Optimization mechanical properties of polyurethane/Sio2 nanocomposite on Polypropylene substrate for automotive clear coating by Taguchi method

Journal: Vol.8, No.4, 2015 - Article 4   Pages :  295 Until 307

Article Code:

Shahrzad Pashapour Yeganeh: Islamic Azad University, Tehran South Branch - Department of Polymer Engineering
Mohammadreza Kalaee: Tehran South Branch - Department of Polymer Engineering

Article's abstract:

The effect of different parameters including: nano silica content, curing temperature, type of hardener, and flash-off time on mechanical and optical properties of polyurethane PU based clearcoat was investigated via standard Taguchi L9 method. Dispersion of nano silica in the resultant nanocomposites was explored by scanning electron microscopy SEM. SEM images showed a fine dispersion through the nanocomposites at different loadings. All PU nanocomposites showed gloss in the range of 91-94 which confirms the presence of nano silica did not have an adverse impact on optical properties. Moreover, the most significant factor contributed in the hardness of samples was the nano silica content. It was shown that using high amount of nano silica 5 wt reduced hardness of clearcoats due to interrupting curing process. The clearcoats performance after carwash test indeed showed that sample containing 2 nano silica cured at 85oC with a mixture of hardener 50 biuret, 50 trimer after flash-off time of 5 min had the optimum physical and optical properties.

polyurethane, clearcoat, nano silica, Taguchi method

1. N. Tahmassebi, S. Moradian, Predicting the performances of basecoat/clearcoat automotive paint systems by the use of adhesion, scratch and mar resistance measurements, Polym Degrad Stabil., 83(2004), 405-410.#2. L. Lin, G. S. Blackman, R. R. Matheson, A new approach to characterize scratch and mar resistance of automotive coatings, Prog. Org. Coat ., 40(2000), 85-91.#3. J. Rey, M. Hartman, Clearcoats State of the Art, Scratch Resistance Coatings, Surcar, Cannes, , 2001.#4. B. Ramezanzadeh, S. Moradian, A. Khosravi, N. Tahmasebi, A new approach to investigate scratch morphology and appearance of an automotive coating containing nano-SiO2 and polysiloxane additives, Prog. Org. Coat.,. 72(2011), 541-552.#5. B. Ramezanzadeh, S. Moradian, N. Tahmasebi, A. Khosravi, Studying the role of polysiloxane additives and nano-SiO2 on the mechanical properties of a typical acrylic/melamine clearcoat, Prog. Org. Coat., 72(2011), 621-631.#6. N. Tahmasebi, S. Moradian, B. Ramezanzadeh, A. Khosravi, S. Behdad, Effect of addition of hydrophobic nano silica on viscoelastic properties and scratch resistance of an acrylic/melamine automotive clearcoat, Tribol Int., 43(2010), 685-693.#7. B. Ahmadi, M. Kassiriha, Kh. Khodabakhshi, E. R.Mafi, Effect of nano layered silicates on automotive polyurethane refinish clear coat, Prog. Org. Coat., 60(2007), 99-104.#8. M. Joulazadeh, A. H. Navarchian, Effect of process variables on mechanical properties of polyurethane/clay nanocomposites, Polym. Adv. Technol., 21(2010), 263-271.#9. M. Sabzi, S.M. Mirabedini, J. Zohuriaan-Mehr, M. Atai, Surface modification of TiO2nano-particles with silane coupling agent and investigation of its effect on the properties of polyurethane composite coating, Prog. Org. Coat., 65(2009), 222-228.#10. A. Dashtizadeh, M. Abdouss, H. Mahdavi, M. Khorassani, Acrylic coatings exhibiting improved hardness, solvent resistance and glossiness by using silica nano-composites, Appl. Surf. Sci., 257(2011), 2118-2125.#11. M.Groenewolt, Highly scratch resistant coatings for automotive applications, Prog.Org. Coat., 61(2008), 106-109.#12. H. Zhang, L. Zhou, C. Eger, Z. Zhang, Abrasive wear of transparent polymer coatings: Considered in terms of morphology and surface modification of nanoparticles, Compos. Sci. Technol., 88(2013), 151-157.#13. N. Amini, M. R. Kalaee, S. Mazinani, S. Pilevar, S. O. Ranaei-Siadat, Morphological optimization of electrospun polyacrylamide/MWCNTs nanocomposite nanofibers using Taguchi’s experimental design, Int J Adv Manuf Technol., 69(2013), 139-146.#14. K. R. Roy, Design of experiments using Taguchi approach: 16 steps to product and process improvement, John Wiley & Sons., New York, 2001.#15. T. Zhang, W. Wu, X. Wang, Y. Mu, Effect of average functionality on properties of UV-curable waterborne polyurethane-acrylate, Prog. Org. Coat., 68(2010), 201-207.#16. M. Horgnies, E. Darque-Ceretti, Study of siloxane additives migration to the surface of polyester-(melamine)-polyurethane coatings: Aging effects after ethanol cleaning, Prog. Org. Coat., 55(2006), 27-34.#17. T. A. Thorstenson, J. B. Huang, M. W. Urban, Mobility and distribution of silicone additives in coatings; a spectroscopic study, Prog. Org. Coat,. 24(1994), 341-358.#18. M. Horgnies, E. Darque-Ceretti, R. Combarieu, Influence of additives segregation on surface composition of automotive coatings: effects of an ethanol cleaning, Prog. Org. Coat., 47(2003), 154-163.#19. I. Neitzel, V. Mochalin, I. Knoke, G. R. Palmese, Y. Gogotsi, Mechanical properties of epoxy composites with high contents of nanodiamond, Compos. Sci. Technol., 71(2011), 710-716.#20. P. Krol, B. Atamanczuk, J. Plellchowskl, Kinetic study of the polycondensation of diisocyanates with polyols, J. Appl. Polym. Sci., 46(1992), 2139-2146.

Article's file
Page view: 2552
Article's download quantity : 44

Article System Login

Prof. Zahra Ranjbar
Dr. Farahnaz Nourmohammadian
Assistant Editor:
Dr. Mozhgan Hosseinnezhad
ISSN (online):
Institute for Color Science and Technology (ICST)

Quick Access
What is your opinion about the manuscript subscription system of PCCC website?
Website Statistics
Page view:2,553
Online Visitors:21