Cure Kinetics of Powdered Phenol-Formaldehyde Resins with Wood Preservatives: Ammonium Pentaborate
Introduction The major obstacle of large scale using of borate as a wood preservative is their adverse effect on the mechanical and physical properties of wood-based composites bonded with phenol formaldehyde (PF) resins. It is thus important to study the chemical reaction of wood adhesives and borate during the hot-pressing process. The previous research indicated that the functional methylol groups (-CH2OH) on resin molecules reacted with borate ions and such interaction would cause the resin to gel before it is able to develop an effective bond. The latest research focused on the influence of biocides on the curing kinetics of PF resins. Yong Lei and Qinglin Wu studied the influence of zinc borate (ZB) on curing kinetics of PF OSB resins and investigated that ZB accelerated the addition reaction, however it delayed the entire cure reactions as the condensation reaction part was retarded. Up to date, there were no report about ammonium pentaborate (AP) used as wood preservative in wood based composites manufacturing. The specific objectives of this study were to determine the influence of AP on curing kinetics of PF resins using differential scanning calorimetry (DSC) to predict curing reactions for the resin systems containing biocides.
Gao Wei Cao Jin-zhen Li Jian-zhang
Dept.Wood Science and Technology, Beijing Forestry University, Qinghua Eastroad 35, Haidian, Beijing,China 100083
国际会议
International Symposium on Wood Science and Technology(IAWPS 2008)(国际木材产品学会联合会2008学术研讨会)
哈尔滨
英文
363-364
2008-09-27（万方平台首次上网日期，不代表论文的发表时间）