Method for Reducing the Chlorine Content of Alpha Series Silane Coupling Agents
Trace amounts of dichloromethyltriethoxysilane in dichloromethyltriethoxysilane react slowly with amines,resulting in slow release of chlorine elements after production,leading to excessive chlorine content in the coupling agent.Neutralizing the crude product of dichloromethyltriethoxysilane with magnesium and adding a small amount of sodium ethanol can completely destroy the trace amount of dichloromethyltriethoxysilane.The salt produced during the amination process will wrap the raw materials,causing incomplete reaction of the materials.Storing the filtered materials for a certain period of time can make the reaction proceed more thoroughly.The total chlorine content in the final product after two-step processing can be reduced to within 50×10-6mg/L.
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