Chemical Modification of Sugi wood and Broad-leaved tree woods of low quality-Development of materials for exterior use and furniture-

低品质杉木和阔叶木的化学改性-室外材料和家具材料的开发-

• 批准号: 06556031
• 负责人: HIGUCHI Mitsuo
• 金额: $ 6.91万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06556031/
• 关键词: Sugi wood; Chemical modification; Impregnation with phenolic resin; Outdoor uses; Furniture; Dimensional stability; Hydroxymethylation of phenol; Reaction kinetics; フェノール樹脂; 樹脂注入; エクステリア材

Impregnation of wood with phenolic resin was investigated with the object of developing uses of Sugi and other woods of low quality.Neutral or weakly acidic aqueous solution of hydroxymethylphenol monomers which contains little amounts of free phenol, formaldehyde and condensation products is desirable for the improvement of wood. The resins which have been provided by resin makers are not good for the purpose. It needs to establish reasonable reaction procedures for the synthesis of hydroxymethylphenol monomers. Therefore, reaction kinetics of the hydroxymethylation of phenol under the catalysis of sodium hydroxide was investigated. The seven reactions taking place competitively in the process of hydroxymethylation of phenol were analyzed by use of a computer simulation technique, and rate constants and energies of activation for the seven reactions were determined. The result indicates that free (unreacted) phenol decreases as the NaOH/phenol molar ratio increases and as the reaction temperature is lowered.Impregnation of Sugi columns and squares with a neutral 10% aqueous solution of hydroxymethylphenol monomers effectively suppressed the cracking after drying and heating. Fences and benches were manufactured for trial and were exposed to out-doors. There are no problem so far. Face-layr densified Sugi squares impregnated with the resin are light in weight and have sufficient hardness. The use as table tops is expected.

为了开发杉木等低品质木材的用途，对酚醛树脂浸渍木材进行了研究，发现含有少量游离苯酚、甲醛和缩合产物的羟甲基苯酚单体的中性或弱酸性水溶液是改善木材性能的理想选择。树脂制造商提供的树脂并不适用于此目的。合成羟甲基苯酚单体需要建立合理的反应程序。为此，对氢氧化钠催化苯酚羟甲基化反应动力学进行了研究。利用计算机模拟技术对苯酚羟甲基化过程中相互竞争发生的7个反应进行了分析，确定了7个反应的速率常数和活化能。结果表明，随着NaOH/苯酚摩尔比的增加和反应温度的降低，游离(未反应)苯酚的量减少。用10%的中性羟甲基苯酚单体水溶液浸渍Sugi柱和正方形，有效地抑制了干燥和加热后的开裂。栅栏和长凳是为试验而制造的，并暴露在户外。到目前为止，没有任何问题。浸渍树脂的表面致密的Sugi方块重量轻，具有足够的硬度。预计将被用作桌面。