研究目的
To study the colour stability and water content resistivity of the green colour coating paint film (consisting of chlorophyll) during exposure to ultraviolet A (UV-A).
研究成果
The addition of Cu(NO3)2 improved the colour stability of the coating paint film containing chlorophyll. Both coating films were found to be resistive to water content. The study demonstrates the potential of natural dyes in coating paint films, with Cu(NO3)2 enhancing their stability.
研究不足
The study is limited by the lack of purification of the natural green dye, which may affect the stability and performance of the coating paint film. The practical application is also limited to glass substrates.
1：Experimental Design and Method Selection:
The study involved preparing natural green dye from Cassia alata L. leaves, with and without Cu(NO3)2 additive, and mixing it with a polymer blend of PMMA and commercial acrylic polyol. The mixture was applied as a coating paint film on glass panels.
2：Sample Selection and Data Sources:
The samples were exposed to UV-A light, and their visible reflectance spectrum and water content resistivity were monitored.
3：List of Experimental Equipment and Materials:
Equipment included a UV Fluorescent Lamp, Avaspec-ULS2048L spectrometer, and ATR-FTIR type Nicolet iS
4：Materials included Cassia alata L. leaves, absolute ethanol, Cu(NO3)2, PMMA, and commercial acrylic polyol. Experimental Procedures and Operational Workflow:
The dye was extracted, mixed with the polymer blend, applied on glass panels, and exposed to UV-A. The reflectance spectrum and water content were analyzed over time.
5：Data Analysis Methods:
The reflectance spectrum was analyzed using Origin software, and water content was assessed via FTIR spectroscopy.
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