In this paper we will describe some of the material features required to formulate a suitable thermoplastic polyolefine (TPO) slush molding composition and the important material properties necessary for molding and meeting performance requirements. Melt compounding was performed using a Theysohn Model TSK TT20 Twin Screw Laboratory Extruder. Nearly all blend compositions involved low melting point materials with relatively low melt viscosities. Slush moldable TPO compositions have been formulated to possess the required balance of low melt viscosity under the low shear rates expected during rotational molding. Low temperature ductility is imparted by suitable choice of a low Tg polyolefin elastomer that forms a dispersed phase in an essentially semi-crystalline matrix. Different elastomers can be used to change the handling characteristics of the skin, however, the composition dependent rheology of the formulations can have an adverse effect on melt viscosity. A thermodynamic analysis of miscibility in some of these blends has also been described which is used to explain experimentally observed morphological, rheological, and thermal properties of the compositions investigated and also used to indicate how appropriate materials may be selected.
Thermoplastic polyolefins (TPO) for slush molding of interior skins: materials and processing requirements
Thermoplastische Polyolefine für das Schleuderformen von Oberflächenschichten in der Innenausstattung: Werkstoffe und Verarbeitungsbedingungen
2005
23 Seiten, 18 Bilder, 3 Tabellen, 16 Quellen
Aufsatz (Konferenz)
Englisch
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