Silica gel is a highly active adsorbent material, which is an amorphous substance, and its chemical formula is mSiO2·nH2O. It is insoluble in water and any solvent, non-toxic and odorless, chemically stable, and does not react with any substance except strong alkali and hydrofluoric acid. Various types of silica gel have different microporous structures due to different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many characteristics that other similar materials are difficult to replace: high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength.
Silica gel is divided into: large-pore silica gel, coarse-pore silica gel, B-type silica gel, fine-pore silica gel according to its pore size. Due to the different pore structures, their adsorption properties have their own characteristics. Coarse pore silica gel has a higher adsorption capacity when the relative humidity is high, and fine pore silica gel has a higher adsorption capacity than the coarse pore silica gel when the relative humidity is low, while the type B silica gel has a pore structure between coarse and fine pores. Between the silica gel, the adsorption capacity is also between the coarse and fine pores. Macroporous silica gel is generally used as a catalyst carrier, matting agent, toothpaste abrasive, etc. Therefore, different varieties should be selected according to different uses.
After silica gel absorbs moisture, it can be regenerated by exposure, baking, air drying and other methods.
The main component of silica gel is silica, which is chemically stable and non-toxic.
Silica gel has a strong adsorption capacity and can have a drying effect on human skin. If the silicone enters the eyes, it needs to be rinsed with plenty of water and seek medical treatment as soon as possible.
Blue silica gel is poisonous because it contains a small amount of cobalt chloride. Avoid contact with food and inhalation. If a poisoning event occurs, you should seek medical treatment immediately.
[The main purpose〕
The use of silica gel has the characteristics of strong adsorption, which can quickly and effectively absorb the moisture in the sealed package, stable chemical properties, non-toxic and harmless; coupled with continuous innovation and development in recent years, various silica gels have been widely used in drug purification, DNA separation, food Drying, high-precision electronics, advanced cosmetics, sewage purification, beer purification, advanced coatings and resin production or preservation, etc. In our daily life and production and operation activities, silica gel is often used in the following areas:
Dry mold proof packaging for precision optical instruments and electronic appliances;
For the drying of leather goods, such as placing in leather clothes, leather bags and leather shoes, it plays the role of drying and quality preservation;
In terms of food drying, it is more common in biscuits and fried foods to ensure that the food is crisp;
For the drying of medicines, put them in medicine bottles to ensure the extended shelf life of medicines;
Container drying: The shipping container will form an "internal rain" in the box at different latitudes. If you use silica gel desiccant, it can absorb water equivalent to its own weight. During the 50-day transportation to the ocean, you can Effectively reduce the dew point and control the condensation of the container.
Hotel articles, such as placed in a wardrobe, shoes and under the bed, absorb various odors and keep the air dry and fresh.