Dynasylan® 6498 is a vinyl silane concentrate (oligomeric siloxane) containing vinyl and ethoxy groups.
Scope of Application
Dynasylan® 6498 is excellent as an adhesion promoter, dispersion and hydrophobation agent in mineral filled compounds. In the presence of moisture, the ethoxy groups of Dynasylan® 6498 hydrolyse to produce ethanol and reactive silanol groups. These silanol groups react with the filler via silicon-oxygen bridges. The vinyl functional groups of Dynasylan® 6498 react with the polymer phase in the presence of radicals: A major field of application for mineral-filled compounds is the cable industry. EPDM and EVA can be processed into highly filled cable compounds through the adhesion promoting and hydrophobising effect of Dynasylan® 6498. The EPDM and EVA polymers with Dynasylan® 6498 are for the halogen-free, non-toxic, environmentally-friendly flame retardant cable compounds (HFFR) based on ATH and MDH. In addition, Dynasylan® 6498 can be used in many other applications such as filler and pigment coating, dispersions etc. Typical property improvements obtained by using Dynasylan® 6498 in filled polymers are: improved filler dispersion good processability significantly reduced water-uptake excellent balance between tensile strength and elongation at break at a high level improved chemical resistance strongly reduced tendency to stress cracking higher impact strength higher abrasion resistance
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