Material Analysis
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Poor EVOH Weather Resistance
Problem Phenomenon
After 6 months outdoors, EVOH mechanical properties decline 40-50% with surface cracking
Cause Analysis
Photo-oxidative degradation of EVOH polyolefin backbone with molecular chain breakage; UV directly attacks C-C bonds
Solution
1) UV-327 0.5-1wt% to absorb UV; 2) HALS-770 0.2-0.5wt% for light stabilization; 3) 1010+168 antioxidant 0.3wt% to prevent oxidation
Key Takeaway
Poor weather resistance is caused by photo-oxidation; UV+HALS+antioxidant triple protection is key
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