Material Analysis
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Insufficient Weather Resistance/Yellowing of acrylonitrile-styrene copolymer ASA Products
Fenómeno do problema
ASA products yellow, discolor, or their mechanical properties decline after outdoor use, failing to achieve the expected weather resistance effect.
ASA is known for its weather resistance.
Análise das causas
（1）The weather resistance of the ASA grade is insufficient, and the acrylate rubber content is low
（2）The acrylonitrile-styrene copolymer processing temperature is too high, and the material partially degrades, affecting the weather resistance
（3）The surface treatment of acrylonitrile-styrene copolymer products is improper, and ultraviolet rays directly irradiate
（4）The anti-ultraviolet agent dosage is insufficient
（5）The acrylonitrile-styrene copolymer regrind ratio is too high, and the weather resistance decreases
Solução
（1）acrylonitrile-styrene copolymer selects an ASA grade with good weather resistance
（2）acrylonitrile-styrene copolymer controls the processing temperature within the 200-260°C range
（3）acrylonitrile-styrene copolymer coats the product surface with a UV protective coating
（4）acrylonitrile-styrene copolymer adds an appropriate amount of ultraviolet absorber
（5）acrylonitrile-styrene copolymer controls the regrind ratio to no more than 10%
Conclusão principal
The weather resistance of ASA is related to the material grade and processing conditions, and temperature control and grade selection are the key.
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