Solar reflectance, surface adhesion, and thermal conductivity of wood/natural rubber composite sheet with Tio 2/polyurethane topcoat for roofing applications

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Author list: Hamaviriyapornwattana N., Sombatsompop N., Markpin T., Kositchaiyong A., Wimolmala E.

Publisher: Wiley

Publication year: 2012

Journal: Journal of Vinyl and Additive Technology (1083-5601)

Volume number: 18

Issue number: 3

Start page: 184

End page: 191

Number of pages: 8

ISSN: 1083-5601

eISSN: 1548-0585

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84864711660&doi=10.1002%2fvnl.20302&partnerID=40&md5=0a30f215d9ac54f5e64e3bec2638ef5a

Languages: English-Great Britain (EN-GB)

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Abstract

Effects of titanium dioxide (TiO 2) dosage in polyurethane (PU) coating and PU coating thickness on solar reflectance, surface adhesion, crack resistance to bending, and thermal conductivity of wood/(natural rubber) (WNR) composite sheet were studied before and after prolonged UV aging. The TiO 2 powder content added to the PU coating was varied from 0 to 15 parts per hundred parts of PU. The average PU coating thickness on the WNR composite sheet was altered from 127 ± 10 to 315 ± 10 μm. The experimental results suggested that the solar reflectance slightly increased with increasing TiO 2 powder but did not change upon varying the PU coating thicknesses. The presence of TiO 2 in the PU coating caused a slight decrease in thermal conductivity because of porosities occurring due to the presence of voids, but increasing the TiO 2 powder content in the coating resulted in a progressive increase in thermal conductivity of the composite sheet. In a UV-accelerated weathering tester (UVB 313 nm), the lightness of the PU coating slightly increased owing to PU discoloration, whereas the solar reflectance, PU/WNR layer adhesion, and crack resistance to bending remained unaffected with increasing UV aging time. J. VINYL ADDIT. TECHNOL., 18:184-191, 2012. © 2012 Society of Plastics Engineers Copyright © 2012 Society of Plastics Engineers.

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