Surface characterization and effectiveness evaluation of anti-graffiti coatings on highly porous stone materials

Lettieri, Mariateresa; Masieri, Maurizio

doi:10.1016/j.apsusc.2013.10.056

Cited by 43 publications

(33 citation statements)

References 36 publications

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“…The water-stone static contact angle was used as indirect evidence of a hydrophobic layer on the surface, since the contact angle cannot be evaluated on the untreated "Lecce stone". Due to intrinsic characteristics of this material, the water absorption is very high and rapid and the drops of water do not remain on the surface [32]. The mechanisms behind the hydrophobic character of the coatings were not investigated in this study.…”

Section: Preliminary Tests: Static Contact Angle and Colour Measurementsmentioning

confidence: 99%

Performances and Coating Morphology of a Siloxane-Based Hydrophobic Product Applied in Different Concentrations on a Highly Porous Stone

Lettieri

Masieri

2016

Coatings

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Many polymers, able to confer a hydrophobicity to treated surfaces, have been proposed for the restoration and conservation of civil and monumental buildings. Polysiloxanes, and their precursors, the silanes, have been frequently employed for stone protection. To avoid decay of the treated surfaces, the effectiveness and harmlessness of the treatment need to be carefully evaluated before application in the field. In this study, a commercial alkyl-siloxane was tested as a protective treatment on a highly porous stone, starting from water solutions with different contents of the product. The treatments have been devised to try to balance the requirements and the sustainability of the conservative actions. Sustainability, in terms of costs and environmental impact, is regarded as a key factor in the 21st century. Morphological observations of the stone surface, static contact angle and colour measurements, water vapour transmission test, and tests of water absorption were carried out to characterize the untreated and treated stones. A concentration below the minimum level suggested by the manufacturer was still able to act as a good barrier against water. More concentrated solutions produced polymer accumulation and coatings with extended cracks. The properties of the treated stone were affected by the presence of cracks in the coating.

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Section: Preliminary Tests: Static Contact Angle and Colour Measurementsmentioning

confidence: 99%

Performances and Coating Morphology of a Siloxane-Based Hydrophobic Product Applied in Different Concentrations on a Highly Porous Stone

Lettieri

Masieri

2016

Coatings

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“…The maximum penetration was 10% of the sample thickness. The elastic modulus and hardness of the coated samples were calculated using the Oliver-Pharr method [13].…”

Section: Nano-indenter-surface Hardness Studymentioning

confidence: 99%

Development and Evaluation of Nano-Silica Dispersed Polyurethane Based Coatings for Improved Anti-Graffiti and Scratch Resistance

Adapala¹,

Gaur²,

Puri³

et al. 2015

OJAppS

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Polyurethane based anti-graffiti coatings have been developed by incorporating varying amounts of OH-functional Silicone modified polyacrylate. Optimization of Silicone polyacrylate concentration in neat PU was done by testing its performance for graffiti resistance. Tests which include static contact angle measurements with water and spray paint, visual inspection of stain removal and color change measurements were performed. It was observed that 5 wt % of Silicone polyacrylate in the neat PU showed 95% stain removability. These coatings showed excellent graffiti resistance but poor mechanical properties. Hence modification of these coatings was done by nano-particle incorporation. Nano-silica particle concentration was optimized for surface mechanical properties such as surface hardness, elastic modulus and scratch resistance. FEG-TEM revealed that nano-silica particles were uniformly distributed over the surface. 5 wt % nano-silica particle additions in PU-5 wt % silicone polyacrylate base showed superior mechanical properties than other concentrations. Color change measurements showed that nano-silica particle addition had no effect on its graffiti resistance. Hence PU-5 wt % silicone polyacrylate, 5 wt % nano-silica showed excellent graffiti resistance and mechanical properties.

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“…Among these applications, antigravity is one of particular interest [5,6]. The control of the paint spreading on surfaces is a powerful strategy to avoid monument degradation by unauthorized artwork.…”

Section: Introductionmentioning

confidence: 99%

Surfaces Bearing Fluorinated Nucleoperfluorolipids for Potential Anti-Graffiti Surface Properties

2017

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Graffiti can sometimes be a problem when put in an inappropriate place. We looked at a means to prevent such inconvenience. In this work, we explore the possibility of developing surfaces with controlled wettability. If the paint does not spread, the graffiti does not stay. Here, the synthesis and electrodeposition of original 3,4-ethylenedioxythiophene (EDOT) with perfluorinated nucleolipids (ante approach) is reported. The elaboration of similar surfaces using post functionalization is also described. All the prepared surfaces were then investigated for their roughness, wettability, and morphology. Highly hydrophobic features are reported (θ = 137 • ) and oleophobic properties are also reported (θ = 110 • ) showing real potential for the control of surface wettability and for potential anti-graffiti applications, consequently. The surfaces obtained with the ante approach are rougher and more hydrophobic.

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Surface characterization and effectiveness evaluation of anti-graffiti coatings on highly porous stone materials

Cited by 43 publications

References 36 publications

Performances and Coating Morphology of a Siloxane-Based Hydrophobic Product Applied in Different Concentrations on a Highly Porous Stone

Performances and Coating Morphology of a Siloxane-Based Hydrophobic Product Applied in Different Concentrations on a Highly Porous Stone

Development and Evaluation of Nano-Silica Dispersed Polyurethane Based Coatings for Improved Anti-Graffiti and Scratch Resistance

Surfaces Bearing Fluorinated Nucleoperfluorolipids for Potential Anti-Graffiti Surface Properties

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