Invisible but functional - antistatic coatings

Invisible but Functional
Anti-static coatings
Smart Coating Application Lab
27/10/2016 1© sirris | www.sirris.be | info@sirris.be |

Events due to Electrostatic (Dis)charging
27/10/2016 2
 Foto’s
© sirris | www.sirris.be | info@sirris.be |

Electrostatic generation and discharge

Anti-static properties
 Conductive plastics
 Blend in conductive fillers
 Can reduce mechanical strenght
 Change color
 Make processing more difficult
Coatings

Creating anti-static coatings
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 Carbon nanotubes (CNT)
 Increased strenght
 Flexible
 Transparent
 Permanent
 Moderate/high cost
Ref:Eikos
Ref: BYK
Ref: BYK

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 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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 ATO (Antimony Tin Oxide)
 Durable
 Non humidity dependent
 Transparent
 Permanent
 Lower cost than ITO
Ref:Kriya Materials
Coated tube
Uncoated tube

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 PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate)
 Flexible
 Transparent
 Permanent/UV-degradation
 Water-based
 Low cost
Ref:AgfaRef: Heraeus

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 Sprays
 Easy to apply
 Based on anti-static chemicals (e.g. glycerol ester, alkyl sulphonate)
 Attracting moisture from air
 Non-permanent
 Low cost

Case: Playfields for electronic games
 Belgian producer of electronic games
 In house production and
development (software, electronics,
mechanics)

 ESD problem
 Metal rolling ball on non-conductive playfield
 ESD when ball falls thru hole, damaging
ledlight electronics

 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

 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

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 Results
 Optimizing application by spray coating
 Adapting coating solution for optimal spraying
 5 minutes at 80°C , UV curing
Optimization of thickness
Adhesion (cross-cut)

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 Results
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

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 Wear-resistance
Sample Roughness profile
#
stroke
s
As-is varnish 1500
Optimized coating 1500

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 Charge analysis
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

 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

Conclusions
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 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

27/10/2016© sirris | www.sirris.be | info@sirris.be |
0498919463
Patrick.Cosemans@sirris.be
Patrick Cosemans
Optional LinkedIn ProfilePatrick cosemans

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

Invisible but functional - antistatic coatings

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