Material Analysis
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Insufficient Weather Resistance/Yellowing of Biaxially Oriented Polypropylene Film ASA Products
Fenómeno do problema
ASA products show yellowing, discoloration, or a decline in mechanical properties 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 processing temperature of ABS-type variant is too high, and partial degradation of the material affects weather resistance
(3) The surface treatment of ABS-type variant products is improper, and ultraviolet rays directly irradiate them
(4) The amount of anti-ultraviolet agent is insufficient
(5) The regrind ratio of ABS-type variant is too high, and the weather resistance decreases
Solução
(1) For ABS-type variant, select an ASA grade with good weather resistance
(2) For ABS-type variant, control the processing temperature within the range of 220-260°C
(3) Coat the surface of ABS-type variant products with a UV protective coating
(4) Add an appropriate amount of ultraviolet absorber to ABS-type variant
(5) For ABS-type variant, control the regrind ratio to not exceed 10%
Conclusão principal
The weather resistance of ASA is related to the material grade and processing conditions; temperature control and grade selection are the key.
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