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<p>Waterborne aluminum flake composite pigments (Al@KH550@SiO<sub>2</sub>@SA) were prepared by successively encapsulating aluminum flakes with hydrolyzed γ-aminopropyl triethoxysilane (KH550) inside nanolayer, SiO<sub>2</sub> intermediate inorganic nanolayer, and stearic acid (SA) outside organic layer. Hydrolyzed KH550 nanoparticles anchored at the surfaces of Al flakes via Si–O–Al bonding, SiO<sub>2</sub> nanoparticles anchored at the hydrolyzed KH550 nanolayers via Si–O–Si bonding, and stearic acid molecules anchored at the SiO<sub>2</sub> intermediate nanolayers via the interaction between carboxylic groups and surface –OH groups. The encapsulation of SiO<sub>2</sub> intermediate nanolayer using environmentally friendly silica sol precursor obviously improved the anticorrosion performance of resultant composite pigments. The encapsulation of stearic acid outside organic layer endowed the composite pigments with good water floating performance. The lightness, brightness, and whiteness of encapsulated aluminum flake composite pigments are comparable to those of solventborne aluminum flake pigment.</p>

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Encapsulation of aluminum flakes with KH550, silica sol, and stearic acid for the preparation of waterborne Al@KH550@SiO2@SA composite pigments

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Aili Wang,
  • Chen Zhao,
  • Hengbo Yin,
  • Wei Yuan

摘要

Waterborne aluminum flake composite pigments (Al@KH550@SiO2@SA) were prepared by successively encapsulating aluminum flakes with hydrolyzed γ-aminopropyl triethoxysilane (KH550) inside nanolayer, SiO2 intermediate inorganic nanolayer, and stearic acid (SA) outside organic layer. Hydrolyzed KH550 nanoparticles anchored at the surfaces of Al flakes via Si–O–Al bonding, SiO2 nanoparticles anchored at the hydrolyzed KH550 nanolayers via Si–O–Si bonding, and stearic acid molecules anchored at the SiO2 intermediate nanolayers via the interaction between carboxylic groups and surface –OH groups. The encapsulation of SiO2 intermediate nanolayer using environmentally friendly silica sol precursor obviously improved the anticorrosion performance of resultant composite pigments. The encapsulation of stearic acid outside organic layer endowed the composite pigments with good water floating performance. The lightness, brightness, and whiteness of encapsulated aluminum flake composite pigments are comparable to those of solventborne aluminum flake pigment.