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研究生:侯家翔
研究生(外文):Chia-Hsiang Hou
論文名稱:木材之液化及其在木材酚膠合劑之製造
論文名稱(外文):Preparation of PF Wood Adhesives from Liquefied Wood
指導教授:劉正字
指導教授(外文):Cheng-Tzu Liu
學位類別:碩士
校院名稱:國立中興大學
系所名稱:森林學系
學門:農業科學學門
學類:林業學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:57
中文關鍵詞:木材液化木材膠合劑熱硬化性
外文關鍵詞:liquefied woodwood adhesivethermosetting
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摘要
本研究乃探討杉木及相思樹木粉於酚液體中以酸(HCl及H2SO4)為催化劑進行液化處理之條件及效果,木材液化之變因包含酚/木材之重量比(P/W)、催化劑種類及液化時間。並進一步探究此液化木材全量應用於木材膠合劑製備之可能性。
由實驗結果得知,催化劑種類、液化時間及溫度對液化效果有決定性之影響,以H2SO4為液化反應之催化劑時,杉木在催化劑添加量5﹪、液化溫度130℃、液化時間60min時,其木粉幾已完全溶解;然相思樹在上述條件下則會產生膠化之現象。以HCl為催化劑時,兩種樹種在液化時間60min、催化劑添加量10﹪,液化溫度120℃時均有良好之液化效果,並且可進行較低液比(2/1)之木材液化。
木粉在酚溶液中進行液化反應時,有部分酚會與木材產生結合,其中以H2SO4為催化劑之液化木材其結合酚高於以HCl為催化劑者。
以H2SO4為催化劑之液化木材與甲醛反應所製備之液化木材膠合劑有較高粘度,較短膠化時間;其膠液行DSC熱分析時出現低溫側較明顯及高溫側但較平緩兩個放熱峰;以HCl為催化劑者其膠液粘度較低,膠化時間較長,其DSC熱分析時僅有一寬廣之放熱峰。
液化杉木及液化相思樹膠合劑之合板性質均以HCl為液化催化劑者較優,在P/W液比為3的液化條件下,液化木材所製備膠合劑之合板膠合強度均能達到CNS1349 一類合板之要求。其中以C-H-1在熱壓溫度135℃、熱壓時間5min時,有最佳之反覆耐沸水膠合強度15.6kgf/cm2。
SUMMARY
This study investigated the condition of liquefation of China fir (Cunninghamia lanceolata) and Tawain acacia (Acacia confusa) in phenol by acid(HCl and H2SO4) as catalyst. The variance changed in this study including weight ratio of phenol to wood, kind of catalyst and time of liquefaction.
Kind of catalyst, temperature and time of liquefaction were the most important factors influenced the effect of the liquefaction. If H2SO4 was used as catalyst with 5﹪concentration in phenol,the wood meal of China fir would almost completely dissolved after 60 minutes of liquefaction at reaction temperature of 130℃, but the liquefaction of Taiwan acacia would be curing at the same liquefied condition. If HCl was used as a catalyst with 10﹪concentration in phenol , it not only has good liquefaction efficiency after 60 minutes of liquefaction at reation temperature of 120℃, but also could liquefy at lower weight ratio of phenol to wood.
A part of phenol would combine with wood after the reaction of liquefaction. The liquefied wood using H2SO4 as a catalyst had larger amount of combined phenol than that using HCl as a catalyst.
Adhesive prepared from liquefied wood that used H2SO4 as a catalyst,had higher viscosity and short gel time, two exothermic peaks was observed in their DSC thermograms, one at lower temperature with sharp shape, the other at higher temperature with small and broad shape. Adhesive prepared from liquefied wood that used HCl as a catalyst, had lower viscosity and longer gel time, only one exothermic peak with flat and broad shape was observed in their DSC thermograms.
Adhesives prepared by liquefied wood using HCl as a catalyst had better bonding strength than using H2SO4 ,and could come up to the standard of CNS 1349 for type 1 plywood, when the P/W=3. In this study, when the hot-pressing temperature at 135℃ for 5 min,C-H-1 has the best bonding strength after repeated soaking in boiling water 15.6 kgf/cm2.
目錄
目錄…………………………………………………………………..I
表目次………………………………………………………………..II
圖目次………………………………………………………………..III
摘要…………………………………………………………………..VII
英文摘要……………………………………………………………..VIII
第一章 前言………………………………………………………..1
第二章 文獻回顧…………………………………………………..3
第三章 木材之液化處理及其性質……………………………….16
第一節 材料與方法……………………………………………16
第二節 結果與討論……………………………………………18
第四章 液化木材膠合劑之合成及其性質……………………….24
第一節 材料與方法……………………………………………24
第二節 結果與討論……………………………………………29
第五章 液化木材膠合劑之膠合強度……………………………..47
第三節 材料與方法…………………………………………….47
第四節 結果與討論…………………………………………….48
第六章 結論………………………………………………………..52
第七章 參考文獻…………………………………………………..54
第七章 參考文獻
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