液化相思樹木材製備酚甲醛樹脂膠合劑

Phenol-Formaldehyde Resin Adhesives Prepared from Liquefied Acacia confusa Wood

李文昭(Wen-Jau Lee) ； 劉正字(Cheng-Tzu Liu) ； 侯家翔(Chia-Hsiang Hou)

《林產工業》 23卷1期 (2004/03) Pp. 43-53

https://doi.org/10.6561/FPI.2004.23(1).5

摘要

本研究將相思樹木材在酚液體中以H_2SO_4及HC1做為催化劑進行液化處理，並探討液化木材製備PF樹脂之可行性。由試驗結果得知，以H_2SO_4為催化劑者有較佳之液化效果，其殘渣率較低，不揮發分較高。液化木材所製備PF樹脂之黏度及膠化時間受木材液化條件及樹脂合成條件所影響，以H_2SO_4做為催化劑之液化木材所製備之PF樹脂具有較高之粘度與較短之膠化時間。由DSC熱分析結果顯示，液化時以HC1做為催化劑之液化木材與甲醛具有較高之反應性。由膠合強度測定結果顯示，HC1做為催化劑之液化木材所製備之PF樹脂膠合劑應用於含恨製造時，其常態、溫水浸水及反覆煮沸浸水之膠合強度均可達CNS 1349號標準中最值7.0 kgf/cm^2以上之要求。以H_2SO_4做為催化劑之液化木材所製備PF樹脂之合板膠合強度則較低，且受熱壓條件影響，提高熱壓溫度，或延長熱壓時間均可增加合板之膠合強度。

關鍵字

液化木材 ； 酚化作用 ； PF樹脂 ； 木材膠合劑

並列摘要

Taiwan acacia (Acacia confusa) was liquefied in phenol with H_2SO_4 and HC1 as catalyst. The feasibility of PF resins prepared from liquefied wood was investigated. The results revealed that Taiwan acacia liquefied in phenol with H_2SO_4 had better liquefaction effect than that with HC1. Lower residue and higher nonvolatile were obtained by the former treatment. The properties of PF resins prepared from liquefied wood were depended on the conditions of wood liquefaction and resin preparation. PF resins prepared from liquefied woods with H_2SO_4 had higher viscosity and shorter gel time. Thermal analysis in DSC showed that liquefied wood with HC1 had higher reactivity than with H_2SO_4 when reacted with formaldehyde, The dry wet and repeated boiling water soaked bonding strength of plywood which made with PF resins those prepared from liquefied wood with HC1 as catalyst were better than those with H_2SO_4 as catalyst. The former had bonding strength greater than 7 kgf/cm^2, it's over the request in the standard of CNS 1349. However, the bonding strength of the latter was influenced by the hot-pressing conditions, and better bonding strength in plywood could be obtained by elevating press temperature or prolonging press time.

並列關鍵字

Liquefied wood ； Phenolation ； PF resin ； Wood adhesive