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Preparation method for alumina hollow spheres

A technology for alumina hollow spheres and alumina powder, which is applied in the field of preparation of alumina hollow spheres, can solve the problems of complex process, poor practicability, easy collapse and broken, etc., and achieve simple preparation equipment and process, good product performance, The effect of sintering temperature control

Inactive Publication Date: 2013-09-04
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hollow microspheres prepared by hydrothermal method, spray pyrolysis method, ultrasonic method and other methods have small particle size and are easy to collapse and break.
[0004] At present, the alumina ceramic balls produced in the market are generally blown into balls by melting method. The high temperature required for melting leads to high energy consumption, complicated process and high cost. The product particle size of alumina hollow balls is small and extremely Fragile and less practical

Method used

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  • Preparation method for alumina hollow spheres
  • Preparation method for alumina hollow spheres
  • Preparation method for alumina hollow spheres

Examples

Experimental program
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Embodiment 1

[0024] A preparation method of aluminum oxide hollow spheres, comprising the following steps:

[0025] A, batching: by chitosan: water is the mass ratio of 0.5:100, acetic acid: water is the mass ratio of 0.5:100, get chitosan, water and acetic acid and mix and be mixed with chitosan-acetic acid-water solution; Styrene balls: chitosan-acetic acid-water solution is a mass ratio of 8:1, and polystyrene balls: α-alumina powder is a mass ratio of 1:5, and polystyrene (which can be cheap polystyrene) Styrene) balls, chitosan-acetic acid-water solution and α-alumina powder;

[0026] b. Preparation of core-shell spheres: mix and stir polystyrene spheres with chitosan-acetic acid-water solution, so that the surface of polystyrene spheres is evenly coated with a layer of chitosan-acetic acid-water solution; Put the polystyrene balls of sugar-acetic acid-water solution and α-alumina powder into a ball mill (it can be a ball mill, a ball mill tank, etc.), and rotate and coat at a speed ...

Embodiment 2

[0030] A preparation method of aluminum oxide hollow spheres, comprising the following steps:

[0031] a. Ingredients: According to the mass ratio of chitosan: water 0.5:100~5:100, acetic acid: water 0.5:100~5:100 mass ratio, chitosan, water and acetic acid are mixed to prepare chitosan Sugar-acetic acid-water solution; according to the mass ratio of polystyrene ball: chitosan-acetic acid-water solution is 5:1~10:1, according to polystyrene ball: α-alumina powder is 1:5~1: The mass ratio of 15, get polystyrene ball, chitosan-acetic acid-water solution and α-alumina powder;

[0032] b. Preparation of core-shell spheres: mix and stir polystyrene spheres with chitosan-acetic acid-water solution, so that the surface of polystyrene spheres is evenly coated with a layer of chitosan-acetic acid-water solution; Put the polystyrene balls of sugar-acetic acid-water solution and α-alumina powder into a ball mill (it can be a ball mill, a ball mill tank, etc.), and rotate and coat at a s...

Embodiment 3

[0035] A preparation method of aluminum oxide hollow spheres, comprising the following steps:

[0036] A, batching: by chitosan: water is the mass ratio of 5:100, acetic acid: water is the mass ratio of 5:100, get chitosan, water and acetic acid and mix and be mixed with chitosan-acetic acid-water solution; Styrene ball: chitosan-acetic acid-water solution is a mass ratio of 10:1, according to the mass ratio of polystyrene ball: α-alumina powder is 1:15, take polystyrene ball, chitosan-acetic acid - aqueous solution and α-alumina powder;

[0037]b. Preparation of core-shell spheres: mix and stir polystyrene spheres with chitosan-acetic acid-water solution, so that the surface of polystyrene spheres is evenly coated with a layer of chitosan-acetic acid-water solution; Put the polystyrene balls of sugar-acetic acid-water solution and α-alumina powder into a ball milling device (which can be a ball mill, a ball milling tank, etc.), and rotate at a speed of 30r / s (rev / sec) for 2h...

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Abstract

The invention discloses a preparation method for alumina hollow spheres. The preparation method comprises the steps of preparing a chitosan-acetic acid-water solution; weighing raw materials according to a mass ratio of polystyrene spheres to the chitosan-acetic acid-water solution 5:1 to 10:1 and a mass ratio of the polystyrene spheres to alpha-alumina powder of 1:5 to 1:15; mixing and stirring the polystyrene spheres and the chitosan-acetic acid-water solution to make the surfaces of the polystyrene spheres uniformly coated by a layer of the chitosan-acetic acid-water solution; putting the polystyrene spheres coated by the chitosan-acetic acid-water solution and the alpha-alumina powder in a ball-milling device, rotating at a rotation speed of 5-30 r / s to coat for 2-24 h so as to prepare core-shell spheres; and sintering the core-shell spheres to obtain the alumina hollow spheres with the diameter of 0.2-2 mm and wall thickness of 20-100 [mu]m. The preparation method is low in cost of the raw materials, simple in process and safe and simple in operations, and can realize industrial production easily.

Description

technical field [0001] The invention belongs to the preparation of aluminum oxide, and relates to a preparation method of aluminum oxide hollow spheres. The aluminum oxide hollow sphere prepared by the invention can be applied to light materials, catalysts, high-temperature-resistant heat-insulating bricks and other fields. Background technique [0002] In recent years, hollow microspheres have become a new type of material. Due to their special properties and applications, hollow microspheres of micron or millimeter scale have begun to attract everyone's attention. With a large internal space and extremely thin wall thickness, it has light weight, high specific surface area, high temperature resistance and corrosion resistance, and the hollow part can accommodate a large number of guest molecules or large-sized guests, making the hollow microsphere structure The application range of materials is constantly expanding, and they play an important role in many technical field...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/636
Inventor 廖其龙曾燕
Owner SOUTHWEAT UNIV OF SCI & TECH
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