Performance of finishes on wood that is chemically modified by acetylation

Beckers, Epj; Meijer, M. de; Militz, Holger; Stevens, Marc

doi:10.1007/bf02697812

Cited by 40 publications

(22 citation statements)

References 7 publications

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“…Results indicated that chemical modification caused a significant decrease of MOR and MOE values. Acetylation was shown to have no effect on the drying characteristics and adhesion of coating (Beckers et al 1998). It also considerably improved their weathering performance.…”

Section: Acylation and Acetylation Treatmentsmentioning

confidence: 97%

New alternatives for wood preservation based on thermal and chemical modification of wood— a review

Gérardin

2015

Annals of Forest Science

193

126

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Key message Increasing environmental pressures appearing over the last few years have led to important changes in the field of wood protection. In this context, new technologies, based either on thermal or chemical modifications, suggest increasing interest in prospect of programmed ban of biocide products.• Context The evolution of the regulations on the use of biocide products has led to important changes in the field of wood preservation, leading to an increasing interest for non-biocide treatments like thermal or chemical modifications to face to the programmed ban of biocide products.• Aims The paper reviews the different non-biocide alternatives developed currently on an industrial scale, highlighting their main characteristics and applications.• Results Different treatments have been developed on an industrial scale involving mainly thermal modifications and acetylation, furfurylation and DMDHEU constituting already available solutions.• Conclusion Different non-biocide alternatives already exist and will become more important in the next decades due to the increasing legislative pressure driven by environmental considerations.

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Section: Acylation and Acetylation Treatmentsmentioning

confidence: 97%

New alternatives for wood preservation based on thermal and chemical modification of wood— a review

Gérardin

2015

Annals of Forest Science

193

126

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“…However, thermal treatment also degrades its natural color and strength (Shangguan et al 2016;Yang et al 2016). To counteract this effect, the lignin phenoxy radicals of acetylated wood have been used with some success in reducing photoinduced degradation and improving the dimensional stability of wood (Beckers et al 1998). Coating the exposed surfaces with inorganic and organic ultraviolet (UV) radiation absorbers is another option (Zhu et al 2008;Li et al 2015).…”

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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“…However, coatedacetylated wood was reported to have significant surface mildew growth on the finished surface after 3 years of natural weathering which probably impaired the effectiveness of the coatings [29]. Acetylation of wood was shown to improve colour stability of wood by preventing lignin degradation when modified woods were exposed to UV radiation [27,30,31].…”

Section: Effects Of Wood Treatmentsmentioning

confidence: 99%

Exterior Wood Coatings

Nejad¹,

Cooper²

2017

Wood in Civil Engineering

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In addition to aesthetic appeal, coatings are designed to protect the wood from weathering degradation in outdoor conditions. This chapter gives an overview of the effects of the main coating components, coating properties, wood properties and treatments on coated wood performance in service. Understanding how different type of resins, pigments, solvents, and other major additives affect coating performance on wood, helps coating formulators to develop more durable coatings. It is beneficial for both wood scientists and coating chemists to learn which properties of coatings have the highest impact on predicting their service lives when exposed to weathering. For instance, measuring glass transition temperature (Tg) defines the degree of flexibility of a coating. Since wood swells and shrinks due to moisture uptake and subsequent drying, flexibility of a coating plays a critical role in defining its durability on wood in exterior conditions. Similarly, learning how preservative treatment or a new modification technique changes the surface properties of wood will help coating formulators to adjust properties of coatings in way that would have better adhesion and performance on that specific modified wood. Also, the effects of these factors in increasing service life of exterior wood coatings are discussed.

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Performance of finishes on wood that is chemically modified by acetylation

Cited by 40 publications

References 7 publications

New alternatives for wood preservation based on thermal and chemical modification of wood— a review

New alternatives for wood preservation based on thermal and chemical modification of wood— a review

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

Exterior Wood Coatings

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