Material Analysis
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Insufficient weather resistance/yellowing of styrene-acrylonitrile copolymer ASA products
Problem Phenomenon
ASA products show yellowing, discoloration or mechanical property decline after outdoor use, failing to achieve the expected weather resistance effect.
ASA is known for its weather resistance.
Cause Analysis
(1) The ASA grade has insufficient weather resistance and low acrylate rubber content
(2) Styrene-acrylonitrile copolymer processing temperature is too high, and partial material degradation affects weather resistance
(3) Styrene-acrylonitrile copolymer product surface treatment is improper, with direct ultraviolet irradiation
(4) Insufficient anti-ultraviolet agent dosage
(5) Styrene-acrylonitrile copolymer regrind proportion is too high, and weather resistance declines
Solution
(1) For styrene-acrylonitrile copolymer, select ASA grades with good weather resistance
(2) For styrene-acrylonitrile copolymer, control processing temperature within the 200-260°C range
(3) Coat styrene-acrylonitrile copolymer product surfaces with UV protective coatings
(4) Add an appropriate amount of ultraviolet absorber to styrene-acrylonitrile copolymer
(5) For styrene-acrylonitrile copolymer, control the regrind proportion to no more than 10%
Key Takeaway
ASA weather resistance is related to material grade and processing conditions; temperature control and grade selection are key.
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