Application of Silica in Powder Coatings
In powder coatings, silica is mostly used as a loose flow agent to prevent caking and improve spraying efficiency. There are also auxiliary uses for matting and sand patterning. The market price of silica has a wide range, ranging from less than 10 yuan/KG to more than 100 yuan/KG. According to different production processes, it is divided into gas phase method and precipitation method. By origin, domestic and imported. Gas phase method and imported products are more expensive.

     The addition of silica in powder coatings is mostly external. Some are mixed with the flakes into the pulverizer, and some are added to the sieve before the screen. The measurement requirements of these two types must be accurate and uniform. The general dosage is 0.2-0.3% of the total material.

     What is added in the inner extrusion is to make matting or sand pattern, and the addition amount is in the range of 0.5-3%. At this time, the cheaper type of precipitation method is mostly used, because after extrusion, its surface is coated and infiltrated by resin, and its function cannot be displayed.