Material Analysis
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Insufficient Weather Resistance/Yellowing of Biaxially Oriented Polypropylene Film ASA Products
Problem Phenomenon
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.
Cause Analysis
(1) The weather resistance of the ASA grade is insufficient, and the acrylate rubber content is low
(2) The processing temperature of biaxially oriented polypropylene film is too high, and partial degradation of the material affects weather resistance
(3) The surface treatment of biaxially oriented 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 biaxially oriented polypropylene film is too high, and the weather resistance decreases
Solution
(1) For biaxially oriented polypropylene film, select an ASA grade with good weather resistance
(2) For biaxially oriented polypropylene film, control the processing temperature within the range of 140-170(stretching)/230-260(extrusion)°C
(3) Coat the surface of biaxially oriented polypropylene film products with a UV protective coating
(4) Add an appropriate amount of ultraviolet absorber to biaxially oriented polypropylene film
(5) For biaxially oriented polypropylene film, control the regrind ratio to not exceed 10%
Key Takeaway
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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