Production & Quality
10 Aufrufe
CEF products yellow after processing
Problembeschreibung
CEF product surface gradually yellows after 1 week of storage, color difference ΔE>3
Ursachenanalyse
Incomplete antioxidant system, thermal oxidation degradation produces yellow products; UV exposure accelerates photo-oxidation; residual transition metal catalysts catalyze oxidation
Lösung
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
Wichtigste Erkenntnis
Yellowing is caused by thermal-photo oxidation and metal catalysis, improving the antioxidant system and UV absorber is key
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