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Silica-encapsulated ultra-fine bismuth vanadomolybdate yellow pigment and preparation method thereof

A technology for wrapping bismuth molybdate vanadate yellow and bismuth molybdate vanadate yellow is applied in the field of inorganic pigments, which can solve the problems of inability to apply temperature resistance requirements, difficult to meet use requirements, and insufficiently dense protective films, and achieves easy control of influencing factors, Conducive to promotion and application, the effect of fine pigment particles

Active Publication Date: 2019-05-03
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods require wet grinding and suction filtration to achieve the corresponding particle size. Not only is the process cumbersome, but the particle size of the obtained pigment particles is still relatively large, which is difficult to meet higher application requirements.
[0005] In addition, the above-mentioned pigments in the prior art are not resistant to strong acids, and when calcined above 600°C, the pigments will darken due to sintering and lose their bright yellow color. High fields, such as engineering plastics, high temperature coatings, glass inks, ceramic pigments, etc.
Therefore, in order to improve the performance of pigments, surface modification of bismuth molybdovanadate yellow pigments has become a research and development focus. Zirconium, phosphate and various oxides, but in the prior art, the pigment particles and the inorganic protective film are only mixed and adsorbed together, and the protective film is not dense enough, so the effect is not ideal

Method used

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  • Silica-encapsulated ultra-fine bismuth vanadomolybdate yellow pigment and preparation method thereof
  • Silica-encapsulated ultra-fine bismuth vanadomolybdate yellow pigment and preparation method thereof
  • Silica-encapsulated ultra-fine bismuth vanadomolybdate yellow pigment and preparation method thereof

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Embodiment 1

[0033] The preparation method of the present embodiment a kind of superfine silicon dioxide encapsulation type bismuth molybdenum vanadate yellow pigment, its steps are as follows:

[0034] (1) Preparation of Ultrafine Bismuth Molybdovanadate Yellow Pigment Filter Cake

[0035] (1-1) 9.70g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 100 mL of nitric acid solution with a concentration of 2.0 mol / L, and after adding 0.60 g of dispersant polyvinylpyrrolidone and stirring to dissolve, liquid A was obtained;

[0036] (1-2) 9.76g ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 4H 2 O] and 1.48g sodium metavanadate (NaVO 3 ) was dissolved in 100 mL of sodium hydroxide solution with a concentration of 2.0 mol / L to obtain liquid B;

[0037] (1-3) Mix the above liquid A and liquid B at room temperature, adjust the pH value of the system to 6.0 with sodium hydroxide solution, and react for 2.0 h under the conditions of stirring and water bath temperature of 70 °C. After suction filtration, fir...

Embodiment 2

[0043] The preparation method of the present embodiment a kind of superfine silicon dioxide encapsulation type bismuth molybdenum vanadate yellow pigment, its steps are as follows:

[0044] (1) Preparation of Ultrafine Bismuth Molybdovanadate Yellow Pigment Filter Cake

[0045] (1-1) 7.30g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 100 mL of nitric acid solution with a concentration of 1.5 mol / L, and after adding 0.45 g of dispersant polyvinyl alcohol and stirring to dissolve, liquid A was obtained;

[0046] (1-2) 10.0g disodium molybdate (Na 2 MoO 4 2H 2 O) and 1.06g ammonium metavanadate (NH 4 VO 3 ) was dissolved in 100 mL of sodium hydroxide solution with a concentration of 1.5 mol / L to obtain liquid B;

[0047] (1-3) Mix the above liquid A and liquid B at room temperature, adjust the pH value of the system to 6.5 with sodium hydroxide solution, and react for 2.0 h under the conditions of stirring and water bath temperature of 70 ° C, after suction filtration, first use ...

Embodiment 3

[0053] The preparation method of a kind of superfine silicon dioxide encapsulation type bismuth molybdenum vanadate yellow pigment of this embodiment, differs from embodiment one in that:

[0054] In the step (1-2), the source of vanadium is ammonium metavanadate (NH 4 VO 3 ), the dosage is 1.42g;

[0055] The temperature of the water bath in the step (1-3) is 65°C;

[0056] In step (2-1), the consumption of tetraethyl orthosilicate is 12.4 g, the consumption of concentrated ammonia water is 10.5 mL, and the consumption of distilled water is 210 mL.

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Abstract

The present invention discloses a silica-encapsulated ultra-fine bismuth vanadomolybdate yellow pigment which is composed of a transparent SiO2 shell encapsulating layer and powder particles of a bismuth vanadomolybdate yellow pigment encapsulated therein. In addition, a preparation method of the silica-encapsulated ultra-fine bismuth vanadomolybdate yellow pigment is also disclosed. The silica-encapsulated ultra-fine bismuth vanadomolybdate yellow pigment disclosed by the present invention, with silica as a transparent encapsulating shell to encapsulate the ultra-fine bismuth vanadomolybdateyellow pigment, has significant improvements in high temperature resistance and acid resistance and can meet higher use requirements. According to the present invention, the ultra-fine bismuth vanadomolybdate particles prepared by a wet-chemical process under a liquid phase condition are encapsulated with silica after being dried and calcined, thus avoiding agglomeration and caking of the pigmentpowder and resulting in a fine and uniform particle size and good dispersibility of the pigment particles; and with no need for expensive equipment and because of a simple easy-to-operate process andlow production cost, promotion and application are facilitated.

Description

technical field [0001] The invention relates to the technical field of inorganic pigments, in particular to an encapsulated bismuth molybdovanadate yellow pigment and a preparation method thereof. Background technique [0002] Cadmium yellow (CdS) and chrome yellow (PbCrO 4 , BaCrO 4 ), has the advantages of bright color, strong hiding power, and low price. It is an inorganic yellow pigment commonly used in the market today, and has a long history of application and a wide range of applications. However, since the toxic metal elements of cadmium, lead and chromium (VI) will seriously endanger human health and pollute the environment, it is not only imperative but also of great significance to develop new environmentally friendly yellow pigments to replace them. [0003] Bismuth molybdate vanadate (general formula BiVO 4 · nBi 2 MoO 6 , 0.2≤n≤2) is a new type of environmentally friendly and non-toxic advanced inorganic yellow pigment. Its hue can be adjusted by the value...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09C3/06C09C3/04
Inventor 王竹梅沈宗洋左建林李月明孙熠
Owner JINGDEZHEN CERAMIC INSTITUTE
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