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12 mai 2023
Invisible but FunctionalProtective water-resistant nanocoatings
Smart Coating Application Lab
© sirris | www.sirris.be | [email protected] |
2 mai 2023 3© sirris | www.sirris.be | [email protected] |
Water-resistant or Water-proof?
Waterproof: impervious to water Water-resistant: able to resist the penetration of
water to some degree but not entirely Water-repellent: not easily penetrated by water
No clear definition of water-resistance. Electronics: IP rating (2 digit number)
2 mai 2023 4
Water-resistant or water proof?
© sirris | www.sirris.be | [email protected] |
www.liquiproof.co.uk/
www.techsnapr.com
www.ultimateears.com
2 mai 2023 5© sirris | www.sirris.be | [email protected] |
Choice of coating?
Application
Durability
Type of material
Degree of protection
Appearance Cost
2 mai 2023 6© sirris | www.sirris.be | [email protected] |
State-of-art
Conventional application Plasma deposited
Spray, brush, roller Plasma Wet proces Dry vacuum proces (gas)Nanometer to micrometer (mostly invisible)
1 – 100 nm (Invisible)
Batch process or inlineBuilding materials, glass, metals
Electronics, textile, medical
2 mai 2023 7© sirris | www.sirris.be | [email protected] |
Conventional coatings
• Water repellent • Low surface free energy (PTFE,
silicon)• Non polar groups
• Coatings based on nanotechnology => nano coatings Silicon chemistry (Hybrid) Sol-gel nano composites
2 mai 2023 8© sirris | www.sirris.be | [email protected] |
Nano technology
Hydrophobic impregnations
Hybrid (sol-gel) composites
Super hydrophobic coatings
Impregnations
Inorganic - organic
Lotus effect
2 mai 2023 9© sirris | www.sirris.be | [email protected] |
Hydrophobic impregnations
• Silicone chemistry
• Often blends with fluorinated polymers
• Variations in formulation on different materials
• Porous surfaces Source: sika.com
2 mai 2023 10© sirris | www.sirris.be | [email protected] |
Hybrid nano composites
• Hybrid = combination of organic and inorganic
• A lot of possibilities in functionalities
• Water resistant –> easy-to-clean
2 mai 2023 11© sirris | www.sirris.be | [email protected] |
Super hydrophobic coatings
• Combination of hydrophobic groups and surface roughness, similar to lotus leaf.
• Very high water contact angle => High water repellency
Challenges: Often visible, lack durability
Suppliers: Never wet, ultra ever dry, hydrobead, Pee Back
2 mai 2023 12© sirris | www.sirris.be | [email protected] |
Plasma deposited coatings
• (Pulsed) plasma • Dry process• Gas phase – deep penetration –
- thin coatings (filters)• No additional curing step
• Used frequently in electronics, textile treatment and medical
www.plasmatreatment.co.uk
2 mai 2023 13© sirris | www.sirris.be | [email protected] |
Industry standard testing
Humidity testingImmersion testing Water protection (IPX standard) Water penetration test (Karsten Tube)Water vapor Transmission rateChemical resistanceCorrosion resistanceSalt fog testing
2 mai 2023 14© sirris | www.sirris.be | [email protected] |
Case Nanex Company
• 3 product lines: different technologies and market focus. Always dry: water repellent coatings Cleaners: nano protective cleaners Car coating
Nanex is working together with Sirris to improve their formulations.
2 mai 2023 15© sirris | www.sirris.be | [email protected] |
Case: Coating development
Main goal: To improve water-repellent products.
• Focus on improving the durability• Introduction of new functionalities• Combination of technologiesÞ Introduction of nano-particlesÞ Proper evaluation by correct testing
2 mai 2023 16© sirris | www.sirris.be | [email protected] |
Overview & Conclusions
• Many suppliers of protective water-resistent coatings
• Amount of protection is related to many factors• Miscommunication exists on water-repellancy• Durability is an issue (wear, UV protection)• Major interest in water-protective coatings &
technologies. => Future developments!
2 mai 2023© sirris | www.sirris.be | [email protected] |
http://www.sirris.be
#sirris
http://www.linkedin.com/company/sirris
http://techniline.sirris.be
