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WACKER® PRIMER G 791 A/B

WACKER® PRIMER G 791 A/B is a two-component, addition-curing primering system diluted in an organic solvent. The primer is applied to the substrate and after curing forms a primer film which firmly adheres to the substrate. Application of a silicone rubber onto the primed substrate and subsequent vulcanization will then result in a tight bond between the silicone rubber and the substrate.



特性

  • silicone on silicone curing
     

WACKER® PRIMER G 791 A/B的特殊性能

  • 增粘底涂

免责声明

所提供之所有信息均基于我们当前所掌握的知识。尽管如此,我们不对其作任何担保、也不承担任何责任,并且保留在任何时候进行技术变更的权利。购买方应在预测试中对所提供之信息以及产品在既定应用中的适应性进行检查。任何时候都必须以合同条款与条件为准。此外,本免责申明还适用于与第三方权利有关之事宜,尤其是在德国境外。

Bonding agent preferably used for bonding addition-curing silicone rubbers onto vulcanized, addition-curing rubbers (e.g. WACKER® ELASTOSIL® RTV-2, LSR and R plus or WACKER® POWERSIL® RTV-2 and LSR). WACKER® PRIMER G 791 A/B is especially suited for bonding addition-curing POWERSIL® XLR® 630/640 onto vulcanized silicone rubber of the same grade.

Surfaces to be primed have to be dry and free from grease, oil, wax, dust, rust or other contaminants. Also mold-release agent from the previous vulcanization cycle on the silicone rubber substrate has to be removed.
The surface should be cleaned, e.g. with a non-polar solvent such as mineral spirits (boiling range between 80 °C and 140 °C), followed by a polar solvent, such as acetone. Very smooth surfaces may be roughened by grinding until the shine of the surface disappears. Loose particles must be removed.

Components A and B must be homogenized before use. A and B are mixed in a ratio of 1:1 by weight. The pot life of the catalyzed primer mixture is 2 – 3 days at room temperature and can be prolonged by cooling to approx. 1 week at 6 °C. Storage must be in properly sealed containers.

Wacker Primer G 791 A/B [1.0] is applied in a thin film layer with a brush, by dipping or spraying. The primer film has to be vulcanized for 20 – 60 minutes at 100 – 120 °C.

The silicone rubber should be applied to the primed surface soon after the heating process, if possible. It is recommended that this is done not later than approximately 2 days after priming the substrate. Otherwise a drop in adhesive strength may occur. Prior to the application of the silicone rubber, the primed surface has to be kept free of contaminations.

Important
Initial adhesion directly after vulcanization of the rubber will in many cases be high already. In some cases, however, initial adhesion will be sufficient for handling the composite while maximum adhesive strength will only be achieved after about 4 days. Additional post curing of the cured rubber at 70 °C – 150 °C will further improve adhesion. Once opened, containers of ???000009630??? should be kept well sealed and stored in a cool and dry place.

For detailed information, refer to brochures on www.wacker.com.

储存

The 'Best use before end' date of each batch is shown on the product label.

Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

销售和支持

Wacker Chemicals (China) Co.,Ltd.
Caohejing Hi-Tech Park
200233 Shanghai
中国大陆
+86  21  6130-2000 (电话)
+86 21 6130-2500  (传真)
Contact Sales
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