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Brief introduction of fumed silica

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Fumed silica, molecular formula: sio2 White fluffy powder, porous, non-toxic, tasteless, pollution-free, high temperature resistant. At the same time, its chemical inertia and special thixotropic properties significantly improve the tensile strength, tear resistance and wear resistance of rubber products, and the strength of rubber is increased dozens of times after improvement. Rheology and thixotropy control of liquid systems, adhesives, polymers, etc., additives for anti sedimentation, thickening and anti sagging, reinforcement of HCR and rtv-2k silicone rubber, free flow adjustment and anti caking agent to improve powder properties, etc. Domestic and foreign brands of fumed silica domestic: hydrophilicity: hl-150hl-200hl-200mhl-300hl-380 hydrophobicity: hb-215hb-612hb-615hb-620hb-630hb-132hb-135hb-139

Other domestic hydrophilicity: y150, Y200, y300, Y380

Import: German Walker: hydrophilicity: V15, v15p, N20, n20p, T30, T40

Cabot: hydrophilicity: LM-150, m-5, eh-5

Tokuyama, Japan: hydrophilicity: qs-102, qs-20ls, qs-30, qs-40

Note: domestic brand and imported brand have basically the same functional characteristics.


characteristic

Fumed silica is one of the most important high-tech ultra-fine inorganic new materials. Due to its small particle size, it has large specific surface area, strong surface adsorption, large surface energy, high chemical purity, good dispersion performance, thermal resistance, resistance and other special properties. With its superior stability, reinforcement, thickening and thixotropy, it has unique characteristics in many disciplines and fields and plays an irreplaceable role. Nano silica, commonly known as "ultra-fine white carbon black", is widely used in various industries as additives, catalyst carriers, petrochemical industry, decolorizing agents, matting agents, rubber reinforcing agents, plastic fillers, ink thickeners, metal soft polishing agents, insulation fillers, advanced daily cosmetics fillers and spraying materials, medicine, environmental protection and other fields. It also provides new material basis and technical guarantee for the development of relevant industrial fields.

Chemical vapor deposition (CAV) method, also known as pyrolysis method, dry method or combustion method. Its raw materials are generally silicon tetrachloride, oxygen (or air) and hydrogen, which are formed by reaction at high temperature. The reaction formula is: sicl4+2h2+o2->sio2+4hcl. The air and hydrogen are respectively sent to the synthetic hydrolysis furnace after pressurization, separation, cooling and dehydration, silica gel drying, dust removal and filtration. The silicon tetrachloride raw material is sent to the rectification tower for rectification, heated and evaporated in the evaporator, and sent to the synthetic hydrolysis furnace with the dried and filtered air as the carrier. After silicon tetrachloride is gasified at high temperature (flame temperature 1000~1800 ℃), it is hydrolyzed with a certain amount of hydrogen and oxygen (or air) at a high temperature of about 1800 ℃; At this time, the generated fumed silica particles are very fine and form aerosols with the gas, which is difficult to capture. Therefore, it is first aggregated into larger particles in the aggregator, then collected by the cyclone separator, and then sent to the deacidification furnace. The fumed silica is purged with nitrogen-containing air to a pH value of 4~6, which is the finished product.

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