Silane Curable Composition with Non-Tin Fast Curing Catalysts

The patent changes the chemical parameters of the catalyst system by selecting specific metal compounds (titanium, zirconium, hafnium alkoxides) and organic bases (amidine, guanidine, carbodiimide compounds) to optimize the hydrolysis and condensation reaction rates of the bifunctional dialkoxysilyl groups, thereby achieving both high mechanical properties and fast curing rate

The patent uses a composite catalyst system combining metal compounds (providing Lewis acid catalysis) and organic base compounds (providing nucleophilic catalysis) to synergistically enhance the hydrolyzability of the low-hydrolyzability organic polymer having bifunctional dialkoxysilyl groups, resolving the contradiction between maintaining mechanical properties and improving curing rate

The patent introduces metal compounds (titanium, zirconium, hafnium alkoxides) as intermediary catalysts that mediate the hydrolysis and condensation reactions of silane groups. These metal compounds provide efficient catalytic activity comparable to or exceeding organotin compounds while being less toxic, and they work synergistically with organic base compounds to achieve fast curing rates without the toxicity problems of traditional tin catalysts

The patent changes the catalytic parameters by selecting metal compounds with specific properties (Lewis acidity, alkoxide groups) that enhance their catalytic efficiency for silane hydrolysis and condensation. This parameter optimization allows non-tin catalysts to achieve curing rates that were previously only attainable with toxic organotin compounds