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The Study of Modification of Wood Fibers by Sol-gel Technology and Performance of Fiberboard

Author: CaoWenJing
Tutor: XuLi
School: Nanjing Forestry University
Course: Materials Science
Keywords: Sol - gel Boric acid Phosphate Poplar fiber Modified
CLC: TS653.6
Type: Master's thesis
Year: 2011
Downloads: 39
Quote: 0
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Abstract


The fast-growing plantation poplar wood is soft, easy to burn, low hardness, poor poor dimensional stability and wear resistance shortcomings limit the scope of its use. This paper presents the sol - gel technology, analog or improve the natural bio-composite material, design and control of material structure and composition of the nanometer or cellular level, high performance at low temperatures. This thesis is different from the conventional method for modifying, through in the timber Nano voids, intracellular introduction of sol, to gather at a particular location, and the reaction, to eliminate or reduce the polar group, thus fundamentally solve the long plagued timber scientists this problem. Through research, the following conclusions can be drawn: 1) cheap ferric chloride prepared from ferric hydroxide sol modified poplar fiber. Analysis by infrared spectroscopy and thermogravimetric test results show that the iron oxide - poplar fiber composites compared with unmodified poplar fiber hydrophilic ability greatly reduces the thermal stability is improved. It can be concluded that the sol - gel technology poplar fiber modification. 2) TEOS precursor and boric acid as additives, the preparation of silicon / boron sol modified poplar fiber results show: When H2O: TEOS molar ratio equal to 10, the particle size of sol 1.794nm fiber weight gain rate, spectrum analysis into the mass fraction of the cell wall of Si in the nano-pores of 3.79%. FTIR spectra analysis indicated that the the hydroxyl condensation on the silicon / boron sol fiber. TG curve shows the silicon / boron sol modified poplar fiber composite material has a good thermal stability. 3) the performance of the silicon / boron sol modified poplar fiberboard has reached the national standard. CONE experiment and anti-corrosion experiments showed that the silicon / boron sol modified poplar fiberboard has good flame retardant properties, resistance to white rot and brown rot resistance. 4) TEOS precursor, phosphoric acid and phosphate additives, preparing a silicon / phosphorus modified sol on poplar fiber, Results Showing: when H2O: of TEOS molar ratio is 30, the solvent is a particle diameter of 1.720nm, fiber weight gain. EDS analysis shows that to add a greater amount, the mass fraction of Si 1.33%, the mass fraction of P is 1.07% dipotassium hydrogen phosphate sol into the fiber cell wall. FTIR spectra analysis indicated that the the hydroxyl condensation of silicon / phosphorus sol fiber. TG curve shows the silicon / phosphorus sol modified poplar fiber composite material has a good thermal stability.

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CLC: > Industrial Technology > Light industry,handicrafts > Wood processing industry,furniture manufacturing industry > Processing > Wood-based panel production > Fiberboard
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