Nano SiO2 is widely used in many aspects, and here are some applications of silica nanopowder in coatings.

1. Application of nano-silica SIO2 in architectural coatings
Adding nano-silica to architectural coatings can improve coating adhesion, scrub resistance, weather resistance, strength hardness, toughness, elasticity, anti-aging, anti-bacterial, anti-ultraviolet and other characteristics, significantly improve coatings’ property of self-cleaning, waterproofing, anti-seepage, anti-wear, anti-corrosion, color retention and other properties, so it has a good effect on modified exterior wall coatings.

2. Application of nano-silica in metal protective coatings
The addition of nano-SIO2 and TIO2 can increase the strength of the carbonaceous layer after the expansion of the fire retardant coating and prolong the fire resistance of the steel structure. When adding 1.5% by mass of nano-SIO2, the fire endurance of 110 min can be achieved.

3. Application of nano-silica in plastic coatings
The modified nano silica is beneficial to improve the thermal stability of the composite, delay the thermal oxidative degradation of the polyethylene, and significantly improve the flame retardant performance of the halogen-free flame retardant polyethylene. A material with better mechanical properties and flame retardancy.

4. Application of nano-silica in UV-curable coatings
Nano-silica has extremely strong UV absorption and infrared reflection properties. The spectrophotometer test shows that the absorption rate of ultraviolet light within a wavelength of 400 nm is as high as 70% or more, and the reflectance of infrared light within a wavelength of 400 nm is also more than 70%. It is added to the coating to form a shielding effect on the coating to achieve anti-UV aging and heat aging, and at the same time increase the thermal insulation of the coating.

5. Application of nano-silica in color inkjet paper coating
There are a large number of micropores and cracks on the surface of high gloss color inkjet paper. Primer can significantly improve sheet properties, and nanoscale silica provides high smoothness, absorbency, color density, and image quality.

6. Application of nano-silica in wood coatings
In the waterborne wood coating, the addition of the nano silica gel can improve the hardness of the coating film, improve the water resistance and aging resistance of the coating film, and at the same time improve the blocking resistance of the coating film. In the closed primer, the nano-silica gel has a small particle size and can be easily inserted into fine pores of wood or fiberboard. The pores are filled and sealed, and can be bonded to the substrate after drying and forming. Insoluble in water coating, which has a good sealing effect. A suitable nano-silica sol can be properly blended in the aqueous primer to accelerate the release of moisture in the primer.
It can improve the drying speed, increase the hardness of the coating film, and reduce the cost of the primer. Adding a certain nano-silica sol to the water-based topcoat has obvious improvement in water resistance, anti-blocking and hardness properties.