Use of silica

Obtained from the silica matting agent in many ways, according to its manufacturing process can be divided into two categories. One is the hydrothermal method of manufacture, production of silica morphology is relatively soft. Products made with silica gel texture is hard. After treatment, the two products can be made of standard silica matting agent. Process is the use of organic (wax) or an inorganic material to a certain degree of the silica surface modification. Compared with the silica matting agent, the treated silica with a different particle size, size distribution and pore volume. Hydrothermal method matting agent in particle size and distribution are also different. Unprocessed and processed products are different. Currently only one matting agent suitable for special occasions, the matting agent using pyrolysis manufacture, possess strong extinction efficiency, and particularly suitable for water-based coating systems.
Silica matting effect is relatively strong, higher concentrations may result in increased viscosity. A precipitate during storage of the trend, particularly in untreated silica. In order to avoid the accumulation, we can use paraffin or fumed silica. The matting agent can be adjusted 45 °, 60 ° and 85 ° azimuth extinction. Added silica matting agent can be cover coated with paint. All of these are 'stir-in' products.
Synthetic aluminum silicate can partially replace titanium dioxide used as a high-quality extender can be used in emulsion primer. The product was dried latex paint film can exhibit a balanced matting effect. In the long oil alkyd resin system can be used as a matting agent, but must be dispersed pigments and fillers. In addition to the powder coating systems, the silica matting agent can be applied to all of the coatings.