本文選題：鍛木單板 + 浸漬紙��； 參考：《東北林業(yè)大學》2011年碩士論文

【摘要】：選取常用的表面裝飾材料：木紋紙,PVC貼面(深色貼面、淺色貼面),浸漬紙(浸漬紙、原紙)進行自然光和紫外光輻照試驗,使用分光光度計、傅里葉紅外光譜儀、電子自旋共振波譜儀進行檢測尋找其變色規(guī)律及引起變色的誘因；同時,使用紫外分光光度計觀察并測試清漆等薄膜的透射光譜。本研究旨在為研究木質材料表面光變色提供基礎實驗依據。主要研究結果如下： 1.椴木單板、裝飾浸漬紙和PVC貼面受到自然光和紫外光照射后變色的普遍規(guī)律是：材料受到紫外光照射引起的變色明顯,主要表現(xiàn)是明度指數(shù)下降,紅綠軸色品指數(shù)變化不明顯,黃藍軸色品指數(shù)增加,視覺顯示黃變；自然光輻照的效果明顯小于紫外光,但變色規(guī)律基本一致；色差變化主要發(fā)生在照射最初階段,然后變化趨于穩(wěn)定的飽和狀態(tài),紫外光的長時間輻照又能引起顏色的較大變化。 2.使用傅里葉紅外光譜儀檢測椴木單板光輻照后顏色的改變主要是來自于木質素和抽提物氧化降解的緣故,隨著照射時間的增加,高聚物氧化降解,分子鏈斷裂生成類似于羥基、酮基或醛基為主的含氧基團,光輻照初期反應激烈變化大,之后光反應速度減緩量子產率下降。 3.生物質裝飾材料受到光輻照后碳氧自由基濃度有明顯改變,照射初期自由基濃度迅速增長,之后保持一段時間穩(wěn)定,然后繼續(xù)增加�？傮w上隨著照射時間增加碳氧自由基濃度增大,自由基濃度變化規(guī)律與色差變化規(guī)律完全一致,生物質裝飾材料在光照后生成的碳氧自由基可能是顏色改變的誘因之一。 4.在光輻照作用下,深色PVC貼面表面顏色變化較小是由于受到表面印刷顏料的掩蓋；木紋紙與浸漬紙原紙幾乎沒有發(fā)生變色現(xiàn)象,是由于原紙在生產過程中添加了大量鈦白粉所致。浸漬紙的變色主要是表面浸漬樹脂變色所引起的,浸漬紙表面樹脂在紫外光輻照后對光的選擇吸收性發(fā)生變化；透射率改變,表面呈現(xiàn)的顏色出現(xiàn)變化。
[Abstract]:The commonly used surface decoration materials: Wood grain paper / PVC veneer (dark veneer, light color veneer), impregnated paper (impregnated paper, base paper) were tested by natural light and ultraviolet light irradiation. Spectrophotometer and Fourier infrared spectrometer were used. Electron spin resonance spectrometer (ESR) was used to detect the discoloration law and cause the discoloration. At the same time, the transmission spectra of varnish and other thin films were observed and measured by ultraviolet spectrophotometer. The purpose of this study is to provide a basic experimental basis for the study of photochromic surface of wood materials. The main findings are as follows: 1. The general rule of discoloration of Linden veneer, decorative impregnated paper and PVC veneer after being irradiated by natural and ultraviolet light is that the color change caused by ultraviolet light is obvious, the main manifestation is the decrease of brightness index, but the change of color index of red and green axis is not obvious. The color index of the yellow blue axis increased, and the vision showed yellowing. The effect of natural light irradiation was obviously less than that of ultraviolet light, but the color change law was basically the same. The color difference mainly occurred in the initial stage of irradiation, and then the change tended to be stable and saturated. Ultraviolet light irradiation for a long time can also cause great changes in color. 2. Fourier transform infrared spectroscopy (FTIR) was used to detect the change of color after light irradiation of Linden veneer was mainly due to the oxidative degradation of lignin and extractives. With the increase of irradiation time, the degradation of polymer oxidized and the formation of molecular chain breaks similar to that of hydroxyl group. In the oxygen-containing groups with ketone or aldehyde group, the initial reaction changed greatly, and then the rate of photoreaction slowed down the quantum yield. 3. The concentration of carbon and oxygen free radical increased rapidly at the beginning of irradiation, then remained stable for a period of time, and then continued to increase. As a whole, with the increase of irradiation time, the change of free radical concentration is consistent with that of color difference. The carbon and oxygen free radical produced by biomass decoration materials after illumination may be one of the inducements of color change. 4. Under the action of light irradiation, the color change of dark PVC veneer surface is small because it is covered by surface printing pigment, and there is almost no discoloration between wood grain paper and impregnated paper base paper. This is due to the addition of a large amount of titanium dioxide to the base paper during the production process. The discoloration of impregnated paper is mainly caused by the discoloration of the surface impregnated resin. The selective absorption of the impregnated paper surface resin changes after UV irradiation, and the color of the surface changes with the change of transmittance.
【學位授予單位】：東北林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TU564

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