Because of the large specific surface area of white carbon black, it always tends to re-aggregate. In addition, it is easy to absorb water in the air, which makes it easy to produce strong hydrogen bond association between hydroxyl groups, which further improves the cohesion between particles, so white carbon black The mixing and dispersion of carbon black is much more difficult than that of carbon black, and when a large amount is mixed, it is easy to form a gel, hardening the rubber, and generating heat during mixing. In order to obtain a good dispersion, it is required to maintain as high a shear force as possible during the initial mixing, so that these aggregate particles of silica can be destroyed as much as possible without causing excessive mechanical degradation of the rubber molecular chain. . For this reason, white carbon black should be added in small quantities in batches to reduce heat generation. Properly increasing the mixing temperature will help remove part of the white carbon black surface adsorbed water, reduce the cohesion between particles, and help the dispersion of the white carbon black in the rubber compound.