Effect of thermal modification on the surface quality of a coating applied to wood via the electrostatic spray deposition technique

The surface properties of thermally modified ash wood with a powder coating were investigated, and the results were compared to the unmodified wood. The wood specimens were sanded with 80 grit sandpaper and then pre-heated at 80 °C for 5 min in an infrared oven. The surface of the unmodified and the...

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Published inBioresources Vol. 16; no. 4; pp. 7355 - 7366
Main Authors Ayrilmis, Nadir, Akkuş, Memiş, Yılmaz, Sena Nur
Format Journal Article
LanguageEnglish
Published Raleigh North Carolina State University 01.11.2021
Subjects
Abrasion
Abrasion resistant coatings
Coatings
Contact angle
Cost control
Curing
Distilled water
Experiments
Furniture industry
Hardwoods
Mechanical properties
Moisture content
Polyesters
Powder coating
Protective coatings
Sanding
Scratch resistance
Solvents
Spray deposition
Spray guns
Substrates
Surface properties
Surface roughness
VOCs
Volatile organic compounds
Istanbul Turkey
Turkey
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Summary:The surface properties of thermally modified ash wood with a powder coating were investigated, and the results were compared to the unmodified wood. The wood specimens were sanded with 80 grit sandpaper and then pre-heated at 80 °C for 5 min in an infrared oven. The surface of the unmodified and the modified wood specimens were coated with an epoxy/polyester (1 to 1 ratio) hybrid coating using an electrostatic corona spray gun at the pilot plant established in the laboratory. The coatings on the wood specimens were cured at different curing conditions in an infrared oven, i.e., 120 °C/15 min, 140 °C/10 min, and 160 °C/10 min. The results showed that the thermal modification (TM) of the wood caused a slight decrease in the mechanical performance of the surface system (wood substrate and coating film). For example, the scratch and abrasion resistance of the unmodified specimens at the curing temperature of 120 °C were 3.33 N and 135 revolutions but were 3.12 N and 120 revolutions after the TM. However, the average surface roughness (1.26 mu) and contact angle (60.8°) of the distilled water on the cured coatings on the modified wood were lower than those on the unmodified wood (1.86 mu and 80.8°, respectively).
ISSN:1930-2126
1930-2126
DOI:10.15376/biores.16.4.7355-7366