OJAppS  Vol.5 No.12 , December 2015
Development and Evaluation of Nano-Silica Dispersed Polyurethane Based Coatings for Improved Anti-Graffiti and Scratch Resistance
ABSTRACT
Polyurethane based anti-graffiti coatings have been developed by incorporating varying amounts of OH-functional Silicone modified polyacrylate. Optimization of Silicone polyacrylate concentration in neat PU was done by testing its performance for graffiti resistance. Tests which include static contact angle measurements with water and spray paint, visual inspection of stain removal and color change measurements were performed. It was observed that 5 wt % of Silicone polyacrylate in the neat PU showed 95% stain removability. These coatings showed excellent graffiti resistance but poor mechanical properties. Hence modification of these coatings was done by nano-particle incorporation. Nano-silica particle concentration was optimized for surface mechanical properties such as surface hardness, elastic modulus and scratch resistance. FEG-TEM revealed that nano-silica particles were uniformly distributed over the surface. 5 wt % nano-silica particle additions in PU-5 wt % silicone polyacrylate base showed superior mechanical properties than other concentrations. Color change measurements showed that nano-silica particle addition had no effect on its graffiti resistance. Hence PU-5 wt % silicone polyacrylate, 5 wt % nano-silica showed excellent graffiti resistance and mechanical properties.

Cite this paper
Adapala, P. , Gaur, S. , Puri, R. and Khanna, A. (2015) Development and Evaluation of Nano-Silica Dispersed Polyurethane Based Coatings for Improved Anti-Graffiti and Scratch Resistance. Open Journal of Applied Sciences, 5, 808-818. doi: 10.4236/ojapps.2015.512077.
References
[1]   Liu, H. (2013) Anti Graffiti Polyurethane Coating Containing Fluorocarbon Side Chains Grafted Polymethylsiloxane. Journal of Coatings Technology and Research, 10, 361-369.
http://dx.doi.org/10.1007/s11998-012-9452-4

[2]   Rabea, M. (2011) Investigating the Surface Properties of Polyurethane Based Anti-Graffiti Based Coatings against UV Exposure. Wiley Online Library.

[3]   Gommans, L. (2000) Recent Advances in Polysiloxane Coatings. Corrosion Prevention and Control, 1, 72-82.

[4]   Feng, L.L., Zhang, X.Y., Dai, J.B., Ge, Z., Chao, J. and Bai, C.Y. (2008) Synthesis and Surface Properties of Polyurethane Modified by Polysiloxane. Frontiers of Chemistry in China, 3, 1-5.
http://dx.doi.org/10.1007/s11458-008-0001-8

[5]   Rabea. M.. et al. (2012) Surface Analysis and Anti-Graffiti Behaviour of a Weathered Polyurethane-Based Coating Embedded with Hydrohphobi Nano Silica. Applied Surface Science, 258, 4391-4396.
http://dx.doi.org/10.1016/j.apsusc.2011.12.123

[6]   Dhoke, S.J. (2009) Effect of Nano-Alumina Particles on the Corrosion Behavior of Alkyd Based Waterborne Coatings. Coatings Technology, 6, 353-368.

[7]   Swain, S., et al. (2013) Effects of Nano-Silica/Nano-Alumina on Mechanical and Physical Properties of Polyurethane Composites and Coatings. Transactions on Electrical and Electronic Materials, 14, 1-8.

[8]   Rabea, A.M., Mohseni, M. and Mirabedini, S.M. (2011) Investigating the Antigraffiti Properties of a Polyurethane Clearcoat Containing a Silicone Polyacrlate Additive. Journal of Coatings Technology and Research, 8, 497-503.

[9]   Wankhede, R.G. (2013) Development of Hydrophobic Inorganic-Organic hybrid Sol-Gel Coatings on Aluminium Using Nano Particles. IIT Bombay.

[10]   Tarnowski, A., et al. (2007) Biodeterioration and Performance of Anti-Graffiti Coatings on Sandstone and Marble. Journal of ACCR, 32, 3-16.

[11]   Wypych, G. (2003) Handbook of Material Weathering. ChemTec Pub., Toronto.

[12]   Ghermezcheshme, H., Mohseni, M. and Yahyaei, H. (2015) Use of Nanoindentation and Nanoscratch Experiments to Reveal the Mechanical Behavior of POSS Containing Polyurethane Nanocomposite Coatings: The Role of Functionality. Tribology International, 88, 66-75.
http://dx.doi.org/10.1016/j.triboint.2015.02.023

[13]   Lettieri, M. and Masieri, M. (2014) Surface Characterization and Effectives Evaluation of Anti-Graffiti Coatings on Highly Porous Stone Materials. Applied Surface Science, 288, 466-477.
http://dx.doi.org/10.1016/j.apsusc.2013.10.056

[14]   Barna, E. (2010) Synthesis and Characterization of Scratch Resistant Polyurethane Clear Coatings by Incorporation of Surface Modified Nanoparticles. University of Basel, Zurich.

[15]   Chu, J., et al. (2000) Scratch Resistance of Mineral-Filled Polypropylene Materials. Polymer Engineering and Science, 40, 944-955. http://dx.doi.org/10.1002/pen.11222

 
 
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