Green, Formaldehyde-free, Foams For Thermal Insulation
Maria C. Basso, Xinjun Li, Vanessa Fierro, Antonio Pizzi, Samuele Giovando, Alain Celzard
Volume 2, Issue 6, Page 378-382 | DOI: 10.5185/amlett.2011.4254
Keywords: Rigid foam; formaldehyde; thermal conductivity; bulk density
New, green and cheap rigid foams presenting outstanding performances for thermal insulation are described. Such ultra-lightweight cellular materials are mainly based on renewable chemicals: tannin and furfuryl alcohol, are very easy to produce and have thermal conductivity as low as 38 mW/m/K. Compared to previously reported tannin-based foams, these new materials are much “greener” and present improved resistance to compression and to water. Especially the formaldehyde, formerly used as cross-linking agent of tannins but known as a volatile and harmful chemical, could be successfully removed from the formulation. The as-obtained, 2nd generation, tannin-based foams are totally stable and have an expected interest for thermal insulation of buildings. Copyright © 2011 VBRI press.