Extrusion & Post
9 Aufrufe
EVOH blend delamination with incompatible resin
Problembeschreibung
EVOH blended with polar resins such as PA/ABS, extrudate completely delaminated with extremely poor mechanics
Ursachenanalyse
Large polarity difference between EVOH and polar resins, zero compatibility, extremely low interfacial adhesion, no compatibilizer used
Lösung
1) Use EVOH grafted compatibilizer EVOH-g-MAH 2-5wt%; 2) Add epoxy-type compatibilizer 1-2wt%; 3) EVOH addition <10wt% to keep the other resin as the continuous phase; 4) Twin-screw high-shear blending to disperse EVOH <0.3μm
Wichtigste Erkenntnis
Blends with large polarity differences require reactive compatibilizers forming chemical bonds at the interface to solve
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!