Material Analysis
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EVA heat-sensitive decomposition and yellowing
Fenómeno del problema
EVA processing >200°C turns yellow and brown, releasing acetic acid odor
Análisis de la causa
VA groups decompose by deacetylation at high temperature >200°C; acetic acid release accelerates decomposition
Solución
1) Temperature 140-200°C; 2) Shorten high-temperature residence and increase rotation speed; 3) 0.2wt% zinc stearate to absorb acetic acid; 4) Low-VA EVA with VA<18%
Conclusión clave
EVA heat-sensitive decomposition is caused by VA deacetylation; temperature control is the fundamental countermeasure
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