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Mechanically blown wall-projected tannin-based foams

Abstract : Condensed flavonoid tannin-based foams from quebracho tannin extract have been developed using a new method of expansion based on fire-fighting or tunneling foams, where a foam concentrate forms a stable liquid foam. This new mechanical method of expansion allows obtaining a solid porous material after curing and hardening at room temperature, through a liquid foam formed by a tannin resin and an aqueous solution of surfactant. The stability of the as-obtained liquid foam and the influence of the amount of catalyst are reported. The use of this new approach for preparing tannin-based rigid foams avoids the problem of shrinkage presented by many other formulations where physical or chemical foaming is employed. Non-ionic surfactants have also been used in the formulation to obtain smaller cells and improve the structure of the new material. Bulk density (0.069–0.080 g/cm3), mechanical (compressive strength of 0.034–0.13 MPa) and thermal (0.045–0.047 W m−1 K−1) properties and morphological appearance of the foams have been characterised and reported.
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Submitted on : Thursday, January 14, 2021 - 7:06:46 PM
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F.J. Santiago-Medina, C. Delgado-Sánchez, M.C. Basso, A. Pizzi, V. Fierro, et al.. Mechanically blown wall-projected tannin-based foams. Industrial Crops and Products, 2018, 113, pp.316-323. ⟨10.1016/j.indcrop.2018.01.049⟩. ⟨hal-03110764⟩



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