AN INVESTIGATION OF UV PHOTO-DEGRADATION ON ACRYLIC POLYURETHANE VARNISH COATINGS

doi:1005-4537（2009）05-0371-05

J Chin Soc Corr Pro

2009, Vol. 29

Issue (5): 371-375 DOI: 1005-4537（2009）05-0371-05

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AN INVESTIGATION OF UV PHOTO-DEGRADATION ON ACRYLIC POLYURETHANE VARNISH COATINGS

HU Jianwen^1;2; GAO Jin¹; LI Xiaogang¹; DU Cuinv¹

1. Corrosion and Protection Center; Materials Science and Engineering School; University of Science and Technology Beijing; Beijing 100083
2. Materials Science and Engineering School; Hebei University of Science and Technology; Shijiazhuang 050054

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Abstract

Acrylic polyurethane varnish coatings were exposed to artificial weathering test (UVB radiation/condensation) for different periods of time. The changes of properties and barrier protection property were monitored by adhesion tester, glossmeter, spectrophotometer, Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The results showed that the adhesion strength and low frequency impedance |Z|_f at a fixed frequency from EIS spectra decreased, while gloss loss and yellow index increased with increasing aging time. FTIR results showed that the increase of adhesion strength or |Z|_f at 12 days exposure may be attributed to the re-association of scission molecular segments. The low frequency impedance of intact coatings for different exposure time correlated with other physical and chemical properties.

Key words: acrylic polyurethane varnish UV photo-degradation FTIR artificial weathering test EIS

Received: 23 November 2007

ZTFLH:

TG174

Corresponding Authors: HU Jianwen E-mail: hujianw@sina.com

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Cite this article:

HU Jianwen GAO Jin LI Xiaogang DU Cuinv. AN INVESTIGATION OF UV PHOTO-DEGRADATION ON ACRYLIC POLYURETHANE VARNISH COATINGS. J Chin Soc Corr Pro, 2009, 29(5): 371-375.

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https://www.jcscp.org/EN/1005-4537（2009）05-0371-05 OR https://www.jcscp.org/EN/Y2009/V29/I5/371

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