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Holmium molybdate pigment as well as preparation method and application thereof

A technology of coloring material and molybdic acid, which is applied in the field of holmium molybdate coloring material and its preparation, can solve the problems that limit the large-scale popularization and application of holmium molybdate coloring material, high calcination temperature, long reaction time, etc., and achieve low production cost, disperse Good stability and single crystal structure

Inactive Publication Date: 2022-03-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Holmium molybdate pigment is a new type of inorganic pigment. When it is irradiated by light sources of different wavelengths, it can show different colors, has a color changing effect, and has a broad application prospect. However, the existing holmium molybdate prepared by solid-phase method Pigments generally have problems such as easy generation of impurity phases, large particles, long reaction time, high calcination temperature, high energy consumption, and poor optical properties due to easy oxidation during the reaction process, which seriously limits the large-scale popularization and application of holmium molybdate pigments.

Method used

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  • Holmium molybdate pigment as well as preparation method and application thereof
  • Holmium molybdate pigment as well as preparation method and application thereof
  • Holmium molybdate pigment as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A kind of holmium molybdate pigment, its preparation method comprises the following steps:

[0038] 1) Add 0.0196mol of holmium nitrate to 100mL of nitric acid with a concentration of 4mol / L, stir evenly to obtain a holmium-containing solution, and add 0.0014mol of ammonium heptamolybdate to 100mL of deionized water, stir evenly to obtain a molybdenum-containing solution ;

[0039] 2) slowly and uniformly adding the holmium-containing solution to the molybdenum-containing solution to obtain a blended solution;

[0040] 3) Add ammonia water dropwise into the blended solution until the pH of the blended solution is 7.5, then let it stand for aging for 3 hours, centrifuge, wash the solid precipitates obtained by centrifugation with deionized water and absolute ethanol respectively 3 times each, to obtain Precipitate;

[0041] 4) Put the precipitate in a blast drying oven, dry it at 80°C for 18 hours, then place it in a muffle furnace, and keep it warm at 1000°C for 3 hou...

Embodiment 2

[0048] A kind of holmium molybdate pigment, its preparation method comprises the following steps:

[0049] 1) Add 0.0196mol of holmium nitrate to 150mL of nitric acid with a concentration of 3mol / L, stir evenly to obtain a holmium-containing solution, and add 0.0026mol of ammonium tetramolybdate to 200mL of deionized water, stir evenly to obtain a molybdenum-containing solution ;

[0050] 2) slowly and uniformly adding the holmium-containing solution to the molybdenum-containing solution to obtain a blended solution;

[0051] 3) Add ammonia water dropwise to the blended solution until the pH of the blended solution is 7.0, then let it stand and age for 2 hours, centrifuge, wash and centrifuge the solid precipitate obtained by deionized water and absolute ethanol three times respectively, to obtain Precipitate;

[0052] 4) Put the precipitate in a blast drying oven, dry it at 60°C for 24 hours, then place it in a muffle furnace, and keep it at 1100°C for 2 hours to obtain the...

Embodiment 3

[0057] A kind of holmium molybdate pigment, its preparation method comprises the following steps:

[0058] 1) Add 0.02mol of holmium chloride to 200mL of hydrochloric acid with a concentration of 2mol / L, stir well to obtain a solution containing holmium, and add 0.0016mol of ammonium heptamolybdate to 75mL of deionized water, stir well to obtain a solution containing molybdenum solution;

[0059] 2) slowly and uniformly adding the holmium-containing solution to the molybdenum-containing solution to obtain a blended solution;

[0060] 3) Add ammonia water dropwise to the blended solution until the pH of the blended solution is 8.0, then let it stand for aging for 4 hours, centrifuge, and wash the solid precipitates obtained by centrifugation with deionized water and absolute ethanol for 3 times respectively, to obtain Precipitate;

[0061] 4) Put the precipitate in a blast drying oven, dry it at 70°C for 20 hours, then place it in a muffle furnace, and keep it warm at 1200°C fo...

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Abstract

The invention discloses a holmium molybdate pigment as well as a preparation method and application thereof. The preparation method of the holmium molybdate pigment comprises the following steps: preparing a blending solution from a holmium-containing compound and a molybdenum-containing compound, adding a precipitator for coprecipitation, and calcining the obtained precipitate to obtain the holmium molybdate pigment. The holmium molybdate pigment is single in crystal structure, uniform in granularity, less in agglomeration, good in color changing effect under different light source conditions, stable in color development, simple in preparation process, low in equipment requirement, low in production cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of inorganic pigments, in particular to a holmium molybdate pigment and its preparation method and application. Background technique [0002] The special electronic configuration of rare earth ions makes them have unique optical properties, and their emission and excitation mainly come from electronic transitions between 4f energy levels or between 5d-4f energy levels. The transition of rare earth ions from low energy level to high energy level is a process of absorbing photons, and energy is absorbed during the process of absorbing photons, while the transition of rare earth ions from high energy level to low energy level is a process of releasing photons. emit light of different wavenumbers. The transition between 4f energy levels forms a line spectrum, mainly in the visible and infrared spectral regions, while the transition between 5d-4f energy levels forms a band spectrum, mainly in the ultraviolet spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
CPCC01G39/00C01P2002/72C01P2004/03C01P2004/62
Inventor 王燕民李向钰潘志东
Owner SOUTH CHINA UNIV OF TECH
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