Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (1): 109-116.DOI: 10.11944/j.issn.1000-0518.2020.01.190200

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Preparation and Stability of Silica Coated Bismuth-Based Yellow Pigments

WANG Zhumeia,LI Yueminga*(),WAN Detianab*(),ZUO Jianlina,SHEN Zongyanga,LI Kaia   

  1. aSchool of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen,Jiangxi 333001,China
    bState Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China
  • Received:2019-07-17 Accepted:2019-10-14 Published:2020-01-08 Online:2020-01-08
  • Contact: LI Yueming,WAN Detian
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51462010)

Abstract:

Silica coated bismuth-based yellow pigments with better acid resistance and temperature stability were successfully prepared by hydrolysis method using Bi0.82V0.45Mo0.55O4 and Na0.5Bi0.5(MoO4) prepared by precipitation method. The as-obtained pigments were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), X-ray fluorescence spectrometer(XRF) and Fourier transform infrared spectroscopy(FT-IR). The results showed that compact and uniform amorphous SiO2·xH2O coating layers with the thickness of around 100 nm were obtained under the volume ratio of H2O to TEOS was 18, the ratio of n(Si)/n(Bi) was 4, Tb was 45 ℃, and vd≤0.3 mL/min. The coated pigments showed the nature of bright yellow, and the values of L*, a* and b* were 78.85, -6.85 and 71.63, respectively. Compared with the uncoated pigments, the acid mass loss of coated pigments under the most optimized condition, after half an hour immersion in 1 mol/L hydrochloric acid, declined from 100% to 28.25% and the tolerable temperature was improved from 600 ℃ to 860 ℃.

Key words: molybdenum bismuth vanadate, yellow pigment, SiO2, coated pigment, stability