Effect of Two Different Ageing Exposures on the Colour Stability of Transparent Polyurethane Finishing
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Ageing Exposures
2.3. Evaluation of Colour Change
2.4. Statistical Evaluation
3. Results and Discussion
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Wood Species | Wood Treatment | Ageing Exposure |
---|---|---|
|
|
|
| ||
| ||
|
Radiation [kWh·m−2] | Temperature [°C] | |||
---|---|---|---|---|
Average | Standard Deviation | Average | Standard Deviation | |
July | 5.215 | 1.383 | 19.6 | 2.4 |
August | 4.496 | 1.081 | 20.5 | 1.6 |
September | 3.237 | 1.204 | 15.5 | 2.8 |
Description | |
---|---|
Not visible difference | |
< 2 | Small difference |
< 3 | Colour difference visible with high-quality screen |
< 6 | Colour difference visible with medium-quality screen |
< 12 | High colour difference |
> 12 | Different colours |
Colour Coordinates | Exposition | Wood Species | |||||||
---|---|---|---|---|---|---|---|---|---|
European Beech | Alder | Norway Maple | Paper Birch | ||||||
Untreated | HTT | Untreated | HTT | Untreated | HTT | Untreated | HTT | ||
L* | Dark | ◯ | – | ◯ | – | ◯◯◯ | ◯◯◯ | – | – |
Light | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯ | ◯◯◯ | – | ◯◯◯ | ◯◯◯ | |
a* | Dark | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯ | ◯◯◯ | ◯◯◯ |
Light | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | – | ◯◯◯ | ◯◯◯ | |
b* | Dark | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | – |
Light | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | |
C* | Dark | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯ |
Light | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯ | |
h° | Dark | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯ | ◯◯◯ | – | ◯◯◯ | ◯◯◯ |
Light | ◯◯ | ◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯◯◯ | ◯ | ◯◯◯ |
Exposition | European Beech | Alder | Norway Maple | Paper Birch |
---|---|---|---|---|
Before | ||||
Dark | ||||
= 2.7 | = 3.1 | = 3.4 | = 2.8 | |
Light | ||||
= 7.7 | = 8.9 | = 12.6 | = 5.7 |
Exposition | European Beech | Alder | Norway Maple | Paper Birch |
---|---|---|---|---|
Before | ||||
Dark | ||||
= 2.7 | = 3.7 | = 4.1 | = 2.3 | |
Light | ||||
= 5.4 | = 6.5 | = 5.6 | = 3.8 |
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Slabejová, G.; Vidholdová, Z.; Šmidriaková, M. Effect of Two Different Ageing Exposures on the Colour Stability of Transparent Polyurethane Finishing. Polymers 2023, 15, 3313. https://doi.org/10.3390/polym15153313
Slabejová G, Vidholdová Z, Šmidriaková M. Effect of Two Different Ageing Exposures on the Colour Stability of Transparent Polyurethane Finishing. Polymers. 2023; 15(15):3313. https://doi.org/10.3390/polym15153313
Chicago/Turabian StyleSlabejová, Gabriela, Zuzana Vidholdová, and Mária Šmidriaková. 2023. "Effect of Two Different Ageing Exposures on the Colour Stability of Transparent Polyurethane Finishing" Polymers 15, no. 15: 3313. https://doi.org/10.3390/polym15153313