Study On Liquefaction Of Chinese Fir Wood Meals And Chinese Fir Wood Meals/SiO₂ Hybrid Ceramic Material

Chinese Fir was one of fast-growing trees with valuable timber attributes, which was widely cultivated in our country. Because of the technique, the utilization rate of the timber processes surplus thing was very low, which not only result in to waste but also influence to the environment creation. The comprehensive utilization of Chinese Fir was increased by the method of liquefaction and hybrid using Chinese Fir wood meals as raw material.The work in this paper included:1. There search focus on the liquefaction of Chinese Fir wood meals by phenol in the presence of sulfuric acid used as catalyst. The effects of reaction temperature, liquid ratio (weight ratio of phenol-to-wood) and catalyst on the reaction efficiency of liquefaction were investigated. The results show that the residue contents of liquefied Chinese Fir wood meals decreased and the rate of liquefaction improved with increasing reaction temperature. Residue contents of liquefied products were more sensitive in the lower liquid ratio. Residue contents of liquefied products were remarkably decreased with raised liquid ratio from 0.5 to 1.5. Residue contents of liquefied products were more decreased with increasing concentration of catalyst in the low ranges(0.5%-2%).2. Phenolic resin was prepared by the method of two-stage process using liquefied products as raw material. The effects of residue contents of liquefied products on properties of the PF resin were investigated. The results show that the viscosity of the resins increased with the improving residue contents of liquefied products. On the contrary, the solid contents decreased with the improving residue contents of liquefied products. Properties of the PF resin were good, when the residue contents of liquefied products was lower.3. The Chinese fir wood meals /SiO₂ hybrid material was prepared by the method of sol-gel using TEOS as inorganic medium and china fir wood meals as raw material, according to the principle of solvothermal method. The structure and property of the hybrid material were analyzed by FTIR, XRD, TGA and SEM respectively. The results show that the WPG (weight percent gain) of the wood gets a marked improvement and the hydroxyl groups from the hydrolysis of TEOS reacted with the hydroxyl groups of the wood. In SEM analysis, the network whose size is in nanoscale is found , which resulted from the coagulation of Si-O-C network. And in XRD analysis, the crystalline phase of lignocellulose has been destroyed. Meanwhile, the crystallinity decreases. The hybrid material has a better thermostability and worse water absorbency.4. The woodceramics was prepared by the method of carbonization under vacuum using china fir wood meals as raw material. The structure of the woodceramics were analyzed by FTIR, XRD, and SEM respectively. The results show that the woodceramics with porous structure was made up of SiO₂ and C and its average aperture was 140μm. With the increase the content of SiO₂ in the hybrid materials and carbonization temperature, the content of tetragonal lattice of SiO₂ increased.