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    • 5. 发明授权
    • Process for producing coated bismuth vanadate yellow pigments
    • 涂覆的钒酸铋黄色颜料的制备方法
    • US5851587A
    • 1998-12-22
    • US585123
    • 1996-01-11
    • Hans-Joachim SchittenhelmRudolf Hill
    • Hans-Joachim SchittenhelmRudolf Hill
    • C08K3/00C09C1/00C09C3/00C09C3/06C09D7/12B05D7/00C04B14/00
    • C09D7/1275C09C1/0006C09C3/006C09C3/063C09D7/1225C09D7/1283C01P2004/61C01P2004/88C01P2006/12C08K3/0033C08K9/02
    • The present invention relates to a process for producing coated bismuth vanadate yellow pigments comprising the following steps: (a) subjecting a reaction mixture comprising a suspension in nitric acid of bismuthyl nitrate and vanadium (V) oxide, or a suspension in nitric acid of bismuth (III) oxide and vanadium (V) oxide, to stirring to form bismuth vanadate particles; (b) terminating the stirring and holding the reaction mixture for a period of time; (c) filtering off the bismuth vanadate particles; (d) washing the bismuth vanadate particles; (e) dispersing the washed bismuth vanadate particles in a hot, phosphate-containing, aqueous solution to activate the surface of the particles; (f) filtering off the activated bismuth vanadate particles; (g) washing the activated bismuth vanadate particles; (h) dispersing the activated bismuth vanadate particles in water to form a suspension; (i) precipitating at least one material selected from the group consisting of hydrated aluminum phosphate, aluminum/zinc phosphate or silicon oxide onto the external surface of the activated bismuth vanadate particles in the suspension to form said coating; (j) filtering off the coated bismuth particles; (k) washing and drying the coated bismuth vanadate particles.
    • 本发明涉及一种制备涂覆的钒酸铋黄色颜料的方法,包括以下步骤:(a)使含有硝酸铋硝酸盐和氧化钒(V)的硝酸的悬浮液或铋的硝酸悬浮液 (III)氧化物和钒(V)氧化物,搅拌形成钒酸铋颗粒; (b)终止搅拌并保持反应混合物一段时间; (c)过滤掉钒酸铋颗粒; (d)洗涤钒酸铋颗粒; (e)将经洗涤的钒酸铋颗粒分散在含热磷酸盐的水溶液中以活化颗粒的表面; (f)过滤掉活化的钒酸铋颗粒; (g)洗涤活化的钒酸铋颗粒; (h)将活化的钒酸铋颗粒分散在水中以形成悬浮液; (i)将悬浮液中活化的钒酸铋颗粒的外表面上的至少一种选自水合磷酸铝,磷酸铝/磷酸锌或氧化硅的材料析出,形成所述涂层; (j)过滤掉涂覆的铋颗粒; (k)洗涤和干燥涂覆的钒酸铋颗粒。