There are a large number of micropores on the surface of the white carbon particles, which have a strong adsorption effect on the vulcanization accelerator, so the vulcanization is significantly delayed. In order to avoid this phenomenon, on the one hand, the amount of the accelerator can be appropriately increased; on the other hand, an active agent can be used to preferentially adsorb the active agent on the surface of the white carbon black, thereby reducing its adsorption of the accelerator.
        Active agents are generally nitrogen- or oxygen-containing amines, alcohols, and alcohol amine low-molecular compounds. For NR, amines are more suitable, such as diethanolamine, triethanolamine, butanediamine, hexamethylenetetramine, and the like. For SBR, alcohols are more suitable, such as hexanetriol, diethylene glycol, glycerol, and polyethylene glycol. The amount of active agent depends on the amount of white carbon black, PH value and rubber variety, and the general amount is 1 ~ 3% of white carbon black.