Evaluation of surface coatings on wood exposed to natural weathering conditions
The wood exposed to solar radiation (UV), relative air humidity (RH), temperature, precipitation, among othersuffers a process called weathering; as a result appear cracks, surface roughness and graying color of wood. The aim of this study was to analyze qualitatively the behavior of 11 coatings on Pinus ponderosa (Dougl. exLaws) wood exposed in La Plata, Argentina. There were tested: 9 market products –2 synthetic enamels; 3varnishes; 3 lasures and acrylic enamel- two lasures products in development, and an uncoated witness, a total of 12 treatments. Visual evaluations and photographic records are carried out every 30 days for 21 months, based on 6 variables: change of brightness and color, cracks, iron tanatos of the nails, fungi and wear of the coating, valued on a scale from 0 to 4. After 21 months of exposure, significant differences were observed between the coats. The synthetic glazes are the best performers, with values between 1.5 and 4, while varnishes and control yielded results between 0.2 and 1.1 depending on the variable, evidencing a loss of its useful life. The lasures had an intermediate behavior yielded values between 1.1 and 3.3. It is concluded there is no coating that cover all abiotic requirements and that does not suffer the action of weathering.
| Main Authors: | , , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Facultad de Ciencias Agrarias y Forestales de la Universidad Nacional de La Plata
2020
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| Online Access: | https://revistas.unlp.edu.ar/revagro/article/view/10196 |
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