Environmentally Benign Solution‐Based Procedure for the Fabrication of Metal Oxide Coatings on Metallic Pigments,ChemistryOpen

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Environmentally Benign Solution‐Based Procedure for the Fabrication of Metal Oxide Coatings on Metallic Pigments
ChemistryOpen ( IF 2.5 ) Pub Date : 2020-12-10 , DOI: 10.1002/open.202000223
Thorsten Bies ₁ , Rudolf C Hoffmann ₁ , Matthias Stöter ₂ , Adalbert Huber ₂ , Jörg J Schneider ₁

Affiliation

Aluminum pigments were coated with Fe₂O₃ and CuO by solution‐based thermal decomposition of the urea nitrate compounds hexakisureairon(III)nitrate and tetrakisureacopper(II)nitrate. The deposition process was optimized to obtain homogeneously coated aluminum pigments. The growth of the surface coatings was controlled by investigation with scanning electron microscopy, energy dispersive X‐ray spectroscopy and static light scattering as well as infrared, X‐ray diffraction and thermogravimetric analysis. The iron precursor showed an incomplete decomposition in solution, incorporating traces of urea molecules inside the coatings while the copper precursor showed complete dissociation accompanied by in situ formation of amine complexes. The amount of organic residues resulting from ligand fragments in the final oxide coatings could be reduced to 22 % for the iron oxide and 12 % for the copper oxide by further temperature treatment in solution (259 °C). Colorimetric investigations of the obtained pigments revealed an excellent hiding power, outperforming the pigments used in current state‐of‐the‐art formulations.

中文翻译：

基于环境友好的溶液的金属颜料金属氧化物涂层的制备方法

通过尿素硝酸盐化合物硝酸六脲 (III) 和硝酸四脲 (II) 的溶液热分解，在铝颜料上涂覆 Fe ₂ O ₃和 CuO。优化沉积工艺以获得均匀涂覆的铝颜料。通过扫描电子显微镜、能量色散 X 射线光谱和静态光散射以及红外、X 射线衍射和热重分析的研究来控制表面涂层的生长。铁前体在溶液中表现出不完全分解，在涂层内掺入痕量尿素分子，而铜前体表现出完全解离，并伴有胺络合物的原位形成。通过在溶液中进一步进行温度处理（259°C），最终氧化物涂层中由配体片段产生的有机残留物的量可减少至氧化铁的22%和氧化铜的12%。对所得颜料的比色研究显示出优异的遮盖力，优于当前最先进配方中使用的颜料。

更新日期：2020-12-10

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