First, improper selection of glue

Solution: Choose the right adhesive

Second, the metal surface treatment failure, so that the substrate of the glue coating for vulcanization, can not be very good with the metal surface to achieve physical adsorption

1. Coarse the metal surface to ensure that the substrate glue can be closely attached to the metal surface when vulcanized. Its common treatment methods are: the metal embedded in the product sandblasting and shot blasting;
2, the metal surface can not have rust, can not stick with oil, dust, water droplets and other impurities;

Third, glue coating process stability is poor, glue is too thin, less leakage, residual solvent, etc

1, pay attention to surface coating operation, to prevent glue leakage, less coating; The importance and influence of surface coating (coating surface film formation and coating surface tension, gravity, construction mechanical force, material intermolecular force and chemical reaction force. Therefore, the quality of the surface coating is affected by the comprehensive effects of these forces, so it is very important to use different techniques, superb skills and skilled skills.
2. The metal parts coated with glue should be fully dry, so that the solvent is fully volatilized, to prevent the residual solvent from volatilization at the time of vulcanization, resulting in bonding failure;
3, to ensure that the metal surface has a certain thickness of glue. In this way, on the one hand, it can ensure that there is sufficient glue on the metal surface and the glue into the mold cavity diffusion and co-crosslinking effect is fully carried out, so that the metal surface and vulcanized rubber are fully bonded; On the other hand, a certain modulus gradient layer can be realized from the metal surface to the product surface, so that there is a gradual transition from soft to hard between the rubber surface and the metal insert.