The preparation and application of a new formaldehyde-free adhesive for plywood

Published Date
September 2011, Vol.31(6):507–512, doi:10.1016/j.ijadhadh.2011.04.005

Author 

• Liang Tang ^a
• Zhao-gang Zhang ^b
• Jiao Qi ^b
• Ji-ruo Zhao ^b,,
• Ying Feng ^b

• aCollege of Automation Electronic Engineering, Qing Dao University of Sci. & Tech., Qing Dao 266042, China
• bKey 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. 

Abstract

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.

Keywords

In-situ chlorinating graft copolymerization

Adhesives for wood

Novel adhesives

Polyolefins

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