Nano silica SIO2 is an amorphous white powder which refers to its agglomerate material. It is a member of nano-materials. Its structure is very special and exhibits strange or abnormal physical and chemical properties. Because nano-silica SIO2 has small size effect, surface interface effect, quantum size effect, macro quantum tunneling effect and excellent light, force, electricity, heat, magnetism, radiation, absorption and other special properties, as well as its special properties at high temperatures. The unique characteristics of high strength, high toughness, and good stability make Nano SIO2 widely used in various fields. For example, addingnano SIO2 to ceramics can play a role in strengthening and toughening; adding nano-SIO2 to rubber can produce new rubber with special properties such as color, high strength, and good insulation; adding nano-SIO2 to plastics engineering can Improve the abrasion resistance and scratch resistance of the plastic surface; adding nano-SIO2 to the adhesive and sealant can improve the bonding effect and increase the sealing performance of the glue; adding nano-SIO2 to the textile can prevent ultraviolet and far infrared , Antibacterial deodorization, aging resistance, etc.; adding nano-SIO2 to the coating can greatly improve the overall performance of the coating. In addition, nano SIO2 is also widely used in research in biomedical engineering, optics, wood, electronic packaging materials, resin-based composite materials, organic glass, catalysts and catalyst carriers, agriculture and food industries, artificial teeth, cosmetics and antibacterial materials.

1. The application of nano-silica SIO2 in architectural coatings
Adding nano-silica to architectural coatings can improve the coating's adhesion, scrub resistance, weather resistance, strength hardness, toughness and elasticity, aging resistance, antibacterial, and UV resistance, and significantly improve the coating's self-cleaning and waterproofing Anti-seepage, anti-wear, corrosion, color retention and other properties, so it has a good effect in modifying exterior wall coatings.

2. Application of nano-silica in metal protective coatings
Adding nano-SIO2 and TIO2 can increase the strength of the carbonaceous layer after expansion of the fire retardant coating, and extend the fire resistance limit of the steel structure. When 1.5% mass fraction of nano-SIO2 is added, the fire resistance limit of 110 min can be reached.

3. Application of nano-silica in plastic coatings
The modified nano-silica is beneficial to improve the thermal stability of the composite material, delay the thermal oxidative degradation of polyethylene, and significantly improve the flame-retardant properties of halogen-free flame-retardant polyethylene. When the amount of filler is the same, it can be obtained Materials with better mechanical properties and flame retardant properties.

4. Application of Nano Silica in UV Curing Coatings
Nano-silica has strong ultraviolet absorption and infrared reflection characteristics. The spectrophotometer test shows that it has an absorption rate of more than 70% for ultraviolet light within a wavelength of 400nm, and a reflectivity of more than 70% for infrared light within a wavelength of 400nm. It can be added to the paint to form a shielding effect on the paint, achieve the effect of anti-ultraviolet aging and thermal aging, and increase the heat insulation of the paint.

5. Application of nano-silica in color inkjet printing paper coating
There are a lot of pores and cracks on the surface of high gloss color inkjet printing paper. Primer can significantly improve the performance of the paper, and nano-scale silica can provide higher smoothness, absorption, color density and image quality to the paper.

6. Application of Nano Silica in Wood Coatings
In water-based wood coatings, the addition of nano silica gel can increase the hardness of the coating film, improve the water resistance and aging resistance of the coating film, and also improve the anti-blocking property of the coating film. In the closed primer, the nano silica gel has a small particle size and can easily enter the small holes of wood or fiberboard, fill and seal these holes, and then bond with the substrate after drying to form a film. Water-insoluble coating, which has a good sealing effect. In the water-based primer, a certain amount of nano silica sol can be used to speed up the release of water in the primer.
Adding a certain amount of nano-silica sol to the water-based topcoat can significantly improve the water resistance, anti-blocking, and hardness of the water-based topcoat.

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