White carbon dioxide is hydrated silicon dioxide, which is a fine powder or ultrafine particle-like silica. High-purity silica has a SiO2 content of 99.8%, is light, and has a primary particle size of 99.8%. Vapor-phase white carbon black can be classified into a hydrophilic type and a hydrophobic type depending on whether or not surface treatment has been performed, and it can be classified into different types according to the size of the specific surface. The domestic fumed silica market is almost monopolized by several large foreign companies such as Degussa, Cabot, and WACKER. There are only a few small-scale installations in China. For example, Guangzhou Ji Boshi Technology Industrial Co., Ltd., on the basis of absorbing and digesting advanced foreign technologies, has undertaken bold technological innovations and has taken the lead in establishing a production line for the production of fumed silica using by-products of organic silicon. The annual output of a single machine has reached 500 tons. Currently, there are four types of hydrophilic products; Jilin Research Institute of Chemical Industry uses organic silicon monomer by-products to produce fumed silica. The capacity of foreign gas-phase silica single-unit installations is above 4,000 tons per year. The Cabot Corporation's single-unit installations can reach an annual production capacity of 9,000 tons. The foreign gas-phase white carbon varieties are all available and have a large number of grades. The United States Cabot Corporation non-treatment fumed silica has a total of more than 10 varieties (including three compressed varieties), treatment of white carbon mainly TS-720, TS-610, TS-530. In contrast, the number of hydrophilic white carbon series in China is small, and the modified white carbon black series has just started to develop. There is a gap between the capability and grade of single-phase fumed carbon black equipment and the world advanced level. However, our country has already solved the world-class chemical project, nano-silica, breaking the monopoly of Germany, the United States, Japan, and a few developed countries in this field. The successful development and promotion of the “Nano-silica gas-phase combustion preparation technology and equipment development†jointly undertaken by the Key Laboratory of Ultrafine Materials Preparation and Application of East China University of Science and Technology and Shanghai Chlor-alkali Co., Ltd. will form a production value of 1 billion yuan, effectively Promote the development of organic silicon and other industries in China. In February 2004, China National Bluestar (Group) Corporation signed a contract with Cabot Corporation of the United States. The two parties will invest approximately US$30 million to build China's largest and world-class fumed silica production plant, Cabot Bluestar ( Jiangxi) Chemical Industry Co., Ltd. It is expected to be completed in 2005 with an annual capacity of 5000 tons. 1.2 Application of fumed silica White fumed silica is widely used in silicone rubber, cable and unsaturated polyester resins, adhesives, paints, inks and copier toners, foods and cosmetics. Thick, anti-caking, control system rheology and thixotropic effects. 1.2.1 Application in Silicone Rubber Vapor-phase silica is widely used in room temperature vulcanized silicone rubber and high temperature vulcanized silicone rubber. They are often dispersed in the matrix in the form of agglomerates to form a three-dimensional network structure, and silicone rubber. The contact surface of the base material is large, and the cross-linking points formed in the vulcanization process are large, thereby thickening and reinforcing the silicone rubber. The three-dimensional network structure formed by fumed silica has relative stability and is in a state of “elasticityâ€. Under the action of external forces, it will be temporarily damaged, which will reduce the viscosity of the system and exhibit good fluidity; After the shear force is removed, the three-dimensional network structure will quickly return to its pre-stressed state, giving the system a good thixotropy. In addition, since the fumed silica has a very small particle size, and the particles are spherical, and dispersed in the binder to form a uniform system, they often have good optical properties and can produce white transparent silicone rubber products. Room temperature vulcanized acidic silicone adhesives produced with fumed silica as a filler, have a wide range of consistency and effective vulcanization properties, and have excellent adhesion to a variety of substrates with or without primers , Has excellent storage stability at room temperature, widely used in the construction industry. 1.2.2 Applications in Plastics and Unsaturated Polyester Resins Fumed silica is also commonly used in plastics and elastomers as well as in unsaturated polyester resins. Adding a small amount of fumed silica in addition to traditional fillers during plastic mixing will produce a significant reinforcing effect, which will greatly increase the hardness and mechanical properties of the material, thereby improving the processing process and product performance. The addition of a small amount of fumed silica to the unsaturated polyester resin gives the resin excellent transparency and excellent physical properties, all of which contribute to the quality of downstream products. Vapor-phase white carbon black has an irreplaceable role in industrial development, but due to its high price, it often limits its wider application. For example, the rubber industry is still using a large amount of precipitated silica.
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