Patination of cherry wood and spruce wood with ethanolamine and surface finishes

Petrič, Marko; Kričej, Borut; Humar, Miha; Pavlič, Matjaž; Tomažič, Miro

doi:10.1007/bf02699635

Cited by 25 publications

(24 citation statements)

References 12 publications

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“…Last, the variations of ΔE* in the different species ( Figure 3) are attributable to the variations in the chemical compounds, mainly the extractives present in each wood type (Chung-Yun and Mon-Lin 1988), and its capacity of interaction with the finish (Petric et al 2004, Pandey 2005b. The species-finish interaction in A. mangium and T. grandis (classified as dark colored woods) was probably better in NW, showing lower values of ΔE* (Figure 3a and 3h).…”

Section: Color Change After Exposurementioning

confidence: 99%

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Optical performance of finished and unfinished tropical timbers exposed to ultraviolet light in the field in Costa Rica

Salas

Moya

Vargas-Fonseca

2014

Wood Material Science & Engineering

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This study evaluated wood color change (ΔE*) and the surface quality in 10 tropical wood species painted with three finishes (composed of wax and polyurethane). Two weathering conditions were tested: natural weathering (NW) and artificial weathering (AW). The results showed that the application of these finishes, decreased the luminosity (L*), increased the redness (a*) and the yellowness (b*) parameters in all species. ΔE*, after weathering exposure, was affected significantly by L*, a*, and b, whereas for finished or pretreated wood, L* and b* are the main parameters affecting ΔE* in the 10 tropical species studied. ΔE* values found in different finishes and pretreatments are cataloged as total change of color. Other important results were that tropical light colored timber with natural pretreatment produced higher ΔE* than dark colored timber. The stains and fungal development were observed in polyurethane finishes in NW, but not in AW. The irregular and mosaic flaws were not observed in any kind of finish or pretreatment of surface. The values of the quality index created, which considered long and short lines and switch flaws, were lowest in NW and in waxy finish, while the highest value was obtained with the polyurethane finish.

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Section: Color Change After Exposurementioning

confidence: 99%

“…The studies on the deterioration of wood surface finishes usually focus on temperate wood species (Petric et al 2004, Deka et al 2008, Ahajji et al 2009). Due to this orientation, many factories use wood species from temperate climates to establish the characteristics of the finish they produce.…”

Section: Introductionmentioning

confidence: 99%

Optical performance of finished and unfinished tropical timbers exposed to ultraviolet light in the field in Costa Rica

Salas

Moya

Vargas-Fonseca

2014

Wood Material Science & Engineering

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“…For instance, while ΔL* of Scots pine decreased by 11,65; 11,27 and 7,57 for 2 h, 4h, and 8h of treatment at 140 °C, respectively, it decreased by 3,18; 1,00 and 0,47 for 2 h, 4h, and 8h of treatment at 200 °C. The darkening of Scots pine might be due to degradation of lignin and other non-cellulosic polysaccharides (Hon and Chang 1985, Grelier et al 2000, Petric et al 2004. The positive values of Δa* indicate a tendency of wood surface to become reddish.…”

Section: Color Changesmentioning

confidence: 99%

Some surface properties of thermally modified scots pine after artificial weathering

Baysal¹,

Degirmentepe²,

Simsek³

2014

Maderas, Cienc. tecnol.

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In this study, it was aimed to investigate some surface characteristics such as surface roughness, color, and glossiness of Scots pine (Pinus sylvestris) wood specimens after 500 hours artificial weathering exposure. The results showed that surface characteristics of thermally modified Scots pine gave better results than unmodified Scots pine after artificial weathering. Artificial weathering caused an increase in surface roughness and a decrease in glossiness of Scots pine wood. Results showed artificial weathered wood become darker, reddish, and yellowish. Generally, higher duration and temperature for Scots pine resulted in better surface characteristics of Scots pine after artificial weathering.

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“…Studies such as those by Cui et al ., Petric et al ., Tolvaj and Mitsui, Deka et al ., Oltean et al ., and Ahajji et al . have shown that ultraviolet light (UV), visible light, and infrared (IR) light are the discoloration factors most responsible for generating major chemical reactions in the cell walls of wood.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the detrimental effect of weathering, a great array of chemical products (finishes) has been developed to be applied on wood surfaces . Varnishes are a subsection of finishes that contain oils and resins (inorganic and inorganic) as active components.…”

Section: Introductionmentioning

confidence: 99%

Correlation and modeling between color variation and quality of the surface between accelerated and natural tropical weathering in Acacia mangium, Cedrela odorata and Tectona grandis wood with two coating

Valverde

Moya

2013

Color Research & Application

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To prevent the photodegradation process, a wide range of coatings have been developed. This study evaluated wood color change (DE*) and the surface quality index (SQI) generated by ASTM D-660 standards in wood protected with polyurethane and varnish finishes of three tropical species (Acacia mangium, Cedrela odorata and Tectona grandis) in two weathering conditions (natural and accelerated condition). In addition, a model was developed to predict DE* and SQI in natural weathering based on DE* and SQI from accelerated weathering. The results showed that the application of these finishes generated variations in the color parameters of wood before being exposed to the elements. Additionally, it was found that finishes generated increases in DE*, especially the varnish type finish, and decreasing of SQI. Finally, models were found to predict color changes or surface quality in natural weathering based on color changes or surface quality in accelerated weathering. The model algorithm was expressed by DE* or SQI measured (X) and time exposure (t) in accelerated weathering by equationWith these models, it is possible to predict the equivalence of exposure times in natural weathering in tropical conditions for different kinds of finishes in three tropical species.

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Patination of cherry wood and spruce wood with ethanolamine and surface finishes

Cited by 25 publications

References 12 publications

Optical performance of finished and unfinished tropical timbers exposed to ultraviolet light in the field in Costa Rica

Optical performance of finished and unfinished tropical timbers exposed to ultraviolet light in the field in Costa Rica

Some surface properties of thermally modified scots pine after artificial weathering

Correlation and modeling between color variation and quality of the surface between accelerated and natural tropical weathering in Acacia mangium, Cedrela odorata and Tectona grandis wood with two coating

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