At present, the industrial production of white carbon black is mainly based on the precipitation method. The surface of the white carbon black produced contains a large number of polar groups such as hydroxyl groups, which makes it easy to adsorb water molecules, poor dispersion, and prone to secondary aggregation. Problems, thereby affecting the industrial application effect of white carbon black. Therefore, most of the white carbon black needs surface modification treatment before industrial application to improve its application performance.

At this stage, the chemical surface modification of silica mainly includes surface graft modification, coupling agent modification, ionic liquid modification, macromolecular interface modification and combined modification, etc. Although each modification process has its own advantages And characteristics, but the current industrial application is mainly based on coupling agent modification.

Surface modification methods and characteristics of white carbon black

1. Surface graft modification of silica
The principle of the surface graft modification method is to graft a macromolecular polymer with the same properties as the matrix polymer (such as rubber) on the surface of the silica by chemical grafting. On the one hand, it can enhance the force between the particles and the matrix. And change the polarity of the particle surface, on the other hand, it can also improve the dispersibility of the silica itself.

It is suitable for grafting polymers with smaller molecular weight, and the conditions are harsh when the molecular weight of the grafted polymers is higher.