Anticorrosive Paints Chemicals Powder Silicon Dioxide

Anticorrosive coating refers to a liquid or solid material that can form a thin film on the surface of an object under certain conditions

for protection, decoration or other special functions (insulation, rust prevention, mildew prevention, heat resistance, etc.). Because

most of the early coatings used vegetable oil as the main raw material, they were also called paints. Synthetic resins have mostly or

completely replaced vegetable oils, so they are called coatings.

So what is the role of silica in anticorrosive coatings?

In the formulation of anticorrosive coatings, silica is used as a thickening, thixotropic and anti-settling additive. The thickening, anti-settling,

suspension and other effects make additives such as fillers evenly dispersed in the resin without precipitation; the thixotropic effect gives the

coating excellent anti-sagging properties and thick coating properties, improving the construction performance.

When silica is dispersed in a non-polar liquid, the silanol groups on the surface of different particles interact through hydrogen bonds to form

bridges, and the composition of this three-dimensional structure produces a thickening effect. When the system is affected by mechanical external

forces, such as stirring or shaking, the structure is destroyed. The type and duration of the mechanical external force determine the extent of the

damage, and the result is that the thickened system becomes liquid again. If kept static, the silica particles will connect to restore the original

viscosity. This phenomenon is called pseudoplasticity.

Anti-corrosion coatings are mostly systems such as epoxy resins, polyurethane resins, and vinyl resins. These resins have strong polar groups and

generally use Hydrophilic Fumed Silica, which is easy to solvent effect. The viscosity and suspension effect after dispersion are good, but after being

placed for a week to ten days, the polar groups destroy the hydrogen bonds of the network structure, resulting in hydrogen bond cracking, thinness,

no thixotropy, filler precipitation and other problems. Therefore, it is recommended to use hydrophobic modified Fumed Silica, which has strong stability

and avoids solvent effect.

The thickening and thixotropy of silica depends largely on the dispersion strength, and at least a high-speed disperser is required. In order to achieve a

good dispersion effect, a rotor stator dispersion or a ball machine or a three-roller dispersion can be used.

Anticorrosion Pigments, 
Inkjet Receptive Coating, 
Matting Agent