Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings
This study aims to evaluate the difference in thermal behavior among paints with the presence of traditional and NIR pigments by means of a simple and cheap laboratory-scale test. Considering these goals, the thermal and esthetical properties of two different cool coatings were assessed, highlightin...
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doaj-3cb30b2b70bc4811ad0ffb9b7791b2c82020-11-25T04:10:35ZengMDPI AGCoatings2079-64122020-11-01101135113510.3390/coatings10111135Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof CoatingsStefano Rossi0Hampus Lindmark1Michele Fedel2Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, ItalyDepartment of Chemistry and Chemical Engineering, Chalmers University of Technology, Chalmersplatsen 4, 412 96 Göteborg, SwedenDepartment of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, ItalyThis study aims to evaluate the difference in thermal behavior among paints with the presence of traditional and NIR pigments by means of a simple and cheap laboratory-scale test. Considering these goals, the thermal and esthetical properties of two different cool coatings were assessed, highlighting their positive and limited aspects. Two different complex near-infrared inorganic reflective (NIR) pigments with yellow and black respectably colors were mixed in an acrylic waterborne copolymer binder. The paint formulations were applied on steel panels. The thermal performance of the coatings was investigated in the NIR-region of the light spectrum by exposing the samples to an IR-lamp. The outer and inner surface temperatures of the painted panels were recorded using thermocouples and an IR camera. The samples were aged by artificial UV-B light exposure. Color and specular gloss changes at different exposure times were evaluated. The behavior of the cool coatings was compared with that of conventional coatings with similar color characteristics. The black cool coating achieved a maximum temperature decrease, compared to the conventional black one, of approximately 12 °C. The stability for the cool coatings was very similar to that of the conventional coating, indicating that black pigment could be a potential candidate for cool-coating applications. The yellow cool coatings did not show a significant decrease in temperature compared to the conventional paint. The gloss and color changes resulted as influenced by the types and amount of pigments.https://www.mdpi.com/2079-6412/10/11/1135complex NIR-reflective pigmentsartificial UV-B radiationcool coatingsthermal propertiescolor |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Stefano Rossi Hampus Lindmark Michele Fedel |
spellingShingle |
Stefano Rossi Hampus Lindmark Michele Fedel Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings Coatings complex NIR-reflective pigments artificial UV-B radiation cool coatings thermal properties color |
author_facet |
Stefano Rossi Hampus Lindmark Michele Fedel |
author_sort |
Stefano Rossi |
title |
Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings |
title_short |
Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings |
title_full |
Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings |
title_fullStr |
Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings |
title_full_unstemmed |
Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings |
title_sort |
colored paints containing nir-reflective pigments exposed to accelerated ultraviolet radiation aging with possible application as roof coatings |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2020-11-01 |
description |
This study aims to evaluate the difference in thermal behavior among paints with the presence of traditional and NIR pigments by means of a simple and cheap laboratory-scale test. Considering these goals, the thermal and esthetical properties of two different cool coatings were assessed, highlighting their positive and limited aspects. Two different complex near-infrared inorganic reflective (NIR) pigments with yellow and black respectably colors were mixed in an acrylic waterborne copolymer binder. The paint formulations were applied on steel panels. The thermal performance of the coatings was investigated in the NIR-region of the light spectrum by exposing the samples to an IR-lamp. The outer and inner surface temperatures of the painted panels were recorded using thermocouples and an IR camera. The samples were aged by artificial UV-B light exposure. Color and specular gloss changes at different exposure times were evaluated. The behavior of the cool coatings was compared with that of conventional coatings with similar color characteristics. The black cool coating achieved a maximum temperature decrease, compared to the conventional black one, of approximately 12 °C. The stability for the cool coatings was very similar to that of the conventional coating, indicating that black pigment could be a potential candidate for cool-coating applications. The yellow cool coatings did not show a significant decrease in temperature compared to the conventional paint. The gloss and color changes resulted as influenced by the types and amount of pigments. |
topic |
complex NIR-reflective pigments artificial UV-B radiation cool coatings thermal properties color |
url |
https://www.mdpi.com/2079-6412/10/11/1135 |
work_keys_str_mv |
AT stefanorossi coloredpaintscontainingnirreflectivepigmentsexposedtoacceleratedultravioletradiationagingwithpossibleapplicationasroofcoatings AT hampuslindmark coloredpaintscontainingnirreflectivepigmentsexposedtoacceleratedultravioletradiationagingwithpossibleapplicationasroofcoatings AT michelefedel coloredpaintscontainingnirreflectivepigmentsexposedtoacceleratedultravioletradiationagingwithpossibleapplicationasroofcoatings |
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