Natural weathering of various surface coatings on five species at four european sites

Roux, M. L.; Wozniak, Edmond; Miller, E. R.; Boxall, J.; Böttcher, P.; Kropf, F. W.; Sell, J.

doi:10.1007/bf02619544

Cited by 24 publications

(9 citation statements)

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“…the coarse textured ones, showed lower performance than the fine textured species. Similar to Roux et al (1988) damage was mostly localized at the vessel lines. This is most probably a result of inner stresses in the coating near the phase boundary at large vessel lumina.…”

Section: Discussionmentioning

confidence: 81%

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

et al. 2014

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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 semitransparent 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. A minimum required exposure time for evaluation 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.

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Section: Discussionmentioning

confidence: 81%

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

et al. 2014

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“…They also indicated the coating and site had the most significant effects while species had the least. The study on the natural weathering of various surface coatings such as impregnating stain, film forming stain, pigmented acrylic latex paint, and pigmented alkyd paint carried out by Roux et al 24 Both acrylic latex and alkyd paint showed little or no damage after 2 years of weathering.…”

Section: Flaking and Crackingmentioning

confidence: 99%

Natural weathering of oak (Quercus petrae) and chestnut (Castanea sativa) coated with various finishes

et al. 2010

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Weathering performance of Oak (Quercus petrae) and Chestnut (Castanea sativa) as well as various exterior coatings were investigated. Alkyd primer þ alkyd paint and alkyd primer þ alkyd resin varnish increased the glossiness in chestnut and oak, respectively. Besides, alkyd primer and acrylic stain had little effect on the change of the glossiness for both species. However, alkyd stain significantly decreased the glossiness not only for chestnut but also oak after weathering. Acrylic stain receded the total color change (DE*) compared with the alkyd paint or stain. Alkyd-based stain showed much better performance against atmospheric conditions compared with other coatings.

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“…The equilibrium wood moisture content is not in¯uenced by the coating, but many studies on outdoor weathering of wood have shown reductions in moisture content or dimensional change if a coating is present (de Meijer et al 1998a;Roux et al 1988;Sell 1985Sell , 1982Bo Èttcher 1975;Teichgra Èber 1973). The observed reductions can be explained by the fact that the coating reduces the rate of moisture transport induced by a change in the environmental conditions like relative humidity, solar irradiation or rain.…”

Section: Introductionmentioning

confidence: 99%

Moisture transport in coated wood. Part 2: Influence of coating type, film thickness, wood species, temperature and moisture gradient on kinetics of sorption and dimensional change

Meijer

Militz

2001

Holz als Roh- und Werkstoff

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The sorption of moisture by spruce and meranti coated with both waterborne and solventborne coatings was studied during controlled conditions. Experimental variables included: coating ®lm thickness, temperature and gradients in relative humidity (33±98, 65±98 or 33±75%), or exposure to liquid water. Changes in moisture content of the wood and the tangential or the radial dimensions were recorded as a function of time. Apparent moisture diffusion coef®cients were calculated from the initial slope of the fractional weight increase following Fick's second law for unsteady state conditions. The apparent moisture diffusion coef®cients were clearly in¯uenced by both coating and wood species. The fastest moisture adsorption was observed for uncoated spruce which could be explained by the rapid capillary uptake of water. Moisture diffusion in coated samples of spruce or with coated or uncoated meranti was much lower. With the exception of liquid water, moisture diffusion during desorption was faster than during adsorption. The measured moisture diffusion coef®cients should be considered as apparent because they were dependent on the initial and ®nal moisture content. Moisture diffusion was found to be strongly dependent on temperature with activation energies between 55±76 kJ mol )1 . The rate of dimensional change was described by a two-parameter asymptotic regression model that included one constant for the rate of dimensional change and an asymptotic constant given by the dimensions at equilibrium wood moisture content as an asymptote. The differences in rate constant were inuenced by the same factors as those for moisture diffusion. The correlation between rate constant and moisture diffusion coef®cient was good except for very high moisture diffusion coef®cients that were controlled by capillary water uptake.

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Natural weathering of various surface coatings on five species at four european sites

Cited by 24 publications

References 0 publications

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

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

Natural weathering of oak (Quercus petrae) and chestnut (Castanea sativa) coated with various finishes

Moisture transport in coated wood. Part 2: Influence of coating type, film thickness, wood species, temperature and moisture gradient on kinetics of sorption and dimensional change

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