Silane-Terminated Polymers for High-Performance Adhesives
At the European Coatings Show 2015, Wacker Chemie AG, Munich, Germany, will introduce novel, silane-terminated polymers for the formulation of industrial adhesives and for sealing flat surfaces. Known as Geniosil XT, the new binder makes it possible to produce materials that are extremely tear-resistant and at the same time highly elastic.
Geniosil XT 50 and Geniosil XT 55 further complement Wacker’s portfolio of silane-curing binders. Both grades are based on silane-modified polyethers with a high density of crosslinkable silyl groups which cure to a tight-mesh network that is very strong but elastic. Adhesive layers and sealing membranes formulated with Geniosil XT possess high strength. However, they are also highly ductile and will tear only when subjected to strong forces. Damaged material exhibits no tendency to tear propagation.
Geniosil XT thus represents the first technically equivalent alternative to conventional polyurethane-based systems. By virtue of their properties, the new polymers are ideal for applications that repeatedly subject them to dynamic forces, such as vibrations in vehicles and washing machines. Up to now, applications of this kind were essentially the domain of isocyanate-curing polymer systems.
Furthermore, Geniosil XT’s low viscosity makes it easy to process at low temperatures. The binders can be formulated with and without plasticizers or fillers, and blends can be produced in any color. The compounds can be formulated for adhesion to many conventional substrates, such as metals, glass, cement, glazed tiles, wood, polycarbonate, and polymethyl methacrylate. Priming is unnecessary. As the polymers are also miscible with all other Geniosil silane-terminated polyethers, compounders can vary the properties over a wide range of formulations. Typical end products are industrial adhesives, liquid waterproofing systems, and coatings.
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