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What is the difference between nano silica and silica

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What is the difference between nano silica and silica
Silica is actually silica, but it is not ordinary silica. It is silica with a certain branch structure. In terms of preparation methods, it is divided into precipitated silica and fumed silica. As far as the current situation is concerned, precipitation silica is mainly used for green tires. If used with a silane coupling agent, it can reduce the rolling resistance of the tire and improve the puncture resistance, but the wear resistance is worse than that of carbon black formulations. Fumed silica is mainly used for silicone rubber, and light-colored, white, and colored tires. Of course, it is also widely used in coatings, cosmetics and inks. The particle size and structure can be adjusted, and the surface functional groups can also be adjusted, so it can be selected according to needs.
Nano-silica means that the size of the silica particles has reached the nanometer level. reach this level. The name of nano-silica mainly appears in scientific research fields such as medicine and biomedicine, and 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 basically no structure, it is added to the coating system, that is, it plays a filling role, and the thixotropy effect is not good, that is, the improvement of rheological properties is not large.

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

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