Method of coating glass hollow microsphere surface with spinel type ferrite shell, obtained hollow composite microsphere and application thereof
A glass hollow microsphere and surface coating technology, which is applied in the preparation of microspheres and microcapsule preparations, can solve the problems of low efficiency, large amounts of waste liquid, unfavorable energy conservation and environmental protection, etc., and achieve the effect of high efficiency and short reaction time
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Embodiment 1
[0039] (M x N 1-x O) y · Fe 2 o 3 (x=1, y=1, M is Ni), namely NiFe 2 o 4 Coating of ferrite on the surface of glass hollow microspheres.
[0040] In the first step, ferric nitrate nonahydrate, nickel nitrate hexahydrate, and sucrose are mixed in a molar ratio of 2:1:3 and dissolved in deionized water to obtain 1000 grams of precursor solution A. The amount of water is to ensure the content of precursor A. The amount of water is 50% as the standard.
[0041] In the second step, the density is 0.3g / cm 3 The glass hollow microspheres and precursor solution A were mixed according to the weight ratio of 1:2, and fully stirred to obtain the precursor B.
[0042] In the third step, the newly prepared wet precursor B is directly placed in a high-temperature air environment at 400°C for water evaporation and ignition. The ignited precursor can be taken out and placed at room temperature until the combustion is complete to obtain the product; or ignited Then continue to stay i...
Embodiment 2
[0044] (M x N 1-x O) y · Fe 2 o 3 (x=1, y=1, M is Co), namely CoFe 2 o 4 Coating of ferrite on the surface of glass hollow microspheres.
[0045] In the first step, ferric nitrate nonahydrate, cobalt nitrate hexahydrate, and sucrose were mixed in a molar ratio of 2:1:3 and dissolved in deionized water to obtain 1000 grams of precursor solution A. The amount of water needed to ensure that each component was dissolved The water content of precursor A was 45%.
[0046] In the second step, the density is 0.3g / cm 3 The glass hollow microspheres and precursor solution A were mixed according to the weight ratio of 1:1.5, and fully stirred to obtain the precursor B.
[0047] In the third step, the newly prepared wet precursor B is directly placed in a high-temperature air environment at 600°C for water evaporation and ignition. The ignited precursor can be taken out and placed at room temperature until the combustion is complete to obtain the product; or ignited Then continu...
Embodiment 3
[0049] (M x N 1-x O) y · Fe 2 o 3 (x=1, y=1, M is Ni), namely NiFe 2 o 4 The second round of coating of ferrite on the surface of glass hollow microspheres.
[0050] In the first step, the preparation of precursor solution A is the same as the first step in Example 1.
[0051] In the second step, the glass hollow microspheres / NiFe obtained in Example 1 2 o 4 The hollow composite microspheres were mixed with the precursor solution A at a weight ratio of 1:1, and fully stirred to obtain the precursor B.
[0052] In the third step, the newly prepared wet precursor B is directly placed in a high-temperature air environment at 400°C for water evaporation and ignition. The ignited precursor can be taken out and placed at room temperature until the combustion is complete to obtain the product; or ignited Then continue to stay in the above-mentioned high-temperature environment for 5 minutes and then take it out to obtain the product glass hollow microspheres / NiFe 2 o 4 Ho...
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