Material Analysis
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Weather resistance of modified styrene-butadiene copolymer not meeting standards
Problem Phenomenon
The weather resistance of modified styrene-butadiene copolymer does not meet standards; after outdoor use, yellowing, embrittlement or obvious performance decline occurs
Cause Analysis
No ultraviolet absorber is added or the addition amount is insufficient
The antioxidant system is imperfect
The ultraviolet absorber has poor compatibility with styrene-butadiene copolymer
Antioxidants are consumed and degraded during processing
Formulation design is unreasonable
Solution
Add an appropriate amount of ultraviolet absorber (0.2-0.5%)
Improve the antioxidant system with primary/auxiliary antioxidant combination
Select UV absorbers with good compatibility
Avoid high-temperature degradation of antioxidants during processing
Optimize formulation design
Key Takeaway
Weather resistance needs to be addressed from UV absorbers and antioxidants
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