Sustainable usage of yerba mate industry by-product in laminates development from biobased adhesives

MONROY, YULIANA; DELADINO, LORENA; RIVERO, SANDRA; GARCÍA, ALEJANDRA

Congreso; WCCE11. 11th World Congress of Chemical Engineering.; 2023

In Argentina, along yerba mate (Ilex paraguariensis) industrial processing tons of powder are causedas a byproduct, an excellent source of biomass and active compounds to develop biodegradablematerials. Cassava starch (Manihot esculenta) modified with butanetetracarboxylic acid (BA) is an ecofriendly option to obtain biobased adhesives. The aim of this work was to develop sustainable laminatesfrom starch-based adhesives and yerba mate powder (YMP) and to study their structural andmechanical properties. Cassava starch suspensions (5% p/p) were gelatinized (20 min, 90°C). Once atroom temperature, native starch (5g /100g suspension) as filling agent and 20 or 40% of BA (g/100gstarch) were added, the effect of sodium propionate (NaP) as a catalyst was also assessed (50%NaP/100g BA). Blends of bioadhesive and PYM were prepared (1:1, adhesive:PYM). Panels wereobtained by thermocompression in a hydraulic press with a pressure of at 130°C for 5 min, to preformmonolayer materials, later assembled with adhesive to obtain bilayer laminates. The laminates exhibitedgood structural integrity. Thickness of mono-layer materials was 0.5 mm, whereas bi-layer onesduplicated this value regardless of the formulation (p>0.05).Incorporation of the catalyst decreased the rugosity values in mono-layer systems. Mechanical profilesof bi-layer laminates with 20% of BA showed an increase of 219% of puncture resistance with respectto monolayer materials.Looking into the obtained results, laminates developing, as well as adhesive formulation versatilityconstitute eco-friendly alternatives for designing sustainable materials from yerba mate industrial waste.