nanotech painting
TRANSCRIPT
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Goutam Chowdhury
Prof.(Met)/IRIMEE
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What is Nanotechnology?
It is the technology where the particle size is inThe range of manometers i.e10-9meters.
Conventional technology uses particles inmacro size, occasionally in micron size, i.e. 10-6
meters.
Particle size below100 mm falls in the realm ofnanotechnology
Standard human hair diameter is about 4500nm.
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So what?
The surface area to volume ratio increasesmany fold. A micron size sphere, if convertedto nm size spheres yield 109 spheres withthousand times increase in surface area!
At near atomic size, these particles exhibit
many new physical properties governed byquantum phenomena. By exploiting these newproperties, various materials can be developedaiming at various specific applications.
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Functionally, any paint has two components: Pigments (mostly inorganic material particles to
impart desired colour)
Vehicle (mostly of organic origin forms a colourlessmonolithic layer adherents to the substrate. On thismonolithic layer, pigments are embedded to give thedesired colour effect )
The terms like Alkyd, Epoxy, PU etc. used for
different types of paint generally qualifiy the vehicle Other items added in paints like filler, thinner,
suspender, binder etc. are to improve workability,cost, storage, spreading properties etc.
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In Nano painting system
The pigments are of nano dimensions; thusimparting special properties as discussedearlier: The single most important characterbeing the increased Surface to Volume ratio
The vehicle also is changed to inorganic type;
Polysiloxane, Polysilazane etc., which arecompounds of Silicon, Nitrogen, Hydrogen andCarbon
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Because of nano dimensions and change inphysical properties, the pigment particles candisperse in much more compact fashion and
with much less cross section (DFT) can achievethe hiding property.
Typical DFT in nano paint is 30-50 micron ascompared to 250 microns in conventional paint
This leads to drastic reduction application timeand cost
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These compounds have structures similar toorganic compounds, only the carbon moleculesin backbone is replaced by silicon molecules.
This gives it very high resistance to UV lightand makes it ideal for outdoor applicationswith long service life
Compared to conventional material, it is more
scratch resistant and possesses much better antifungal /bacterial/algae properties
Absence of VOC makes the layer (film) moremonolithic and porosity free
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Effort to explore alternative painting system onLHB coaches to reduce cycle time
Technology for clear coat being used by
American Rail Road, Netherlands Railway, D-Bahn,BREL
First time in the world for Indian Railway withcoloured pigments
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Corrosion Protection
Minimal deterioration due to weather
Resistant to Acid
UV Protection Gas Barriers
Thermal Protection
Protection from graffiti
Protection from finger prints Easy Cleaning
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Trial done on one LHB Rajdhani shell Coach No. 3T-NR 08936/C
from 27.11.08 to 03.12.08
Trials done by M/s Clariant, Mumbai with
help of theirOEM in Germany free of cost
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Coach took seven days as against 14 days inLHB painting
Took 380 M.hrs. against 460 M.hrs. (LHB) for
complete coach painting Achieved Average Gloss Value of Top Coat
Signal Red 75
Grey 78.65
AVG of RCF LHB is 85,
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At a time, two of three activities goingsimultaneously against ours single activity
Less putty pot life
The mixture was prepared in small quantities (100-150 gms)
Scratch marks on the substrate did not hide properly
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RDSO to evaluate the results and monitor thesubject coach
Firm to
Provide samples of each component for furthertesting and evaluation
Clarify whether the painting can be done with RCFexisting system of airless spray and electro static
machines Clarify how to increase pot life of putty
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