Enhancing the performance of exterior waterborne coatings for wood by inorganic nanosized UV absorbers

Cristea, Mirela; Riedl, Bernard; Blanchet, Pierre

doi:10.1016/j.porgcoat.2010.08.006

Cited by 121 publications

(81 citation statements)

References 25 publications

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“…The effectiveness of the modified coating at reducing discoloration was further enhanced if the wood was pre-treated with an organic "lignin stabilizer" [65]. Similarly, Cristea and Riedl showed that zinc oxide and titanium dioxide nanoparticles improved the durability of clear coatings on black spruce wood exposed to accelerated weathering [66]. Auclair and co-workers compared the ability of different inorganic (zinc or copper oxide nanoparticles) and organic photostabilizers (UVA/HALS) to prevent the discolouration of clear-coated sugar maple panels exposed to accelerated weathering [67].…”

Section: Inorganic Photostabilizersmentioning

confidence: 93%

The Search for Durable Exterior Clear Coatings for Wood

et al. 2015

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Abstract:The goal of a durable exterior clear coating has eluded generations of coatings technologists, despite long-standing desire amongst the public for such a coating. The journey towards this goal initially focused on modifications to coating formulation, but took a completely different direction when it was found that a UV-transparent silicone clear coating on wood modified with chromic acid met consumer expectations of coating durability. This finding sparked world-wide interest in wood pre-treatments as a way of enhancing the durability of clear coatings. This interest initially focused on transition metal compounds, but has now shifted in the direction of organic and inorganic photostabilizers or even more drastic pre-treatments. Pre-treatments that dimensionally stabilize wood, protect it from microbial degradation and photostabilize lignin, when combined with flexible, photostable, coatings provide the next way-stop on the journey towards achieving the goal of durable exterior clear coatings for wood. This paper reviews this journey, drawing upon our research and that of other groups who have focused on this elusive goal. OPEN ACCESSCoatings 2015, 5 831

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Section: Inorganic Photostabilizersmentioning

confidence: 93%

The Search for Durable Exterior Clear Coatings for Wood

et al. 2015

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“…When bamboo is exposed to outdoor weathering conditions such as solar radiation, moisture, oxygen, high temperatures, bacteria, or fungus, the exterior becomes discolored, and it loses its glossiness. In addition, its strength and adhesive capabilities are reduced; it becomes rougher and exhibits chalking (Hayoz et al 2003;George et al 2005;Pandey 2005;Cristea et al 2010;Chaochanchaikul et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The depth of the photodegradation and the rate of erosion of the wood during weathering depends greatly on the density (Horn et al 1994;Evans et al 2005). Many previous studies of anti-aging treatments have focused on the changes in the physical and mechanical properties, color characteristics, and chemical composition of bamboo and bamboo-based composites (Beckers et al 1998;Cristea et al 2010;Lesar et al 2011;Tolvaj et al 2011;Srinivas and Pandey 2012;Tomak et al 2012;Baysal et al 2014;Tolvaj et al 2014;Li et al 2015;Zhu et al 2015;Shangguan et al 2016). Furthermore, the effects of the density on the performance of bamboo and bamboo-based composites have been reported Tolvaj et al 2011;Srinivas and Pandey 2012;Baysal et al 2014;Tolvaj et al 2014;Li et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Rao¹,

Chen²,

Li³

et al. 2017

BioResources

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aOutdoor bamboo-fiber-reinforced composites (OBFRCs) with four different densities were prepared, and the microstructure and physicomechanical properties of pristine samples were evaluated. In addition, the surface color, glossiness, roughness, water absorption, and wettability of the samples were tested to investigate the effects of panel density on the extent of surface weathering due to ultraviolet radiation. The results showed that the OBFRCs exhibited excellent physical and mechanical properties, which improved with increasing density. However, increases in the density led to decreases in the hygroscopicity and dimensional stability of the OBFRCs. After weathering, the surface contact angle and surface roughness increased, and the dimensional stability improved. The surface glossiness, water absorption, and surface free energy decreased. A higher density resulted in improved color stability, which suggested that density played an important role in determining surface photodegradation properties. Thus, densityincreasing treatments had positive effects on the physical and mechanical properties as well as the color stability and wettability of the OBFRCs, but they may negatively affect the roughness and dimensional stability. Based on service-performance and cost-minimization considerations, 1.1 g/cm 3 was determined as the most appropriate density for general applications.

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“…Mineral screeners -UV blockers such as zinc oxide and titanium dioxide (Cristea et al 2010;Forsthuber et al 2013), HALS -hindered amine light stabilizers (Schaller et al 2009(Schaller et al , Šomšák et al 2015, antioxidants such as bark extract (Saha et al 2011), and lignin stabilizers such as succinic anhydride (Teacà et al 2013) are some of the most progressive color stabilizing additives in the transparent or lightly-pigmented coating systems for the finishing of outdoor wood products. It is also important that these coatings have good aesthetic quality and maintain the appearance of the natural, uncoated wood.…”

Section: Introductionmentioning

confidence: 99%