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12 mai 2023
Invisible but FunctionalAnti-static coatings
Smart Coating Application Lab
© sirris | www.sirris.be | [email protected] |
2 mai 2023 2© sirris | www.sirris.be | [email protected] |
Events due to Electrostatic (Dis)charging
Foto’s
2 mai 2023 3© sirris | www.sirris.be | [email protected] |
Electrostatic generation and discharge
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Anti-static properties Conductive plastics
Blend in conductive fillers
Can reduce mechanical strenght Change color Make processing more difficult
Coatings
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Creating anti-static coatings
Carbon nanotubes (CNT) Increased strenght Flexible Transparent Permanent Moderate/high cost
Ref:Eikos
Ref: BYK Ref: BYK
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Creating anti-static coatings ITO (Indium Tin Oxide)
Durable Non humidity dependent Transparent Permanent Vacuum technology or wet-chemical High cost
Ref: Evonik
Ref:Evaporated Coatings
Ref: Evonik
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Creating anti-static coatings
ATO (Antimony Tin Oxide) Durable Non humidity dependent Transparent Permanent Lower cost than ITO
Ref:Kriya Materials
Coated tubeUncoated tube
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Creating anti-static coatings
PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate)
Flexible Transparent Permanent/UV-degradation Water-based Low cost
Ref:AgfaRef: Heraeus
2 mai 2023 9© sirris | www.sirris.be | [email protected] |
Creating anti-static coatings
Sprays Easy to apply Based on anti-static chemicals (e.g. glycerol ester, alkyl
sulphonate) Attracting moisture from air
Non-permanent Low cost
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Case: Playfields for electronic games
Belgian producer of electronic games
In house production and development (software, electronics, mechanics)
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Case: Playfields for electronic games
ESD problem Metal rolling ball on non-conductive
playfield ESD when ball falls thru hole, damaging
ledlight electronics
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Case: Playfields for electronic games
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
2 mai 2023 13© sirris | www.sirris.be | [email protected] |
Case: Playfields for electronic games
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
2 mai 2023 14© sirris | www.sirris.be | [email protected] |
Case: Playfields for electronic games
Results Optimizing application by spray coating Adapting coating solution for optimal spraying 5 minutes at 80°C , UV curing
Optimization of thicknessAdhesion (cross-cut)
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Case: Playfields for electronic games Results
Gloss measurement angle 60° Qualificatio
nAs-is varnish 11 mattThick coating 91 High gloss
Optimized coating 22 Matt (silk gloss)
Roughness profile Ra (µm)
As-is varnish 0,67
Optimized coating 0,46
2 mai 2023 16© sirris | www.sirris.be | [email protected] |
Case: Playfields for electronic games
Wear-resistanceSample Roughness profile
# strok
es
As-is varnish 1500
Optimized coating 1500
2 mai 2023 17© sirris | www.sirris.be | [email protected] |
Case: Playfields for electronic games
Charge analysis
Charge analysis Without earthing Earthing
Charge Discharge Charge DischargeAs-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 coating
Optimized coating
uncoated
2 mai 2023 18© sirris | www.sirris.be | [email protected] |
Case: Playfields for electronic games
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
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Conclusions
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
2 mai 2023© sirris | www.sirris.be | [email protected] |
0498919463
Patrick Cosemans
Optional LinkedIn ProfilePatrick cosemans
2 mai 2023© sirris | www.sirris.be | [email protected] |
http://www.sirris.be
#sirris
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