Extrusion & Post
10 조회수
Delamination of PVA blended with incompatible resin
문제 현상
PVA blended with polar resins such as PA/ABS, extrudate completely delaminated, mechanical properties extremely poor
원인 분석
PVA and polar resin have large polarity difference, compatibility zero, interfacial adhesion extremely low, no compatibilizer used
해결 방법
1) Use PVA grafted compatibilizer PVA-g-MAH 2-5wt%; 2) Add epoxy-type compatibilizer 1-2wt%; 3) PVA addition <10wt% to keep the other resin as continuous phase; 4) Twin-screw high-shear blending to disperse PVA <0.3μm
핵심 요약
Blends with large polarity difference need reactive compatibilizer to form chemical bonding at the interface to solve
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