Continuous mixing of silica loaded elastomeric compounds

Details Continuous mixing of silica loaded elastomeric compounds Continuous mixing of silica loaded elastomeric compounds

C - Chemistry, Metallurgy

08

J

C08J 3/20 (2006.01) B29B 7/00 (2006.01) B29B 7/46 (2006.01) B29C 47/10 (2006.01) B29C 47/40 (2006.01) B29C 67/24 (2006.01) C08K 3/36 (2006.01)

Patent

CA 2168282

A method of making silica loaded elastomer masterbatches or compounded productive elastomer stocks with or without the simultaneous extrusion of component profiles is provided. A twin-screw extruder is used to mix the elastomeric stock in multiple mixing zones at controlled temperatures in which a concurrent chemical reaction takes place between the silica coupler, the silica, and/or the diene based elastomer. Silica, elastomer, silica coupler, and other ingredients are fed into the twin screw extruder continuously through precise loss-in- weight or volumetric feeders. Chemical reactions(s) in the elastomer/silica based composition take place within the twin-screw extruder while the composition is mixing. The product is forced through a profile die mounted at the exit of the extruder and formed into the shape of the desired component. The maximum rate of mixing tends to be a function of the heat transfer efficiency, the conveying capacity of the screws, and the mechanical strength of the extruder.

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