Effect of Iron Oxide on the Protective Photochromism of African Padauk

Wang, Chen; Ye, Qin; Wang, Fang; Wang, Zhiping; Huang, Anmin

doi:10.1155/2019/8698746

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…Padauk wood is used for making furniture, musical instruments, and for construction purposes. Although many applications are implemented, it is still possible to obtain many new applications of this material [ 22 , 23 ]. Thermal treatment of iroko and padauk wood caused a decrease in its density, colour darkening, and considerable improvement of dimensional stability [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Changes of Meranti, Padauk, and Merbau Wood Lignin during the ThermoWood Process

et al. 2021

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Thermal modification is an environmentally friendly process in which technological properties of wood are modified using thermal energy without adding chemicals, the result of which is a value-added product. Wood samples of three tropical wood species (meranti, padauk, and merbau) were thermally treated according to the ThermoWood process at various temperatures (160, 180, 210 °C) and changes in isolated lignin were evaluated by nitrobenzene oxidation (NBO), Fourier-transform infrared spectroscopy (FTIR), and size exclusion chromatography (SEC). New data on the lignins of the investigated wood species were obtained, e.g., syringyl to guaiacyl ratio values (S/G) were 1.21, 1.70, and 3.09, and molecular weights were approx. 8600, 4300, and 8300 g·mol−1 for meranti, padauk, and merbau, respectively. Higher temperatures cause a decrease of methoxyls and an increase in C=O groups. Simultaneous degradation and condensation reactions in lignin occur during thermal treatment, the latter prevailing at higher temperatures.

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Section: Introductionmentioning

confidence: 99%

Changes of Meranti, Padauk, and Merbau Wood Lignin during the ThermoWood Process

et al. 2021

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“…Wood is susceptible to degradation from UV light, resulting in discoloration. Wang et al [19] found that different concentrations of red iron oxide coatings have a strong inhibitory effect on the discoloration of African mahogany. Cirule et al [20] studied the addition of organic light stabilizers (UVA and HALS) and lignin stabilizers (HALS) to coatings to pretreat wood.…”

Section: Introductionmentioning

confidence: 99%

Effect of Coating Process of Photochromic and Thermochromic Composite Microcapsules on Coating Properties for Basswood

2022

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In this paper, photochromic and thermochromic microcapsules were selected. There are three different coating processes: “the primer with the photochromic microcapsules, the topcoat with the thermochromic microcapsules”, “the primer with the thermochromic microcapsules, the topcoat with the photochromic microcapsules”, and “the photochromic and thermochromic microcapsules added into the primer and topcoats” to explore the color-changing effect of the coating on the surface of basswood (Tilia) and the comprehensive properties of the paint film. The optical properties, mechanical properties, cold liquid resistance, and aging resistance of the coating were mainly analyzed. It was concluded that the comprehensive performance of the coating was the best when thermochromic and photochromic microcapsules were mixed on the surface of basswood (Tilia). At a temperature of 80 °C, the color difference reached a maximum of 20.2, and the coating was completely discolored. The color difference of the coating after discoloration under visible light illumination was 56.9. The gloss under the angle of incidence at 60° was 37.4, hardness was 3H, adhesion grade was 1, impact resistance was 10.0 kg·cm, and cold liquid resistance grade was 1. The method of mixing the two microcapsules had better aging resistance. In this paper, the photochromic and thermochromic properties of the coating were studied, and the optimal discoloration of the surface coating of the basswood substrate was solved by different coating processes. This study provided a method for a coating to achieve both photochromic and thermochromic discoloration, broadening the application of discoloration coatings.

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Effect of Iron Oxide on the Protective Photochromism of African Padauk

Cited by 2 publications

References 33 publications

Changes of Meranti, Padauk, and Merbau Wood Lignin during the ThermoWood Process

Changes of Meranti, Padauk, and Merbau Wood Lignin during the ThermoWood Process

Effect of Coating Process of Photochromic and Thermochromic Composite Microcapsules on Coating Properties for Basswood

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