Production & Quality
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POE products yellowing after processing
Problem Phenomenon
One week after storage, the surface of POE products gradually yellows, color difference ΔE>3
Cause Analysis
Incomplete antioxidant system, thermo-oxidative degradation produces yellow products; ultraviolet irradiation accelerates photo-oxidation; residual transition metal catalysts catalyze oxidation
Solution
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
Key Takeaway
Yellowing is caused by thermal/photo oxidation and metal catalysis; improving the antioxidant system and UV absorber is the key
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