Abstract
Nanotechnologies are expected to hold considerable potential for the development of new materials in the construction sector. Up to now the environmental benefits and risks of products containing manufactured nanomaterials (MNM) have been quantified only to a limited extent. This study aims to assess the potential environmental, health and safety impacts of coatings containing MNM using Life-cycle assessment: Do paints containing MNM result in a better environmental performance than paints not containing MNM? The study shows that the results depend on a number of factors: (i) The MNM have to substitute an (active) ingredient of the initial paint composition and not simply be an additional ingredient. (ii) The new composition has to extend the lifetime of the paint for such a time period that the consumption of paint along the life cycle of a building is reduced. (iii) Releases of MNM have to be reduced to the lowest level possible (in particular by dumping unused paint together with the packaging). Only when all these boundary conditions are fulfilled, which is the case only for one of the three paint systems examined, is an improved environmental performance of the MNM-containing paint possible for the paint compositions examined in this study.
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Notes
Within this publication, the term “manufactured nanomaterials” and its abbreviation “MNM” are used according to the definition of the European Commission (EC 2011) indicating that this term designates all those manufactured materials “containing particles, in an unbound state or as an aggregate or as an agglomerate and where, for 50 % or more of the particles in the number size distribution, one or more external dimensions is in the size range 1–100 nm”.
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Acknowledgements
The research was internally funded by Empa and externally by ‘NanoHouse’ (grant number 247′810), a research project under the 7th framework programme of the European Commission. We herewith would like to acknowledge the support from all the project partners of ‘NanoHouse’ in the framework of establishing this paper and all the LCA calculations behind it, i.e. CEA (as coordinator), Empa, Consorzio Venezia Ricerche, Katholieke Universiteit Leuven, Université Joseph Fourier—Laboratoire de Géophysique Interne et Tectonophysique, Materis Paints, GFC Chimica, Akzo Nobel Coatings, and PPG Europe.
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Hischier, R., Nowack, B., Gottschalk, F. et al. Life cycle assessment of façade coating systems containing manufactured nanomaterials. J Nanopart Res 17, 68 (2015). https://doi.org/10.1007/s11051-015-2881-0
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DOI: https://doi.org/10.1007/s11051-015-2881-0