METHOD FOR THE PRODUCTION OF A RUBBER COMPOSITION AT HIGH TEMPERATURE

摘要

The invention relates to a method for the production of a starting rubber composition, during which the following steps are carried out sequentially: (a) a rubber matrix, reinforcing fillers and, optionally, other components, with the exception of the cross-linking system, are introduced into an internal-mixer-type mixing means (100) of the type comprising a mixing tank (116) in which rotors (112, 113) are mounted, rotated and equipped with radial projections, with an air gap (e) being formed between said projections and the tank; (b) the aforementioned components are mixed in the tank until a homogeneous mixture is obtained, ensuring that the temperature of the mixture remains below or equal to 170°C; (c) the rotational speed of the rotors is adjusted such as to bring the rubber composition to a drop temperature of between 180°C and 240°C in less than 600 seconds, and preferably less than 400 seconds; and (d) once the drop temperature has been reached, the starting rubber composition is removed from the internal mixer and the temperature of said composition is lowered to a temperature below 140°C in less than 5 minutes.