

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/65 (2006.01) C08G 18/10 (2006.01) C08G 18/32 (2006.01) C08G 18/38 (2006.01) C09D 5/04 (2006.01)

Patent

CA 2295548

The invention relates to two-component polyurethane systems, consisting of one polyol component and one isocyanate component. Said polyol component contains at least two amines A1 and A2, the reactivity R1 of amine A1 with isocyanate being considerably greater than the reactivity R2 of amine A2 with isocyanate. As a result, two time-delayed reactions take place. This gives the inventive systems the desired low level of viscosity, and the thixotropic properties which prevent even thick layers from sliding off of vertical surfaces. The inventive two-component polyurethane systems can be used for producing cubing models, master models and similar in the automobile industry and for producing structured bodies and thick films and sealing beads.

L'invention concerne des systèmes de polyuréthanne à deux constituants thixotropes contenant un constituant polyol et un constituant isocyanate. Le constituant polyol contient au moins deux amines A1 et A2, la réactivité R1 de l'amine 1 par rapport à l'isocyanate étant largement supérieure à la réactivité R2 de l'amine 2 par rapport à l'isocyanate. Il se produit ainsi deux réactions décalées dans le temps, conférant aux systèmes décrits une faible viscosité souhaitée pour l'application et une thixotropie après l'application, qui permet d'empêcher le glissement même de couches épaisses sur des surfaces verticales. Ces systèmes de polyuréthanne à deux constituants sont utilisés pour la production de modèles d'estimation, de prototypes ou similaires dans l'industrie automobile, et pour la production de corps structurés, de revêtements épais et de cordons d'étanchéité.

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