The Preparation and Application of a New Formaldehyde-free Adhesive for Plywood
Technical Paper - In this study, we developed a new formaldehyde-free adhesive prepared by in-situ chlorinating graft copolymerization for plywood. The main ingredients of this adhesive include maleic anhydride (MAH) and high density polyethylene (HDPE) that is MAH grafted onto HDPE (PE-cg-MAH). The reaction between this adhesive and veneer, the optimum formulation to bond veneer and the optimum hot-press conditions to prepare the plywood were investigated. A boiling water test was employed to evaluate the strength and water resistance of plywood bonded with this adhesive. The results showed that the properties of the resulting plywood using PE-cg-MAH as an adhesive can meet the standard of Type I plywood and the optimum hot-press conditions were 160?165 °C and 5 min. When the chlorine contents of PE-cg-MAH was about 3% (wt%) the plywood panels had a higher shear strength after boiling water test above the hot-press conditions.
Source : Liang Tanga, Zhao-gang Zhangb, Jiao Qib, Ji-ruo Zhaob, and Ying Fengb a College of Automation Electronic Engineering, Qing Dao University of Sci. & Tech., Qing Dao 266042, China b Key Laboratory of Rubber-Plastics, Ministry of Education / Shandong Provincial Key Laboratory of Rubber-Plastics, Qing Dao University of Sci. & Tech., Qing Dao 266042, China Accepted 15 April 2011. Available online 23 April 2011.
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