Synthesis And Application Of Resins Based On Liquefied Product From Branch Of Fraxinus Chinensis Roxb In The Mixed Donor Solvents

In order to reuse the branch of wood, the branch of Fraxinus chinensis Roxb was liquefied in the Petralin-Tetralin mixed Hydrogen-Donor solvent. We carry out the research, untilizing the orthogonal. we have obtained optimum liquefaction processing parameters,resin processing parameters and hot-press processing parameters. Changes of groups and mechanism of reaction were analysed by FTIR and SEM; The result is as follows:1)The reaction conditions are temperature of 150℃,the reaction time of 2.5h,liquid radio(pHonel/wood weight ratio) of 6, Tetralin content of 20% and catalyst content of 6.5%,.4% residue could be reached. the reaction time plays the most important role in all factors, followed by reaction temperature, liquid ratio,catalyst content and tetralin content. the more we pick out the liquefaction processing parameters, except catalyst content, the less residue ratio can be reached. The best effect manufacturing the liquefied wood is the time which human spend in the whole process.2) The reaction best temperature, making the proper resin, is 82℃,. and the best time is 140min. As the same time, the NaOH/liquefied wood molar ratio is 0.3, and the pHonel/liquefied wood molar ratio is 1.9.3) we want to get the best bond strength of plywood, the hot-press processing parameters is that the temperature is 165℃, and the pressure is 1.4MP,and the time is 6min. Finally you need to paint 290 g/m-2 resin in the board. The best bond strength is 1.77MPa.4) Analyzing paints of FTIR of liquefied wood resin, which was similar to the traditional PF resin of the chemistry character. crystal lattice of crystal was destroyed; hemicelluloses ans lignin were deteriorated to the low molecule. Studying the picture of the SEM about the liquefied wood resin and the traditional PF resin, we find the traditional PF have the more fine substance.