Sandwich Elements from Renewable Resources as a Structural Component in the Architecture

Abstract:

The necessary thermal insulation for buildings was provided for years optimally by polymer foams. Generally the foam is based on petrochemical resources. It is used for external wall insulation and not employed for additional functions. A Sandwich build of rigid laminates and a quite shear resistant polymer foam core results in an extraordinary stiff element. This provides thermal insulation and forms an independent load carrying structure. The sustainability of the sandwich structure can be raised by combining materials from renewable resources. The sandwich system currently developed, in cooperation with our partner from industries C3 Technologies, consists of lignin based foams of varying density and natural fibre reinforced laminates. The lignin is produced from beech-wood via the organosolv-process. Afterwards it is chemically integrated into the phenolic resin. The proportion of lignin in the resin can be varied from 10% up to 40%. This poses a quite prospective idea since using lignin means using nature’s own synthesis instead of artificial petrochemical processes for resin production and thus reducing the energy needed for resin production

• Periodical: Materials Science Forum (Volumes 825-826)
• Pages: 1071-1079
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.825-826.1071
• Online since: July 2015
• Authors: Andreas Krombholz*, Peter Werner, Andreas Weber
• Keywords: Biocomposite, Bioeconomy, Biofoam, Lignin, Lignosandwich, Phenolic Resin, Sandwich

References

[1] E. Genzel, P. Voigt, Kunststoffbauten Teil 1: Die Pioniere Universitätsverlag, Weimar, (2005).

[2] N. E. El Mansouri, A. Pizzi, J. Salvado, Lignin-Based Polycondensation Resins for Wood Adhesives, Journal of Applied Polymer Science 103 (2007)1690–1699.

DOI: 10.1002/app.25098

[3] H. R. Mansouri, P. Navarrete,A. Pizzi, S. Tapn-Lingua, B. Benjelloun, H. Pasch,S. Rigolet, Synthetic-resin-free wood panel adhesives form mixed low molecular mass lignin and tannin. Eur. J. Wood prod. 69 (2011) 221 – 229.

DOI: 10.1007/s00107-010-0423-0

[4] Th.Q. Hu, (Editor), Chemical Modification, Properties, and Usage of Lignin, Springer Science + Business Media, LLC, New York (2002).

[5] C. Sprengard, S. Treml, A. H. Holm, Technologien und Techniken zur Verbesserung der Energieeffizienz von Gebäuden durch Wärmedämmstoffe Metastudie Wärmedämmstoffe – Produkte – Anwendungen – Innovationen, Forschungsinstitut für Wärmeschutz e.V. München FIW, Gräfelfing (2013).

[6] D. Krug, M. Mäbert, MDF-Basisarbeit. Laubholz als Rohstoffalternative für Faserplatten im IHD-Test, MDF-Magazin Leinfelden-Echterdingen (2007), 80-85, Supplement von Holz-Zentralblatt und HK.

[7] C. Wenderdel, Charakterisierung von lignocellulosen Faserstoffen zur Herstellung mitteldichter Faserplatten (MDF). Masterarbeit. Technische Universität Dresden, Dresden (2009).

[8] D. Krug, Einfluss der Faserstoff-Aufschlussbedingungen und des Bindemittels auf die Eigenschaften von mitteldichten Faserplatten (MDF) für eine Verwendung im Feucht- und Außenbereich. Dissertation. Universität Hamburg (2010).

DOI: 10.1007/bf02990537

[9] A. Krombholz, N. Eversmann, P. Werner, Lignin based Sandwich System for load bearing insulation, Sustainable Buildings Construction Products & Technologies Barcelona (2014) 368 - 375. ISBN: 978-84-697-1815-5.

[10] A. Krombholz, P. Voigt, P. Werner, S. Wüstenhagen, Biobased Sandwich System for Applications in Architecture, Sustainable Buildings Construction Products & Technologies Graz (2013).