Product

Dynasylan SILBOND Condensed

Tetraethyl orthosilicate

Dynasylan SILBOND Condensed - Description

Dynasylan SILBOND Condensed is a clear, low-viscosity liquid with a minimum silica content of 28.0% (the Si content of Dynasylan SILBOND Condensed is calculated as SiO2).

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Features

Dynasylan SILBOND Condensed is immiscible with water, so hydrolysis requires the use of a co-solvent such as ethanol. Suitable catalysts are mineral acids or ammonia, or even acetic acid and amines.

Dynasylan SILBOND Condensed is tetraethyl orthosilicate (TEOS; Si[OEt]4), and is used as a raw material for acid- or alkali- catalyzed hydrolysis and subsequent condensation reactions, commonly known as the sol-gel process. The gelation rate is dependent upon the concentration of water and the pH.

Applications

Dynasylan SILBOND Condensed is a ready source of silicic acid for many applications. Silicic acid is usually obtained by hydrolysis, or thermally by condensation at elevated temperatures. The resulting silicic acid bonds well to many inorganic substrates and can be deposited in-situ in a controlled manner. The surfaces of glass, metals, pigments, fillers, and synthetic fibers can be coated withy a very thin SiO2 layer in order to improve chemical and thermal stability, and mechanical properties.

Other applications are:

Binders for fillers in inorganic zinc-rich paints or precision investment castings
Crosslinkers in silicone rubber systems
Drying agents in sealing compositions

Dynasylan SILBOND Condensed is an important starting material for sol-gel processes, where the additional use of alkylalokoxysilanes (e.g. Dynasylan MTES) can give the siloxane network a slight organic character as a result of the incorporation of alkyl groups.

It is also possible to construct an inorganic/organic network by adding silanes containing organofunctional groups (e.g. aminopropyl groups) and polymerizing with organic precursors. This principle makes it possible to obtain highly scratch- and abrasion-resistant coatings.

Dynasylan SILBOND Condensed

Dynasylan SILBOND Condensed - Description

More information about Dynasylan SILBOND Condensed

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