Preparation method of zirconium silicate wrapped ceramic pigment

Abstract

The invention discloses a preparation method of zirconium silicate wrapped ceramic pigment. In the method, after preparation of a raw material solution and preparation of a precursor suspension, the precursor suspension is dried so as to obtain the precursor powder, and consequentially, the wrapped ceramic pigment is obtained through roasting. In the method, by optimization of formula and control on pigment granularity, the whiteness of the ZrSiO4 wrapping layer is reduced effectively, and the color generation effect of the ceramic pigment is improved; by the obtained high-density wrapping layer, the effective wrapping efficiency and stability of the ceramic pigment are improved, and thus, the color source is protected effectively.

Description

technical field [0001] The invention relates to the technical field of ceramic pigments, in particular to a preparation method of zirconium silicate wrapped ceramic pigments. Background technique [0002] For ceramic pigments that are not resistant to oxidation or easy to decompose at high temperature, a layer of high-temperature stable material is usually wrapped on the surface of the ceramic pigment to expand the application range of the ceramic pigment. Zirconium silicate ZrSiO 4 It has high temperature stability in most glazes, so it is usually used as a wrapping material to cover the surface of ceramic pigments in the prior art. For example, using ZrSiO 4 Wrapping cadmium selenium red can prevent the high temperature oxidation of cadmium selenium red; for the synthesis of non-toxic and harmless black ceramic pigment, ZrSiO 4 Encapsulation of carbon black ceramic pigments has become a new research hotspot in recent years. [0003] At present, in the preparation proce...

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Problems solved by technology

[0004] (1) ZrSiO 4 The crystal itself is white, and after completely covering the CdSe red or carbon black as the color source, the color of CdSe red or carbon black is shielded to a certain extent, thus causing the color to become lighter

In addition, the ZrSiO that fails to completely wrap the color source 4 The particles are completely white due to the loss of the color source. Mixing with the wrapped cadmium selenium red or carbon black material will also cause the color of the color material to become lighter

[0005] (2) SiO in the preparation process 2 Sol and ZrO 2 Sol mixing, during the transition from sol to gel, the solvent is retained in the gel structure, leaving voids as the solvent volatilizes during the drying process, resulting in ZrSiO 4 The structure of the cladding layer is loose and not dense, so that even the cadmium selenium red or carbon black particles can be covered by ZrSiO 4 package, but it cannot protect the cadmium selenium red or carbon black particles well, and cannot effectively isolate oxygen

[0006] For the above-mentioned problems, the prior art also solves ZrSiO by removing the solvent quickly during the preparation process to reduce the void ratio. 4 The problem of loose and non-dense structure of the coating layer, although this reduces the L* value of the coating carbon black material to a certain extent and improves the blackness of the color material, still does not solve the problem of ZrSiO 4 The influence of the white color of the crystal itself on the coloring of the packaged pigment is still difficult to obtain the ideal coloring effect

In addition, in the prior art, for the initial powder obtained by synthesis, secondary crushing and then calcination are usually required, which damages the structure of the coating layer and reduces the protective effect of the coating layer on the pigment particles.

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