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Wacker at ECS’15: Unveiled Silane-terminated Polymers for Formulation of Adhesives

Published on 2015-04-30. Author : SpecialChem

Munich -- At the European Coatings Show 2015, held in Nuremberg, Germany, Munich-based chemical group WACKER unveiled 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. This combination of properties unlocks applications in automotive and mechanical engineering that were previously closed to silane-curing polymers. The new VINNAPAS® EF 8860 dispersion is another highlight. Based on vinyl acetate-ethylene copolymers (VAE), the binder is ideal for flooring adhesives for bonding flexible floor coverings, such as carpets, PVC and linoleum.

Determination of adhesion via peel test: Adhesives formulated with VINNAPAS® EF 8860 are particularly rugged and long-lasting. This makes the new product an ideal dispersion base for flooring adhesives for flexible floor coverings such, especially for PVC floorings.

GENIOSIL® XT 50 and GENIOSIL® XT 55 further complement WACKER’s portfolio of silane-curing binders. Both grades are based on a silane-modified polyether 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.

GENIOSIL® XT 50 for Liquid Waterproofing Systems
GENIOSIL® XT 50 is an alpha-silane-terminated polymer and lends itself to the production of tin-free adhesives and crack-bridging liquid waterproofing systems. These can possess tensile strengths of up to 9 N/mm2 and tear strengths of up to 50 N/mm (measured in accordance with ASTM D 624 B-91). What is more, GENIOSIL® XT 50 can be formulated without fillers to make transparent, tin-free end products that have good mechanical properties.

GENIOSIL® XT 55 is a gamma-silane-terminated polyether. It can yield shear strengths of over 5 N/mm2 combined with elongation at break of around 700 percent, the exact values depending on the formulation. Such formulations are also notable for their high tear strength and high elastic recovery. The polymer is therefore ideal for the production of high strength, yet extremely flexible industrial adhesives of the kind used, for example, in direct glazing of windshields in the automotive industry.

Reliable Adhesion for Flexible Floor Coverings
At the ECS 2015, WACKER premiered VINNAPAS® EF 8860, an aqueous polymer dispersion based on the monomers vinyl acetate and ethylene, for flooring-adhesive applications. The new product is an ideal dispersion base for flooring adhesives for flexible floor coverings. Adhesives formulated with VINNAPAS® EF 8860 have excellent cohesion, but also good adhesion to the floor coverings to be bonded. Furthermore, the dispersion is highly resistant to the plasticizers usually employed in PVC coverings and so creates bonds that are particularly rugged and long-lasting. VINNAPAS® EF 8860 is thus perfect for formulating adhesives for flexible floor coverings, especially carpets, PVC and linoleum.

WACKER is one of the globally active chemical companies based in Munich. The Group's portfolio focuses on semiconductor technology, silicone chemistry, polymer chemistry, specialty chemicals and biotechnology, as well as polysilicon. WACKER has 15,600 employees at 22 production sites in Europe, America and Asia, as well as 100 sales offices worldwide. WACKER is 51-percent owned by Dr. Alexander Wacker Familiengesellschaft mbH, Munich and 49-percent owned by Aventis S.A., Strasbourg, France.

Source: WACKER

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