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Silica gel is?

Writer:Hong YeSource:www.szrl.net Date:2013-04-24

H2SI03 person non-toxic desiccant is used, the plastic is a highly active adsorption material is amorphous material, its chemical formula mSiO2 · nH2O was. Insoluble in water and any solvent, non-toxic, tasteless, chemically stable, in addition to alkali, hydrofluoric acid does not react with any substance. Various types of silica manufacturing methods and the formation of different porous structure. The chemical composition and physical structure of the silica gel, it difficult to replace a number of other similar materials have characteristics: high adsorption properties, thermal stability, chemical stability, high mechanical strength.

Silica gel according to the size of its aperture is divided into: macroporous silica gel, wide pore silica gel, B-type silica gel pores of silica gel. Due to the different pore structure, and therefore their adsorption properties have their own characteristics. Coarse silica gel under high relative humidity, high adsorption capacity, pore silica gel adsorption capacity in the case of low relative humidity above the coarse silica gel, B type silica gel between the coarse pore structure, pore silicone between the adsorption capacity between coarse pores between. Macroporous silica gel is generally used as a catalyst carrier, matting agent and toothpaste abrasive. Should therefore be selected according to different purposes of different varieties.

Silica gel adsorption of water exposure, burning roasted, dried, and methods such as regeneration.

[Safety performance]
Silicone main component is silicon dioxide, chemically stable, non-toxic.
Silica gel has a strong adsorption capacity, can produce dry human skin. If the silicone into the eyes need to use plenty of water and seek medical treatment.
Blue silicone because it contains a small amount of cobalt chloride, toxic, and should be avoided and food contact and inhalation of the mouth, such as the occurrence of poisoning should immediately seek medical treatment.

[Main purpose]
Characteristics of silica gel adsorption strength quickly and effectively absorb moisture within the sealed package, chemically stable, non-toxic harmless; combined in recent years, continuous innovation and development, all kinds of silicone has been used in drug purification, DNA separation, food dry, high-precision electronics, cosmetics, waste water purification, purification of beer, and advanced coatings and resin production or preservation of other aspects. In our daily life and production and business activities, silica is often used in the following areas:

Precision optical instruments, electrical and electronic dry mold packaging;
Drying of leather, such as leather, leather bags, shoes play a role in the drying shelf life;
Food drying, more common in order to ensure food crunchy biscuits and fried foods;
Drug drying, put in vials, to ensure that the drugs to extend the shelf life;
Dry container: the transport of containers at different latitudes will form the box "within the rain, if you are using a silica gel desiccant, it can absorb the equivalent of its own weight of water, ocean shipping up to 50 days, you can effectively reduces the dew point of leaving the container of the condensate phenomenon under control.
Hotel to use the class of goods, such as placed in the closet, shoes, and under the bed, the adsorption of a variety of odor, keep the air dry and fresh.

Beer silica gel
Properties:
Beer silica gel is an amorphous microporous structure of the solid powder, the pore size of 8-16nm, the chemical formula for mSiO2 · nH2O was insoluble in water and any solvent except the caustic alkali and hydrofluoric acid, not with any acid alkali, salt from the reaction, non-toxic, tasteless, no burning, no explosion, with a strong heat, cold stability, not harmful to humans. Mainly used in the beer industry.

Functions:
Beer silica gel with a large surface area and numerous suitable porous structure may cause beer turbid protein adsorption in a few minutes, removed by filtration, thus prolonging beer storage period of 180-240 days, to prevent beer from being cold muddy.
(2) does not affect the beer foam and flavor. The physicochemical properties of beer silica gel its beer foam and flavor has no effect on the practice that beer silica gel is recognized by the world beer industry the safest beer stabilizer.
(3) to improve the effect of filter aids. Beer silica gel chemically stable, excluding beer solubles, its surface area and porous structure are much better than the diatomaceous earth, good drainage aids, auxiliary diatomaceous earth filter, making beer brighter and more clear.


Blue silicone
Properties:
Blue silicone into the blue gel indicator, silica gel blue gel, the appearance of blue or light blue glass-like particles, the particle shape can be divided into two kinds of spherical and massive, with the role of the silica gel adsorption moisture, and can with increasing moisture content, its own color from blue became purple, and finally become light red, not only indicates the humidity of the environment, but also visualize whether there is still a moisture-proof effect.

Purposes:
(1) is mainly used for equipment, instruments, equipment, etc. to absorb moisture in confined conditions, anti-rust.
2 used in conjunction with ordinary silica gel desiccant, indicating desiccant to absorb moisture and judgment of the relative humidity of the environment. Packed with silica gel desiccant, widely used in precision instruments, leather, clothing, food, medicines and household appliances.

Silica sol
Properties:
The silica sol is a colloidal solution, odorless, non-toxic formula can be expressed as mSiO2nH2O.
Fine colloidal particles (10 - 20nm), there is a large specific surface area, particle itself is colorless and transparent, and does not affect the true qualities of the materials to be covered.
Low viscosity, can penetrate where water can penetrate the dispersion and permeability are very good when mixed with other substances.
Water evaporation when the silica sol, the colloidal particles firmly attached to the surface, the particles form a silicon-oxygen combination is a good adhesive.

Purposes:
One used for a variety of refractory binder, with a strong adhesive, high temperature (1500-1600 ° C), and so on.
(2) for the coatings industry, make the paint solid, but also stain-resistant dustproof, anti-aging, fire and other functions.
Used in precision casting of thin, increase the cover strength, finish casting. Its shape better than the quality of water glass shape, instead of the TEOS modeling to reduce costs and improve operating conditions.
(4) silica sol have higher specific surface area can be used for the manufacture of catalyst and catalyst support.
(5) for the paper industry, can be used as the cellophane anti-adhesive, pre-treatment agent in the photographic paper, cement bags non-slip agent.
6. Used as a sizing agent of the textile industry, and oil and processing wool, rabbit hair spinnability, reduce breakage and prevent fly, increase yield, increase economic efficiency.
7 as a silicon steel processing agent, CRT dispersant, floor wax sliding

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Keywords for the information:silicone rubber  Free technical support 

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