Zirconium silicate covered cadmium selenide sulfide pigment for ceramic inkjet printing or ceramic dry blending and preparation method thereof

Abstract

The invention discloses zirconium silicate covered cadmium selenide sulfide pigment for ceramic inkjet printing or ceramic dry blending and a preparation method thereof. The preparation method comprises the following steps: firstly, slowly dropwise adding a water glass or sodium silicate solution into strong acid to form a weak acidic solution with the pH (Potential of Hydrogen) of 2 to 4; slowlydropwise adding weak alkali into a strong acidic mixed solution of zirconium oxychloride, cadmium sulfate, thiourea and ammonium fluoride to form a weak acidic solution with the pH of 2 to 4; then mixing the two weak acidic solutions and adding ultrafine selenium powder and a dispersant to form semi-transparent gel; drying and calcining to obtain the pigment for the ceramic inkjet printing; addingtrace metal ions into the mixed solution to further control the granularity of the pigment, and carrying out surface modification to obtain the ceramic for the ceramic dry blending. According to thezirconium silicate covered cadmium selenide sulfide pigment disclosed by the invention, a condition that reaction cannot be controlled when direct contact between strong acid and strong alkali is violent is avoided, so that reactants are blended in a molecule grade under a solution state to form the gel with extremely high reaction activity and the calcining temperature of about 200 DEG C is reduced; the pigment has small granularity and the environment protection and production and safety advantages are remarkable.

Description

technical field [0001] The invention belongs to the field of ceramic pigments, and in particular relates to a preparation method for coating cadmium sulfoselenide pigments with zirconium silicate for ceramic inkjet printing or ceramic dry mixing, so as to realize the control of the particle size of the pigments and the surface modification of the pigments. technical background [0002] Ceramic pigments refer to a class of high-temperature and corrosion-resistant inorganic pigments used for coloring ceramic bodies or glazes. There are many types, different colors, chemical compositions and mineral structures. Red ceramic pigments are one of them. , including iron zirconium red, chrome aluminum red, manganese red, chromium tin red, etc., but only one kind of inorganic pigment that can show bright red or Chinese red color is cadmium sulfur selenide pigment. Due to its chemical composition and structure, cadmium sulfur selenide pigment is not resistant to high temperature oxidat...

AI Technical Summary

Problems solved by technology

The ceramic dry mixing process requires the particle size of the pigment to be as close as possible to 1-5 microns, and has good fluidity, dispersion and strong coloring ability. Ordinary ceramic pigments can meet the requirements through simple grinding, crushing and surface modification. However, due to the special double-layer structure of zirconium silicate cadmium sulfoselenide, the coated pigment has the characteristics of large specific gravity, coarse particles, resistance to grinding, and high price, so it is difficult to directly use it as a ceramic dry-mixed pigment.

[0005] Solid-phase method, liquid-phase precipitation method, sol-gel method, and hydrothermal method can all synthesize cadmium sulfoselenide-coated pigments, but due to cost, yield and practical problems, solid-phase method, sol-gel method, and hydrothermal method cannot It is not suitable for large-scale production (the color of the coated pigment obtained by the solid phase method is very light, the sol-gel method needs to use a large amount of metal alkoxide and the cost is high, and the output of the hydrothermal method is too small to be economical). Phase precipitation synthesis, the basic process is to directly drop the solution of strongly acidic zirconium oxychloride and cadmium sulfate and the solution of strongly alkaline sodium sulfoselenide and sodium silicate into water to form a precipitate, and then mix The precipitate is processed by complex processes such as washing, drying, calcination, and acid soaking to obtain wrapped pigment products

However, in this process, the direct mixing of strong acid and strong alkali solution makes the pH fluctuate violently during the reaction process, and the particle size and state of the precipitate are difficult to control, resulting in a large amount of cadmium sulfoselenide exposed outside the zirconium silicate inclusions after calcination. The later strong acid acid bubble treatment to dissolve excess cadmium sulfoselenide, resulting in a large amount of waste cadmium solution to be disposed of, greatly increasing environmental protection costs and production safety costs, while the synthetic coated pigments have a coarse particle size and cannot be controlled

Therefore, the cadmium sulfoselenide coated pigments synthesized by the traditional liquid phase precipitation method cannot meet the strict requirements of ceramic inkjet printing pigments or ceramic dry-mixed pigments.

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