Dynasylan® SILBOND® 50 is a clear, low-viscosity liquid that is one of the most concentrated forms of available silica, ranging from 45.0% to 47.0% (the Si content of Dynasylan® SILBOND® 50 is calculated as SiO₂).
Dynasylan® SILBOND® 50 is an ethyl polysilicate that is the partially hydrolyzed product of tetraethyl orthosilicate (TEOS). The partial hydrolysis of TEOS (Si[OEt]4) results in the conversion of ethoxy groups to hydroxyl groups forming silanols. Subsequent condensation of silanols will form siloxane bonds (-Si-O-Si-O-) and eventually cause the material to gel.
Dynasylan® SILBOND® 50 is often used as an intermediate, which is further hydrolyzed to produce a binder that can be used for many applications. This binder is used for inorganic zinc-rich primers, investment casting molds, cores and ceramic shapes, and coatings.
Typical Applications
Other applications are:
- binder, especially for inorganic zinc-rich coatings or precision investment castings
- encapsulant for hydroxyl poor fillers to enhance adhesion with functional silanes
- crosslinker component in cold-curing silicone rubber systems
- coupling agent/adhesion promoter between organic polymers and inorganic substrates (fillers, pigments, glass, metals surfaces, etc.)
Dynasylan® SILBOND® 50 can also used as starting material for sol-gel processes. It is usually used in conjunction with alkylsilanes (e.g. Dynasylan® MTES) organofunctional silanes and/or organic precursors (e.g. organic resins) to form siloxane networks. This makes it possible to obtain highly scratch-, abrasion-, and chemical-resistant coatings.
Dynasylan® SILBOND® 50 is immiscible with water, therefore hydrolysis requires a cosolvent as a solubilizer. Mineral acids and ammonia are suitable as catalysts.
Dynasylan® SILBOND® 50 or its hydrolysates are also the binder component for 1- and 2-pack inorganic zinc-rich coatings, for corrosion protection on steel, and for slurries used in precision investment castings.
Product Details
Technical Data Sheets
Further Information
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