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Fumed silicon dioxide, molecular formula:SiO2, white fluffy powder, porous, non-toxic tasteless non-polluting, high temperature. At the same time it has a chemically inert and special thixotropic properties can significantly improve the tensile strength of rubber, tear resistance and abrasion resistance, improved rubber strength is increased several times. Liquid systems, adhesives, polymers, rheology and thixotropy control, used as anti-settling, thickening, anti-sagging reinforcing additives, HCR and RTV-2K silicone rubber, can be used to regulate the free flow and as an anti-caking agent to improve the powder properties, etc.

Fumed silicon dioxide is an extremely important new tech ultra-fine inorganic materials, because of their small particle size, larger the surface area, and strong surface adsorption, surface energy, high chemical purity, good dispersibility, heat resistance, resistance, etc. have specific performance, with its superior stability, reinforcement, thickening and thixotropic, in many disciplines and areas of unique characteristics, it has an irreplaceable role. Nano-silica, commonly known as "ultra-fine silica", is widely used in various industries as additives, catalyst support, petrochemical, bleaching agents, matting agents, rubber reinforcing agent, filling plastic agent, ink thickener, soft metal polishing agent, filler insulation insulation, senior cosmetics packing in various fields and coating materials, medicine, environmental protection and so on. And it provides a basis for new materials and technology to ensure the development of related industries.

Preparation:

Chemical vapor deposition (CAV) method, also known as fumed, dry method or a combustion method. Its raw materials generally are silicon tetrachloride, reaction from oxygen (or air) and hydrogen, high temperature. The reaction of the formula: SiCl4 + 2H2 + O2—— SiO2 + 4HCl. Air and hydrogen, respectively, after pressing, separation, dehydration cooling, silica gel dried, dust filter into the hydrolysis synthesis furnace. The silicon tetrachloride after the distillation feed to a distillation column, heated and vaporized in the evaporator, and dried, filtered air as the carrier, hydrolysis to the synthesis furnace. Silicon tetrachloride at high temperature gasification (flame temperature of 1000 ~ 1800 ℃), with an amount of hydrogen and oxygen (or air) in a vapor phase hydrolysis at a high temperature of about 1800 ℃; fumed silicon dioxide particles generated at this fine, with the gas to form an aerosol, it is not easy to capture, so it first gathered into larger particles in the accumulator, then collected by the cyclone, and then into the deacidification furnace, purged with nitrogen air fumed silica PH value to 4-6 is finished.


 

 

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