With the continuous innovation and progress of silica gel industry technology, the application of silicon rubber products in life is more and more widely, but sometimes in the application of some problems, such as how can silicon rubber and metal bonding, the following share four steps to achieve the bonding of silicon rubber and metal:

One, metal surface treatment

To achieve adhesion, first of all to the metal surface processing, the commonly used method is: chemical, mechanical, and three kinds of solvent, silicone products factory is chosen according to the actual method commonly, sandblasting machine processing method often USES, use sand cloth or emery wheel grinding, especially sand blasting method, low cost, fast speed, the effect is good, for a wide range of applications. Chemical treatment is also commonly used, especially the anodization of aluminum and its alloy, and copper plating of steel. After the treatment of the metal surface, the surface should be timely coated with adhesive, affixed with silicone rubber or immersed in inert solvent.

Two, metal joint design

In order to realize the bonding of silicon rubber and metal, the next step is to start from the bonding joint, because it is part of the overall design of rubber products, the following first understand the design principle of the joint.

1) Try to increase the bonding area to improve the bearing capacity of the bonded joint;

2) The force mode of the bonded joint should be shear force or tensile force to prevent peeling force;

3) In the direction of the force of the bonding length should not be too long, should try to increase the bonding width;

4) The force direction of laminate bonding should avoid separation between layers;

5) Bevel Angle bonding is better than right Angle bonding;

6) The joint under transverse force shall be bonded with the die surface.

According to the above principles and the characteristics of rubber products, drilling holes in metal parts, grooving screw threads and other methods are generally used to improve the bonding strength of joints.

Three, adhesive construction

Surface treatment qualified metal parts, its aggrandizement surface can use brush besmear, spray, roll besmear, knife is scraped, the method such as impregnation undertakes applying to fall, which kind of method is used, the characteristic that can decide according to the size of the piece and adhesive.

Four, adhesive and vulcanization

There are hot paste and cold paste two methods, viscose can be used for mechanical or for compacting. Film should not be too thick, using thin film layer by layer paste to the required thickness method. General hard film thickness is 0.1 to 1.5 mm, soft film thickness is not more than 4 to 5mm, so as not to contain bubbles in the film. Curing adhesion can be divided into hot curing and cold curing two. Hot curing bonding is to stick the metal parts of the film in a certain pressure and temperature, so that the adhesive and metal complete bonding. Cold curing adhesion is the use of adhesive at room temperature conditions, through a certain time of pressure to allow natural curing, so that the vulcanized adhesive and metal bonding. Pressure is an indispensable condition of bonding process, pressure and temperature, depending on rubber products and their formula.

To sum up, in order to realize the adhesion of silicone rubber and metal rubber products, according to the four steps, the metal surface, joint, adhesive, bonding method, but the silicone products factory in implementation should pay attention to the following points, such as metal surfaces treated by chemical method if not handled in time will be affected by dust, such as greenhouse gas pollution and oxidation rust, and, The construction of the binder is required to be uniform and have a certain amount of adhesive, the ambient temperature of sizing should be controlled in 15~35℃, the relative humidity is below 70%, so that the solvent completely volatile and avoid dew on the surface.