Recent developments in the anti-graffiti coatings: an attentive review

Amrutkar, Shweta Y.; More, Aarti P.; Mestry, Siddhesh; Mhaske, S. T.

doi:10.1007/s11998-021-00580-z

Cited by 14 publications

(19 citation statements)

References 75 publications

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“…2 spread easily on the surfaces of all tested graffiti coatings. However, the interactions of the nanodetergents with individual graffiti paints provided detailed information on their penetrating capacities, which determine the viability and effectiveness of removing undesired coatings from surfaces [43] …”

Section: Resultsmentioning

confidence: 99%

“…However, the interactions of the nanodetergents with individual graffiti paints provided detailed information on their penetrating capacities, which determine the viability and effectiveness of removing undesired coatings from surfaces. [43] However, the nanodetergent that contained a saccharide surfactant exhibited considerably better capabilities than the one with an amino acid surfactant in terms of reducing the surface free energy of all the black graffiti paint coatings. The water-in-oil nanoemulsions stabilized by saccharide surfactants were quite successful in removing a wide variety of graffiti coatings while also being extremely versatile.…”

Section: Wettability and Removal Of Graffiti Coatingsmentioning

confidence: 99%

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Wettability of Graffiti Coatings by Green Nanostructured Fluids

Bartman,

Hołysz,

Balicki

et al. 2023

ChemPhysChem

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Green nanostructured fluids (GNFs), specifically water‐in‐oil nanoemulsions (w/o NEs), were investigated as professional “brush on, wipe off” nanodetergents for the effective removal of various challenging graffiti coatings. The efficacy of the advanced nanodetergents in eradicating resilient graffiti coatings was evaluated using various methods to assess the surface properties of forming graffiti coatings. The surface properties of these coatings were examined by assessing their wettability by water, surface free energy, and topography to obtain information on the intermolecular interactions with the nanodetergent during the wetting and graffiti removal process. Our findings revealed significant variations in the coating removal rate and efficacy of green nanostructured fluids, which are stabilized using surfactants derived from saccharides or amino acids. A water‐in‐oil nanoemulsion, stabilized by caprylyl/capryl glucoside, demonstrated exceptional efficiency at cleaning graffiti paints based on alkyd resin and containing various additives such as nitrocellulose or bitumen, from any hard surface within a short time period. However, a w/o NE, stabilized by sodium cocoyl glycinate, also showed effective removal of graffiti paints containing durable bitumen, albeit at a slower rate on. These green nanostructured fluids can be used as specific nanodetergents for the comprehensive removal of various graffiti coatings, but require a specified action time to prevent damage to the original substrate beneath the paint coating.

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Section: Resultsmentioning

confidence: 99%

Section: Wettability and Removal Of Graffiti Coatingsmentioning

confidence: 99%

Wettability of Graffiti Coatings by Green Nanostructured Fluids

Bartman,

Hołysz,

Balicki

et al. 2023

ChemPhysChem

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“…The addition of fluorinated alkyl chains to PDMS is expected to improve its anti-penetration properties because of the hydrophobicity and oleophobicity of fluorinated alkyl chains, which can suppress wetting by solvents and subsequent penetration. 2 also increases intra-and interchain interactions and causes phase segregation of ordered fluorinated side chains, which can limit the flexibility and mobility of the PDMS backbone and improve anti-penetration proporties (see Figure 1).…”

Section: ■ Introductionmentioning

confidence: 99%

“…Control of penetration, the phenomenon of small molecules passing through a polymer layer, is highly desired in many applications, such as anticorrosion of metal substrates, anti-graffiti coatings, wastewater treatment, and gas separation . In addition to these uses, polydimethylsiloxane (PDMS) is widely employed as a surface coating material for anti-fouling, anti-protein, anti-friction, anti-icing, and self-cleaning applications − due to its low surface energy of 20.4 mN/m and the ability of PDMS coatings to covalently bond to a broad range of substrates. − The penetration of small molecules, such as solvent molecules, in PDMS materials is common and occurs in microfluid devices, , membranes, , and sensors, , which is known to lead to swelling of PDMS in some cases and produce changes to its chemical and physical properties. ,,− Furthermore, the liquid-like behavior of PDMS (due to its low rotation barrier around the Si–O bond (3.3 kcal/mol), weak inter-/intrachain interactions, and the low glass transition temperature of PDMS (−127 °C)) not only results in dynamic omniphobicity (a surface property repelling both polar and nonpolar solvents and allowing liquid droplets to roll off easily at small tilting angles) on its brush-type coatings , but can also enhance the ability of small molecules to penetrate a PDMS layer .…”

