The role of boron-based additives in exterior wood coatings

1999 ◽  
Vol 82 (3) ◽  
pp. 124-126 ◽  
Author(s):  
M W Schoeman ◽  
J D Lloyd
Keyword(s):  
Wood Coatings ◽  
Exterior Wood

scholarly journals Influence of moisture content on the contact angle and surface tension measured on birch wood surfaces

2021 ◽  
Author(s):  
Rami Benkreif ◽  
Fatima Zohra Brahmia ◽  
Csilla Csiha
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Moisture Content ◽  
Solid Wood ◽  
Contact Angles ◽  
Surface Moisture ◽  
Wood Coatings ◽  
The Relationship ◽  
Wood Surfaces

AbstractSurface tension of solid wood surfaces affects the wettability and thus the adhesion of various adhesives and wood coatings. By measuring the contact angle of the wood, the surface tension can be calculated based on the Young-Dupré equation. Several publications have reported on contact angle measured with different test liquids, under different conditions. Results can only be compared if the test conditions are similar. While the roles of the drop volume, image shooting time etc., are widely recognized, the role of the wood surface moisture content (MC) is not evaluated in detail. In this study, the effect of wood moisture content on contact angle values, measured with distilled water and diiodomethane, on sanded birch (Betula pendula) surfaces was investigated, in order to find the relationship between them. With increasing MC from approximately 6% to 30%, increasing contact angle (decreasing surface tension) values were measured according to a logarithmic function. The function makes possible the calculation of contact angles that correspond to different MCs.

scholarly journals Physical, Optical, and Visual Performance of Coated Cross-Laminated Timber during Natural and Artificial Weathering

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 252
Author(s):  
Gabrielly dos Santos Bobadilha ◽  
C. Elizabeth Stokes ◽  
Katie M. Ohno ◽  
Grant Kirker ◽  
Dercilio Junior Verly Lopes ◽  
...  
Keyword(s):  
Color Change ◽  
The United States ◽  
Market Demand ◽  
Field Exposure ◽  
Visual Appearance ◽  
Artificial Weathering ◽  
Cross Laminated Timber ◽  
Wood Coatings ◽  
Coating Type ◽  
Exterior Wood

Cross-laminated timber (CLT) market demand is on the rise in the United States. Adequate protective measures have not been extensively studied. The objective of this study was to investigate the weathering performance of exterior wood coatings. We evaluated coated CLT sample surfaces based on visual appearance, color change (CIE*L*a*b), gloss changes, and water intrusion. From the five exterior wood coatings evaluated, only two showed adequate performance after twelve months field exposure. Based on visual ratings following the ASTM procedures, coating failure occurs more quickly in Mississippi than in Wisconsin, due to its greater decay zone. Both location and coating type impacted the aging of the samples. Artificial weathering results were consistent with natural weathering indicating the two adequate coatings were the most resistant to failure, color, and gloss change. For future studies, new coatings designed for the protection of end-grain in CLT panels should be a target of research and development.

Modelling film formation and degradation of semi-transparent exterior wood coatings

2007 ◽  
Vol 58 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Jan Van den Bulcke ◽  
Joris Van Acker ◽  
Hans Saveyn ◽  
Marc Stevens
Keyword(s):  
Film Formation ◽  
Wood Coatings ◽  
Exterior Wood

scholarly journals Maintenance procedures and definition of limit states for exterior wood coatings

2010 ◽  
Vol 69 (3) ◽  
pp. 443-450 ◽  
Author(s):  
Gerhard Grüll ◽  
Michael Truskaller ◽  
Laurence Podgorski ◽  
Susanne Bollmus ◽  
Florian Tscherne
Keyword(s):  
Limit States ◽  
Wood Coatings ◽  
Definition Of ◽  
Exterior Wood

scholarly journals WATER PERMEABILITY OF EXTERIOR WOOD COATINGS: WATERBORNE ACRYLATE DISPERSIONS FOR WINDOWS

2018 ◽  
Vol 13 (3) ◽  
pp. 1-16 ◽  
Author(s):  
Štěpán Hýsek ◽  
Hakan Fidan ◽  
Miloš Pánek ◽  
Martin Böhm ◽  
Kamil Trgala
Keyword(s):  
Water Vapor ◽  
Film Thickness ◽  
Water Absorption ◽  
Liquid Water ◽  
Coating Film ◽  
Water Vapor Absorption ◽  
Protective Function ◽  
Wood Coatings ◽  
Vapor Absorption ◽  
Exterior Wood

Permeability of coatings for water and water vapor is an important factor in their wood protective function. In this study, the permeability of coatings in terms of liquid water and water vapor absorption and desorption was measured based on different parts of the standard EN 927. This study evaluated the permeability of commercial coating systems and ascertained effects of coating layering on the coating permeability. For this measurement, six different waterborne acrylate dispersions were used as paint on spruce test samples. The results clearly revealed that liquid water and water vapor uptake were affected by coating film thickness, number of coats, and coating composition (producer). It was ascertained that the type of coating pigmentation affected water absorption of coatings and that with a constant coating film thickness, the number of coats affected water vapor absorption and desorption, but not water absorption. Furthermore, it was observed that the number of coats affected the correlation between the coating film thickness and water vapor absorption and desorption. The values for water vapor absorption were much higher than for liquid water absorption and, unlike the water vapor absorption rate, the water vapor desorption rate was approximately 50% lower.

scholarly journals Exterior Wood Coatings

10.5772/67170 ◽  
2017 ◽  
Author(s):  
Mojgan Nejad ◽  
Paul Cooper
Keyword(s):  
Wood Coatings ◽  
Exterior Wood
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