What are the components of silica and their main applications?

The white carbon black is roughly classified into a precipitated white carbon black and a fumed white carbon black according to a production method. The fumed silica is normally white amorphous flocculent translucent solid colloidal nanoparticles (particle size less than 100 nm), non-toxic, and has a large specific surface area. The fumed silica is all nano-silica, the purity of the product is up to 99%, the particle size can reach 10~20nm, but the preparation process is complicated and expensive; the precipitation method white carbon black is divided into the traditional precipitation method white carbon black and Special precipitation method white carbon black, the former refers to silica produced by using sulfuric acid, hydrochloric acid, CO2 and water glass as the basic raw materials, and the latter refers to the use of supergravity technology, sol-gel method, chemical crystal method, secondary crystallization Silica produced by a special method such as a method or a reverse micelle microemulsion method. Precipitated silica is mainly used as a reinforcing agent for natural rubber and synthetic rubber, a toothpaste friction agent, and the like. The fumed silica is mainly used as a reinforcing agent for silicone rubber, a coating material and an unsaturated resin thickener. Ultrafine silica gel and aerogel are mainly used as a coating matting agent, a thickener, a plastic film opening agent and the like.

As an environmentally friendly and excellent auxiliaries, white carbon black is mainly used in rubber products (including high temperature vulcanized silicone rubber), textiles, paper, pesticides and food additives. From the growth rate of white carbon black in 2004-2008, the compound annual growth rate of the four years is 13.3%. In 2009, there were more than 60 white carbon black production enterprises in China, with a production capacity of about 1 million tons and a production capacity of 750,000 tons. China's production and sales volume ranks first in the world.

Thanks to the growth in demand in the tire manufacturing industry, silicone rubber industry, coatings industry, new energy and other fields, it is expected that the annual growth rate of China's precipitation white carbon (silica) will be about 10%. In 2015, Asia will become the largest market for highly dispersed white carbon black, and its demand growth rate will be much higher than the global average of 9% growth rate, reaching 15% or higher. China accounts for 40% of the Asian market and will become the world's largest single market.