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題 名 | 聚胺基甲酸酯塗膜抑制杉木光劣化之評估=Evaluation of the Effects of Polyurethane Films on Inhibiting the Photodegradation of China Fir Wood |
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作 者 | 張惠婷; 葉汀峰; 張上鎮; | 書刊名 | 林產工業 |
卷 期 | 21:4 2002.12[民91.12] |
頁 次 | 頁271-279 |
分類號 | 474.33 |
關鍵詞 | 木材; 杉木; 透明塗裝; 光劣化; 聚胺基甲酸酯塗料; 游離塗膜; Wood; Cunninghamia lanceolata; Clear coating; Photodegradation; Polyurethane coating; Free film; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究係以眾胺基甲酸酯游離塗膜覆蓋於杉木上方,進行加速耐光試驗,分析塗膜及其下方木材的光劣化。分析芳香族及脂肪族聚胺基甲酸酯塗膜過濾光線的效果得知,以脂肪族聚胺基甲酸酯塗膜可穿透紫外光的波長範圍較廣,添加紫外光吸收型光安定劑於塗膜中,可以吸收大部分的紫外光,使穿透塗膜的光線以可見光為主。芳香族聚胺基甲酸酯塗膜照光後,紫外光區的穿透率逐漸降低;而脂肪族聚胺基甲酸酯塗膜反而隨照光時間增加,紫外光區穿透的範圍較廣,且穿透率隨照光時間增長而升高,使塗膜下方木材的黃光化程度較其他試材嚴重。分析各塗膜下方杉木化學組成分的變化,同樣以脂肪族要在胺基甲酸酯塗膜下方木材的光劣化最為明顯;而位於含光安定劑之芳香族聚胺基甲酸酯塗膜下方的杉木,其組成分的光降解最為緩慢,顯示含光安定劑芳香族聚胺基甲酸酯塗膜對下方杉木的保護效果最好。由本試驗結果得知良好的透明塗料,應具不易黃化以及過濾紫外光的效能,方能使塗膜下方木材可以受到良好的保護。 |
英文摘要 | For better understanding of the photodegradation of underlying China fir (Cunninghamia lanceolata) wood finished by clear coatings, in this study wood specimens covered with polyurethane free films were used to simulate clear-coated wood. Analyses from the UV-VIS transmittance spectra of aromatic and aliphatic polyurethane films, the wavelength range of penetrable UV light of aliphatic polyurethane film was wider than that of aromatic polyurethane film. Adding the light stabilizer in both polyurethane films can effectively cut off the UV light. The transmittance percentage of UV light of aromatic polyurethane film decreased after irradiation, whereas the transmittance percentage of UV light of aliphatic polyurethane film increased with the irradiation time. It resulted in the more serious photoyellowing of wood beneath aliphatic polyurethane film after lightfastness test. Comparisons of chemical characteristic variations in photodegraded wood beneath different free films, the decomposition of wood beneath aliphatic polyurethane film was faster than the others. Aromatic polyurethane film containing light stabilizer slowed down the deterioration of underlying wood, the protection effect of the aromatic polyurethane film containing light stabilizer was better than that of the other films. These results revealed that the efficiency in cutting off the UV light of the clear coating was also important besides the non-yellowing property. |
本系統中英文摘要資訊取自各篇刊載內容。