Production & Quality
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MP products yellowing after processing
Fenómeno del problema
MP products gradually yellow on the surface after 1 week of storage, color difference ΔE>3
Análisis de la causa
incomplete antioxidant system, thermal oxidative degradation produces yellow products; UV irradiation accelerates photo-oxidation; residual transition metal catalysts catalyze oxidation
Solución
1) improve the antioxidant system 1010(0.1)+168(0.1)+DSTDP(0.2)wt%; 2) add UV absorber 0.2-0.5wt%; 3) add metal deactivator 0.05wt%; 4) select low-residue raw material grades
Conclusión clave
yellowing is caused by thermal/photo-oxidation and metal catalysis; improving the antioxidant system and UV absorber is key
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