Enhancement of the properties of acrylic wood coatings with the use of biopolymers

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.

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Synthesis and properties of star-shaped polyesters for high-solid-content two-component polyurethane wood coatings

Journal of Macromolecular Science Part A ◽

10.1080/10601325.2021.1894075 ◽

2021 ◽

pp. 1-7

Author(s):

Yanyang Gao ◽

Wanqiu Liu ◽

Liuyan Tang ◽

Yanan Zhu ◽

Jinqing Qu

Keyword(s):

Solid Content ◽

High Solid Content ◽

High Solid ◽

Wood Coatings ◽

Two Component

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

Coatings ◽

10.3390/coatings11020252 ◽

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.

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Sustainable, high-performance, flame-retardant waterborne wood coatings via phytic acid based green curing agent for melamine-urea-formaldehyde resin

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2021.106597 ◽

2022 ◽

Vol 162 ◽

pp. 106597

Author(s):

Feixiang Song ◽

Tao Liu ◽

Qi Fan ◽

Dexi Li ◽

Rongxian Ou ◽

...

Keyword(s):

Flame Retardant ◽

Phytic Acid ◽

High Performance ◽

Urea Formaldehyde ◽

Urea Formaldehyde Resin ◽

Formaldehyde Resin ◽

Curing Agent ◽

Wood Coatings

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In Situ Performance Assessment and Evaluation of Hydrophobic and Ultraviolet Protective Treatments for Historic Log Structures

The UW National Parks Service Research Station Annual Reports ◽

10.13001/uwnpsrc.2015.4105 ◽

2015 ◽

Vol 38 ◽

pp. 100-111

Author(s):

Courtney Magill ◽

Frank Matero

Keyword(s):

Field Research ◽

Accelerated Weathering ◽

Assessment And Evaluation ◽

Appropriate Treatment ◽

Wood Coatings ◽

Subsequent Phase ◽

Initial Results ◽

Ongoing Project

Beginning in the summer of 2015, research was conducted on protective wood coatings and accelerated weathering testing methods for architectural log and timber. A rack for supplementary natural weathering testing of hydrophobic and ultraviolet protective surface treatments for logs was also erected as a subsequent phase at Grand Teton National Park. This laboratory and field research is part of an ongoing project to develop an appropriate treatment for historic log structures in the region that will preserve their original fabric while maintaining the intended historic appearance of the buildings, i.e., unpainted. The weathering rack will be in place for upwards of five years to verify the lab-based results from Phase I and to determine the long-term durability of the chosen treatments on already aged materials in situ. This report addresses the methods and materials for preparation of the weathering rack and samples as well as the methods being used to monitor their progress and initial results. Readings will be taken yearly to monitor the effects of weathering on each treatment.

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