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Nanoparticles as enablers of new functionalities in wet coatings
Heidi Van den Rul, program manager coatings Sirris Smart Coating Application Lab Wetenschapspark 3 – 3590 Diepenbeek
18.11.14 1 © sirris | www.sirris.be | [email protected] |
Select, modify, and develop
functional coatings
demonstrators prototypes
recipes, test reports…
Optimize coating on product
18.11.14 © sirris | www.sirris.be | [email protected] |
Increase product added value Increase product lifetime
2
Focus on industrial surface treatment innovations
Working with innovative coatings
18.11.14 3
easy-to-clean abrasion resistant antimicrobial and hygienic photocatalytic antifouling conductive haptic anti-fingerprint self healing … nanotechnology-based multifunctional
© sirris | www.sirris.be | [email protected] |
anti-mud
anti-graffiti
smart sensor layers
anti-fingerprint
Liquid coatings organic matrix: epoxy, acrylate, urethane,…
Organic (co-)polymers Additives
Inorganic nanoparticles
Anti-reflection (super) hydrophobic Easy to clean Abrasion and scratch
resistant 4 16.01.15 © sirris | www.sirris.be | [email protected] |
Sol-gel networks (inorganic, hybrid)
18.11.14 5 © sirris | www.sirris.be | [email protected] |
Spray coat
dip coat
flow coat
Deposition of the coatings
Knife/blade/rakel coat
18.11.14 6 © sirris | www.sirris.be | [email protected] |
Thermal curing
UV curing
Curing of the coatings
Room temperature
Nanoparticles as enablers of new functionalities in wet coatings
18.11.14 7
Multifunctional coatings: abrasion resistant easy-to-clean Uv-resistant transparent
Easy-to-clean superhydrophobic antimicrobial and hygienic Photocatalytic haptic
© sirris | www.sirris.be | [email protected] |
Circular Taber Abraser; ASTM D4060
Abrasion resistant coating transparent
18.11.14 © sirris | www.sirris.be | [email protected] |
Multifunctional coatings from wet chemical formulations
8
Coating developed @ Sirris Smart Coating App Lab (project IWT-VIS-CO multifunctional coatings)
Addition of nano-silica (dispersion) to a UV-curable polyurethane acrylate formulation results in an increased abrasion resistance
Abrasion resistance tests
Multifunctional coatings from wet chemical formulations
18.11.14 © sirris | www.sirris.be | [email protected] | 9
Abrasion resistant + easy-to-clean coating transparent
Addition a hydrophobically modified co-resin to the formulation • results in an increase in hydrophobicity
Coating developed @ Sirris Smart Coating App Lab (project IWT-VIS-CO multifunctional coatings)
Water contact angle tests
Maximum WCA @ 10 wt% coresin
Multifunctional coatings from wet chemical formulations
18.11.14 © sirris | www.sirris.be | [email protected] | 10
Abrasion resistant + easy-to-clean coating transparent
Addition a hydrophobically modified co-resin to the formulation • results in an increase in hydrophobicity • requires optimization of the amount of added nanoparticles for abrasion
resistance Coating developed @ Sirris Smart Coating App Lab (project IWT-VIS-CO multifunctional coatings)
Abrasion resistance tests
Multifunctional coatings from wet chemical formulations
18.11.14 © sirris | www.sirris.be | [email protected] | 11
Abrasion resistant + easy-to-clean coating transparent
More hydrophobic co-resin means a more durable easy-to-clean character
Coating developed @ Sirris Smart Coating App Lab (project IWT-VIS-CO multifunctional coatings)
Tuning of formulation towards desired end properties is possible
Test of durability of easy-to-clean properties
Multifunctional coatings from wet chemical formulations
18.11.14 © sirris | www.sirris.be | [email protected] | 12
Abrasion resistant + easy-to-clean + UV resistant coating transparent
Coating developed @ Sirris Smart Coating App Lab (project IWT-VIS-CO multifunctional coatings)
Addition of UV additives results in • better UV resistance • no differences in other properties
Test of durability of coating under intense UV light (QUV)
Without additives With additives
anti-graffiti properties
Multifunctional coatings from wet chemical formulations
18.11.14 © sirris | www.sirris.be | [email protected] | 13
Abrasion resistant + easy-to-clean + UV resistant coating transparent
scratch resistance
Coating developed @ Sirris Smart Coating App Lab (project IWT-VIS-CO multifunctional coatings)
Case: easy-to-clean and acid- resistant coatings on stone
18.11.14 14
© sirris | www.sirris.be | [email protected] |
Challenge: Protection of porous natural stone to make it acid and water resistant and dirt repellent for use in kitchen, bathroom, …
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
18.11.14 16 © sirris | www.sirris.be | [email protected] |
water
hexadecaan
0
20
40
60
80
100
120
140
160
cont
act h
oek
(°)
Coated with different hydrophobising products
Gypsum containing stone
0
20
40
60
80
100
120
140
160
cont
act h
oek
(°)
wate
hexa
water
hexadecaan
Limestone (marble)
Coated with different hydrophobising product
Case: easy-to-clean and acid- resistant coatings on stone
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
Not coated coated
Increase of water resistance for all tested coatings
Contact angle analysis
