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

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

Congreso; XI World Chemical Engineering Congress; 2023

In Argentina, along yerba mate (Ilex paraguariensis) industrial processing tons of powder are caused as a byproduct, an excellent source of biomass and active compounds to develop biodegradable materials. Cassava starch (Manihot esculenta) modified with butanetetracarboxylic acid (BA) is an eco-friendly option to obtain biobased adhesives. The aim of this work was to develop sustainable laminates from starch-based adhesives and yerba mate powder (YMP) and to study their structural and mechanical properties. Cassava starch suspensions (5% p/p) were gelatinized (20 min, 90°C). Once at room temperature, native starch (5g /100g suspension) as filling agent and 20 or 40% of BA (g/100g starch) 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 were obtained by thermocompression in a hydraulic press with a pressure of at 130°C for 5 min, to preform monolayer materials, later assembled with adhesive to obtain bilayer laminates. The laminates exhibited good structural integrity. Thickness of mono-layer materials was 0.5 mm, whereas bi-layer ones duplicated this value regardless of the formulation (p>0.05).Incorporation of the catalyst decreased the rugosity values in mono-layer systems. Mechanical profiles of bi-layer laminates with 20% of BA showed an increase of 219% of puncture resistance with respect to monolayer materials.Looking into the obtained results, laminates developing, as well as adhesive formulation versatility constitute eco-friendly alternatives for designing sustainable materials from yerba mate industrial waste.