缺氧高温热处理与热固型树脂/硅溶胶复合改性剂浸注处理协同改性木材机理研究

针对木材改性剂渗透性差、功能单一、改性材韧性差等问题，项目拟选用硅溶胶增韧热固型树脂，构建具有互穿网络结构的热固型树脂/硅溶胶复合改性剂，通过缺氧高温处理与复合改性剂浸注处理协同处理改性木材；研究硅溶胶粒径、pH值、温度等对热固型树脂/硅溶胶复合改性剂流变性的影响规律；构建复合改性剂流变性与其渗透性、稳定性及固化后韧性的关系；实现热固型树脂/硅溶胶复合改性剂可控制备；通过FTIR、XRD、13C NMR、29Si NMR、TG、DMA、DSC、SEM和剖面密度等测试分析手段，探究木材复合改性剂在木材中存在位置、与木材的结合方式，明确缺氧高温处理与复合改性剂浸注处理协同作用对木材微观结构和物化性能的影响；建立协同改性与改性材性能的关系；确定协同改性的较佳工艺；揭示缺氧高温处理与热固型合成树脂/硅溶胶改性剂浸注处理协同改性木材的机理。为人工林木材高效、高附加值利用提供实验依据和理论指导。

In view of the problems of poor permeability of wood modifier, single function and poor toughness of modified material, in this proposal, we focus on toughening thermosetting resin through silica sol and will build a thermosetting resin/silica sol composite modifier with interpenetrating network structure. The wood will be treated by combined high-temperature heat treatment with composite modifier impregnation treatment. The effects of silica sol particle size, pH value and temperature on the rheological properties of thermosetting resin/silica sol composite modifier will be studied. The relationship between rheological properties of composite modifier and its permeability, stability and post-curing toughness will be established. The controllable preparation of thermosetting resin/silica sol composite modifier will be achieved. Through testing and analyzing means such as FTIR, XRD, 13C NMR, 29Si NMR, TG, DMA, DSC, SEM and profile density, we will explore the position of wood composite modifier inner wood and the combination mode with wood, and determine the synergistic effect of high-temperature heat treatment and composite modifier infusion treatment on wood microstructure and physicochemical properties. The relationship between cooperative modification and properties of modified materials will be established. The optimum process of synergetic modification will be determined; the mechanism of synergistic wood modification by combined high-temperature heat treatment with impregnation treatment with thermosetting synthetic resin/silica sol modifier will be revealed. The results of the research will provide experimental basis and theoretical guidance for high efficiency and high added value utilization of wood in plantation.