Researchers have developed a lignin-based resin that combines flame-retardant properties with adhesion, pointing to potential applications in wood coatings and adhesives.
In a study published in Green ChemistryGreen Chemistry, Wei Tan and colleagues describe a resin made by chemically modifying lignin and using glyoxal to build its polymer network. The authors describe the material, designated SALG-PR, as phosphorus-free and formaldehyde-free.
Laboratory tests demonstrated flame-retardant performance in both the resin and coated wood. The material also bonded to wood and aluminium, retaining more than 80% of its initial bond strength after repeated temperature cycling.
The researchers report only trace formaldehyde release during a thermal analysis compared with a commercial phenol-formaldehyde resin. This finding does not establish emissions performance for a finished coating under normal indoor conditions.
For the forest-products sector, the study highlights a potential route to higher-value lignin applications that combine bonding and protective functions. The reported results concern laboratory specimens; commercial-scale performance and suitability for specific end uses cannot be established from the information reviewed.
