- 期刊
柳杉之酚液化處理及其在Resol型PF樹脂製備之應用
Liquefaction of Cryptomeria Japonica with Phenol and Utilized in the Preparation of Resol Type PF Resins
摘要
本研究以柳杉(Cryptomeria japonica; Japanese fir)為試材，酚為液化藥劑，硫酸(H2SO4)及鹽酸(HCl)為催化劑，探討液化條件對柳杉木之液化效果，並以液化木材之殘渣率、粘度、不揮發分、結合酚和自由酚含量做為液化效果之指標。由試驗結果顯示，以H2SO4為催化劑者有較佳之液化效果，其液化木材之殘渣率較低，不揮發分及結合酚含量則較高。液化時酚／木材重量比較高者，其液化效果較佳，然酚／木材重量比降低至2/1亦可完成液化作用，但液化木材之粘度偏高。FT-IR分析顯示液化柳杉木與酚產生化學結合；GPC分析顯示以HCl為催化劑之液化木材之分子量分布範圍較寬廣。進一步將不同條件酚液化柳杉木應用於Resol型PF樹脂製備，以H2SO4為催化劑之液化柳杉木於PF樹脂合成過程中粘度增加較快速。合成時F/P之莫耳比2.0/1者在合成過程中粘度增加較莫耳比1.8/1者快速。各合成樹脂以DSC進行熱硬化分析顯示，以HCl為催化劑之液化柳木所製備之PF樹脂有較佳之反應性，且具備較佳之常態及耐水合板膠合強度。
並列摘要
Cryptomeria japonica was liquefied in phenol with H2SO4 and HCl as catalyst. The residue, viscosity, nonvolatile, combined phenol and free phenol in the liquefied wood were used as the evaluation factor for the liquefaction efficiency. The results showed that Cryptomeria japonica liquefied in phenol with H2SO4 as catalyst had better efficiency than with HCl, which had lower residue and higher nonvolatile and combined phenol. Liquefaction carried out with higher weight ratio of phenol to wood had better efficiency. As the weight ratio of phenol to wood was downed to 2/1, the liquefaction could still be completed, but the viscosity of this liquefied ryptomeria japonica wood was too high. The FT-IR spectrum showed that phenol could bond with the component of Cryptomeria japonica. The GPC analysis showed that the liquefied wood with HCl as catalyst had molecular weight distribution broader than with H2SO4. As the liquefied wood was used to prepare the resol type PF resin, the viscosity increasing was faster for liquefied wood that with H2SO4 as catalysis than that with HCl as catalyst at the period of PF resin preparation. Comparison between the F/P molar ratio of 2.0/1 and 1.8/1, the former had viscosity increasing faster than the latter. The PF resins prepared from liquefied wood that with HCl as catalyst had higher reactivity showed from the DSC thermal analysis, and had better normal and wet bonding strength for plywood.
延伸閱讀
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