Lignin-Based Adhesives for Wood Bonding

Date:08 August 2023

Country: China

Application

• Development of eco-friendly adhesives for plywood and wood-based products.

Description

This project explores a novel method for creating lignin-based adhesives for bonding wood by using uncondensed or slightly condensed lignins extracted from lignocellulosic biomass. The adhesives, prepared by mixing lignins with water, demonstrated excellent bonding strength for plywood at various hot-pressing temperatures. This approach offers a sustainable alternative to traditional wood adhesives, such as urea–formaldehyde and phenol–formaldehyde resins, by utilizing biomass-derived lignin and avoiding the need for harsh chemical treatments. The method also shows potential for industrial scalability and energy efficiency.

 

 

Pathway Description:

The process used in this project involves isolating uncondensed or slightly condensed lignins from lignocellulosic biomass, such as eucalyptus wood. These lignins are then mixed with water to form a suspension, which is applied as an adhesive to wood veneers. The plywood is prepared by hot-pressing at various temperatures, where the lignin undergoes self-crosslinking to form strong bonds. The performance of the lignin-based adhesive is optimized by adjusting the condensation degree and hot-pressing conditions.