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  • Preparation of a microsphere SiO2/TiO2 composite pigment: The mechanism of improving pigment properties by SiO2

    Author(s)
    Sun, Sijia
    Ding, Hao
    Wang, Jie
    Li, Wei
    Hao, Qiang
    Griffith University Author(s)
    Hao, Derek
    Year published
    2020
    Metadata
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    Abstract
    In this study, a microsphere SiO2/TiO2 composite pigment (M-SiO2/TiO2) was prepared through a facile grinding and calcination process. The structure and properties of M-SiO2/TiO2 were characterized in detail, and the mechanism governing the improvement of pigment properties by M-SiO2 was proposed. The results of this study show that M-SiO2 and TiO2 are successfully compounded, and their combination is inferred to be achieved by the formation of Si-O-Ti bonds through the hydroxyl groups on their surface. The M-SiO2/TiO2 has almost the same pigment properties as pure titanium dioxide, while the weight fraction of TiO2 in ...
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    In this study, a microsphere SiO2/TiO2 composite pigment (M-SiO2/TiO2) was prepared through a facile grinding and calcination process. The structure and properties of M-SiO2/TiO2 were characterized in detail, and the mechanism governing the improvement of pigment properties by M-SiO2 was proposed. The results of this study show that M-SiO2 and TiO2 are successfully compounded, and their combination is inferred to be achieved by the formation of Si-O-Ti bonds through the hydroxyl groups on their surface. The M-SiO2/TiO2 has almost the same pigment properties as pure titanium dioxide, while the weight fraction of TiO2 in M-SiO2/TiO2 is 70%, which can significantly reduce the consumption of TiO2. In M-SiO2/TiO2, the introduction of M-SiO2 leads to the improvement of the rutile-phase conversion of TiO2, as well as reducing TiO2 particle size; thus, this step can further improve the pigment properties. When the calcination temperature is 900 °C, the TiO2 in M-SiO2/TiO2 is primarily rutile (rutile conversion rate is 88.57%) with a particle size of 0.1-0.3 μm, exhibiting good dispersion. In contrast, pure TiO2 is primarily composed of anatase (rutile conversion rate is 11.39%) with a particle size of 0.2-0.6 μm, exhibiting serious agglomeration. The M-SiO2/TiO2 composite is expected to be applied in the fields of paint, plastic, and papermaking in an effort to significantly reduce the cost and consumption of TiO2 pigment.
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    Journal Title
    Ceramics International
    Volume
    46
    Issue
    14
    DOI
    https://doi.org/10.1016/j.ceramint.2020.06.068
    Subject
    Chemical sciences
    Creative arts and writing
    Engineering
    Science & Technology
    Materials Science, Ceramics
    SiO2
    Publication URI
    http://hdl.handle.net/10072/412052
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