Extrusion & Post
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Delamination in PU Blending with Incompatible Resins
Problem Phenomenon
PU blended with polar resins such as PA/ABS, extrudate completely delaminated, mechanical properties extremely poor
Cause Analysis
PU and polar resins have large polarity difference, compatibility zero, interfacial adhesion extremely low, no compatibilizer used
Solution
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
Key Takeaway
Blends with large polarity difference require reactive compatibilizer to form chemical bonding at the interface to solve it
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