Nano-silica is an important high-tech ultra-fine inorganic new material. Because of its small particle size, large specific surface area, strong surface adsorption, large surface energy, high chemical purity, good dispersion performance and good stability, it has advantages in many disciplines and fields, and has an irreplaceable role. Nano-silica, commonly known as "ultra-fine white carbon black", is widely used in various industries as an additive and catalyst carrier.
Adding nano-silica to the base powder coating of the epoxy resin will be completely different in structure from the coarse-grained SiO2. Added epoxy powder coating. Coarse-crystalline SiO2 is generally added as a reinforcing agent, mainly distributed in the middle of the chain of polymer materials, and nano-silica is extremely strong due to the severe surface coordination, large specific surface area and surface under-oxygenation. The activity is easy to bond with the oxygen of the epoxy ring molecule, which enhances the bonding force between molecules. At the same time, some of the nano-silica particles are still distributed in the voids of the polymer chain, followed by coarse-grained SiO2. Compared with the particles, it exhibits high flowability, which greatly improves the strength and toughness of the epoxy powder coating with the addition of nano-silica. In addition, the addition of nano-silica can also improve the wear resistance and aging resistance of the coating and improve the surface finish of the coating. Because nano-silica is a loose, amorphous powder, its addition to a powder coating system prevents the powder from agglomerating at high temperatures in the summer, extending the shelf life of the powder coating product. In the production experience, it is best to adopt an additional method.