A continuous process for the production of moisture-cure,...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/08 (2006.01) B29C 47/40 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01)

Patent

CA 2710918

A process for continuous manufacturing of moisture-curable polyurethane formulations used as sealants and adhe-sives. The process is characterized by the fact that the reactive components are introduced independently, and without the need for a prepolymer, to a mixer. Solid or liquid raw materials can be either pre- blended or fed directly to the mixer, a twin-screw extruder, which provides the requisite energy to homogenously mix the raw materials and drive the chemical reaction. The process is designed so that the extruder barrel and screw allow variable feed addition and heat exchange down the length of the machine. This allows various operations to be performed at different points in the extruder, including reaction, dispersive mixing, distributive mixing and devolitization.

L'invention concerne un procédé de fabrication continue de formulations de polyuréthane durcissables à l'humidité utilisées comme matériaux d'étanchéité et adhésifs. Le procédé se caractérise par le fait que les composants réactifs sont introduits dans un mélangeur indépendamment, sans nécessité d'employer un prépolymère. Les matières premières solides ou liquides peuvent être prémélangées ou directement introduites dans le mélangeur, une extrudeuse à double vis, qui fournit l'énergie requise pour mélanger de façon homogène les matières premières et provoquer la réaction chimique. Le procédé est conçu pour que le fût et la vis de l'extrudeuse permettent une addition d'alimentation et un échange de chaleur variables le long de la machine. Ce dispositif permet de procéder aux diverses opérations en différents points dans l'extrudeuse, en particulier la réaction, le mélange dispersif, le mélange distributif et le dégazage.

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