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Effect of structure-controlled aluminum silicate nanofiller on surface properties of emulsion coating films

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Abstract

A non-crystalline aluminum silicate related to allophane (i.e., clay mineral) was synthesized by a hydrothermal reaction after which the synthetic mineral was mixed with clear or multicolored aqueous emulsion paint as a nanofiller. The nanofiller was revealed by X-ray diffraction to have an amorphous morphology, showed a narrow particle size distribution with a volume mean diameter of 1.2 µm and indicated a specific surface area of 228 m2/g. Clear films prepared with the nanofiller had significantly improved wettability compared to a blank film. The results of outdoor exposure tests exhibited that multicolored films with the nanofiller showed higher antifouling ability than films with a commercially available silica filler. A proposed antifouling mechanism is that the proportion of Si-OH and Al-OH active sites exposed on the nanofiller surface had a significant effect on the surface wettability of the films and exquisitely controlled the sliding of rain droplets.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology, Shimo-Shidami, Moriyama, Nagoya, 463-8560, Japan

    Fumihiko Ohashi

  2. Fujikura Kasei Co., Ltd., 5-13-1 Sakurada, Kuki, Saitama, 340-0203, Japan

    Kenji Arai & Atsushi Shibahara

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  1. Fumihiko Ohashi
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  2. Kenji Arai
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  3. Atsushi Shibahara
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Correspondence to Fumihiko Ohashi.

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Ohashi, F., Arai, K. & Shibahara, A. Effect of structure-controlled aluminum silicate nanofiller on surface properties of emulsion coating films. J Coat Technol Res 19, 355–360 (2022). https://doi.org/10.1007/s11998-021-00541-6

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  • DOI: https://doi.org/10.1007/s11998-021-00541-6

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