Correlation of Adhesive Performance between Automated Bond Evaluation System Tests and Plywood Tests-A Case Study of Lignin-PF Adhesives

摘要

Automated Bond Evaluation System (ABES), which has become ASTM D 7998-15 standard test method recently, is an effective tool for screen-testing of different water-based wood adhesive formulations. This method enables rapid evaluations of mechanical responsiveness of different adhesive formulations to various press temperatures and/or press times, providing an efficient and realistic comparison of bondability and reactivity among the adhesive formulations. Based on extensive testing work, this paper provides experimental findings and evidences for the use of this method to evaluate bonding performance of lignin as a major ingredient in the phenolic adhesive system. The relationship between bond strength development and press temperature can be established for a particular adhesive formulation using this method, which can then help the formulation and optimization of a wood adhesive containing lignin. Softwood plywood experiments demonstrated that there is a strong correlation between ABES test results and adhesive performance in the panel products.