Facile preparation of lac terpene acid based heat setting adhesive with improved performances.

As a by-product of shellac resin, the high-value utilization of lac terpene acid (LTA) is a major challenge. In this study, a novel adhesive material, designated as A-LTA, was developed through a facile synthesis reaction between LTA and melamine, demonstrating significantly enhanced performance characteristics. The A-LTA adhesive, owing to its diverse functional groups, demonstrates exceptional cross-linking and polymerization capabilities under elevated temperatures, resulting in the formation of multiple chemical bonds and a highly dense network structure. This unique molecular architecture endows the material with remarkable adhesion properties, exhibiting high adhesive strength and bending strength across various substrates, including steel, aluminum, glass, bamboo, and poplar, within a broad temperature range. Its adhesive performance was superior to commercially available section adhesives, and its adhesive strength increased from 1.95 to 11.15 MPa compared to LTA. Furthermore, A-LTA maintained a robust and effective adhesion under harsh environments, demonstrating exceptional resistance to acid, alkali, water, organic solvents and low-temperature. These superior characteristics position A-LTA as a promising multifunctional adhesive with substantial potential for industrial applications and sustainable development.