Date post: | 09-Jan-2017 |
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Technology |
Upload: | sirris |
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12 mai 2023
Invisible but FunctionalIR-reflective coatingsSmart Coating Application Lab
© sirris | www.sirris.be | [email protected] |
2 mai 2023 2© sirris | www.sirris.be | [email protected] |
It all starts with the sun…Electromagnetic radiation
5% UV (300-450nm) Skin damage Degradation of paint and
polymers 46% VIS (450-750 nm)
Colors our world 49% (N-)IR (750-2500 nm)
Mostly heat
Source: heubachcolor
2 mai 2023 3© sirris | www.sirris.be | [email protected] |
Heat: Absorption of VIS and IR radiationDegradation of
Colors (mostly due to UV) Gloss Elasticity
Thermal expansion, stressAir conditioning
increase of energy consumption
2 mai 2023 5© sirris | www.sirris.be | [email protected] |
What do you need to keep (it) cool?
High solar reflectance Ability to reflect sunlight
High thermal emittance Ability to radiate heat (ease of
loosing heat to the environment)
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Quantification of heat buildup
TSR (Total Solar Reflectance) (in %)Def: TSR is the percentage of irradiated energy that is reflected by an object High TSR = high reflection = lower heat buildup
IR reflective pigments Provide means to get the TSR as high as possible
without color changes
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TSR is influenced by pigmentation
Source: BASF
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What are IR-reflective pigments?
Organic based Inorganic based Ceramic (MMO* and CICP**)
Moderate durable Long term durability Unparalleled resistance to heat, light chemicals,
Low cost Higher cost High cost
<molted metals, high temp
*Mixed Metal Oxides, **Complex inorganic colored pigments
Conventional pigments IR reflecitive pigments
2 mai 2023 9© sirris | www.sirris.be | [email protected] |
What makes the pigments IR-reflective? Most important for NIR reflectivity
Mean particle size Nanoparticles significantly enhance reflective properties
The particle size should be more than half the wavelength of the light to be reflectedReflecting IR in the range of 800-1200 nm you needs
pigment particle sizes of at least 400 to 600 nm
Source: http://rhopoint.co.kr/bbs/board.php?bo_table=rho_faq&wr_id=4
2 mai 2023 10© sirris | www.sirris.be | [email protected] |
For example: IR black pigment
Source: BASF
TSR black:42%
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Comparison between regular and IR pigment
Source: BASF
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Other important parameters Colour of the substrate/using white primer
TSR over white substrate is higherPigment IR brown
Source: CPSColor
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Other important parameters Thickness of the coating
Thicker coating gives higher TSR: needs optimalisation
Source: CPSColor
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Other important parameters
High enough concentration of the IR pigment Contamination
Small amounts of non IR reflecting colorants can have drastic effects
Source: CPSColor
2 mai 2023 15© sirris | www.sirris.be | [email protected] |
Other important parameters
Binder system
Source: CPSColor
2 mai 2023 16© sirris | www.sirris.be | [email protected] |
Panels used for outdoor application Exposure to direct sunlight resulted
in deformation of the panels IR reflective paints were used to
investigate the use of IR-reflective pigments on the surface temperature
IR reflective paint on PVC panels
2 mai 2023 17© sirris | www.sirris.be | [email protected] |
SetupIR reflective paint on PVC panels
Measurementspigment TSR 150µ Temperatur
eBlack 35,4 107°CIR Black 54,12 72°C
Temperature reduction of 35°C
2 mai 2023 18© sirris | www.sirris.be | [email protected] |
Conclusions
Keeping it cool is possible with heat reflective paints, regardless the colors used.
The system needs optimalisation to ensure maximum TSR
2 mai 2023© sirris | www.sirris.be | [email protected] |
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