Degradation of Oil Paint Coating Based on Wood Under the Combined Effect of UV Light and Heat

文献类型： 外文期刊

第一作者： Zuo, Shaojun

作者： Zuo, Shaojun;Chen, Tong;Liu, Xinyou;Li, Tongtong;Li, Jianing;Liu, Xinyou

作者机构：

关键词： color change; FTIR; gloss loss; SEM; UV degradation; wood coatings

期刊名称：FORESTS （ 影响因子：2.5； 五年影响因子：2.7 ）

ISSN：

年卷期： 2025 年 16 卷 1 期

页码：

收录情况： SCI

摘要： This study examined the degradation of oil paint coatings on wood under UV light and heat, focusing on three drying oils: tung oil (TO), linseed oil (LO), and walnut oil (WO). Model coatings were prepared with malachite pigment on rubber wood, then exposed to 240 h of UV light at temperatures of 40 degrees C, 50 degrees C, and 60 degrees C. The results showed that tung oil (TO) was the most prone to degradation. After exposure to 60 degrees C, the lightness (L value) of TO decreased from 51.44 to 50.98, while LO and WO maintained higher lightness. The color differences (Delta E) for TO, LO, and WO were 3.08, 3.26, and 2.87, respectively. Gloss measurements revealed that TO had the lowest initial gloss (3.87 GU), while WO had the highest gloss value. After UV exposure, all three coatings showed a decrease in gloss to varying degrees. Fourier transform infrared spectroscopy (FTIR) analysis confirmed oxidative degradation in TO, characterized by increased hydroxyl and carbonyl bands, while LO and WO exhibited better chemical stability. Scanning electron microscopy (SEM) images revealed that the surface of TO was the roughest, while the WO surface was the smoothest. After UV exposure, the surface of TO became significantly rougher, while the WO coating showed almost no changes, maintaining better structural integrity. The results suggest that LO and WO are more resilient to UV light and thermal stress, making them more suitable for protecting wooden products.

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