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題 名 | 塗裝木材人工加速劣化與自然曝露試驗之相關性(二)--室內耐光性=Correlation of Accelerated Testing to Natural Exposure of Coated Wood (Ⅱ)--Indoor Lightfastness |
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作 者 | 張上鎮; 蕭雅方; | 書刊名 | 中華林學季刊 |
卷 期 | 31:1=120 1998.03[民87.03] |
頁 次 | 頁105-114 |
分類號 | 436.188 |
關鍵詞 | 杉木; 硬槭木; 聚胺基甲酸酯塗料; 變色; 色差值; 耐光性; 人工加速劣化; 自然曝露試驗; 相關性; China fir; Hard maple; Polyurethane coating; Discoloration; Color difference; Lightfastness; Accelerated testing; Natural exposure; Correlation; |
語 文 | 中文(Chinese) |
中文摘要 | 建立人工加速劣化試驗與自然曝露試驗之相關性是十分重要的,因此,本研究將 杉木及硬槭木素材與塗裝材經由實際室內放置試驗與二種人工加速照光試驗後,分析其表面 顏色變化,然後再將色差值進行統計之迴歸與相關性分析,進而推算加速耐光性試驗相對於 實際室內放置試驗的加速因子(AF),並且利用曲線擬合方法,求出加速耐光性試驗與實際 室內放置試驗間的最適加速平移因子(ASF),以探討各種曝露試驗之相關及評估試材在室 內放置的耐久性。試驗結果證實,試材經過各種曝露試驗後之顏色變化趨勢類似,因此,可 以利用加速耐光性試驗來模擬評估試材在實際室內放置的顏色變化,且能在短時間內推知試 材在長時間室內放置後的變色程度。在各種曝露試驗之相關性分析結果發現,UVA-351加 速耐光試驗與室內放置試驗具有非常好的相關性(γ >0.9),表示利用UVA-351加速耐光 試驗可以在短時間內準確評估試材於室內放置試驗之顏色變化。又試驗結果亦顯示,利用色 差值之迴歸式進行推算加速耐光性試驗相對於實際室內放置試驗的AF及ASF值是可信的。 而所求得的AF值都大於ASF值,表示利用AF和ASF做為推估試材於實際室內放置試驗 色差值變化的程度有所差異,且AF及ASF值會受試材種類及試驗方法的影響而改變。而 AF值之求算結果會隨試驗時間不同而改變,而利用曲線擬合法推算的ASF值則幾乎為固定 值,且所得之曲線與試材之實際室內放置的色差值變化最為接近,所以利用ASF進行試材 耐久性能的推估較為方便且可信。 |
英文摘要 | It is of great importance to establish the correlation between accelerated testing and natural exposure. Therefore, after exposure to either accelerated lightfastness tester equipped with UVA-351 or UVA-340 sunlamp or indoor exposure, the color variations of uncoated and polyurethane coated China fir and hard maple were examined. Moreover, in addition to the regression and correlation analyses of color difference employed in this study, the Acceleration Factor (AF) was determined by comparing the initial rates of color changes in the accelerated lightfastnes testing and the natural exposure conditions. Meanwhile, curve fitting was used to select the most appropriate accelerated Shift Factor (ASF) for the entire period of durability test of the coated wood. Based on the similar tendencies of the color changes of specimens exposed to different exposure conditions, the color variations of specimens at the ambient conditions could be reasonably estimated from those of specimens exposed to the accelerated lightfastness test for a short period. Comparisons of the color differences of specimens obtained from the different exposure tests, the results of the UV lightfastness test (UVA-351 lamp) showed a highly significant Spearman rank correlation (γ >0.9) with those from the indoor exposure. The experimental results demonstrated that accelerated lightfastness test can be used to estimate the durability of a coating system to be exposed to indoor conditions in short term. The AF and ASF values changed under different testing methods and specimens. In this study, AF values were larger than ASF values, and AF values changed with exposure time but ASF values did not. The ASF, on the other hand, was the best fit of the data throughout the life of the coated wood, and specifically under their assumption that different specimens have different ASF values. Therefore, the advantage of using ASF to evaluate the durability of coated wood is easy and more confident. |
本系統中英文摘要資訊取自各篇刊載內容。