Preparation and characterization of scratch and mar resistant waterborne epoxy/silica nanocomposite clearcoat |
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| Authors: | Songwei Chen Bo You Shuxue Zhou Limin Wu |
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| Affiliation: | Department of Materials Science and Advanced Coatings Research Center of China, Educational Ministry, Fudan University, Shanghai 200433, P.R. China |
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| Abstract: | Colloidal nano‐silica particles were used to improve the scratch and mar resistance of waterborne epoxy coatings by directly blending. To enhance the compatibility of nano‐silica particles within polymer matrix, nano‐silica particles were first modified with 3‐glycidoxypropyl‐trimethoxysilane (GPTMS) and characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). The modified nano‐silica particles were found to have a better dispersion and compatibility in the polymer matrix than the unmodified nano‐silica particles. Macro‐scratch and nano‐scratch testers were employed to characterize the scratch and mar resistances of the nanosilica‐reinforced epoxy coatings. Relative to unmodified nano‐silica, GPTMS‐modified nano‐silica particles can improve the scratch and mar resistance more significantly and reduce the transparency and gloss of waterborne epoxy coatings less seriously. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 |
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| Keywords: | blending epoxy coatings silica nanocomposites scratch resistance |
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