Tetraethoxysilane ( also called orthosilicic acid esters) most commonly used as starting materials for sol-gel. Polysilicic acidesters are condensation products obtained by incomplete hydrolysis or orthosilicic acid esters. They are also be used as starting materials for the sol-gel process. Tetraethoxysilane typical application: Be hydrolyzed to form silicon dioxide (silica). Crosslinkers in silicone rubber systems
Drying agents in sealing compositions
Inorganic binder for refractory fillers and pigments
Coating material for pigments, fibers and other surfaces

Chemical intermediate

Operation  Instruction  of  IBC ：

Inner layer: 4-fluoroethylene drum, 250 kg volume 220kg net weight, and other Argon Protective Layers

Middle layer: 6-7 layers of foam for earthquake Prevention

Outer layer : Fixation of steel frame or hard plastic shell and bottom silica gel protection

Tetraethoxysilane, formally named Tetraethyl orthosilicate and abbreviated TEOS, is the chemical compound with the formula Si(OC2H5)4. TEOS is a colorless liquid that degrades in water. TEOS is the ethyl ester of orthosilicic acid, Si(OH)4. It is the most prevalent alkoxide of silicon.
TEOS is a tetrahedral molecule. Like its many analogues, it is prepared by alcoholysis of silicon tetrachloride:
SiCl4 + 4 EtOH → Si(OEt)4 + 4 HCl
where Et is the ethyl group, C2H5, and thus EtOH is ethanol.
Tetraethoxysilane Applications
TEOS is mainly used as a crosslinking agent in silicone polymers and as a precursor to silicon dioxide in the semiconductor industry. TEOS is also used as the silica source for synthesis of some zeolites. Other applications include coatings for carpets and other objects. TEOS is used in the production of aerogel. These applications exploit the reactivity of the Si-OR bonds. TEOS has historically been used as an additive to alcohol based rocket fuels to decrease the heat flux to the chamber wall of regeneratively cooled engines by over 50%.
Tetraethoxysilane Other reactions
TEOS easily converts to silicon dioxide upon the addition of water:
Si(OC2H5)4 + 2 H2O → SiO2 + 4 C2H5OH
An idealized equation is shown, in reality the silica produced is hydrated. This hydrolysis reaction is an example of a sol-gel process. The side product is ethanol. The reaction proceeds via a series of condensation reactions that convert the TEOS molecule into a mineral-like solid via the formation of Si-O-Si linkages. Rates of this conversion are sensitive to the presence of acids and bases, both of which serve as catalysts. The St?ber process allows the formation of monodisperse and mesoporous silica.
At elevated temperatures (>600 °C), TEOS converts to silicon dioxide:
Si(OC2H5)4 → SiO2 + 2 (C2H5)2O
The volatile coproduct is diethyl ether.
Tetraethoxysilane Safety
TEOS has low toxicity by ingestion. While tetramethoxysilane is highly damaging to eyes since it deposits silica, TEOS is much less so due to lower hydrolysis rate of the ethoxy groups.