Heat-Treated Wood as a Substrate for Coatings, Weathering of Heat-Treated Wood, and Coating Performance on Heat-Treated Wood

Jirouš-Rajković, Vlatka; Miklečić, Josip

doi:10.1155/2019/8621486

Cited by 46 publications

(23 citation statements)

References 33 publications

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“…Although wood is substantially transformed during thermal modification, in a number of studies, it has been observed that the coating formulations intended for the use on unmodified wood suits as well for application on TM wood as a substrate [26][27][28]. Nonetheless, the increased hydrophobic character of heat-treated wood and the changes of the polarity of surface energy of wood could cause problems with the adhesion of waterborne coatings [29].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Thermally Modified Wood Stability against Discoloration

et al. 2021

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Thermal modification of wood has gained its niche in the production of materials that are mainly used for outdoor applications, where the stability of aesthetic appearances is very important. In the present research, spectral sensitivity to discoloration of thermally modified (TM) aspen wood was assessed and, based on these results, the possibility to delay discoloration due to weathering by non-film forming coating containing transparent iron oxides in the formulation was studied. The effect of including organic light stabilizers (UVA and HALS) in coatings as well as pretreatment with lignin stabilizer (HALS) was evaluated. Artificial and outdoor weathering was used for testing the efficiency of different coating formulations on TM wood discoloration. For color measurements and discoloration assessment, the CIELAB color model was used. Significant differences between the spectral sensitivity of unmodified and TM wood was observed by implying that different strategies could be effective for their photostabilization. From the studied concepts, the inclusion of the transparent red iron oxide into the base formulation of the non-film forming coating was found to be the most effective approach for enhancing TM wood photostability against discoloration due to weathering.

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Section: Introductionmentioning

confidence: 99%

Enhancing Thermally Modified Wood Stability against Discoloration

et al. 2021

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“…This is in line with findings that vegetable oils do not penetrate cell walls [17], making it possible to apply a coat of paint. However, it is not recommended to use wood after modification without any coating for outdoor use, as it is not weather-resistant [18].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Properties of Resonant Spruce Wood Modified Using Oil-Heat Treatment (OHT)

Mania

Gąsiorek

2020

Materials

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Wedge-shaped boards of spruce wood (Picea abies Karst.) are used to make violin fronts, also known as soundboards. Oil-heat treatment (OHT) can influence the acoustic properties of resonant wood, such as spruce. In this study, the effect of OHT on spruce wood was evaluated, using palm oil as a heating medium, at four different temperatures: 140, 160, 180 and 200 °C. Physical, mechanical and acoustic properties of spruce wood were evaluated before and after OHT and included the following: density, modulus of elasticity in the static bending test, and wood sound velocity. The acoustic parameters after OHT improved; however, the samples bent after modification had a higher modulus of elasticity, with a simultaneous deterioration of the acoustic parameters. The dynamic modulus of elasticity increased by 11%, and the musical constant by 5%. The static modulus increased by more than 3.5%, but the acoustic parameters calculated on the basis of these results indicated a deterioration of the acoustic properties of completely oven-dried wood. The increase in moisture content to air-dried condition contributed to a slight increase in the mean musical constant at the highest modification temperature.

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“…It can be concluded that thermally modified wood has poor resistance against weathering, and surface treatment with coatings is required for both protection and aesthetic reasons. A more detailed review of the recent results in the field of weathering performance of thermally modified wood is given in the paper prepared by Jirouš-Rajković and Miklečić [ 207 ].…”

Section: Thermal Modificationmentioning

confidence: 99%

Enhancing Weathering Resistance of Wood—A Review

Jirouš-Rajković

Miklečić

2021

Polymers

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Wood is a truly sustainable and aesthetically pleasant material used in indoor and outdoor applications. Every material, including wood, is expected to have long-term durability and to retain its original appearance over time. One of the major disadvantages of wood is the deterioration of its surface when exposed outdoors, known as weathering. Although weathering is primarily a surface phenomenon, it is an important issue for wood products as it affects their appearance, service life, and wood-coating performance. To encourage the use of wood as a material for joinery and other building components, the results of research into increasing the weathering resistance of wood are extremely significant. The development of weathering protection methods is of great importance to reduce the maintenance requirements for wood exposed outdoors and can have a major environmental impact. There are various methods of protecting wood surfaces against weathering. This paper provides a literature survey on the recent research results in protecting wood from weathering. The topics covered include surface treatments of wood with photostabilizers; protection with coatings; the deposition of thin film onto wood surfaces; treatments of wood with inorganic metal compounds and bio-based water repellents; the chemical modification of wood; the modification of wood and wood surfaces with thermosetting resins, furfuryl alcohol, and DMDHEU; and the thermal modification of wood.

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Heat-Treated Wood as a Substrate for Coatings, Weathering of Heat-Treated Wood, and Coating Performance on Heat-Treated Wood

Cited by 46 publications

References 33 publications

Enhancing Thermally Modified Wood Stability against Discoloration

Enhancing Thermally Modified Wood Stability against Discoloration

Acoustic Properties of Resonant Spruce Wood Modified Using Oil-Heat Treatment (OHT)

Enhancing Weathering Resistance of Wood—A Review

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