3. Construction of adhesive

The bonding surface of metal parts with qualified surface treatment can be applied by brushing, spraying, roller coating, knife scraping, dipping, etc. The method used can be determined according to the size of the piece and the characteristics of the adhesive.

Metal parts with qualified adhesive surface treatment

 

4. Gluing and vulcanization, there are two methods: hot sticking and cold sticking. After gluing, it can be compacted mechanically or by pressing. The film should not be too thick, and thin films should be pasted layer by layer to the required thickness. Generally, the thickness of hard film is 0.1 to 1.5 mm, and the thickness of soft film does not exceed 4 to 5 mm to avoid bubbles in the film. Vulcanization bonding can be divided into two types: hot vulcanization and cold vulcanization. Thermal vulcanization bonding is to put the metal parts with the film on them under a certain pressure and temperature to complete the bonding between the rubber and the metal. Cold vulcanization bonding uses an adhesive to vulcanize naturally under room temperature conditions by applying pressure for a certain period of time to bond the vulcanized rubber to the metal. Pressurization is an indispensable condition for the bonding process. The pressure and temperature depend on the product and its formula.

In summary, to achieve the bonding of silicone rubber and metal, four steps must be followed: metal surface, joints, adhesives, and bonding methods. However, silicone product manufacturers should pay attention to the following points when implementing it, such as chemical If the metal surface treated by this method is not treated in time, it will be polluted by dust, temperature, etc., and oxidized and rusted. In addition, when applying the adhesive, it is required to be uniform and have a certain amount of glue attached. The environment during glue application The temperature should be controlled at 15~35℃, and the relative humidity should be below 70% to completely evaporate the solvent and avoid dew on the surface.