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EVA and HDPE blend delamination

Fenómeno do problema

In EVA/HDPE cross-section, EVA concentrates in the inner layer

Análise das causas

Large viscosity difference; low-viscosity EVA migrates toward the pipe wall

Solução

1) VA15-18% EVA with viscosity closer to HDPE; 2) Blending at 170-185°C to enhance compatibility; 3) EVA-g-MAH 1-2wt%

Conclusão principal

EVA/HDPE delamination is driven by viscosity difference; viscosity matching and compatibilizer are key

EVA/HDPE delamination viscosity difference VA content compatibilizer

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