Production & Quality
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EMA Product Yellowing After Processing
Problem Phenomenon
After 1 week of storage, the surface of EMA products gradually yellows, color difference ΔE>3
Cause Analysis
Imperfect antioxidant system, thermal 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 0.2-0.5wt% UV absorber; 3) Add 0.05wt% metal deactivator; 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 are key
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