Research on the Preparation Process and Binding Performance of the Oxidation Modified Industrial Lignin-Wood Fiber Composite Material | 改性工业木质素-木纤维复合材料制备工艺及结合性能表征

Chinese. 木质纤维为基体,Fenton试剂化学改性后的工业木质素为黏结相,采用＂高速混合-平板热压＂的工艺技术路线制备环保型木质基复合材料。采用正交试验设计及极差分析,探索性能优良的环保型材料的制备工艺,通过傅里叶变换红外吸收光谱（FTIR）、X射线衍射分析（XRD）、动态热机械分析（DMA）、环境扫描电镜（SEM）对材料的化学组分、聚集态结构、动态热机械性能以及微观形貌特征进行表征。结果表明：1）在氧化改性工业木质素填加量25%、板坯含水率20%、热压时间7min、热压温度170℃的工艺条件下,木质基复合材料的理化性能能够满足GB/T11718―2009中干燥状态下使用的普通型中密度纤维板（MDF-GPREG）的要求;2）氧化改性工业木质素与木质纤维在热压过程中形成了较理想的化学键结合;木质纤维素的晶形结构保持不变,相对结晶度有所提高;复合材料的刚度和韧性良好,热稳定性降低;复合材料组分之间分布均匀,交织致密,界面相容性良好。该材料在建筑隔板、木质装饰板、产品包装等领域具有广阔的应用前景。

English. This article reports a study on an environmental friendly composite material. The composite material was produced from the wood fiber as the basic phase and industrial lignin oxidized modification by Fenton reagent as bonding phase. The optimal process parameters of the modified industrial lignin-wood fiber composite material by adopting high speed mixed-flat of hot pressing process are obtained as adding amount of oxidation modified industrial lignin 25% ,the moisture content of slab 20% ,hot pressing time 7 min and hot pressing temperature 170 ℃ according to orthogonal test and range analysis. The mechanical properties of materials reach the standard of GB / T 11718―2009 MDF of China. The changes of composite materials on the chemical composition,crystal form and crystallinity,dynamic mechanical properties and microstructure were characterized by means of Fourier transform infrared spectroscopy （ FTIR ）,X-ray diffraction （XRD）,dynamic thermomechanical analysis（DMA） and scanning electron microscopy（SEM）. The results showed that the modified industrial lignin and wood fiber formed ideal chemical bonds combination during the hot-pressing process, crystal structure of wood fiber remains unchanged but relative crystallinity improved. The stiffness and toughness of the composite material were good but the heat stability reduced,components of the composite material distributed evenly, intertwined closely and interfacial compatibility is good. The materials own a widely application prospect in architectural clapboard materials,decoration materials,packaging materials and so on.