| 摘要 |
The invention relates to the optimization of a method for producing a flowable thermoplastic carrier polymer with integrated additives for further processing, in particular for the cross-linking of a likewise flowable thermoplastic base polymer consisting of a compatible or identical material. In a first step, at least one foaming agent and at least one additive that only acts on the end product are simultaneously added to the compact, pore-free carrier polymer. Said heterogeneous mass is melted and foamed after having been previously mixed, and/or whilst being mixed and then re-mixed. The mass is then cooled to form pellet or granulate-type carrier polymers with a porous structure that contains the additives. In a second step, additional additives that act on the end products are preferably added during and/or after the melting process, without prior cooling, in particular silanes. The charged, porous carrier polymers obtained by said method are used to introduce additives into plastic masses, the base polymers, in particular for producing plastic pipes cross-linked with silane and jackets for wire and used during the production of films and in injection moulding and die-casting. |
