The addition of nano-silica to the coating improves the scrub resistance, strength, hardness, and the like of the coating. Adding a small amount of nano-silica to the coating, the performance of the coating can be improved from 250h to over 600h, the scrub resistance is increased by more than 10 times, the drying time is greatly reduced, and the suspension stability of the raw material is poor and thixotropic. Problems such as poor quality and low finish are also well resolved. The canning effect of the coating added with nano-silica is also obviously improved, the coating is not delaminated, anti-sagging, good workability, greatly improved stain resistance, and has excellent self-cleaning property and adhesion.

Technical indicators：

Application characteristics of nano-silica in coatings:

1. washable: washability improved from thousands to tens of thousands of times

2. weather resistance: weather resistance can be increased by about 3 times, adding a certain amount of nano-silica can improve the UV aging resistance of traditional coating products from the original 250h to more than 600h.

3. Stain resistance and self-cleaning: Studies have shown that the stain resistance and self-cleaning properties of the coating film can be improved by the following methods: First, the microporous structure of nano-silica is used, and the coating film is applied by a certain process. The surface forms a geometrically complementary (such as convex and concave phase) interface structure in the nanometer scale, so that it adsorbs air to form a stable gas barrier film on the surface; the second is to surface treatment of the nano silica particles, so that The surface is amphiphilic or double-sparing, which effectively improves the wettability of the rainwater on the surface of the architectural coating film and the adhesion of the dust, and improves the stain resistance and self-cleaning ability of the coating film.

4. Antibacterial property: In the coating, when the addition amount of nano silica exceeds 0.5%, the coating exhibits an obvious antibacterial effect.

5. hydrophobic anti-corrosion: Nano-silica hydrophobic anti-corrosion coating, not only has good adhesion, corrosion resistance, but also has high density and resistance to ion permeability.

6. Transparency: Nano-silica can ensure the transparency of nano-modified coatings. The use of nano-silica can produce a highly wear-resistant transparent coating, which improves the wear resistance by more than 10 times.

7. Hardness: When the nano-silica particles are uniform in the organic material and the individual particles are dispersed, the nanoparticles enhance the organic material like a rigid chain, thereby improving the hardness of the coating film of the UV-curable coating, up to 2.5. More than double.

8. Thermal stability: In the UV-curable coating, nano-silica can increase the glass transition temperature of the coating film.

9. Viscosity: The addition of nano-silica can significantly increase the viscosity of the coating.

Add amount:

It has been proved by practice that 2% nano-silica is added to the coating to achieve the best hardness, adhesion, weather resistance, viscosity and anti-settling ability of the coating and stability of the coating. The recommended dosage is 0.5-2%, and the individual product system can reach more than 10%, depending on the actual situation.

Instructions:

The dispersion of nano-silica can be carried out using various methods such as milling, high-speed shearing, ball milling, sanding, ultrasonic dispersion, and the like, with the first two methods being used more. Nano-silica is added to the coating, and the dispersion step is divided into a one-step method and a two-step method.

The one-step method refers to adding nano-silica into the raw material system of the product to directly obtain the required content of the product. The one-step method is characterized by simple production process, and is suitable for large-volume production of a single product.