Production & Quality
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DSTDP product yellowing after processing
Problembeschreibung
DSTDP product surface gradually yellows after 1 week of storage, color difference ΔE>3
Ursachenanalyse
Antioxidant system incomplete, thermo-oxidative degradation produces yellow products; ultraviolet irradiation accelerates photo-oxidation; residual transition metal catalysts catalyze 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 raw material grades with low residue
Wichtigste Erkenntnis
Yellowing is caused by thermo- and photo-oxidation and metal catalysis; completing the antioxidant system and UV absorber is key
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