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Invisible but functional - anti-fog coatings

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Smart coating roadshow - 30 September 2016
Invisible but functional - anti-fog coatings

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Invisible but functional - anti-fog coatings

  1. 1. Invisible but Functional Anti-fog coatings Smart Coating Application Lab 27/10/2016 1© sirris | www.sirris.be | info@sirris.be |
  2. 2. Fogging/condensation 27/10/2016 2 Clear/transparent substrate Glass/plastics Relative humidity Delta T Water condensates to form droplets Obscured vision resulting in safety issues © sirris | www.sirris.be | info@sirris.be |
  3. 3. Anti-fogging solution 27/10/2016 3© sirris | www.sirris.be | info@sirris.be |  Treatment to prevent water condensation (small droplets on surface)  Originally developed by NASA  Prevent fogging of interior helm visor during space walks
  4. 4. Anti fog mechanism 27/10/2016 4  Preventing condensation by increase wetting ability of the substrate  Make the substrate “water-loving”  Increase surface energy Superhydrophillicity No water droplets formation WCA < 5° http://www.weetect.com/anti-fog-solution-guide/ http://www.ceyecare.net/Content/eyeglasses/lenses/essilor/optifog/default.aspx
  5. 5. 27/10/2016 5© sirris | www.sirris.be | info@sirris.be |
  6. 6. How? 27/10/2016 6  You need a coating with water loving “ingredients”  Presence of polar groups (-OH, -COOH, -NH3, PO) increases attraction towards water © sirris | www.sirris.be | info@sirris.be |
  7. 7. Example: Sugar 27/10/2016 7  Very soluble in water because of –OH functional polar groups © sirris | www.sirris.be | info@sirris.be |
  8. 8. Anti-fog products 27/10/2016 8© sirris | www.sirris.be | info@sirris.be |  Easy to apply (spraying)  No curing needed  Cheap  Not permanent  No chemical bonding with substrate  Saturation of coating with water
  9. 9. Permanent high-end anti-fog coating 27/10/2016 9  Require advanced technology  Dipcoating  Flowcoating  Curing at higher temperatures needed (120°C-130°C)  Temperature resistance substrate!  Hardness and durability of the coating © sirris | www.sirris.be | info@sirris.be | Source: Université Laval Press Release Polyvinyl alcohol 4 successive layers Chemical bonding
  10. 10. Demo 27/10/2016 10© sirris | www.sirris.be | info@sirris.be |
  11. 11. Conclusions Anti-Fog 27/10/2016 11  Transparency is key  Superhydrophillic surface  Attract water to form a thin layer of water  Lots of products (choice)  High-end or low-end use © sirris | www.sirris.be | info@sirris.be |
  12. 12. 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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