04 nanoparticals in wet coatings-van den rul - sirris

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

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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)


Spray coat

dip coat

flow coat

Deposition of the coatings

Knife/blade/rakel coat


Thermal curing

UV curing

Curing of the coatings

Room temperature

http://www.google.be/url?sa=i&rct=j&q=uv+curing+coatings&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http://www.smartcoating.be/news/smart-coating-lab-fabricates-sample-box-which-allows-uv-curing-under-inert-atmosphere-nitrogen&ei=1Fm1VPvfNsftaryFgYgH&bvm=bv.83339334,d.ZGU&psig=AFQjCNGtdCyqJeJlQ14_0jcO2AL6QaJUPg&ust=1421257542786823

Nanoparticles as enablers of new functionalities in wet coatings

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Multifunctional coatings: abrasion resistant easy-to-clean Uv-resistant transparent

Easy-to-clean superhydrophobic antimicrobial and hygienic Photocatalytic haptic


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


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Abrasion resistant + easy-to-clean coating transparent

Addition a hydrophobically modified co-resin to the formulation • results in an increase in hydrophobicity


Water contact angle tests

Maximum WCA @ 10 wt% coresin




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




More hydrophobic co-resin means a more durable easy-to-clean character


Tuning of formulation towards desired end properties is possible

Test of durability of easy-to-clean properties



Abrasion resistant + easy-to-clean + UV resistant coating transparent


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



Abrasion resistant + easy-to-clean + UV resistant coating transparent

scratch resistance


Case: easy-to-clean and acid- resistant coatings on stone

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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


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



Not coated coated

Increase of water resistance for all tested coatings

Contact angle analysis

Protective effect of sealant coating on limestone


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


Results of Sirris project “hybride coatingtechnologie”, demoproject Agentschap Ondernemen 18.11.14 © sirris | www.sirris.be | [email protected] | 17

Acid resistance test

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Easy-to-clean effect of sealant coating



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



Dirt tests

Case: easy-to-clean coating on sunscreens

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Challenge: protection of sunscreens installed at high altitude (e.g. skyscrapers) to make sure they stay longer clean


Tapei 101/ Taiwan

Royal Hotel/Doha/Qatar


Easy-to-clean coatings


Superhydrophilic Photocatalytic

Θ < 10 °

Self- cleaning

Hydrophilic Θ < 90°

Hydrophobic Oleophobic

Θ > 90 °

Superhydrophobic

Θ > 150° Sliding angle < 10°

hydrocarbons fluorocarbons polysiloxanes silicones

fluorosilicones

http://www.google.be/url?sa=i&rct=j&q=hydrocarbon&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http://www.autoguide.com/gallery/gallery.php/v/main/news/misc/ShouldYouUseSyntheticOil/Hydrocarbon-Chain-01.jpg.html&ei=1NxgVPL1KJbjaoeqgsAO&bvm=bv.79189006,d.d2s&psig=AFQjCNEtHvFGSPzZ5OwmVKRorK1Cv_871w&ust=1415720523216932

Superhydrofobic coatings

Nelumbo nucifera “Lotus”

Easy-to-clean coatings



Contact angles analysed on flat PVC plates



Contact angle analysis



Mustard Iron oxide Carbon black Graffiti

Drying overnight and mild cleaning

No coating


Dirt tests



Polysilazane sol-gel coating

Initially less adhesion of dirt because of coating

Improvement of ease of cleaning




Dirt tests



Super-hydrophobic

coating

Initially almost no adhesion of dirt because of coating

Great improvement

of ease of cleaning




Dirt tests

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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] |


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


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


Case: easy-to-clean coating on bike frames



Case: easy-to-clean coating on bike frames



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


conclusion


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

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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).


conclusion

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Nanoparticles as enablers of new functionalities

in coatings !!!

Thank you!


+32 498 919314

[email protected]

Heidi Van den Rul, program manager coatings

www.sirris.be www.smartcoating.be

© sirris | www.sirris.be | [email protected] | 18.11.14

04 nanoparticals in wet coatings-van den rul - sirris

Technology