酚液化孟宗竹材製造Resol型水溶性PF樹脂

Manufacturing of Resol Type Water Soluble Phenol-Formaldehyde Resins from Phenol Liquefied Moso Bamboo

陳奕君(Yi-Chun Chen) ； 李文昭(Wen-Jau Lee) ； 劉正字(Cheng-Tzu Liu)

《林產工業》 25卷3期 (2006/09) Pp. 249-258

https://doi.org/10.6561/FPI.2006.25.(3).8

摘要

本研究以酚為液化藥劑，H_2SO4_及HCI為催化劑對孟宗竹（phyllostachys pubesens）進行液化處理，所得酚液化孟宗竹進一步與甲醛反應製備Resol型水溶性PF樹脂，探討樹脂合成時液化竹材之性質及採用甲醛／酚之莫耳比對所得酚樹脂性質之影響。由試驗結果得知，各條件極化竹材與甲醛反應所製PF備樹脂中未反應甲醛含量皆在0.25%以下，顯示液化竹材可充分與甲醛反應。兩種催化劑液化竹材比較，以H_2SO_4為催化劑之液化竹材在PF樹脂合成過程中之黏度增加快速，達設定樹脂液粘度所需合成時間較短，且PF其樹脂之膠化速度較快。在相同條件下，合成時甲醛／酚莫耳比較高者，合成反應過程之粘度增加較快速。PF樹脂之DSC熱分析顯示，以HCl為催化劑之液化竹材所製備PF樹脂之反應性優於以H_2SO_4為催化劑者。將液化孟宗竹所製備之Resol型水溶性PF樹脂應用於合板膠合時，以液化時酚／竹材重量比3/1，HCl為液化催化劑，合成時甲醛／酚莫耳比1.7/1者有較佳之合板膠合強度。

關鍵字

膠合強度 ； 液化竹材 ； 孟宗竹 ； 醋 ； PF樹脂

並列摘要

Moso bamboo tphyllostachy pubesensy was liquefied in phenol with the H_2SO_4 and HCI as catalyst. The liquefied Moso bamboos were used to react with formaldehyde to prepare the resol type water soluble PF Resins. The effects of the liquefaction condition of the liquefied bamboo and the molar ratio of formaldehyde to phenol used for the resin preparation on the properties of PF resins were investigated. The results showed that the liquefied bamboo could react adequately with formaldehyde, the unreacted formaldehyde in all PF resins was below 0.25%. Comparison the viscosity increasing rate between the liquefied bamboos that liquefied with H_2SO_4 and HCI as catalyst at the period of PF resin synthesis, the former was faster than the latter. PF resin prepared with the liquefied bamboo that with H_2SO_ 4 as catalyst needed shorter time to reach the setting viscosity and had fast gel speed. Under the same condition, PF resins prepared with the higher molar ratio of formaldehyde to phenol had faster viscosity increasing rate at the period of resin synthesis. DSC thermal analysis showed that the PF resins prepared with liquefied bamboo that with HCI as catalyst had reactivity higher than the liquefied bamboo that with H_2SO_4 as a catalyst. As the PF resins prepared from liquefied bamboo were used in the manufacturing of plywood, liquefaction with the weight ratio of phenol to bamboo at three to one, and using HCI as a catalyst, and synthesis with the molar ratio of formaldehyde to phenol at 1.7 to 1 had the better bonding strength.

並列關鍵字

Bonding strength ； Liquefied bamboo ； Phyllostachy pubesens ； Phenol ； PF resin