Current and Future Challenges of Bio-Based Adhesives for Wood Composite Industries

Traditional trialdehyde adhesives are the most prominent adhesives in wood industry, as well as they are also the main reason for the release of formaldehyde during the use of wood glue products such as wood-based panels. There is a growing demand for adhesives prepared with environment-friendly from biomass materials to transition toward a more sustainable society. The development and application of new promising adhesives not only involve resource reasonable utilization and environmental protection, but also have great significance to the profound development of adhesive industry. In this chapter, the characteristics, preparation technology, modification methods and current research progress of several bio-based adhesives (lignin, tannin, soybean protein and starch) are reviewed, the application status and the existing problems of bio-based wood adhesive are analyzed, and the development direction of bio-based wood adhesives is prospected.