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Wettability and bonding quality of exterior coatings on jabon and sengon wood surfaces

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Abstract

Wettability and bonding quality of exterior coatings on fast-growing wood surfaces were studied. Samples of air-dried flat-grained (tangential surface) and edge-grained (radial surface) pattern of jabon (Anthocephalus cadamba) and sengon (Paraserianthes falcataria) woods were used. Before application of exterior coatings, the surfaces of the lumber samples were sanded. To provide wood surfaces with various degrees of roughness, abrasive papers of 120, 240, and 360 grits were used for the surface preparation. The wettability of two exterior coatings (water-based acrylic and oil-based alkyd varnishes) on the sanded wood surfaces was measured using a sessile drop contact angle method. The Shi and Gardner (S/G) model was used to evaluate and compare the wettability of the surface coatings on the wood. The sanded wood samples were coated with the two coatings (two layers each). Bonding quality of the coating layers was measured using a crosscut tape test method. Experimental results show that constant contact angle change rate (K value) of the S/G model decreased as the grit number of abrasive paper increased. This indicates that the wettability decreased as the roughness of the surface decreased (surface becomes smoother). There was no evidence of differences in wettability between tangential and radial wood surfaces. The oil-based alkyd coating generated better wettability compared to the water-based acrylic. The crosscut tests showed that the bonding quality of the coating films on both jabon and sengon wood decreased as the surface became smoother. The sengon wood compared to jabon wood provided better coating wettability and bonding quality. Wettability in terms of the K values was a good indication for determining the bonding quality of the two varnish layers.

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Acknowledgments

The authors thank the Directorate for Research and Community Service of the Ministry of RISTEK DIKTI (079/SP2H/LT/DRPM/II/2016) for the Republic of Indonesia for the research grant.

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Authors and Affiliations

  1. Bogor Agricultural University (IPB), Bogor, Indonesia

    Wayan Darmawan, Dodi Nandika, Evi Noviyanti & Irsan Alipraja

  2. Muhammadiyah University, Purwokerto, Indonesia

    Dumasari Lumongga

  3. University of Maine, Orono, ME, USA

    Douglas Gardner

  4. Université de Lorraine, Nancy, France

    Philippe Gérardin

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  1. Wayan Darmawan
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  2. Dodi Nandika
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Correspondence to Wayan Darmawan.

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Darmawan, W., Nandika, D., Noviyanti, E. et al. Wettability and bonding quality of exterior coatings on jabon and sengon wood surfaces. J Coat Technol Res 15, 95–104 (2018). https://doi.org/10.1007/s11998-017-9954-1

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