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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.

    2

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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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