Method for preparing cobalt blue material for decorating ceramic

Abstract

The invention relates to a method for preparing a cobalt blue material for decorating ceramic. In the method, industrial pure chemical raw materials are adopted; and the method comprises the following steps of: mixing 22 to 45 weight percent of cobalt sesquioxide, 48 to 70 weight percent of aluminum sesquioxide, 0 to 10 weight percent of zinc oxide, 0 to 10 weight percent of magnesium carbonate and 0 to 4 weight percent of chromium sesquioxide; adding 2 to 4 weight percent of boric acid and 6 to 10 weight percent of nucleating agent and uniformly mixing to obtain a reactant; adding acetone in an amount which is 80 percent based on the weight of the reactant; and performing quick ball-milling, drying, baking at the temperature of between 1,100 and 1,200 DEG C, preserving heat, naturally cooling, grinding, cleaning and sieving to obtain the color material. In the method, a large amount of nucleating agent with a small grain size is added into the solid-phase reactant in advance to ensure that crystal simultaneously grows in and on the surface of the reactant, so the grain size of the color material is controlled well, the crystallization completeness is improved, the solid-phase firing temperature is reduced, the firing time is shortened, the acid resistance of the color material is enhanced, and the defects of the conventional solid-phase method for preparing the ceramic color material are overcome.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials (ceramics), and in particular relates to a preparation method of cobalt blue material for ceramic decoration. Background technique [0002] Blue is one of the three primary colors of red, green and blue, and many colors are indispensable. In the decoration of ceramics, cobalt blue has always been the main color of ceramic decoration. It is widely used in daily use, construction and sanitary porcelain. The degree requirement is 1-30μm. [0003] Most of the traditional cobalt blue materials are CoO-ZnO-SiO with willemite structure 2 System and spinel structure of CoO-Al 2 o 3 system. The dark blue pigment on glaze prepared by the former and lead flux is very bright in color and high in color saturation. Most of the lithographic and silk screen decal papers for domestic overglaze color porcelain use this kind of pigment, but its acid resistance is poor, and the amount of lead diss...

AI Technical Summary

Problems solved by technology

Therefore, it is an indisputable fact in the industry that commercially available cobalt blue pigments have poor acid resistance and lead leaching exceeds the standard. Improving the acid resistance of cobalt blue pigments has become an urgent problem to be solved in the ceramic industry.

[0004] Chinese researchers have been studying the problem of poor acid resistance of cobalt blue materials since the 1980s, but so far no cobalt blue materials with good acid resistance for ceramic decoration have been seen in the market

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