Material Analysis
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Insufficient Weather Resistance/Yellowing of acrylonitrile-styrene-acrylate copolymer ASA Products
Problem Phenomenon
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.
Cause Analysis
（1）The weather resistance of the ASA grade is insufficient, and the acrylate rubber content is low
（2）The acrylonitrile-styrene-acrylate copolymer processing temperature is too high, and the material partially degrades, affecting the weather resistance
（3）The surface treatment of acrylonitrile-styrene-acrylate copolymer products is improper, and ultraviolet rays directly irradiate
（4）The anti-ultraviolet agent dosage is insufficient
（5）The acrylonitrile-styrene-acrylate copolymer regrind ratio is too high, and the weather resistance decreases
Solution
（1）acrylonitrile-styrene-acrylate copolymer selects an ASA grade with good weather resistance
（2）acrylonitrile-styrene-acrylate copolymer controls the processing temperature within the 220-260°C range
（3）acrylonitrile-styrene-acrylate copolymer coats the product surface with a UV protective coating
（4）acrylonitrile-styrene-acrylate copolymer adds an appropriate amount of ultraviolet absorber
（5）acrylonitrile-styrene-acrylate copolymer controls the regrind ratio to no more than 10%
Key Takeaway
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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