Performance of organic nanoparticle coatings for hydrophobization of hardwood surfaces

Samyn, Pieter; Stanssens, Dirk; Paredes, A M M; Becker, Günther

doi:10.1007/s11998-014-9576-9

Cited by 19 publications

(23 citation statements)

References 25 publications

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“…Based on the results, it can be concluded that the hydrophobic layers and the oil coating significantly increase the hydrophobicity of natural wood surfaces [14,77]. However, the increase in hydrophobicity after coating application [15,50,52] does not necessarily indicate long-term functionality during exposure to weathering (Figures 6 and 7). In general, the use of hydrophobic layers can only be recommended for sheltered wood (i.e., without leaching of extractives by water), which can lead to easier maintenance and cleaning during use.…”

Section: Resultsmentioning

confidence: 96%

“…This result therefore showed that this type of coating provides sufficient protection for oak wood in the initial phase of the weathering test, wherein it prevents the wood from leaching degraded extractives and lignin-see also the initial decrease of L* values (darkening) associated with the increase of a* values (reddening) and b* values (yellowing) after 1 week of weathering ( Figure 2, Table 4). The positive effect of hydrophobic coatings [15,18] preventing leaching and a decrease in total colour changes ∆E* was only observed after 3 weeks of weathering in cases when treatments A4, B, and B4 were used (Figure 2). However, after 6 weeks of weathering, only the combination of hydrophobic coatings with the surface modification of oak wood No.…”

Section: Resultsmentioning

confidence: 99%

“…Nowadays, with the development of nanotechnology, new hydrophobic coatings are being developed at a rapid pace [14,15]. The impact of their application on native wood [16][17][18], thermally modified or chemically treated wood [19], or application as a topcoat in coating systems [20][21][22] was investigated.…”

Section: Introductionmentioning

confidence: 99%

“…This could be potentially prevented using hydrophobic self-cleaning coatings in combination with UV stabilization of the underlying wood. Although more studies have been done to investigate the possibilities of wood surface hydrophobic modification [15,[50][51][52], their long-term efficiency during outdoor exposure should also be considered.…”

Section: Introductionmentioning

confidence: 99%

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Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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Abstract:The durability of transparent coatings applied to an oak wood exterior is relatively low due to its anatomic structure and chemical composition. Enhancement of the protection of oak wood against weathering using transparent hydrophobic coatings is presented in this study. Oak wood surfaces were modified using UV-stabilizers, hindered amine light stabilizer (HALS), and ZnO and TiO 2 nanoparticles before the application of a commercial hydrophobic topcoat. A transparent oil-based coating was used as a control coating system. The artificial weathering test lasted 6 weeks and colour, gloss, and contact angle changes were regularly evaluated during this period. The changes in the microscopic structure were studied with confocal laser scanning microscopy. The results proved limited durability against weathering of both tested hydrophobic coatings. The formation of micro-cracks causing the leaching of degraded wood compounds and discolouration of oak wood were observed after 1 or 3 weeks of the weathering test. Until then, an oil-based coating film had protected the wood sufficiently, but after 6 weeks the wood was fully defoliated to its non-homogenous thickness, which was caused by the presence of large oak vessels, and by the effects of specific oak tannins. Using transparent hydrophobic coatings can prolong the service life of the exteriors of wood products by decreasing their moisture content. Without proper construction protection against rainwater, the hydrophobic coating itself cannot guarantee the preservation of the natural appearance of wood exteriors.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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“…An efficient impregnant must substantially reduce water absorption of the substrate, present an adequate penetration and show an excellent resistance to environmental exposure [1] [2] [3] [4].…”

Section: Introductionmentioning

confidence: 99%

Low Density Wood Impregnation with Water-Repellent Organosilicic Compounds

Canosa¹,

Alfieri²,

Giúdice³

2018

MSCE

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Many protective treatments for low density wood are applied by impregnation to give water-repellency and to control pathologies that usually have this substrate. The properties of Araucaria angustifolia, chemically modified by impregnation with methyltriethoxysilane, n-octyltriethoxysilane and mixtures of both in several ratios, were investigated to achieve mainly high dimensional stability, low capillary water absorption as well as satisfactory water vapor permeability. The aforementioned impregnants produce the wood chemical modification, involving the reaction of hydroxyl groups of the wood with the hydrolysis products of alcoxysilanes. It is concluded that the organosilicon polymers allow improving important characteristics of wood: 1) the non-occlusive coating keeps the water vapor permeability unaltered; 2) the alkoxysilane type defines the hydrophobicity and the continuity of coating formed on the pore wall and finally; 3) the polymeric structure formed after finishing sol-gel process incises both on the capillary water absorption and the dimensional stability. In addition, the studied treatments have the advantage of allowing that the water vapor, which permeates through the organosilicon coating placed on cell wall, can exit by hydrophobic repulsion and thus, prevent faults appearance generated by the condensed water inside of wood.

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Chemical Protection of Wood

2016

Wood Deterioration, Protection and Maintenance

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Performance of organic nanoparticle coatings for hydrophobization of hardwood surfaces

Cited by 19 publications

References 25 publications

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

Low Density Wood Impregnation with Water-Repellent Organosilicic Compounds

Chemical Protection of Wood

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