A kind of preparation method of hollow aluminum oxide microsphere

Abstract

The invention discloses a preparation method of hollow type alumina microspheres. The method comprises the steps that step 1, polyvinyl alcohol is added into deionized water, ultrasonically stirred until completely dissolved to obtain dispersed alcohol liquid; step 2, polylactic acid powder and a curing agent are added into a dispersed solution to conduct microwave reaction for 30 to 60 minutes, and then the mixture is added to a mold to rapidly reduce the temperature to obtain macromolecule spherical particles; step 3, ammonium aluminum carbonate hydroxide and polyvinylpyrrolidone are added into absolute ethanol to be stirred uniformly, and then uniformly coated on the surfaces of the macromolecule spherical particles, and inorganic-organic spherical particles are obtained; step 4, the inorganic-organic spherical particles are placed in a reaction kettle and heated and pressurized for 3 to 5 hours to obtain solidified spherical particles; step 5, the solidified spherical particles areplaced in a methanol reaction solution, micro-current electrolysis is carried out for 3 to 5 hours, after the reaction is completed, the solidified spherical particles are taken out for washing and drying to obtain the hollow type alumina microspheres. The preparation method of the hollow type alumina microspheres solves a problem that the preparation of inorganic hollow spheres is difficult, thepreparation method is simple and rapid, the structure is stable, and a large specific surface area is provided.

Description

technical field

[0001] The invention belongs to the field of functional ceramics, and in particular relates to a method for preparing hollow alumina microspheres. Background technique

[0002] Compared with bulk materials, nanomaterials (especially hollow structures) have the characteristics of low density, high specific surface area, good stability, strong surface permeability and special optical properties, so they have become one of the attractive directions in the field of material research. one. The alumina hollow structure has a hollow structure with a large specific surface area, which can adsorb and fill particles, and its chemical stability is high, especially when its size is reduced to the nanometer scale, because of its large specific surface area and pore size, activity High, can significantly improve catalytic efficiency, as a packaged very small reactor, widely used in catalytic cracking of heavy oil macromolecules, heterogeneous catalysis, new chemical react...

Examples

Embodiment 1

[0029] A preparation method of hollow alumina microspheres, the preparation method is as follows:

[0030] Step 1, adding polyvinyl alcohol into deionized water, ultrasonically stirring until completely dissolved, to obtain a dispersed alcohol liquid;

[0031] Step 2: Add polylactic acid powder and curing agent to the dispersing alcohol liquid for microwave reaction for 30 minutes, then add it to the mold, and quickly cool down to obtain spherical polymer particles;

[0032] Step 3, adding ammonium aluminum carbonate and polyvinylpyrrolidone into absolute ethanol and stirring evenly, and then evenly coating the surface of the polymer spherical particles to obtain inorganic-organic spherical particles;

[0033] Step 4, putting the inorganic-organic spherical particles into the reaction kettle and heating and pressing for 3 hours to obtain solidified spherical particles;

[0034] Step 5, put the solidified spherical particles into the methanol reaction liquid, and react with mi...

Embodiment 2

[0044] A preparation method of hollow alumina microspheres, the preparation method is as follows:

[0045] Step 1, adding polyvinyl alcohol into deionized water, ultrasonically stirring until completely dissolved, to obtain a dispersed alcohol liquid;

[0046] Step 2, adding polylactic acid powder and curing agent to the dispersing alcohol solution for microwave reaction for 60 minutes, then adding it to the mold, cooling down rapidly to obtain spherical polymer particles;

[0047] Step 3, adding ammonium aluminum carbonate and polyvinylpyrrolidone into absolute ethanol and stirring evenly, and then evenly coating the surface of the polymer spherical particles to obtain inorganic-organic spherical particles;

[0048] Step 4, putting the inorganic-organic spherical particles into the reaction kettle and heating and pressing for 5 hours to obtain solidified spherical particles;

[0049] Step 5, put the solidified spherical particles into the methanol reaction liquid, and conduc...

