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Invisible but functional - antistatic coatings

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

Publié dans : Technologie
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Invisible but functional - antistatic coatings

  1. 1. Invisible but Functional Anti-static coatings Smart Coating Application Lab 27/10/2016 1© sirris | www.sirris.be | info@sirris.be |
  2. 2. Events due to Electrostatic (Dis)charging 27/10/2016 2  Foto’s © sirris | www.sirris.be | info@sirris.be |
  3. 3. Electrostatic generation and discharge 27/10/2016 3© sirris | www.sirris.be | info@sirris.be |
  4. 4. Anti-static properties 27/10/2016 4© sirris | www.sirris.be | info@sirris.be |  Conductive plastics  Blend in conductive fillers  Can reduce mechanical strenght  Change color  Make processing more difficult Coatings
  5. 5. Creating anti-static coatings 27/10/2016 5  Carbon nanotubes (CNT)  Increased strenght  Flexible  Transparent  Permanent  Moderate/high cost © sirris | www.sirris.be | info@sirris.be | Ref:Eikos Ref: BYK Ref: BYK
  6. 6. Creating anti-static coatings 27/10/2016 6  ITO (Indium Tin Oxide)  Durable  Non humidity dependent  Transparent  Permanent  Vacuum technology or wet-chemical  High cost © sirris | www.sirris.be | info@sirris.be | Ref: Evonik Ref:Evaporated Coatings Ref: Evonik
  7. 7. Creating anti-static coatings 27/10/2016 7  ATO (Antimony Tin Oxide)  Durable  Non humidity dependent  Transparent  Permanent  Lower cost than ITO © sirris | www.sirris.be | info@sirris.be | Ref:Kriya Materials Coated tube Uncoated tube
  8. 8. Creating anti-static coatings 27/10/2016 8  PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate)  Flexible  Transparent  Permanent/UV-degradation  Water-based  Low cost © sirris | www.sirris.be | info@sirris.be | Ref:AgfaRef: Heraeus
  9. 9. Creating anti-static coatings 27/10/2016 9  Sprays  Easy to apply  Based on anti-static chemicals (e.g. glycerol ester, alkyl sulphonate)  Attracting moisture from air  Non-permanent  Low cost © sirris | www.sirris.be | info@sirris.be |
  10. 10. Case: Playfields for electronic games 27/10/2016 10© sirris | www.sirris.be | info@sirris.be |  Belgian producer of electronic games  In house production and development (software, electronics, mechanics)
  11. 11. Case: Playfields for electronic games 27/10/2016 11© sirris | www.sirris.be | info@sirris.be |  ESD problem  Metal rolling ball on non-conductive playfield  ESD when ball falls thru hole, damaging ledlight electronics
  12. 12. Case: Playfields for electronic games 27/10/2016 12© sirris | www.sirris.be | info@sirris.be |  ESD problem  Metal rolling ball on non-conductive playfield  ESD when ball falls thru hole, damaging ledlight electronics • Transparent wear-resistant 2-component varnish • Non-conductive substrate and coating stack • Company trials with antistatic spray (sticky) and conductive powders (loss of transparency) in varnish were unsuccessful
  13. 13. Case: Playfields for electronic games 27/10/2016 13© sirris | www.sirris.be | info@sirris.be |  Request for coating with following properties  Anti-static  Transparent  No decrease in existing wear-resistance  Matt appearance  No roughness increase (effect on ball speed)  Coating selection performed  ATO (Antimoon Tin Oxide) based (lower cost than ITO)  UV curable  Transparent  hardcoat
  14. 14. Case: Playfields for electronic games 27/10/2016 14  Results  Optimizing application by spray coating  Adapting coating solution for optimal spraying  5 minutes at 80°C , UV curing © sirris | www.sirris.be | info@sirris.be | Optimization of thickness Adhesion (cross-cut)
  15. 15. Case: Playfields for electronic games 27/10/2016 15  Results © sirris | www.sirris.be | info@sirris.be | Gloss measurement angle 60° Qualification As-is varnish 11 matt Thick coating 91 High gloss Optimized coating 22 Matt (silk gloss) Roughness profile Ra (µm) As-is varnish 0,67 Optimized coating 0,46
  16. 16. Case: Playfields for electronic games 27/10/2016 16  Wear-resistance © sirris | www.sirris.be | info@sirris.be | Sample Roughness profile # stroke s As-is varnish 1500 Optimized coating 1500
  17. 17. Case: Playfields for electronic games 27/10/2016 17  Charge analysis © sirris | www.sirris.be | info@sirris.be | Charge analysis Without earthing Earthing Charge Discharge Charge Discharge As-is varnish 1-5kV Ionizing air above plate 1-5 kV Ionizing air above plate Optimized coating 1-5kV Ionizing air above plate Not possible -- Alternative coating 1-5kV Ionizing air above plate 1-5kV Slow discharge Alternative coatingOptimized coatinguncoated
  18. 18. Case: Playfields for electronic games 27/10/2016 18© sirris | www.sirris.be | info@sirris.be |  Request for coating with following properties  Anti-static  achieved  Transparent  achieved  No decrease in existing wear-resistance  improved  Matt appearance  achieved  No roughness increase (effect on ball speed)  achieved
  19. 19. Conclusions 27/10/2016 19  Electrostatic problems will remain an important issue  Increasing miniaturization and use of electronics in products  Broad range of permanent coatings that give your product anti- static properties or ESD protection  Most of these coatings tunable in a broad resistivity range  Thoroughly coating optimization necessary when adding dispersions  Combination with other properties are emerging  Increasing added product value © sirris | www.sirris.be | info@sirris.be |
  20. 20. 27/10/2016© sirris | www.sirris.be | info@sirris.be | 0498919463 Patrick.Cosemans@sirris.be Patrick Cosemans Optional LinkedIn ProfilePatrick cosemans
  21. 21. 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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