White carbon black particles are fine and have a large specific surface area. The reinforcing effect in rubber is significant. Usually, carbon black is used as a reinforcing agent in light-colored reclaimed rubber products. In actual production, white carbon black can not only be used as a reinforcing agent, but also can increase the adhesion between the rubber and the skeleton material. For example, the combination of white carbon black and cobalt salt can significantly improve the adhesion between the reclaimed rubber and the steel wire. Sex. So why can white carbon black improve the adhesion between reclaimed rubber and framework materials? What problems should be paid attention to when using white carbon to increase adhesion?
1. The reason why white carbon black improves the adhesion between reclaimed rubber and skeleton material
The hydrogen bonds in white carbon black easily absorb moisture in the air, where the hydrogen bonds can associate with hydroxyl groups to improve the cohesion between the particles; white carbon black can be adsorbed into the chemical state water with the free water in the reclaimed rubber, thereby preventing the water from The destruction of the adhesive structure increases the adhesion between the reclaimed rubber and the skeleton material; the polar groups on the surface of the white carbon black will adsorb the vulcanized rubber in the formula during the action, delay the vulcanization, and provide more for the adhesion reaction Time, the fluidity and permeability of the reclaimed rubber are better, and the adhesion is improved.
2. Improve the adhesion between the reclaimed rubber and the skeleton material. The amount of silica should not be too high.
When using white carbon black to improve the adhesion between the reclaimed rubber and the skeleton material, the hydrophilicity of the white carbon black will cause it to be difficult to evenly disperse in the rubber compound. If the amount is too high, it will produce a gel, the rubber compound will harden, and the recycled rubber compound The heat generated during refining is large, and production is difficult to proceed normally. Therefore, in actual production, the amount of silica should be reasonably controlled to avoid gelation.
3. Improve the adhesion between the reclaimed rubber and the skeleton material. Pay attention to the timing of adding white carbon black
In order to improve the dispersion of silica in reclaimed rubber and avoid the generation of gel, rubber product manufacturers should properly increase the shear force during the initial mixing and add a small amount in batches to improve the dispersion of silica 2LLYY76 in reclaimed rubber Properties, reduce heat generation; appropriately increase the mixing temperature during mixing, to a certain extent consume the water adsorbed on the surface of the white carbon black, reduce the cohesion between the particles, promote the uniform dispersion of the white carbon in the rubber compound, and avoid the generation of gel.
When using white carbon black to increase the adhesion between the reclaimed rubber and the frame material, rubber product manufacturers also need to consider the role of the white carbon black and other compounding agents and the material of the frame material, adjust the formula reasonably, and further improve the reclaimed rubber and the frame material The adhesion between.