Nanotechnology in coatings

Dr. Peter VENTURINI, Assistant Professor

Helios Domžale, d.d. Research and Development

one of the largest producers of paint, lacquers and synthetic resins in Central Europe

STRUCTURE OF SALES

Powder coatings3%

Boat paints 1%

Masterbatch0%

Metal coatings13%

Wood coatings6%

Decorative coatings

28%

Refinishing coatings

14%

Adhesives and straches

4%Road-marking

paints3%

Industrial Coatings27%

Synthetic resins23%

Automotive OEM5%

INCREASE OF SALES

0

20.000

40.000

60.000

80.000

100.000

120.000

140.000

160.000

180.000

200.000

IN T

ON

S

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50.000

100.000

150.000

200.000

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in 0

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UR

Total in TONS Total in 000 EUR

Total in TONS 39.422 42.363 45.357 49.176 54.116 66.350 72.134 92.802 127.438 142.968 152.392 163.830 173.997

Total in 000 EUR 66.782 71.717 73.091 82.110 91.568 114.324 133.160 169.054 229.595 259.364 311.796 350.904 353.622

1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 est. 2008 pl.2009

• World paint market 85,7 billion USD.

• Coatings with nanomaterials around 1 billion USD.

Nanoposts.com 2007

Challenges in the coatings market• Customers expectations

• Eco-efficiency and sustainability

• New scientific discoveries

INNOVATION, CHANGE(Water-borne systems!)

Lycurgus chalice 4th Century A.D. Appears green in reflected light and red if light is directed through it (70 nm particles of silver and gold in the glass)

Lycrugus cup with diffused light

Lycrugus cup with focused light

History of Nanomaterials

Expectations for Nanotechnology in coatings

• Scratch resistance• Abrasion resistance• Mechanical properties• UV-Protection• Antimicrobial• (Self-cleaning)• (Water repellence)• Conductivity / Antistatic• IR-Absorption / IR-Reflection• Fluorescence• Gas Barrier• Flame retardency• Magnetic properties• Carrier• ……

25%

6%

6%12%6%

45%

Scratch resistance Water-repellenceUV Protection Self cleaningAntimicrobial Others

Source: IRL

• TiO2

• Al2O3

• SiO2

• ZnO• Fe2O3

• CeO2

• CuO• ATO, ITO • Ag• ZrO2

• etc.

ZnO

TRANSPARENT!

Scratch resistance, UV Protection, Antimicrobial

Nanomaterials in coatings

Synthesis of nanomaterials

vezivo

Titanium dioxide (TiO2):

• micronized – white pigment

nano TiO2

ANATASEPhotocatalytic effect

RUTILEUV-protection

Nano rutile TiO2 transparent

formulation for wood UV protection

TiO2

cotrolWith nano rutile TiO2

ZnO for UV protection

Photocatalytic activity of TiO2

ANATASE

water contact angles of the surfaces before and after titania film deposition upon day-light illumination

without TiO2 with TiO2 thin film

Nanoadditives to improve Scratch Resistance

without nano SiO2

3,8% nano SiO2

After TA abrasion test After reflow efect

Inorganic nanoparticles are difficult to stabilize in dispersion and in the resin.

Compatibility problems during processing: agglomeration, turbidity, increased viscosity

Limitating scope of applicability

Coated metal oxides (example from flame synthesis)

TiO2

SiO2

Nanoparticle functionalization

John Texter et al . 2009

Gerhard Jonschker et al , Merck KGaA,Si O Si

O

SiOSiH3

OO

O

Si

Si

O

SiO

O

O Si

O

O

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

F

i-Oc(H2C)3NH2

i-Oc

i-Oc

i-Oc(H2C)3NH2

M. Steinbücher et al. HeliosM. Steinbücher et al. Helios

Easy to clean surfaces: wetting bahaviour

Inka Henze, Schott AG

Hydrophobic silane surface

Bioinspired materials for self-cleaning and self-healing

Mechanical stabilityregenaration of nano structure is a challenge

On awnings finished with Mincor® TX TT, dirt and water simply roll off - without leaving a trace.

Cho, S.H., White, S.R. and Braun, P.V., Self-Healing Polymer Coatings, Advanced Materials 21, 645-649 (2009).

Self-healing coatings for corrosion protection

Estimated cost of corrosion 300 billion USD per year

nanostructures diffract the light, interference eliminate all the colors except blue

Nature is beautiful!