Sensitivity of waterborne coating materials to high acidity and high content of arabinogalactan in larch heartwood

Grüll, Gerhard; Forsthuber, Boris; Ecker, Monika

doi:10.1016/j.porgcoat.2016.08.015

Cited by 10 publications

(18 citation statements)

References 14 publications

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“…When exterior oil-based coating (C) is applied, a longer service life can be expected in the case of softwoods [79] that have a morphological structure that is more simple than hardwoods with wide open vessels [57]. However, each underlying wood can affect the service life of the coating individually through the specific content of the extractives [27], and it is therefore necessary to confirm these assumptions by testing and comparing the evaluated characteristics [20,23,25].…”

Section: Resultsmentioning

confidence: 99%

“…Based on the results of experimental studies, the type of coating system influences the overall service life of coatings [25] and the underlying wood [23,26]. Particularly, wood species with high extractives content are reported as problematic in the field of coating application [27]. The use of hydrophobic layers instead of traditional coating systems has the advantage of easier application (only 1 layer of hydrophobization is sufficient).…”

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: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…The next logical step is to test whether the tested pretreatments can prevent discoloration of specific wood without affecting coating performance. The careful selection of active additives enables the formulation of coating materials with lower sensitivity to specific surface properties of larch wood and thus higher quality [32]. In addition, the coating systems (stabilizing pretreatment + available coating) can be a significant improvement of those currently commercially available and potentially applicable for European and Siberian larch wood.…”

Section: Discussionmentioning

confidence: 99%

“…Larch wood combines relatively high natural durability against bio-damage [31], density and strength and aesthetically-valued texture and color [32]. This determines the larch wood for outdoor applications-such as facades, fences, windows, terraces, rails, etc.-but also for indoor ones such as staircases, floors, or massive furniture.…”

Section: Introductionmentioning

confidence: 99%

“…This determines the larch wood for outdoor applications-such as facades, fences, windows, terraces, rails, etc.-but also for indoor ones such as staircases, floors, or massive furniture. Recently, the popularity of Siberian larch (Larix sibirica) with a higher annual ring density, strength and higher natural durability [31] has increased [32]. European larch (Larix decidua) and, to a greater extent, Siberian larch are wood species with a high acidity and extractive content (especially resins and arabinogalactans) [31,33], which complicates the application of coating systems and maintaining their long service life.…”

Section: Introductionmentioning

confidence: 99%

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Color Stabilization of Siberian and European Larch Wood Using UVA, HALS, and Nanoparticle Pretreatments

Oberhofnerová

Pánek

Podlena

et al. 2019

Forests

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Reducing discoloration of wood due to photodegradation caused by ultraviolet (UV) and visible (VIS) radiation enhances its aesthetical value and prolongs the overall service life of protective coatings. In this study, the efficiency of pretreatments with different active ingredients to reduce degradation and stabilize the color of Siberian (Larix sibirica Ledeb.) and European larch (Larix decidua Mill) wood was investigated. UV absorbers (UVA), hindered amine light stabilizers (HALS) and zinc oxide nanoparticles were used in twenty different pretreatments. The ability to protect wood surface against radiation was evaluated via color and gloss change measurements during artificial ageing. The efficiency of tested color-stabilizing pretreatments differed for Siberian and European larch and not all of them reduced discoloration. The most effective pretreatments were based on a combination of UVA and HALS in a synergistic effect. Overall, the best efficiency from tested variants for larch wood generally was observed for combination of Eversorb 80 on benzotriazole basis + Eversorb 93 on a piperidinyl basis. The pretreatments did not significantly affect the gloss values. The results revealed convenient variants of stabilizers for Siberian and European larch wood and confirmed different compatibility between specific wood species and color stabilizers.

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Wood Preservation and Wood Finishing

Acker

Bulcke

Forsthuber³

et al. 2023

Springer Handbooks

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Sensitivity of waterborne coating materials to high acidity and high content of arabinogalactan in larch heartwood

Cited by 10 publications

References 14 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

Color Stabilization of Siberian and European Larch Wood Using UVA, HALS, and Nanoparticle Pretreatments

Wood Preservation and Wood Finishing

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