The particle size of white carbon black is very small, the primary particle size is about 0.01 ~ 1 μm, and there are a large number of hydroxyl groups on the surface of its particles. According to research, there are three types of surface hydroxyl groups of white carbon black: one is isolated Isolate hydroxyl groups; two are twin hydroxyl groups attached to a Si atom; and three are adjacent hydroxyl groups that are connected together and form hydrogen bonds with each other. The presence of hydroxyl groups makes them very hydrophilic . At the same time, there is a more active -Si-OH bond on the surface of the particles, which is easy to bond with other ions to play a reinforcing role. The surface of white carbon black also has a uniform layer of siloxane and silanol groups, these groups have strong water absorption. And silanol's reactive nature makes it easy to be modified