Material Analysis
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Poor PVA weather resistance
Fenómeno do problema
After 6 months outdoors, PVA mechanical properties decrease 40-50%, surface cracking
Análise das causas
PVA polyolefin backbone photo-oxidative degradation, molecular chain breakage; ultraviolet rays directly attack C-C bonds
Solução
1) UV-327 0.5-1wt% to absorb ultraviolet; 2) HALS-770 0.2-0.5wt% for light stabilization; 3) 1010+168 antioxidant 0.3wt% to prevent oxidation
Conclusão principal
Poor weather resistance is caused by photo-oxidation; UV+HALS+antioxidant triple protection is the key
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