Dynasylan® SILBOND® Condensed

• 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 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.
• Partial hydrolysis gives hydrolysates of Dynasylan® SILBOND® Condensed whose shelf-life depends on the amount of water and solvent used.
• The amount of water determines the activity of the hydrolysate.
• Activity and shelf-life are inversely proportional.
• The correct choice for the amount of water can give hydrolysates, which have a shelf-life of up to a year (from the time of manufacture).

Dynasylan® SILBOND® Condensed could be available in pails, drums, totes, and tanker quantities.