Crosslinked fluorinated polyurethanes for the protection of stone surfaces from graffiti

Licchelli, Maurizio; Marzolla, Simone Jacopo; Poggi, Antonio; Zanchi, Chiara

doi:10.1016/j.culher.2010.07.002

Cited by 48 publications

(20 citation statements)

References 19 publications

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“…Biomineralisation has being experimented as a protective treatment through the development of layers of calcium carbonate (Dick et al 2006;De Muynck et al 2008;Chunxiang et al 2009;Achal et al 2010;Anne et al 2010). One can include among protection products those applied to prevent commonplace human actions such as graffiti (examples can be seen in Carmona-Quiroga et al 2010;Licchelli et al 2011;García and Malaga 2012).…”

Section: Protective Treatmentsmentioning

confidence: 98%

Conservation of stony materials in the built environment

Alves

Sanjurjo-Sánchez

2015

Environ Chem Lett

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Materials in the built environment are exposed to several agents that promote alteration processes resulting in features that might be considered detrimental of its value. There are diverse possible intervention measures that might, however, have unwanted side effects. Here are reviewed the main issues related to the struggle against these alteration processes, from the consideration of the intervention criteria to strategic considerations on the organisation of the intervention that must include temporal and spatial features of alteration processes, as well as possible interventions on the surroundings of the materials and in the materials, including its replacement. The longterm effectiveness of these interventions is linked with the global strategy namely in relation to the conditions that promote alteration processes. Some sustainability questions related to the intervention operations are also considered such as the use of toxic substances and the consumption of resources.

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Section: Protective Treatmentsmentioning

confidence: 98%

Conservation of stony materials in the built environment

Alves

Sanjurjo-Sánchez

2015

Environ Chem Lett

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“…For all these reasons, starting from the 1990s, conservators and conservation scientists have been searching for solutions and methodologies to safely and selectively remove graffiti from buildings and monuments [2][3][4][5][6][7][8][9][10], and for anti-graffiti products [11][12][13][14], designed to prevent the adhesion of paint layers to surfaces of artistic interest. Current methodologies for the removal of graffiti can be ideally grouped in three classes: chemical, physical and biological methods [4].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured fluids for the removal of graffiti – A survey on 17 commercial spray-can paints

Baglioni

Poggi

Benavides

et al. 2018

Journal of Cultural Heritage

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Graffiti removal from monuments, such as statues or architecture, is becoming a priority for conservators and restorers. This operation is further complicated when the vandalism is carried out on surfaces that should be preserved, as in the case of writings or tags on historical wall paintings, or even on modern or contemporary pieces of street art. Several methods exist for graffiti removal, which include chemical, physical or biological approaches. However, traditional methodologies, such as the use of neat organic solvents, are often unsuitable. Moreover, due to the great variability of brands and formulation of commercial paints, a thorough study of materials used for graffiti and a deep knowledge of their behavior when exposed to cleaning media is currently lacking. In this contribution, we report a systematic laboratory survey on 17 different spray-can paints available on the market and commonly used for graffiti and vandalism in the Mexican area. These paints were analyzed by means of ATR FT-IR spectroscopy to characterize their composition. Several solvents, having different nature and polarity, were then used to remove the paints from glass slides. On the basis of these results, two different amphiphile-based nanostructured fluids, which present several advantages with respect to traditional cleaning methodologies, were formulated and tested on the same paint samples. Finally, the two nanostructured cleaning systems were used for the removal of vandalistic graffiti from stones decorated with red pre-Hispanic paintings in the archeological site of Ba' Cuana, Asunciòn Ixtalpetec, Oaxaca, Mexico.

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“…Fluorinated polymers are a class of highly performing materials that exploit the superior strength of the carbon‐fluorine bond to achieve very peculiar properties such as high thermal stability, excellent chemical resistance, and outstanding weatherability. Among them, perfluoropolyether (PFPE) functional oligomers have been used as building blocks for the realization of high performance copolymers, mainly based on the polyurethane chemistry . Thanks to these characteristics, these systems have been exploited in a variety of scientific and technological fields that include original equipment manufacturing coatings, plastic coatings, rubber seals, and water/oil repellent finishings .…”

Section: Introductionmentioning

confidence: 99%

Novel conductive nanocomposites from perfluoropolyether waterborne polyurethanes and carbon nanotubes

Molina

Griffini

Levi

et al. 2014

Polymers for Advanced Techs

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The exceptional electrical conductivity of carbon nanotubes (CNTs) has been exploited for the preparation of conductive nanocomposites based on a large variety of insulating polymers. Among these, perfluoropolyether-polyurethanes (PFPE-PUs) represent a class of highly performing fluorinated materials with excellent water/oil repellency, chemical resistance, and substrate adhesion. The incorporation of highly conductive fillers to this class of highly performing materials allows them to be exploited in new technological and industrial fields where their unique properties need to be combined with the electrical conductivity or the electrostatic dissipation properties of carbon nanotubes. However, no studies have been presented so far on nanocomposites based on PFPE-PUs and CNTs. In this work, polymer nanocomposites based on waterborne PFPE-PUs and increasing amounts of carboxylated multiwall CNTs (COOH-CNTs) were prepared and characterized for the first time. The effect of increasing concentration of COOH-CNTs on the physical, mechanical, and surface properties of the nanocomposites was investigated by means of rheological measurements, dynamic mechanical analysis, thermal characterization, optical contact angle measurements, and scanning electron microscopy. In addition, electrical measurements showed that the highly insulating undoped PFPE-PU system undergoes substantial modifications upon addition of COOH-CNTs, leading to the formation of conductive nanocomposites with electrical conductivities as high as 1S/cm. The results of this study demonstrate that the addition of COOH-CNTs to PFPE-PU systems represents a promising strategy to expand their possible use to technological applications where chemical stability, water/oil repellence and electrical conductivity are simultaneously required. © 2014 John Wiley & Sons, Ltd

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Crosslinked fluorinated polyurethanes for the protection of stone surfaces from graffiti

Cited by 48 publications

References 19 publications

Conservation of stony materials in the built environment

Conservation of stony materials in the built environment

Nanostructured fluids for the removal of graffiti – A survey on 17 commercial spray-can paints

Novel conductive nanocomposites from perfluoropolyether waterborne polyurethanes and carbon nanotubes

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