Abstract
Two kinds of TiO2 filled epoxy coatings were designed and prepared to obtain pigments with different dispersion degrees of TiO2 particles. Laser scanning confocal microscope (LSCM) was used to investigate both the horizontal and vertical distributions of TiO2 particles in the coatings. The results indicated that TiO2 in the two samples shared considerable similarity in horizental dispersion, but exhibited great difference in vertical dispersion. TiO2 showed uniform vertical distribution in disp coating, wheras a gap about 1.1 μm was found in the non-disp coating, which significantly influenced the surface optical properties of the coatings during weathering. Based on the confocal data, the model of dispersion of pigments in the coatings was proposed and the change of surface properties during weathering was predicted: the surface optical properties showed an initial decrease followed by a subsequent increase, which was in good agreement with the weathering data.
Similar content being viewed by others
References
Gong Z, Yao Z. Comparison of cathodic disbondment of coatings with scale fillers. Corros Protect, 2007, 28: 573–575
Schuman T, Karlsson A, Larsson J, et al. Characteristics of pigment-filled polymer coatings on paperboard. Prog Org Coat, 2005, 54: 360–371
Kunaver M, Gunde M K, Mozetic M, et al. The degree of dispersion of pigments in powder coatings. Dyes Pigments, 2003, 57: 235–243
Clerici C, Gu X, Stutzman P, et al. Effect of pigment dispersion on durability of a TiO2 pigmented epoxy coating during outdoor exposure. In: Proceeding 4th International Symposium on Service Life Prediction of Coatings. Key Largo, FL, 2006
Jinnai H, Yoshida H, Hashimoto T, et al. Observation of fine structure in bicontinuous phase-separated domains of a polymer blend by laser scanning confocal microscopy. Macromol, 2001, 34: 5186–5191
Moffitt M, Rharbi Y, Winnik M A. Surface-directed morphology evolution in ternary blends of polyethylene, polypropylene, and ethylene-propylene copolymer: A study by laser scanning confocal fluorescence microscopy. J Polym Sci, Part B: Polym Phys, 2003, 41: 637–654
Zhang C, Dong X, Wang D, et al. Three-dimensional observation of the phase structure of high density polyethylene (HDPE)/poly (ethy leneco-butene) (PEB) blend by laser scanning confocal microscopy. Chinese Sci Bull, 2007, 52: 2042–2047
Rutter E G. Rutile titanium oxide in decorators’hard gloss paints. J Oil Colour Chem Assoc, 1945, 28: 187–201
Colling J H, Dunderdale J. The durability of paint films containing titanium dioxide—contraction, erosion and clear layer theories. Prog Org Coat, 1981, 9: 47–84
Wilson T. Confocal Microscopy. London: Academic Press, 1990
Sung L, Gu X, Clerici C, et al. Effect of Pigment Dispersion on Optical Properties and Durability of a TiO2 Pigmented Epoxy Coating, in ACS 1004 / Polymer Degradation and Performance. Washington: American Chemical Society/ Oxford Press, 2009. 276–286
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Hu, H., Zhang, C., Han, C.C. et al. Dispersion of particles in the coatings characterized by laser scanning confocal micrscopy (LSCM) I: Vertical dispersion of particles in the coatings and the weathering property studied by orthogonal analysis method of LSCM. Sci. China Technol. Sci. 53, 2247–2251 (2010). https://doi.org/10.1007/s11431-009-3164-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11431-009-3164-8