Extrusion & Post
10 조회수
EVOH blend delamination with incompatible resin
문제 현상
EVOH blended with polar resins such as PA/ABS, extrudate completely delaminated with extremely poor mechanics
원인 분석
Large polarity difference between EVOH and polar resins, zero compatibility, extremely low interfacial adhesion, no compatibilizer used
해결 방법
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
핵심 요약
Blends with large polarity differences require reactive compatibilizers forming chemical bonds at the interface to solve
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