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With the continuous development and progress of science and technology, the application range of silica gel is also becoming more and more extensive. For example, in building materials, the role of silica gel cannot be ignored. Silica is found in some high-end materials.
These are all determined by the characteristics of silica gel. Silica gel itself is rich in microporous structure and has good adsorption properties. Moreover, the chemical properties are stable and no volatile substances will be produced. At the same time, the whiteness, purity and pore structure of silica gel can all be controlled in production. These advantages have expanded its application field.
The matting research of traditional coatings shows that effective matting or reducing gloss depends on the formation of fine rough surfaces on the surface of the coating. To form a fine rough surface of the coating, two conditions must be met: one is that there are a large number of matting agent particles of suitable particle size in the coating film, and the other is that the volume shrinkage occurs during the drying of the coating film.
The matting agent used in the coating should be able to meet the following basic requirements:
The refractive index of the matting agent should be as close as possible to the refractive index of the film-forming resin (the refractive index of most resins is 1.4-1.6);
Wear resistance, scratch resistance;
Good dispersion andRedistribution performance.
The average particle size and particle size distribution of silica are important factors affecting the matting effect of the final paint film. Whether the average particle size is appropriate and whether the particle size distribution is concentrated directly determines the degree of extinction of the coating film and the appearance and feel quality of the coating film. The average particle size of silica should be as close as possible to the thickness of the coating film. The particle size distribution of silica should be as concentrated as possible to reduce the proportion of too large particles and too fine powders, so as to better improve the extinction efficiency.
