Abstract: 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.

Key words: industrial lignin, oxidation modification, composite materials, process parameters, characterization of performance