Preparation method of nearly spherical mullite coated particles
A mullite, near-spherical technology, applied in chemical instruments and methods, inorganic pigment treatment, dyed organosilicon compound treatment, etc. Effect
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[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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