invisible but functional - protective coatings
TRANSCRIPT
12 mai 2023
Invisible but Functional
Transparent, protective coatings on plastics and metals
Smart Coatings Application Lab
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Outline
Modern hybrid coatings for protection Scratch resistant coatings for plastics Protective coatings for metals Case CEBO Automotive
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Protective functions
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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Possible coatings
Common coatings (varnish): organic Acrylate, epoxy, polyurethane
Modern coatings: hardcoats Hybride coatings organic-inorganic nanostructure Combine properties of both organic and inorganic materials
Property Process-ability
Hardness
Thermal resistance
Chemical resistance
Surface energy
Organic high Low low low lowInorganic low High high high high
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Hybrid coatings: chemical structures
Mainly 3 types are used
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
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Hybrid coatings: application
Wet coatings to be applied as a thin layer: 1 – 10 µm Application by traditional techniques
Spraying Dipping Flow coating
Curing Thermal or UV
Industrial flow coating line
Scheme of industrial spray coating line for tiles
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Scratch resistant, transparent on plastics
Examples Automotive (Momentive)
MCC Smart RoadsterPHC587
sun roof Momentive AS4000 DaimlerChrysler GL-class
Various applications using PHC587, SHC5020 and UVHC7000.
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Scratch resistant, transparent on plastics Measuring scratch resistance by Taber test
Circular Taber Abraser; ASTM D4060Abrasive wheel CS10F 500 g Load
Addition of silica nanoparticles to increase scratch resistance
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Protective coatings on metals Examples (Hempel – Schaepman)
Architecture Kitchens and bathrooms Consumer products Technical components
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Protective coatings on metals Anti-fingerprint coating (Nano-X)
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Case CEBO
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 CEBOCan 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
CEBO AUTOMOTIVE
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Case CEBO
Sirris: selection of possible coatings and further selection by testing
CEBO AUTOMOTIVE
Not coated
Siloxane-PES
Hybride sol gel
UV sol gel
Silazane
thickness / 10 µm 3 µm 15 µm 0,5 µmChemical and dirt resistance
- + + + +
Heat resistance + + + - +
Gloss 60° 11 51 17 44 9Pencil hardness 4H 3H 5H 5H 5H
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Case CEBO
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
CEBO AUTOMOTIVE
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General Conclusion
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.
2 mai 2023© sirris | www.sirris.be | [email protected] |
+32 498 919372
Walter Lauwerens, Senior Projects Manager
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