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In coatings, the matting agent achieves the matting effect by changing the optical properties of the surface of the coating film. By introducing micro-roughness to the surface of the coating film, the matting agent can change the direction of reflection of light, so that the light is reflected in all directions to obtain a matte coating film. This micro-roughness can be achieved by adding pigments or fillers to the coating. Among them, silica, as an important inorganic matting agent, reduces the gloss of the coating film through its special physical structure, thereby achieving the desired matting effect.
Silica has high chemical purity and is insoluble in water, various organic solvents, and general acids and alkalis. It only reacts with concentrated alkalis and hydrofluoric acid, and has high chemical inertness. Its refractive index is 1.46, so it has good transparency. Silica matting agent treated with wax will not produce hard precipitation in solvent-based coatings during storage. Because it is a porous substance, a low amount of addition can produce strong extinction properties.
INDEX | STANDAR |
Apperance | White powder |
SiO2 % | ≥99 |
Lost on drying % | ≤7 |
PH | 3-7 |
Pore volum ml/g | 1.3-1.8 |
Specific surface area㎡/g | ≥200 |
