Gum Rosin Properties Upgrading as Water Dispersed Tackifier for Wet Adhesive and Pressure Sensitive Adhesive (PSA)
Abstract
In this research, gum rosin, as one of the non-wood forest products obtained from the resin tapping of pine trees, is modified by applying a modification process consisting of an esterification reaction with glycerol, a Diels-Alder reaction using maleic anhydride, and further esterification with polyethylene glycol 400 (PEG-400) to make it more stable to oxidation. It has a lower softening point and viscosity, making it suitable for use as a tackifier to enhance the tackiness of renewable, eco-friendly adhesives based on natural rubber/latex. Pressure-sensitive adhesives (PSA) and wet glue were produced using natural rubber as the elastomer and a mixture of modified gum rosin and water as the tackifier, with various compositions. It is found that PSA and wet glue produced with a tackifier-latex ratio of 30:70 and a gum rosin-to-water ratio of 60:40 exhibit the best adhesion performance and are suitable for application on wood and paper substrates. The wet glue also exhibits superior adhesion performance compared to commercial wood and paper glue.
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