Material Analysis
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CEF UV aging fast
Fenómeno del problema
After 48h of UV irradiation, the mechanical properties of CEF decrease >20% and yellowing occurs
Análisis de la causa
The CEF molecular chain undergoes rapid photo-oxidative degradation under UV; the surface molecular chains break to form micro-cracks
Solución
1) Add UV absorber 0.3-0.5wt% to block UV; 2) Add HALS 0.2wt% for free radical capture; 3) Carbon black 2wt% to physically shield UV
Conclusión clave
Fast UV aging is caused by photo-oxidation; UV absorber and HALS are the key
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