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

1. Invisible but Functional
Transparent, protective coatings on plastics
and metals
Smart Coatings Application Lab
27/10/2016 1© sirris | www.sirris.be | info@sirris.be |

2. Outline
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 Modern hybrid coatings for protection
 Scratch resistant coatings for plastics
 Protective coatings for metals
 Case CEBO Automotive
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3. Protective functions
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 Protection of the surface is one of the most
required properties of a coating
 We consider here protection against
 Mechanical degradation (Mar, micro-abrasion)
 Chemical attacks (including oxidation and corrosion)
 Degradation by dirt and daily use
 Invisible
 Transparent
 Thin coatings
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4. Possible coatings
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 Common coatings (varnish): organic
 Acrylate, epoxy, polyurethane
 Modern coatings: hardcoats
 Hybride coatings organic-inorganic nanostructure
 Combine properties of both organic and inorganic materials
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Property Process-
ability
Hardness Thermal
resistance
Chemical
resistance
Surface
energy
Organic high Low low low low
Inorganic low High high high high

5. Hybrid coatings: chemical structures
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 Mainly 3 types are used
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Polysiloxane Polysilazane
Sol gel
Polysilixane Polysilazane Sol gel Hybride
• Thermal or UV
curing
• Industrial
coating
• Thermal curing
• Hard and though
• Expensive
• Thermal or UV
curing
• Functionizable

6. Hybrid coatings: application
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 Wet coatings to be applied as a thin layer: 1 – 10 µm
 Application by traditional techniques
 Spraying
 Dipping
 Flow coating
 Curing
 Thermal or UV
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Industrial flow coating line
Scheme of industrial
spray coating line for
tiles

7. Scratch resistant, transparent on plastics
27/10/2016 7© sirris | www.sirris.be | info@sirris.be |
Examples Automotive (Momentive)
MCC Smart Roadster PHC587
sun roof
Momentive AS4000
DaimlerChrysler GL-class
Various applications using
PHC587, SHC5020 and UVHC7000.

8. Scratch resistant, transparent on plastics
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 Measuring scratch resistance by Taber test
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Circular Taber Abraser; ASTM D4060
Abrasive wheel CS10F
500 g Load
Addition of silica nanoparticles to
increase scratch resistance

9. Protective coatings on metals
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 Examples (Hempel – Schaepman)
 Architecture
 Kitchens and bathrooms
 Consumer products
 Technical components
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10. Protective coatings on metals
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 Anti-fingerprint coating (Nano-X)
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11. Case CEBO
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 CEBO Automotive (Ingelmunster) refurbishes
cast aluminium parts from oldtimer cars
 They use an in-house developped blasting
and peening process to render the surface
of the components in their original state
 Question of CEBO
Can we apply a protective coating to the
refurbished surfaces which is invisible, but
protects the surface?
 High temperature resistant (no yellowing)
 Mechanically strong coating
 Protection against chemicals and dirt
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CEBO AUTOMOTIVE

12. Case CEBO
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Sirris: selection of possible coatings and further selection by testing
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CEBO AUTOMOTIVE
Not
coated
Siloxane-
PES
Hybride
sol gel
UV sol
gel
Silazane
thickness / 10 µm 3 µm 15 µm 0,5 µm
Chemical
and dirt
resistance
- + + + +
Heat
resistance
+ + + - +
Gloss 60° 11 51 17 44 9
Pencil
hardness
4H 3H 5H 5H 5H

13. Case CEBO
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 Advice for CEBO
 From the tests appeared the best coatings for the application
of CEBO
 Hybrid sol gel (thermal curing)
 Silazane coating
 Final coating: Hybrid sol gel
 Economic
 Easy to apply (brush or sponge)
 Thermal curing at 100 – 130 °C
© sirris | www.sirris.be | info@sirris.be |
CEBO AUTOMOTIVE

14. General Conclusion
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 Modern hybrid coatings are high quality coatings for the
protection of plastic and metal products.
 Further functionalization such as anti-fingerprint or easy-to-
clean is possible
 Application and curing of the coatings is analogue to other
coatings.
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15. 27/10/2016© sirris | www.sirris.be | info@sirris.be |
+32 498 919372
Walter.Lauwerens@sirris.be
Walter Lauwerens, Senior Projects Manager

16. 27/10/2016© sirris | www.sirris.be | info@sirris.be |
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