Material Analysis
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Insufficient Weather Resistance/Yellowing of Cast Polypropylene Film ASA Products
Problembeschreibung
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.
Ursachenanalyse
(1) The weather resistance of the ASA grade is insufficient, and the acrylate rubber content is low
(2) The processing temperature of cast polypropylene film is too high, and partial degradation of the material affects weather resistance
(3) The surface treatment of cast polypropylene film products is improper, and ultraviolet rays directly irradiate them
(4) The amount of anti-ultraviolet agent is insufficient
(5) The regrind ratio of cast polypropylene film is too high, and the weather resistance decreases
Lösung
(1) For cast polypropylene film, select an ASA grade with good weather resistance
(2) For cast polypropylene film, control the processing temperature within the range of 230-270°C
(3) Coat the surface of cast polypropylene film products with a UV protective coating
(4) Add an appropriate amount of ultraviolet absorber to cast polypropylene film
(5) For cast polypropylene film, control the regrind ratio to not exceed 10%
Wichtigste Erkenntnis
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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