Painting properties and lightfastness of microwave puffed wood-based metal composites

Tao Xin; Tian Dongxue; Liang Shanqing; Li Shanming; Peng Limin; Fu Feng

doi:10.12171/j.1000-1522.20230190

Journal of Beijing Forestry University > 2023 > 45(10): 140-148. > DOI: 10.12171/j.1000-1522.20230190

Tao Xin, Tian Dongxue, Liang Shanqing, Li Shanming, Peng Limin, Fu Feng. Painting properties and lightfastness of microwave puffed wood-based metal composites[J]. Journal of Beijing Forestry University, 2023, 45(10): 140-148. DOI: 10.12171/j.1000-1522.20230190

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Painting properties and lightfastness of microwave puffed wood-based metal composites

Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China

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Received Date: July 30, 2023
Revised Date: September 12, 2023
Accepted Date: September 12, 2023
Available Online: September 15, 2023

Graphical Abstract

Abstract

Abstract

Objective
Puffed wood-based metal composite (PWMC) is decorative metallic wood material with a high thermal conductivity and moderate density. To provide technical reference for its future high value-added applications in the fields of interior decoration and household wooden products, the research on painting properties and lightfastness of PWMC had been carried out in this paper.
Method
Waterborne polyurethane paints were coated on PWMC surface. We studied the effect of painting number on the colorimetric parameters and gloss. The relationship between sandpaper grit and film adhesion was investigated by comprehensively analyzing the surface roughness parameters. Meanwhile, the surface color changes and gloss loss rate were characterized after 720 h artificially accelerated UV ageing treatment. The photodegradation mechanism was also analyzed by comparing the surface chemical structures.
Result
Clear varnish finishes play a dual role of protection and decoration for PWMC. After the three-primers and two-topcoats painting treatment, the total color difference values of PWMC, wood area, and metal area were 10.26, 9.07 and 3.22, respectively. It indicated that the color variation of the wood area was larger than that of the metal area. The gloss value difference between wood and metal areas decreased from 17.7 to 2.3 after painting, representing that the painting treatment resulted in a more uniform surface gloss. The roughness parameters of PWMC wood and metal areas were similar when sandpaper grit was 240. It maintained a flat and homogeneous surface, thus PWMC had a best paint film adhesion (level 0). Under artificially accelerated UV ageing of 720 h, PWMC wood area changed to greenish-yellow, and the lightness of wood and metal areas increased. The colorimetric parameter changes and light loss rate of wood and metal areas were reduced after painting. It confirmed that the enhancement of waterborne polyurethane paints on the lightfastness of PWMC. Infrared spectroscopy and X-ray photoelectron spectroscopy showed an increase in the oxidation state of carbon atoms, indicating oxidative degradation happened in PWMC wood area and coating paints under light irradiation.
Conclusion
The painting properties and lightfastness are investigated, providing a theoretical and technical basis for the value-added utilization of PWMC.
- wood-based metal composite,
- waterborne polyurethane paints,
- film adhesion performance,
- chromaticity parameter,
- gloss value,
- painting property,
- lightfastness

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References (20)

References

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Painting properties and lightfastness of microwave puffed wood-based metal composites