Silicone rubber and metal bonding process

With the continuous innovation and progress of silicone industry technology, the application of silicone rubber in life is also more and more widely, but sometimes in the application will encounter some problems, such as how to silicone rubber products can be bonded with metal

First, metal surface treatment, to achieve bonding, first of all to treat the metal surface, the commonly used method is: chemical, mechanical and solvent three, the general silicone products factory is based on the actual selection of methods, mechanical treatment often using sandblasting, emery cloth or grinding wheel grinding and other methods, especially sandblasting method, low cost, fast speed, good effect, widely used. Chemical treatment is also more commonly used, especially the anodization of aluminum and its alloys, and the copper plating of steel, which requires chemical method. After the treatment of the metal surface, the treated surface should be promptly coated with adhesive, affixed with silicone rubber or immersed in an inert solvent.

Second, the design of metal joints (recommended products: fluorine rubber joints), to achieve the bonding of silicone rubber and metal, followed by the bonding of the joint, because part of the overall design of the product, the following first understand the design principle of the joint:

Fluororubber joint

1) Increase the adhesive area as much as possible to improve the bearing capacity of the adhesive joint;
2) The stress mode of the bonded joint should be shear or tensile force to prevent peeling force;
3) The bonding length in the force direction should not be too long, and the bonding width should be increased as much as possible;
4) The force direction of laminated bonding should avoid separation between layers;
5) Angle bonding is better than right Angle bonding;
6) The joint with transverse stress should be bonded with die surface. According to the above principles and the characteristics of rubber products, methods such as drilling and threading grooves are generally used in metal parts to improve the bonding strength of joints.