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


Nano silica, which means that the size of silica particles has reached the nanometer level, is named from the morphology and structure of the particles. The preparation method can be any one. Even if it does not reach the nanometer level at the beginning, it can be crushed to reach this level. The name of nano silica mainly appears in the fields of medicine, biomedicine and other scientific research. It is often used as a carrier or as modified particles, that is, it is often surface modified. If it is spherical nano silica with basically no structure, it will play a filling role when added to the coating system. The thixotropic effect is not good, that is, the rheological property is not improved much.


The method of dispersing the two fillers into inorganic filler pigments is nothing more than some conventional methods in industry, such as stirring evenly in the liquid phase, shearing, crushing and dispersing with a two roll or three roll mill, etc. the key is the formulation of the formula, the selection of filler varieties, and the selection of equipment.