MUNICH/NUREMBERG, GERMANY: Wacker Chemie AG is unveiling several novelties for sealant and adhesive applications: The two new silane-terminated polymers GENIOSIL XM 20 and GENIOSIL XM 25 can be used as binders in adhesives and sealants, where they can modify the mechanical properties, in particular, impacting modulus.
This allows adhesives and sealants manufacturers to compound without the need of conventional plasticisers. In plasticizer-free adhesives, the new grades additionally enhance the bonding properties. In low-modulus sealants, they ensure high elastic recovery.
As a result, GENIOSIL XM opens up applications in the adhesives and sealants sector that had previously been inaccessible to silane-crosslinking polymers. For paper and packaging adhesives, Wacker is presenting VINNAPAS EP 400 E, a dispersion combining high performance with a low formaldehyde content.
The adhesive specialist: GENIOSIL XM 20
GENIOSIL XM 20 is an alpha-silane-terminated polyether. This grade opens the door to plasticizer-free adhesives with extremely high elasticity. At the same time, these possess high ultimate strength and also adhere well to difficult substrates. Furthermore, the product can extend skin over time. This provides the user with sufficient adhesive tooling time. Typical applications include wood flooring adhesives and all-around adhesive sealants.
The sealant specialist: GENIOSIL XM 25
GENIOSIL XM 25, a gamma-silane-terminated polyether, allows the formulation of low-modulus sealants with exceptionally high elastic recovery. Should sealant manufacturers use this grade as a co-binder, low-modulus construction sealants that exceed ISO 11600 specifications are possible. Potential applications include sealants for expansion joints in buildings made of industrially prefabricated concrete parts and for connection joints between window frames and walls.
For higher standards: VINNAPAS EP 400 E
Like many sectors, the paper and packaging industry, too, is making stricter demands on the environmental compatibility of the raw materials it uses. To meet these needs, WACKER has developed the dispersion VINNAPAS EP 400 E, which is characterised by an extremely low formaldehyde content (< 20 ppm).
It also has an impressive performance profile: the vinyl acetate-ethylene copolymer-based binder is not only fast setting but also shows a good balance between adhesion and cohesion. The dispersion is suitable for nozzle application at high speeds, and also has good machinability for roller application. The binder thus also satisfies continually rising productivity demands in paper processing. The new VINNAPAS EP 400 E dispersion is, therefore, ideal for formulating paper and packaging adhesives that combine high performance with improved environmental compatibility.
© Chemical Today News
Read More: Wacker presents silane-terminated polymers for sealants, adhesives
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