High-Consistency Lignin Nanoparticles for High-Performance Phenol-and Formaldehyde-Free Adhesives

The quest for sustainable materials has steered significant interest towards lignin, a major component of wood and a byproduct of the pulp and paper industry, as a potential resource for developing eco-friendly adhesives. This study focuses on the nanoengineering of lignin to create high-performance, phenol- and formaldehyde-free adhesives, addressing fundamental challenges in the handling, and processing of lignin for industrial applications.<br/> <br/>We have developed a novel method to synthesize high-consistency lignin nanoparticles in a water-based system, enhancing their adhesive properties without the need for chemical modifications. The resultant lignin-based adhesives exhibit superior mechanical strength, thermal stability, and water resistance, positioning them as viable alternatives to traditional petroleum-based adhesives. Additionally, this system allows for high lignin loading and good penetration into the wood, making it suitable for producing plywood prototypes.<br/> <br/>We analyze the mechanical properties of lignin-based adhesives and also study how they interact with wood substrates to understand their performance. We have successfully produced this scalable solution at a scale of 5 kg.<br/> <br/>The development of lignin-based adhesives not only helps reduce the carbon footprint but also promotes the efficient use of lignin, supporting the principles of a circular bioeconomy. Our approach integrates green and energy-efficient processing methods to ensure the sustainability and scalability of lignin-based adhesive production. <br/> <br/>This research is part of the TREECURE project, aiming to develop 100% bio-based adhesives free from formaldehyde and phenol, promoting environmental sustainability and safe built environments. TREECURE project has received funding from the Knut och Alice Wallenbergs Stiftelse under the Wallenberg Launch Pad (WALP) Proof-of-Concept initiative.