Section: Introductionmentioning

confidence: 99%

Controlling Anti-Penetration Performance by Post-Grafting of Fluorinated Alkyl Chains onto Polystyrene-block-poly(vinyl methyl siloxane)

Zhang,

Chaudhuri,

Kaefer

et al. 2024

ACS Appl. Mater. Interfaces

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Polydimethylsiloxane (PDMS) has been widely used as a surface coating material, which has been reported to possess dynamic omniphobicity to a wide range of both polar and nonpolar solvents due to its high segmental flexibility and mobility. However, such high flexibility and mobility also enable penetration of small molecules into PDMS coatings, which alter the chemical and physical properties of the coating layers. To improve the anti-penetration properties of PDMS, a series of fluorinated alkyl segments are grafted to a diblock copolymer of polystyrene-block-poly(vinyl methyl siloxane) (PS-b-PVMS) using thiol−ene click reactions. This article reports the chemical characterization of these model fluorosilicone block copolymers and uses fluorescence measurements to investigate the dye penetration characteristics of polymer thin films. The introduction of longer fluorinated alkyl chains can gradually increase the anti-penetration properties as the time to reach the maximum fluorescence intensity (t peak ) gradually increases from 11 s of PS-b-PVMS to more than 1000 s of PS-b-P(n-C 6 F 13 -VMS). The improvement of anti-penetration properties is attributed to stronger inter-/intrachain interactions, phase segregation of ordered fluorinated side chains, and enhanced hydrophobicity caused by the grafting of fluorinated alkyl chains.

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“…Due to long-term exposure, the appearance will suffer various corrosion, such as ultraviolet radiation, mechanical wear, chloride ion, acid, alkali and salt erosion. In practical applications, the coating on the substrate surface can effectively avoid various corrosion [2,3]. Its durability is improved and its service life is prolonged.…”

Section: Introductionmentioning

confidence: 99%

Graphene's effect and mechanism on the properties of alkali-activated slag coating

Wang

Liu

Hua

et al. 2023

Mater. Res. Express

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Alkali-activated coating materials have the problem of easy cracking. Alkali-activated materials are brittle and prone to shrinkage. When used as a coating, cracks appear on the surface. It will peel off from the substrate material and the adhesion will be reduced. In order to improve the crack resistance and adhesion of alkali-activated materials as repair and protective coatings, the effect of graphene on the properties of coatings was investigated. In this paper, a coating was prepared with blast furnace slag as the main raw material and sodium silicate water glass as the activator. By adding graphene dispersion to improve the microstructure and macroscopic properties of the coating. In the experiment, 0.2 %, 0.4 %, 0.6 %and 0.8 % graphene dispersions were added to the alkali-activated slag coating, and compared with the blank sample. The drying time, apparent properties and bonding strength of the coatings with different thicknesses were measured. It was found that the graphene dispersion could improve the crack resistance of the coating. The bonding strength of the coating at 7d and 28d was also improved. When 0.8 % was added, the maximum bonding strength was 1.577 MPa. Combined with XRD, FTIR and SEM, it was found that graphene dispersion may promote the formation of zeolite phase in alkali-activated slag coating and reduce the porosity at the interface between coating and substrate. This promotes chemical bonding at the interface. The experimental results show that the graphene dispersion is beneficial to improve the cracking of the coating and enhance the bond strength with cement mortar.

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Recent developments in the anti-graffiti coatings: an attentive review

Cited by 14 publications

References 75 publications

Wettability of Graffiti Coatings by Green Nanostructured Fluids

Wettability of Graffiti Coatings by Green Nanostructured Fluids

Controlling Anti-Penetration Performance by Post-Grafting of Fluorinated Alkyl Chains onto Polystyrene-block-poly(vinyl methyl siloxane)

Graphene's effect and mechanism on the properties of alkali-activated slag coating

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