A copolymer based on perfluoropolyether (PFPE) blocks and containing carboxylate functional groups has been studied in water microemulsion. It is able to interact with polyfunctional reactive molecules, e.g. polyaziridines, giving chain extension and crosslinking. The reaction takes place “in situ” and allow the PFPE derivative to be modified directly on the stone surface. The application of this material on different stone samples improves not only the substrate hydrophobicity (as expected for a perfluoropolyether derivative) but also the resistance to the dirtying which could be caused by mural writings (e.g. by inks). The treatment generates a protecting layer which resists on the stone surface even after several repeated staining/cleaning cycles, giving rise to a permanent “antigraffiti” effect
Stone surface protection by fluoropolymers from decay caused by mural writings
LICCHELLI, MAURIZIO;CARO', FEDERICO;
2006-01-01
Abstract
A copolymer based on perfluoropolyether (PFPE) blocks and containing carboxylate functional groups has been studied in water microemulsion. It is able to interact with polyfunctional reactive molecules, e.g. polyaziridines, giving chain extension and crosslinking. The reaction takes place “in situ” and allow the PFPE derivative to be modified directly on the stone surface. The application of this material on different stone samples improves not only the substrate hydrophobicity (as expected for a perfluoropolyether derivative) but also the resistance to the dirtying which could be caused by mural writings (e.g. by inks). The treatment generates a protecting layer which resists on the stone surface even after several repeated staining/cleaning cycles, giving rise to a permanent “antigraffiti” effectI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.