Press Releases - Wacker Chemie AG


Press Releases

WACKER Presents Toluene-free Primer for Silicone Composites

Munich, Oct 19, 2016

WACKER, the Munich-based chemical company, is showcasing a new adhesion promoter for silicone rubber at K 2016, the 20th International Trade Fair for Plastics and Rubber. WACKER® Primer G 790 toluene free is used to achieve reliable adhesion between addition-curing silicone rubbers and hard substrates such as aluminum, stainless steel or glass. In comparison with many conventional adhesion promoters, the primer contains no toluene or other aromatic compounds. K 2016 takes place in Düsseldorf, Germany, from October 19 to 26, 2016.

Haftvermittler
At the International Trade Fair for Plastics and Rubber WACKER, the Munich-based chemical company, is showcasing for the first time the toluene-free adhesion promoter WACKER® Primer G 790 TF. Tensile tests show that the primer substanti-ally improves the adhesion of liquid silicones to metal, glass or plastic surfaces. The adhesive strength is so good that the bond is permanent.

The adhesion promoter WACKER® Primer G 790 has proven indispensable in many industrial sectors and applications for the pretreatment of metallic and hard non-metallic substrates. It helps to achieve a strong and permanent adhesive bond to liquid silicone rubbers and other addition-curing silicone rubber compounds.

At K 2016, WACKER is launching a further development of the tried and tested adhesion promoter. WACKER® Primer G 790 toluene free has the same adhesion-promoting effect as its predecessor. It is also suitable for pretreating hard substrates such as aluminum, stainless steel, glass, epoxy resin and glass-fiber-reinforced plastic. However, the product differs in terms of the solvent composition. It contains no toluene or other aromatic compounds.

WACKER® Primer G 790 toluene free – a low-viscosity, yellowish solution – contains reactive silicone resins and organic silicates as adhesion-promoting active substances. A mixture of aliphatic hydrocarbons is used as a solvent. The solution is applied in extremely thin layers in a spraying or dipping process, or by brush on to the thoroughly cleaned substrates. Once the solvent has evaporated, the active substances crosslink under exposure to atmospheric moisture and form a silicone resin film that is chemically bonded to the substrate. A silicone rubber compound applied thereafter anchors itself to the film during its curing, resulting in a durable and stable metal-, glass- or plastic-silicone bond.

The possibility of forming a stable bond is essential when manufacturing two-component products. The substrate primed with the adhesion promoter can be used as the hard component in hard/soft combinations. It can therefore be inserted in the molding tool of an injection-molding machine, for example, and overmolded with a liquid silicone rubber. A sufficiently strong bond between the silicone and the hard component can only be established after applying a prime coat.

Visit WACKER at K 2016 in Hall 6, Booth A10.

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Wacker Chemie AG
Media Relations & Information
Florian Degenhart

Tel. +49 89 6279-1601
Email florian.degenhart@wacker.com
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