A kind of superfine package type cadmium sulfur selenide ceramic pigment and preparation method thereof

Abstract

The invention discloses a preparation method of an ultra-fine packaged cadmium sulfide selenide ceramic pigment. The steps are: 1) dissolving cadmium salt and surfactant in water to obtain solution A, dissolving sodium sulfide and selenium in water to obtain alkaline solution, dropping solution A into the alkaline solution to obtain cadmium sulfide selenide precursor, and then Carry out hydrothermal reaction to obtain dispersed cadmium sulfide selenide; 2) add water glass solution to acid solution, control pH to obtain silicic acid solution; 3) add dispersed cadmium sulfide selenide to zirconium oxychloride dispersion liquid, add silicon Acid solution, adjust the concentration of silicon ions and zirconium ions, adjust pH, and heat to obtain gel; 4) After drying the gel, mix it with a mineralizer, and calcine to obtain an ultra-fine packaged cadmium sulfide selenide ceramic colorant . The particle size D100 of the colorant prepared by the method is less than 1.3 μm, and the controllable and reproducible conditions of the method are very good, which is very suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of packaged ceramic pigments, in particular to an ultrafine packaged cadmium sulfur selenide ceramic pigment and a preparation method thereof. Background technique [0002] Encapsulated ceramic pigments are a typical application of encapsulation technology in the preparation of ceramic pigments. Due to the high firing temperature of ceramic products (1000-1250°C), the pigments used in ceramic products not only require strong color development ability and pure color tone, but also have better thermal stability within the firing temperature range. , can withstand the erosion of glass melt. Many inorganic compounds in nature have bright color and color rendering ability, such as cadmium sulfur selenide (red), cadmium sulfide (rhubarb) and carbon black. However, these inorganic pigments have poor high-temperature stability, and are generally completely oxidized or decomposed above 800°C. Therefore, the application of t...

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Problems solved by technology

[0005] CN108276805A discloses a zirconium silicate wrapped cadmium sulfoselenide pigment for ceramic inkjet printing or ceramic dry mixing and a preparation method thereof, wherein the average (D50) particle diameter of the disclosed zirconium silicate wrapped cadmium sulfide selenide pigment is less than 1 micron, Although it meets the particle size requirements of inkjet printing, in fact, in the silicon-zirconium system, when the pH is between 2 and 4, the two will undergo very rapid double hydrolysis, making the reaction very uncontrollable. And the selenium powder is also difficult to be well dispersed in the weakly acidic solution by the dispersant, which leads to the very poor reproducibility of the average particle size of the packaged colorant prepared by it, which makes it less than 1 μm in practical application or industrial production. Difficult to implement

[0006] Therefore, it is necessary to provide a method for preparing a packaged colorant with good reproducibility, easy implementation in industry, and a particle size that meets the requirements for use, but in fact how to control the preparation process and make it controllable and easy to control There are huge difficulties in making the particle size of the prepared packaged pigment stable within the range required for use

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