Process for the preparation of thermally crosslinkable polymers in a planetary roller extruder

摘要

The invention relates to a process for the preparation of thermally crosslinkable polymers in a planetary roller extruder, a) the planetary roller extruder having a filling part and a compounding part, which is formed by a roll cylinder region consisting of at least two, preferably at least three coupled roll cylinders, the planetary spindles by a b) the polymers are fed to the planetary roller extruder in a plasticized state, c) the plasticized polymers are fed into the first roll cylinder, namely within the first half of the first roll cylinder, d) vacuum applied to the filling part of the planetary roller extruder e) if the roll cylinder region is formed from two roll cylinders, the shell of the second roll cylinder has an opening through which the plasticized polymers by means of vacuum of air and optionally further volatile component or if the roll cylinder region is formed from more than two roll cylinders, the jacket of the second roll cylinder of the at least three roll cylinders or the jacket of a downstream subsequent roll cylinder has an opening through which the plasticized polymers are freed from air and optionally further volatile components by means of vacuum f) the flow temperatures of the central spindle and the vacuum-standing at least two roll cylinders are set so that the polymers to be degassed remain in the plastic state, g) downstream of the degassing by vacuum the plasticized polymers one or more liquids such as thermal crosslinkers, crosslinking accelerators, Dye solutions or dye dispersions are preferably metered in continuously, ie in the second roll cylinder or in one or more of the optionally present further roll cylinders or in the intermediate rings between h) the mixture of plasticized polymers and liquids in the roll cylinder region, in which the liquids are incorporated into the plasticized polymers, are cooled in such a way that, after the mixture has exited from the I) the length of the roll cylinder region in which degassing of the plasticized polymers by means of vacuum takes place between more than 50% and 80%, preferably between 60% and 70% of the Length of the entire roll cylinder region, j) the mixture of plasticized polymers and modifying liquids is preferably supplied to a coating unit without further additional treatment, more preferably inline, that is, without intermediate filling or transfer with subsequent How deraufschmelzen.