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WAC 2012 - Wacker to Present Hybrid Polymers for Structural Adhesive Bonds and much more

Published on 2012-07-27. Author : SpecialChem

Munich -- Wacker, the Munich-based chemical company, will present first-ever hybrid polymers for structural adhesive bonds at the World Adhesive & Sealant Conference WAC2012. The novel polymers are based on the alpha-silane technology and are available as grades of the new GENIOSIL® XB product line. They cure on contact with atmospheric moisture to form thermosets, thus achieving the high Shore-D strength needed for structural adhesives. This provides adhesives manufacturers with an alternative to traditional binder materials. Adhesive binders based on GENIOSIL® XB pose no health risks, meet high technical requirements and offer manufacturers a wide range of formulation options. WAC2012 takes place in Paris from September 18 to 21.

Evaluation of the lap shear strength of a wood-aluminum bond. The adhesive used was formulated with Wacker’s novel binder GENIOSIL® XB. These innovative hybrid polymers enable the formulation of high-strength structural adhesives. Such adhesives are free of isocyanates and solvents and offer excellent primerless adhesion to wood, glass, metals and ceramics.

The GENIOSIL® XB product line is a range of alpha-silane-terminated polyethers. The polymers are of low viscosity and feature a high density of crosslinkable silyl groups. This high silyl group density produces a close-meshed three-dimensional network on curing. Depending on the formulation, hardnesses are in the high Shore-D range - levels never before achieved with silane-terminated polyethers.

Their low viscosity makes the new hybrid polymers easy to handle and process. In particular, they can be formulated without using plasticizers or solvents. Tin catalysts can now also be dispensed with - yet another advantage of using alpha-silane technology. Tin-free formulations eliminate incompatibilities with ester-based additives, thereby widening the formulation scope and enhancing the shelf life of the adhesive.

Wacker’s new binder technology GENIOSIL® XB allows the formulation of versatile and high performance structural adhesives. They adhere to many materials and material combinations such as wood-wood, wood-aluminum, aluminum-aluminum, aluminum-concrete and aluminum-ceramic (see picture, from left to right) with no need for primers.

Adhesives formulators can modify the mechanical end properties and the adhesive strength in the formulation for precise adjustment in line with requirements. In terms of adhesive strength and flexibility, the cured adhesives are making advances into what used to be the exclusive domain of epoxy-based, isocyanate-curing systems. Depending on the substrate, adhesives formulated using GENIOSIL® XB can attain adhesive strengths of up to 15 N/mm2. For instance, a glue dot one centimeter in diameter between two beech panels is able to carry loads of up to 120 kg. GENIOSIL® XB is also suited for making waterproof wood adhesives that satisfy durability classes D1 through D4 (DIN EN 204).

The new binder technology makes structural adhesives especially easy to use. They cure without bubbling and gain strength quickly; they adhere to many commonly used materials such as wood, glass, metals and ceramics with no need for primers. Adhesives based on GENIOSIL® XB can be applied and processed just like conventional polyurethane-based products.

About Wacker

Wacker is a globally active chemical company with some 17,200 employees and annual sales of around €4.91 billion (2011). Wacker has a global network of 24 production sites, 19 technical competence centers and 53 sales offices.

Source: Wacker

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