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Invisible but functional - ir coatings

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Smart coating roadshow - 30 September 2016
Invisible but functional - ir coatings

Publié dans : Technologie
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Invisible but functional - ir coatings

  1. 1. Invisible but Functional IR-reflective coatings Smart Coating Application Lab 27/10/2016 1© sirris | www.sirris.be | info@sirris.be |
  2. 2. It all starts with the sun… Electromagnetic radiation 27/10/2016 2  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 © sirris | www.sirris.be | info@sirris.be | Source: heubachcolor
  3. 3. Heat: Absorption of VIS and IR radiation 27/10/2016 3 Degradation of  Colors (mostly due to UV)  Gloss  Elasticity Thermal expansion, stress Air conditioning  increase of energy consumption © sirris | www.sirris.be | info@sirris.be |
  4. 4. Mechanisms of heating 27/10/2016 4© sirris | www.sirris.be | info@sirris.be |
  5. 5. What do you need to keep (it) cool? 27/10/2016 5  High solar reflectance  Ability to reflect sunlight  High thermal emittance  Ability to radiate heat (ease of loosing heat to the environment) © sirris | www.sirris.be | info@sirris.be |
  6. 6. Quantification of heat buildup 27/10/2016 6  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 © sirris | www.sirris.be | info@sirris.be |
  7. 7. TSR is influenced by pigmentation 27/10/2016 7© sirris | www.sirris.be | info@sirris.be | Source: BASF
  8. 8. What are IR-reflective pigments? 27/10/2016 8© sirris | www.sirris.be | info@sirris.be | 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
  9. 9. What makes the pigments IR-reflective? 27/10/2016 9  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 reflected Reflecting IR in the range of 800-1200 nm you needs pigment particle sizes of at least 400 to 600 nm © sirris | www.sirris.be | info@sirris.be |Source: http://rhopoint.co.kr/bbs/board.php?bo_table=rho_faq&wr_id=4
  10. 10. For example: IR black pigment 27/10/2016 10© sirris | www.sirris.be | info@sirris.be | Source: BASF TSR black:42%
  11. 11. Comparison between regular and IR pigment 27/10/2016 11© sirris | www.sirris.be | info@sirris.be | Source: BASF
  12. 12. Other important parameters 27/10/2016 12  Colour of the substrate/using white primer  TSR over white substrate is higher © sirris | www.sirris.be | info@sirris.be | Pigment IR brown Source: CPSColor
  13. 13. Other important parameters 27/10/2016 13  Thickness of the coating  Thicker coating gives higher TSR: needs optimalisation © sirris | www.sirris.be | info@sirris.be |Source: CPSColor
  14. 14. Other important parameters 27/10/2016 14  High enough concentration of the IR pigment  Contamination  Small amounts of non IR reflecting colorants can have drastic effects © sirris | www.sirris.be | info@sirris.be | Source: CPSColor
  15. 15. Other important parameters 27/10/2016 15  Binder system © sirris | www.sirris.be | info@sirris.be | Source: CPSColor
  16. 16. 27/10/2016 16© sirris | www.sirris.be | info@sirris.be |  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
  17. 17. 27/10/2016 17 Setup © sirris | www.sirris.be | info@sirris.be | IR reflective paint on PVC panels Measurements pigment TSR 150µ Temperature Black 35,4 107°C IR Black 54,12 72°C Temperature reduction of 35°C
  18. 18. Conclusions 27/10/2016 18  Keeping it cool is possible with heat reflective paints, regardless the colors used.  The system needs optimalisation to ensure maximum TSR © sirris | www.sirris.be | info@sirris.be |
  19. 19. 27/10/2016© sirris | www.sirris.be | info@sirris.be | http://www.sirris.be #sirris http://www.linkedin.com/company/sirris http://techniline.sirris.be

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