Embodiment 3

[0059] A preparation method of hollow alumina microspheres, the preparation method is as follows:

[0060] Step 1, adding polyvinyl alcohol into deionized water, ultrasonically stirring until completely dissolved, to obtain a dispersed alcohol solution;

[0061] Step 2, adding polylactic acid powder and curing agent to the dispersing alcohol liquid for microwave reaction for 45 minutes, then adding it to the mold, cooling down rapidly to obtain spherical polymer particles;

[0062] Step 3, adding ammonium aluminum carbonate and polyvinylpyrrolidone into absolute ethanol and stirring evenly, and then evenly coating the surface of the polymer spherical particles to obtain inorganic-organic spherical particles;

[0063] Step 4, putting the inorganic-organic spherical particles into the reaction kettle and heating and pressing for 4 hours to obtain solidified spherical particles;

[0064] Step 5, put the solidified spherical particles into the methanol reaction liquid, and react ...

technical field

[0001] The invention belongs to the field of functional ceramics, and in particular relates to a method for preparing hollow alumina microspheres. Background technique

[0002] Compared with bulk materials, nanomaterials (especially hollow structures) have the characteristics of low density, high specific surface area, good stability, strong surface permeability and special optical properties, so they have become one of the attractive directions in the field of material research. one. The alumina hollow structure has a hollow structure with a large specific surface area, which can adsorb and fill particles, and its chemical stability is high, especially when its size is reduced to the nanometer scale, because of its large specific surface area and pore size, activity High, can significantly improve catalytic efficiency, as a packaged very small reactor, widely used in catalytic cracking of heavy oil macromolecules, heterogeneous catalysis, new chemical react...

Examples

Embodiment 1

[0029] A preparation method of hollow alumina microspheres, the preparation method is as follows:

[0030] Step 1, adding polyvinyl alcohol into deionized water, ultrasonically stirring until completely dissolved, to obtain a dispersed alcohol liquid;

[0031] Step 2: Add polylactic acid powder and curing agent to the dispersing alcohol liquid for microwave reaction for 30 minutes, then add it to the mold, and quickly cool down to obtain spherical polymer particles;

[0032] Step 3, adding ammonium aluminum carbonate and polyvinylpyrrolidone into absolute ethanol and stirring evenly, and then evenly coating the surface of the polymer spherical particles to obtain inorganic-organic spherical particles;

[0033] Step 4, putting the inorganic-organic spherical particles into the reaction kettle and heating and pressing for 3 hours to obtain solidified spherical particles;

[0034] Step 5, put the solidified spherical particles into the methanol reaction liquid, and react with mi...

Embodiment 2

[0044] A preparation method of hollow alumina microspheres, the preparation method is as follows:

[0045] Step 1, adding polyvinyl alcohol into deionized water, ultrasonically stirring until completely dissolved, to obtain a dispersed alcohol liquid;

[0046] Step 2, adding polylactic acid powder and curing agent to the dispersing alcohol solution for microwave reaction for 60 minutes, then adding it to the mold, cooling down rapidly to obtain spherical polymer particles;

[0047] Step 3, adding ammonium aluminum carbonate and polyvinylpyrrolidone into absolute ethanol and stirring evenly, and then evenly coating the surface of the polymer spherical particles to obtain inorganic-organic spherical particles;

[0048] Step 4, putting the inorganic-organic spherical particles into the reaction kettle and heating and pressing for 5 hours to obtain solidified spherical particles;

[0049] Step 5, put the solidified spherical particles into the methanol reaction liquid, and conduc...

Embodiment 3

[0059] A preparation method of hollow alumina microspheres, the preparation method is as follows:

[0060] Step 1, adding polyvinyl alcohol into deionized water, ultrasonically stirring until completely dissolved, to obtain a dispersed alcohol solution;

[0061] Step 2, adding polylactic acid powder and curing agent to the dispersing alcohol liquid for microwave reaction for 45 minutes, then adding it to the mold, cooling down rapidly to obtain spherical polymer particles;

[0062] Step 3, adding ammonium aluminum carbonate and polyvinylpyrrolidone into absolute ethanol and stirring evenly, and then evenly coating the surface of the polymer spherical particles to obtain inorganic-organic spherical particles;

[0063] Step 4, putting the inorganic-organic spherical particles into the reaction kettle and heating and pressing for 4 hours to obtain solidified spherical particles;

[0064] Step 5, put the solidified spherical particles into the methanol reaction liquid, and react ...