Fixation of boric compound into wood and its influence on the biological resistance

• Project/Area Number: 06660213
• Research Category: Grant-in-Aid for General Scientific Research (C)
• Allocation Type: Single-year Grants
• Research Field: 林産学
• Research Institution: KYOTO UNIVERSITY
• Principal Investigator: TAKAHASHI Munezoh Wood Research Institute., Kyoto Univ.Professor, 木質科学研究所, 教授 (10027162)
• Co-Investigator(Kenkyū-buntansha): YOSHIMURA Tsuyoshi Wood Research Institute., Kyoto Univ.Instructor, 木質科学研究所, 助手 (40230809)
• Project Period (FY): 1994 – 1995
• Project Status: Completed(Fiscal Year 1995)
• Budget Amount: ¥2,000,000 (Direct Cost : ¥2,000,000); Fiscal Year 1995 : ¥600,000 (Direct Cost : ¥600,000); Fiscal Year 1994 : ¥1,400,000 (Direct Cost : ¥1,400,000)
• Keywords: Boric compound / Boric acid / Leaching resistance / Wood-Inorganic Material Composite / Furfurylalcohol / Phenol-resin / Decay resistance / Termite resistance / フェノール樹脂 / 耐侯操作 / 樹脂 / 防腐性能 / 防蟻性能 / 木材腐朽菌 / シロアリ

Research Abstract

1 The addition of boric acid at least into the second anion solution improved the biological resistance of wood-inorganic material composites (WIC). Although boric acid is easily leached out from wood in its single treatment, some amount of boric acid remained as an inorganic borate when incorporating the anion solution for WIC production. Inorganic borate and free boric acid aid the effect of deposition of water-insoluble barium hydrogenphosphate in supressing biological attacks.
2 Over 25% weight increase (WI) was required to eliminate the biological attacks of wood. Boric acid pretreatment greatly enhanced the biological resistance of furfurylalcohol-treated wood at less than 5% WI.The enhanced biological resistance might be due to embedding of boric acid into the heat-cured furan resin.
3 Boric acid pretreatment of wood chips also improved the biological resistance of phenol resin-impregnated particleboard. This also might be embedding of boric acid into the heat-cured phenol resin.

Research Products

• [Publications] KIRITA. S.: "Influence of Boric Acid Addition on the Biological Resistance of Wood-Inorganic Composites by Double Diffusion Treatment" Wood Research. No.81. 25-27 (1994)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] TOYOSHIMA, I.: "Effect of Boron Compounds on Physiological Function in Termite" Wood Research. No.82. 37-39 (1995)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] TAKAHASHI, M.: "Chemical Modification of Lignocellulosic Materials" Marcel Dekker, 370 (1996)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] KIRITA,S: "Influence of Boric Acid Addition on the Biological Resistance of Wood-Inorganic Composites by Double Diffusion Treatment" Wood Research. No.81. 25-27 (1994)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] TOYOSHIMA,I.: "Effect of Boron Compounds on Physiological Function in Termite" Wood Research. No.82. 37-39 (1995)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] TAKAHASHI,M.: "Marcel Dekker" Chemical Modification of Lignocellulosic Materials. 370 (1996)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] KIRITA, S.: "Influence of Boric Acid Addition on the Biological Resistance of Wood-Inorganic Composites by Double Diffusion Treatment" Wood Research. No. 81. 25-27 (1994)
• [Publications] TOYOSHIMA, I.: "Effect of Boron Compounds on Physiological Function in Termite" Wood Research. No. 82. 37-39 (1995)
• [Publications] TAKAHASHI, M.: "Chemical Modification of Lignocellulosic Materials" Marcel Dekker, 370 (1996)
• [Publications] KIRITA,S.: "Influence of Boric Acid Addition on the Biological Resistance of Wood-Inorganic Composites by Double Diffusion Treatment" Wood Research(Bull.Wood Research Institute Kyoto University). NO.81. 25-27 (1994)