White carbon black is actually silicon dioxide, but it is not ordinary silicon dioxide. It is silicon dioxide with a certain branching structure. From the perspective of preparation methods, it can be divided into precipitated white carbon black and fumed white carbon black. As far as the current situation is concerned, precipitated silica is mainly used for green tires. If it is used with silane coupling agent, it can reduce the rolling resistance of tires and improve puncture resistance, but the wear resistance is worse than that of carbon black formula. The fumed silica is mainly used for silicone rubber, light, white and color tires, and of course, it is also widely used in coatings, cosmetics and inks. In addition to its dyeing and tinting properties, it also has thixotropy. Because the particle size and structure of silica can be adjusted, and its surface functional groups can also be adjusted, it can be selected according to needs.


Nanometer silicon dioxide, which means that the size of silicon dioxide particles has reached the nanometer level, is named according to the morphology and structure of the particles. The preparation method can be any one. Even if it has not reached the nanometer level at the beginning, it can be crushed to reach this level. The name of nano silica mainly appears in the scientific research fields such as medicine and biomedicine. It is often used as a carrier or as a modified particle, that is, it is often surface modified. If it is spherical nano silica with little structure, it will play a filling role when added to the coating system. The thixotropy effect is not good, that is, the rheological property is not improved much.


The method of dispersing the two fillers into the inorganic filler pigment is nothing more than some conventional industrial methods, such as mixing evenly in the liquid phase, shearing, crushing and dispersing with a two roller or three roller open mill, etc. The key is to formulate the formula, select the filler varieties, and select the equipment.