Production & Quality
9 views
PU Product Yellowing After Processing
Problem Phenomenon
PU product surface gradually yellows after 1 week of storage, color difference ΔE>3
Cause Analysis
Antioxidant system incomplete, thermo-oxidative degradation producing yellow products; UV irradiation accelerating photo-oxidation; residual transition metal catalysts catalyzing oxidation
Solution
1) Improve 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
Key Takeaway
Yellowing is caused by thermo/photo-oxidation and metal catalysis; improving antioxidant system and UV absorber is key
Was this helpful?
0 people found this helpful
Thank you for your feedback!