Aluminum Windoor & Curtain Wall 2016: WACKER Presents New Silane-Terminated Polymers for High-Performance Adhesives
At Aluminum Windoor & Curtain Wall 2016, WACKER is unveiling novel, silane-terminated polymers for the formulation of adhesives and sealants. 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. Further product highlights are WACKER® GM neutral silicone sealant for safe and environmentally-friendly interior decoration as well as WACKER® SN, a class-zero mildew-fungus resistant sealant. Aluminum Windoor & Curtain Wall 2016 takes place in Guangzhou, China, from March 8 to 10.
GENIOSIL® XT 50 and GENIOSIL® XT 55 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. Adhesives and sealants 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 are repeatedly subject to dynamic forces, such as vibrations in vehicles and environmental temperature change in prefabricated houses. Products formulated with GENIOSIL® XT have a broader adhesion spectrum than polyurethane-based systems and do not contain any free isocyanates.
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 Environmentally-Friendly Adhesives
GENIOSIL® XT 50 is an alpha-silane-terminated polymer and lends itself to the production of tin-free, environmentally friendly adhesives for interior decoration purposes. Adhesives 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 for Low Modulus, High Elastic Sealants
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 low modulus, high elastic construction and industrial adhesives of the kind used, for example, in the assembling of prefabricated house and direct glazing of windshields in the automotive industry.
WACKER® GM Alkoxy Neutral Silicone Sealant
During Aluminum Windoor & Curtain Wall 2016, WACKER is also presenting two alkoxy neutral silicone sealants. These WACKER label cartridges possess excellent environmental features due to low VOC (Volatile Organic Compound) levels and zero methyl ethyl ketoxime, a possible human carcinogen.
WACKER® GM is a one-part, low modulus, alkoxy neutral silicone sealant with excellent sealing property due to good adhesion to most conventional substrates, such as glass, wood and tiles (compatibility test is needed for plastic materials). It has a long shelf life of 15 months. WACKER® GM is non-corrosive to metals and therefore can be used for adhesion and sealing for mirrors. The alkoxy neutral silicone sealant has low VOC (<1%) properties, is nearly odorless and lacks the smells traditional ketoxime sealants are known for. It is therefore especially suitable for odor-free interior decoration purposes.
WACKER® SN Mildew – Fungus Resistant Silicone Sealant
WACKER® SN is a one-part, high performance, alkoxy neutral silicone sealant with excellent mildew and fungus resistance. It complies with class-zero mould proof standard of GB/T 1741-2007, the most rigorous test of its kind in China. Thus, it is particularly suitable for joints of sanitary fittings and areas exposed to high humidity where protection from water and mildew damage is essential. As an alkoxy neutral sealant, WACKER® SN is odourless and is characterized by low VOC levels (<1%).
Visit WACKER at Aluminum Windoor & Curtain Wall 2016, Booth 6B02.
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