Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings

Rossi, Stefano; Lindmark, Hampus; Fedel, Michele

doi:10.3390/coatings10111135

Cited by 9 publications

(5 citation statements)

References 45 publications

(76 reference statements)

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“…The primer application (PS and PNR) resulted in lower L* in comparison with the specimens without primer, which can be explained by the colour of this layer being darker than the base coat. As reported by Revel et al [59], Coser et al [60], and Rossi et al [61], the incorporation of some types of NIR reflective pigments can lead to an increase of L*. However, in this study, a black-based coloured pigment was used, which explains the lower lightness difference.…”

Section: Colourmentioning

confidence: 69%

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

et al. 2021

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Near-infrared (NIR) reflective materials are being developed for mitigating building cooling needs. Their use contributes to broadening the range of colours, responding to the urban aesthetic demand without compromising the building performance. Despite the increase in NIR reflective pigments investigation, there is still a knowledge gap in their applicability, impact, and durability in multilayer finishing coatings of External Thermal Insulation Composite Systems (ETICS). Hence, the main goal of this work consists of evaluating the impact of incorporating NIR reflective pigments (NRP) in the solar reflectance of the surface layer of ETICS, without affecting the colour perception, as well as their influence on the colour durability and surface temperature. As such, colour, solar reflectance, and surface temperature were monitored for 2 years in dark-coloured specimens of ETICS, with and without NRP and a primer layer. It was confirmed that the main contribution of NRP is the increase of solar reflectance and, consequently, the decrease in surface temperature, especially for high exterior temperatures (around 30 ºC). Moreover, these pigments highly increase the NIR reflectance without affecting the visible colour. In addition, they contribute to maintaining the colour characteristics. The application of primer increased the surface temperature, especially for higher exterior temperatures. However, it contributes to a lower colour difference and solar reflectance variation, which is an important achievement for durability purposes.

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Section: Colourmentioning

confidence: 69%

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

et al. 2021

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“…In this aspect, the technology called coolcolor roofing utilizes solar reflective pigments in the form of coatings on to the windows, house roofing, walls of buildings, etc. These pigments reflects the Near-infrared (NIR) radiation and maintain cool comfort in the interior thus minimizes consumption of energy for cooling interiors [4].…”

Section: Introductionmentioning

confidence: 99%

Enhanced near-infrared reflectance and functional characteristics of nano metal oxide embedded alkyd coatings

Benitha¹,

Jeyasubramanian²,

V.S.³

2022

Mater. Res. Express

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The main idea of the research is to formulate alkyd based smart coatings with high NIR-reflectance to decrease the cooling load in order to maintain cool comfort in buildings. In addition to the NIR reflectance studies, the physical characteristics of the coating such as glossiness, hiding power, spreading area, volatile organic contents are evaluated. Heat reflective coatings are prepared by ball milling technique utilizing white metal oxide nanoparticles (NPs) titanium oxide (TiO2), zinc oxide (ZnO) and zirconium oxide (ZrO2) as pigments. The X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) results reveal the prepared metal oxide pigments are of high purity. Bonding interaction between the alkyd resin and the NPs are studied using Fourier transform infrared spectroscopy (FTIR).The spectral reflectance of the prepared coatings are measured using spectrophotometer in the solar spectrum range, wherein ZnO based nanocoatings shows better results. The cool comfort is measured for ZnO nanocoatings in an enclosed glass cabinet and the differences in temperature with respect to exposure to sunlight are highlighted. Finally, a prototype coated with ZnO NPs maintains lower indoor temperature than the commercially available white paint coated model in the order of 2.7 ºC.

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“…Considering the lightness, the standard paint (S) is darker than the NIR paint (C) in all samples, which indicates a darker black colour once the L value is lower than 30 [19,20]. The use of high near reflectance paint (C) can affect the lightness and lighter the samples in comparison to the standard one (S), as demonstrated by Rossi et al [21]. Figure 6 shows the difference calculated between the samples and between the control coordinates, considering that the human eye perceives differences higher than three [17].…”

Section: Colour and Surface Temperaturementioning

confidence: 74%

NIR reflective Paints as an Alternative for Sustainable Façade Renovation

Souza,

Veloso,

Maia

et al. 2023

J. Phys.: Conf. Ser.

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Several studies of infrared reflective materials used on opaque envelopes have shown that their application can reduce the surface temperature and the cooling energy needs of buildings and help mitigate the urban heat island effect. Some of these studies were carried out by incorporating near-infrared (NIR) reflective materials on new buildings or as part of new construction systems, considering that one of the simpler and most used façade renovation methods is repainting. In a repainting process, the reflectance could change since the reflectance depends on the interaction between the reflective layer and the substrate. A study was carried out on the reflectance of paints with NIR reflective properties applied on the finishing coat of external thermal insulation composite systems (ETICS), simulating a façade renovation. A black NIR reflective paint was applied in one layer over the existing finishing coat of two ETICS samples: one with a grey mortar colour and another with a conventional black colour. A second configuration was considered by adding an intermediate layer of regularisation with white colour. Traditional black colour and the mortars were applied on a transparent acrylic base as a reference. The samples were assessed with a modular spectrophotometer to assess the total and NIR reflectance and the colour coordinates on the CIELab space. The results showed that the reflectance and colour of the new layer are independent of the colour or type of the first layer in the case of conventional paint. Conversely, the substrate affects the NIR paint performance, where a lighter substrate can help improve the reflectance but can also lead to a more significant colour change. Likewise, the results of the paint over a new white layer resulted in a lower reflectance compared to the reflectance of a single paint layer.

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Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings

Cited by 9 publications

References 45 publications

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

Enhanced near-infrared reflectance and functional characteristics of nano metal oxide embedded alkyd coatings

NIR reflective Paints as an Alternative for Sustainable Façade Renovation

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