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Author(s):	Schwerd, Regina; Scherer, Christian; Breuer, Klaus
Title:	Wirkstoff-Restgehalte verkapselter und freier Biozide in hydrophoben Fassadenbeschichtungen
Abstract:	In einem mehrjährigen Freilandversuch wurde die Dauerhaftigkeit der bioziden Wirkstoffe Terbutryn (2-Methylthio-4-tert-butylamino-1,3,5-triazin), Diuron (DCMU, 3-(3,4-dichlorophenyl)-1,1-dimethylurea), IPBC (3-Iodoprop-2-ynyl-N-butylcarbamat), OIT (2-n-Octyl-isothiazolin-3-on) und DCOIT (4, 5-Di-chloro-2-n-octyl-isothiazolin-3-on) in einer hydrophoben organisch gebunden Fassadenbeschichtung nach DIN EN 15824 vergleichend in freier und mikroverkapselter Form untersucht. Für die verkapselten Wirkstoffe ergaben sich dabei höhere Wirkstoff-Restgehalte in der Beschichtung über die Zeit als für frei eingesetzte Wirkstoffe. Hinweise auf gerichtete Migrationsvorgänge innerhalb der Fläche wurden nicht gefunden. Eine Bilanzierung von Einsatzkonzentrationen, Wirkstoffaustrag durch Auswaschung und Restgehalten in der Putzmatrix nach einem Jahr Freibewitterung ergab Bilanzlücken von bis zu 64 %. Contents of encapsulated and non-encapsulated biocides in hydrophobic façade coatings. The durability of the biocidal compounds Terbutryne (2-Methylthio-4-tert-butylamino-1,3,5-triazin), Diuron (DCMU, 3-(3,4-dichlorophenyl)-1,1-dimethylurea), IPBC (3-Iodoprop-2-ynyl-N-butylcarbamate), OIT (2-n-Octyl-isothiazolin-3-one) and DCOIT (4, 5-Di-chloro-2-n-octyl-isothiazolin-3-one) in a hydrophobic façade coating was examined in a several year weathering experiment. Biocide contents were determined in encapsulated and non-encapsulated form. For encapsulated biocides, the contents found in the coatings were higher than for non-encapsulated biocides. Hints indicating any migration processes of the biocidal active substances within the surface were not found. Considering the initial concentration, leaching of substances by driving rain and remaining contents in the coating after one year of weathering into a balance led to balance gaps of up to 64 %.
Source:	Bauphysik 37 (2015), No. 6
Page/s:	308-314
Language of Publication:	German

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