A kind of preparation method of near-spherical mullite-coated particles

A mullite and near-spherical technology, applied in chemical instruments and methods, fibrous fillers, dyed organosilicon compound treatment, etc., can solve problems that have not been seen before, achieve good thermal stability, simple synthesis process, and environmental friendliness Effect

Active Publication Date: 2021-08-03
GUANGDONG DOWSTONE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no relevant report in the prior art

Method used

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  • A kind of preparation method of near-spherical mullite-coated particles
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  • A kind of preparation method of near-spherical mullite-coated particles

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preparation example Construction

[0042] A preparation method for nearly spherical mullite-coated particles, comprising:

[0043] S1) dispersing the particles to be wrapped in the solution to obtain a dispersion;

[0044] S2) Amorphous package, including:

[0045] S2-a) Add a silicon source to the dispersion, stir to hydrolyze the silicon source and form amorphous SiO on the surface of the particles to be coated 2 ·xH 2 O cladding layer;

[0046] S2-b) Further add an aluminum source to the dispersion, stir to hydrolyze the aluminum source and form amorphous Al on the surface of the particle to be wrapped 2 o 3 ·xH 2 O cladding; or

[0047] S2-1) Add an aluminum source to the dispersion, stir to hydrolyze the aluminum source and form amorphous Al on the surface of the particle to be wrapped 2 o 3 ·xH 2 O cladding layer;

[0048] S2-2) Further add a silicon source to the dispersion, stir to hydrolyze the silicon source and form amorphous SiO on the surface of the particles to be wrapped 2 ·xH 2 O cla...

Embodiment 1

[0066] Embodiment 1: Preparation of mullite-coated cadmium sulfoselenide pigment

[0067] 1) Disperse cadmium sulfur selenide toner with a particle size of 80-10 nanometers in a mixed solution of ethanol and water, adjust the pH to 9 with ammonia water, stir magnetically at room temperature, and take ethyl orthosilicate at 0.5ml / min Drop into the mixed solution, and continue to stir for 2h after the drop to form amorphous SiO 2 .xH 2 O-coated cadmium sulfoselenide, wherein the volume ratio of ethyl orthosilicate, ethanol and water is 1:10:3, and the molar ratio of Cd:Si is 1:3;

[0068] 2) Dissolve aluminum isopropoxide in water to prepare a solution with a concentration of 0.3mol / L, drop it into the solution in step 2 at 0.5ml / min, and continue stirring for 2 hours after dropping to form amorphous Al 2 o 3 .xH 2 O cladding layer, add mineralizer lithium fluoride and stir for 1h to obtain mixed slurry, wherein Si:Al:F molar ratio is 1:3:0.006;

[0069] 3) Take samarium ni...

Embodiment 2

[0072] Embodiment 2: Preparation of mullite-coated cadmium sulfoselenide pigment

[0073] 1) Disperse cadmium sulfur selenide toner with a particle size of 10-60 nanometers in a mixed solution of ethanol and water, adjust the pH to 8.5 with ammonia water, stir magnetically at room temperature, and take ethyl orthosilicate at 0.2ml / min Drop into the mixed solution, and continue to stir for 4h after the drop to form amorphous SiO 2 .xH 2 O-coated cadmium sulfoselenide, wherein the volume ratio of ethyl orthosilicate, ethanol and water is 1:10:1, and the molar ratio of Cd:Si is 1:4;

[0074] 2) Dissolve aluminum isopropoxide in water to prepare a solution with a concentration of 0.1mol / L, drop it into the solution in step 2 at 0.2ml / min, and continue stirring for 4 hours after dropping to form amorphous Al 2 o 3 .xH 2 O coating layer, add mineralizer lithium fluoride and stir for 2h to obtain mixed slurry, wherein Si:Al:F molar ratio is 1:3:0.008;

[0075] 3) Take lanthanum ...

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Abstract

The invention discloses a preparation method of nearly spherical mullite-coated particles. The inventors have found that by adding rare earth elements, the directional growth of mullite crystal grains is inhibited and the mullite crystal grains appear rod-shaped, and the near-spherical mullite-coated particles are prepared for the first time.

Description

technical field [0001] The invention relates to a method for preparing a wrapped material, in particular to a method for preparing near-spherical 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, Alumi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/12C09C1/24C09C1/56C09C3/04C09C3/06C09C3/12
CPCC09C1/0009C09C1/12C09C1/24C09C1/56C09C3/006C09C3/043C09C3/063C09C3/12
Inventor 张翼程科恺秦伍
Owner GUANGDONG DOWSTONE TECH
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