Material Analysis
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Poor Weather Resistance of CMC
Problem Phenomenon
After 6 months outdoors, CMC mechanical properties decrease by 40-50% and the surface cracks
Cause Analysis
Photo-oxidative degradation of the CMC polyolefin backbone breaks molecular chains; ultraviolet rays directly attack C-C bonds
Solution
1)UV-327 0.5-1wt% to absorb ultraviolet rays; 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 the key
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