Extrusion & Post
13 visualizações
EVOH blend delamination with incompatible resin
Fenómeno do problema
EVOH blended with polar resins such as PA/ABS, extrudate completely delaminated with extremely poor mechanics
Análise das causas
Large polarity difference between EVOH and polar resins, zero compatibility, extremely low interfacial adhesion, no compatibilizer used
Solução
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
Conclusão principal
Blends with large polarity differences require reactive compatibilizers forming chemical bonds at the interface to solve
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!