Outdoor weathering performance parameters of exterior wood coating systems on tropical hardwood substrates

Wood coating research almost exclusively focuses on softwood as substrate despite the fact that coatings applied on tropical hardwoods show a different weathering behaviour. The objective of this study was to quantify the impact of wood substrate and coating type on the weathering behaviour of finis...

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Bibliographic Details
Published in:European journal of wood and wood products 2014-03, Vol.72 (2), p.261-272
Main Authors: De Windt, Imke, Van den Bulcke, Jan, Wuijtens, Inge, Coppens, Hugo, Van Acker, Joris
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Ceramics
Coatings
Composites
Glass
hardwood
Hardwoods
Joinery
Life Sciences
Machines
Manufacturing
Natural Materials
Original
paints
Primers (coatings)
Processes
Protective coatings
softwood
Softwoods
Species
statistical analysis
Statistical methods
Substrates
Texture
Thickness
Vertical orientation
Weathering
Wood Science & Technology
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Summary:Wood coating research almost exclusively focuses on softwood as substrate despite the fact that coatings applied on tropical hardwoods show a different weathering behaviour. The objective of this study was to quantify the impact of wood substrate and coating type on the weathering behaviour of finished wooden joinery in outdoor exposure using a set of statistical methods. Therefore, a broad range of white opaque paints and mid-oak semi-transparent stains were used. The coatings were industrially applied on window frames made of frequently used commercial tropical hardwood species. The general appearance of the wood/coating systems was assessed visually using a rating scale that takes into account the anatomical characteristics of hardwood. For the evaluation, a required minimum exposure time of 2.5 years outdoor weathering for joinery in vertical position and facing south-west was determined. At 30 months best performances were recorded for waterborne alkyd primers with an acrylic topcoat when dry coating film was sufficiently thick. The dry layer thickness also affected the impact of the hiding power on the performance of the wood/coating system. Within hardwood species the degradation rate of coatings on species with a fine texture was the lowest. The significant influence of the substrate’s texture on the weathering behaviour of coated hardwood stressed the need to evaluate the wood/coating system in total.
ISSN:0018-3768
1436-736X
DOI:10.1007/s00107-014-0779-7