One, the silica gel soaked with cobalt chloride solution and then drying and activation, can let the silicon rubber color. Use it as a desiccant, water front is blue, red water, from the color change can be seen that the degree of water absorption, as well as the need for regeneration treatment. Silicone rubber is also widely used in steam recovery, oil refining and catalyst preparation etc..
Two, the silicon rubber is porous material by silica gel mSiO2 nH2O appropriate dehydration into different particle size. To have an open and porous structure, specific surface (the surface area per unit mass) is very big, can adsorb many substances, is a good desiccant, adsorbent and catalyst carrier.
Three, the adsorption effect of silicone rubber is mainly physical adsorption, can be recycled and used repeatedly. In the alkali metal silicate (such as sodium silicate) solution with acid to acidification, electrolyte, then adding a certain quantity of mixing, which generated the silicic acid gel; or in sodium silicate solution is strong in acid or ammonium salt can also generate silicate gel. The silica gel standing for a few hours to aging, and then use hot water to wash away the soluble salts, at 60 to 70 DEG C to about 300 DEG C when dried and can be activated, silica gel.
Four, the silicon rubber is a highly active adsorbent material, belonging to the non crystalline material, its chemical formula is mSiO2 nH2O. Insoluble in water and any solvent, non-toxic and tasteless, stable chemical property, in addition to alkali, hydrofluoric acid does not interact with anything. Various types of silicone because of its different manufacturing methods and the formation of different pore structures. Silica gel chemical composition and physical structure, determines that it has many other similar materials difficult to replace features: high adsorption properties, good thermal stability, stable chemical properties, high mechanical strength etc.. Silica gel according to the aperture size is divided into: macroporous silica gel, porous silica, silica gel B, narrow pore silica gel.