Abstract
The effectiveness of hindered amine light stabilizers in reducing carbonyl formation during ultraviolet light exposure of an acrylic melamine coating has been measured by infrared spectroscopy for both a harsh and near-ambient exposure. The four hindered amines studied are all based on 2,2,6,6 tetramethylpiperidine, and have the following substitutents on the piperidine nitrogen: H, CH 3, CH 2CH 2-polymer, and COCH 3. The inhibition of photo-oxidation provided by a given hindered amine varies with exposure condition. Harsh, accelerated tests can lead to inaccurate predictions of the performance of hindered amines in coatings exposed to sunlight. Under the near-ambient exposure used here, stabilizers based on NH and NCH 3 functionality are found to provide higher levels of inhibition, especially during the early stages of exposure, than the other stabilizers in the acrylic melamine coating studied.
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