The document discusses transparent, protective coatings for plastics and metals. It describes modern hybrid coatings that combine properties of organic and inorganic materials. These coatings provide invisible protection against mechanical damage, chemicals, and dirt. The document also details a case study of applying a protective hybrid sol-gel coating to refurbished aluminum car parts. The coating protects the surfaces while maintaining an invisible, glossy appearance.

1. Invisible but Functional
Transparent, protective coatings on plastics
and metals
Smart Coatings Application Lab
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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
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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
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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

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