Production & Quality
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Yellowing of EVA products after processing
Problembeschreibung
After 1 week of storage, EVA product surface gradually yellows with color difference ΔE>3
Ursachenanalyse
Incomplete antioxidant system with thermo-oxidative degradation producing yellow products; UV irradiation accelerating photo-oxidation; residual transition metal catalysts catalyzing oxidation
Lösung
1) Complete 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 grade
Wichtigste Erkenntnis
Yellowing is caused by thermo-photo-oxidation and metal catalysis; completing antioxidant system and UV absorber is key
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