| Silica gel is a kind of highly active adsorption material, which is an amorphous substance, and its chemical formula is mSiO2 and nH2O. Insoluble in water and any solvent, non-toxic and tasteless, stable chemical property, except alkali, hydrofluoric acid, and not with any of the material reaction. Various types of silica gel formed different microporous structures due to different manufacturing methods. The chemical composition and physical structure of the silica gel determined that it has many other similar materials, such as high adsorption capacity, good thermal stability, stable chemical property, high mechanical strength and so on. According to the silica gel pore size divided into big pore silica gel, porous silica, silica gel, silica gel pore type B. Due to the different pore structure, the adsorption performance of them is different. Coarse pore silica gel under high relative humidity has a higher adsorption capacity, fine pored silica gel is under low relative humidity adsorption capacity is higher than that of the coarse pore silica gel, and type B silica gel due to the pore structure between coarse and fine pored silica gel, the adsorption capacity between coarse, pore. Macroporous silica gel is generally used as catalyst carrier, extinction agent, toothpaste abrasive, and so on. Therefore, different varieties should be selected according to different uses. Silica gel after absorption of water can be regenerated by exposure, baking, drying and other methods. The main composition of the silica gel is silicon dioxide, stable chemical properties, non-toxic. Silica gel has a strong adsorption capacity, the human skin can produce a drying effect. If the silicone into the eyes, a large amount of water to wash, and as soon as possible to find a doctor. Blue silicone due to contain a small amount of cobalt chloride, toxic, should avoid contact with food and inhalation, such as the occurrence of poisoning cases should immediately seek medical treatment. [application] using silica gel has strong adsorption can quickly and effectively adsorption sealing characteristics of packaging in the water, chemical stability, non-toxic and harmless; coupled with continuously in recent years of innovation and development, all kinds of silicone rubber has been widely used in drug purification, DNA isolation, dry food, high precision electronics, senior cosmetics, sewage purification, purification of beer, advanced coatings and resin production or preservation. In our daily life and production activities, silica gel is often used in the following aspects: precision optical instruments, electronic appliances dry mouldproof packaging; leather hand drying, such as leather, leather bags, leather shoes placed on the inside to guarantee drying effect; food drying in on the biscuit and fried foods. In order to ensure food crisp; drug dry, put in the bottle, to ensure drug and prolong the shelf life; container drying: transport containers in different latitudes will form the box "in the rain", if you use silica gel desiccant, it can absorb the equivalent weight of water, up to 50 days for ocean transportation process that can effectively reduce the dew point of condensate water container control phenomenon. For goods such as hotel, placed in the closet, and shoes under the bed, adsorption odor, keep the air fresh and dry. |
