Hydrothermal preparation method of mullite coated particles

Abstract

The invention discloses a hydrothermal preparation method of mullite coated particles. The preparation method comprises the following steps: mixing a precursor component of to-be-coated particles withan aluminum source or a silicon source, carrying out hydrothermal reaction to generate precipitates, sequentially adding the precursor component, the silicon source or the aluminum source, and carrying out hydrothermal reaction to obtain mullite-coated particles. According to some embodiments of the invention, the hydrothermal synthesis of the mullite coated particles is realized for the first time, and the preparation of the low-cost coated particles is facilitated. Particularly, in the prepared mullite-coated cadmium selenide sulfide pigment, the cadmium selenide sulfide chromophoric core is uniformly dispersed in the inclusion, so that no cadmium is left externally; meanwhile, the whole synthesis environment is carried out in a sealed hydrothermal kettle, so that no waste gas or sewageis discharged, and the process is green and environment-friendly no matter in the production process or in the final product.

Description

technical field [0001] The invention relates to a preparation method of a wrapping material, in particular to a hydrothermal preparation method of mullite-wrapped particles. Background technique [0002] Wrapped granular materials generally consist of a core material and a protective layer that wraps the core material. In the ceramic inkjet printing industry, packaged colorants can avoid the normal color development of high-temperature unstable colorants and improve their coloring effect, so that the use temperature range of colorants can be increased, and more and more people pay attention to them. [0003] The existing coated particles mainly include classic coated particles such as silica coated particles and zirconium silicate coated particles. However, such wrapping materials as silicon dioxide and zirconium silicate also have certain deficiencies, and the preparation process is relatively complicated, or the cost is relatively high. [0004] Mullite (or mullite, Alum...

AI Technical Summary

Problems solved by technology

For ordinary ceramic pigments, simple physical grinding and crushing can make the particle size meet the requirements of the ink, but cadmium sulfoselenide must be protected by the package shell to turn red at a high temperature of 1200 ° C, physical grinding will cause damage to the package shell and cause bright red Pigment failure, so the traditional method of grinding and crushing to reduce the particle size is not suitable for wrapping red pigments, which requires that the original particle size of the wrapped pigments is already below 1 micron at the beginning of synthesis

It can be seen from this that if the mullite-coated cadmium sulfide selenide pigment can also be used in ceramic inkjet printing inks, it is also necessary to ensure that the original particle size of the pigment after synthesis is less than 1 micron, and the technical difficulty will be even greater.

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