Protective effect of sealant coating on limestone
Gypsum containing stone
Limestone (marble)
Not coated
Product pH Test
Acetic acid 10% 3 Drop, 16h, cleaning with mild soap solution
after 16h cleaned
dull surface
Coated
after 16h cleaned
Case: easy-to-clean and acid- resistant coatings on stone
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen 18.11.14 © sirris | www.sirris.be | [email protected] | 17
Acid resistance test
18.11.14 18
Easy-to-clean effect of sealant coating
© sirris | www.sirris.be | [email protected] |
Gypsum containing stone
Limestone (marble)
Not coated
Product Test Wine (w)
Drop, 16h, cleaning with mild soap solution Coffee (k) Orange juice (m)
after 16h Cleaned
Coated
after 16h Cleaned
Case: easy-to-clean and acid- resistant coatings on stone
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
Dirt tests
Case: easy-to-clean coating on sunscreens
18.11.14 20
Challenge: protection of sunscreens installed at high altitude (e.g. skyscrapers) to make sure they stay longer clean
© sirris | www.sirris.be | [email protected] |
Tapei 101/ Taiwan
Royal Hotel/Doha/Qatar
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
Easy-to-clean coatings
18.11.14 21 © sirris | www.sirris.be | [email protected] |
Superhydrophilic Photocatalytic
Θ < 10 °
Self- cleaning
Hydrophilic Θ < 90°
Hydrophobic Oleophobic
Θ > 90 °
Superhydrophobic
Θ > 150° Sliding angle < 10°
hydrocarbons fluorocarbons polysiloxanes silicones
fluorosilicones
Superhydrofobic coatings
Nelumbo nucifera “Lotus”
Easy-to-clean coatings
18.11.14 © sirris | www.sirris.be | [email protected] | 22
18.11.14 23 © sirris | www.sirris.be | [email protected] |
Contact angles analysed on flat PVC plates
Case: easy-to-clean coating on sunscreens
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
Contact angle analysis
18.11.14 24 © sirris | www.sirris.be | [email protected] |
Case: easy-to-clean coating on sunscreens
Mustard Iron oxide Carbon black Graffiti
Drying overnight and mild cleaning
No coating
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
Dirt tests
18.11.14 25 © sirris | www.sirris.be | [email protected] |
Case: easy-to-clean coating on sunscreens
Polysilazane sol-gel coating
Initially less adhesion of dirt because of coating
Improvement of ease of cleaning
Mustard Iron oxide Carbon black Graffiti
Drying overnight and mild cleaning
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
Dirt tests
18.11.14 26 © sirris | www.sirris.be | [email protected] |
Case: easy-to-clean coating on sunscreens
Super-hydrophobic
coating
Initially almost no adhesion of dirt because of coating
Great improvement
of ease of cleaning
Mustard Iron oxide Carbon black Graffiti
Drying overnight and mild cleaning
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
Dirt tests
18.11.14 27
Superhydrophobic coating superior in easy-to-clean properties
But: abrasion resistance is a problem
Coating under abrasion test now © sirris | www.sirris.be | [email protected] |
Case: easy-to-clean coating on sunscreens
Abrasion with taber linear abraser with crock adapter kit,
weight 350 g, cotton cloth
179
107
86
67 62
020406080
100120140160180200
0 5 10 15 20 25 30 35 40
angl
e (°
)
number cycli crock test
LotusLeaf standard coating
water contact angle
water sliding angle
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
Conclusion
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A coating to reduce mud adhesion and sand pick-up is an added value on a bike: Less weight increase Sponsor remains visible Easier to clean Less wear of frame
Strengthened competitive position Technological leadership
© sirris | www.sirris.be | [email protected] |
Case: easy-to-clean coating on bike frames
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
18.11.14 30 © sirris | www.sirris.be | [email protected] |
Case: easy-to-clean coating on bike frames
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
18.11.14 31 © sirris | www.sirris.be | [email protected] |
Desired coating properties Superhydrophobic coating on Carbon and Aluminium
frame Dirt repellent
Sprayable solvent based
Transparent Light haze
Minimal weight increase
Low temperature application
Permanent Semi permanent, repairable
Case: anti-mud coating on bike frames
Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen
conclusion
18.11.14 32 © sirris | www.sirris.be | [email protected] |
Photographs depicting coated (left) and non-coated (right) steel plates taken after exposure to atmosphere for about 60 days (adapted from http://www.ornl.gov/File%20Library/./06-Superhydrophobic_Materials.pdf).
Superhydrophobic coatings
Superhydrophobic coatings
18.11.14 33
Photographs of coated (left) and uncoated cables (right) depicting the functionality of hydrophobic coatings for anti- icing
(adapted from http://www.ornl.gov/File%20Library/./06-Superhydrophobic_Materials.pdf).
© sirris | www.sirris.be | [email protected] |
conclusion
18.11.14 34
Nanoparticles as enablers of new functionalities
in coatings !!!
Thank you!
© sirris | www.sirris.be | [email protected] |
+32 498 919314
Heidi Van den Rul, program manager coatings
www.sirris.be www.smartcoating.be
© sirris | www.sirris.be | [email protected] | 18.11.14