Extrusion & Post
11 مشاهدة
Delamination in PU Blending with Incompatible Resins
ظاهرة المشكلة
PU blended with polar resins such as PA/ABS, extrudate completely delaminated, mechanical properties extremely poor
تحليل الأسباب
PU and polar resins have large polarity difference, compatibility zero, interfacial adhesion extremely low, no compatibilizer used
الحل
1) Use PU graft compatibilizer PU-g-MAH 2-5wt%; 2) Add epoxy-type compatibilizer 1-2wt%; 3) PU addition <10wt% to keep the other resin as the continuous phase; 4) Twin-screw high-shear blending to disperse PU <0.3μm
الخلاصة الأساسية
Blends with large polarity difference require reactive compatibilizer to form chemical bonding at the interface to solve it
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