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Performance of nano-TiO_2 modified ACQ preservative treated wood

YU Lili;CAI Jie;TANG Zhenzhong;ZHU Junyan;ZHU Lizhi;MA Xiaojun;Department of Packaging and Printing Engineering,Tianjin University of Science and Technology;Timber Value Promotion and Substitution Administration Center;  
【Objective】Alkaline copper quat(ACQ)preservative was modified by nano-TiO_2 with excellent aging resistance and broad spectrum bactericidal ability to improve the comprehensive properties of the treated wood.【Method】The dispersion efficiency was used as evaluation index to investigate the ideal dispersion conditions of nano-TiO_2 dispersion into ACQ solution by the orthogonal test.The copper leaching performance and the compression strengths parallel to grain and perpendicular to grain of ACQ treated wood with different treatments were investigated,and the changes of the chemical structure of the treated wood were analyzed by FTIR spectrum analysis.【Result】The ideal modification conditions for nano-TiO_2 dispersed into ACQ solution were 0.6% of ACQ mass fraction,0.05 g of nano-TiO_2 mass,1:5 of the ratio between nano-SiO_2 and sodium hexametaphosphate,40 ℃ of ultrasonic temperature,and 60 min of ultrasonic time.The factors were in the decreasing order of mass of nano-SiO_2 ratio between nano-SiO_2 and sodium hexametaphosphateACQ mass fraction ultrasonic temperatureultrasonic time.Compared to the ACQ treated wood,nano-TiO_2 modification was critical for improving the compression strengths paral-lel to grain and perpendicular to grain of ACQ treated wood,and the copper leaching resistance.The compression strengths parallel to grain and perpendicular to grain were increased to 5.98 and 48.4 MPa,respectively.The chemical reactions between nano-TiO_2 and wood constituents were hemicellulose and lignin,and the ideal dispersion mass fraction for ACQ preservative was between 0.6%-0.8% observed by FTIR spectrum.【Conclusion】Nano-TiO_2 modified ACQ treated wood were successfully prepared.
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