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A preparation method for controlling the size and thickness of flake aluminum oxide

A technology of flaky alumina and alumina, which is applied in the preparation of alumina/hydroxide, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve the problems of high maintenance cost, easy corrosion and loss of mechanical equipment, etc. , to achieve the effect of low production cost, small particle size range span and good particle size uniformity

Active Publication Date: 2020-11-24
福州琪宁精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter-thickness ratio of the product prepared by this method can reach 60, but hydrofluoric acid is added in the process. During industrial production, it is easy to corrode and wear mechanical equipment, and the maintenance cost is high.
[0007] At present, there is no method for preparing flaky alumina with good particle size uniformity, relatively large diameter and thickness, simple production process, economy, environmental protection, and easy industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Mix 90 parts of aluminum hydroxide with 350 parts of water to adjust pH=3, then add a mixture of 0.06 parts of polyethylene glycol and 0.04 parts of glycerin and mix to obtain mixture A;

[0051] (2) a mixture of 5 parts of potassium sulfate and 25 parts of sodium sulfate is mixed with 150 parts of water to obtain mixture B;

[0052] (3) Add mixture B to mixture A at a constant speed within 50 minutes, and stir while adding, the stirring method starts from 300r / min, drops at a speed of 5r / min, and stands still for 1h to obtain mixture C;

[0053] (4) Add 4.5 parts of magnesium sulfate solution to the mixture C in a uniform manner within 30 minutes. The mixing temperature is 40°C. Stir while adding. The stirring method starts from 0r / min and increases at a speed of 5r / min. , stirring until the magnesium sulfate solution is completely added to the mixture C to obtain a solid D;

[0054] (5) Dry and calcinate the solid D and wash it with water to obtain alumina. The c...

Embodiment 2

[0056] (1) Mix 110 parts of aluminum sulfate with 550 parts of water, adjust pH=0.5, then add a mixture of 12.5 parts of polyethylene glycol and 2.5 parts of glycerin to obtain mixture A;

[0057] (2) The mixture of 10 parts of potassium chloride and 30 parts of sodium chloride is mixed with 400 parts of water to obtain mixture B;

[0058] (3) Add mixture B to mixture A at a constant speed within 60 minutes, and stir while adding. The stirring method starts from 300r / min, drops at a speed of 5r / min, and stands still for 1.5h to obtain mixture C;

[0059] (4) Add 1.1 parts of magnesium sulfate solution to the mixture C in a uniform manner within 40 minutes. The mixing temperature is 50 ° C. Stir while adding. The stirring method starts from 0 r / min and increases at a speed of 5 r / min. , stirring until the magnesium sulfate solution is completely added to the mixture C to obtain a solid D;

[0060] (5) Dry and calcinate the solid D and wash it with water to obtain alumina. The ...

Embodiment 3

[0062] (1) Mix 100 parts of aluminum chloride with 100 parts of water, adjust pH=1, then add a mixture of 3 parts of polyethylene glycol and 1 part of glycerin to obtain mixture A;

[0063] (2) The mixture of 7 parts of potassium sulfate and 28 parts of sodium sulfate is mixed with 280 parts of water to obtain mixture B;

[0064] (3) Add mixture B to mixture A at a constant speed within 55 minutes, and stir while adding. The stirring method starts from 300r / min, drops at a speed of 5r / min, and stands still for 1.2h to obtain mixture C;

[0065] (4) Add 10 parts of magnesium sulfate solution to mixture C in a uniform manner within 30 minutes, the mixing temperature is 45°C, and stir while adding, the stirring method starts from 0r / min and increases at a speed of 5r / min , stirring until the magnesium sulfate solution is completely added to the mixture C to obtain a solid D;

[0066] (5) The solid D was dried, calcined and washed with water to obtain alumina. The calcining condi...

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Abstract

The invention relates to the technical field of ceramic powder material preparation, in particular to a preparation method for controlling the size and thickness of flake alumina. The preparation method comprises the following steps of (1) mixing an aluminium source with water, adjusting pH, and adding and mixing a surfactant to obtain a mixture A; (2) mixing molten salt with the water to obtain amixture B; (3) adding the mixture B to the mixture A, stirring while adding, and standing to obtain a mixture C; (4) adding a magnesium sulfate solution to the mixture C, stirring while adding to obtain a solid body D; and (5) drying, calcining and watering the solid body D to obtain the alumina. According to the preparation method, through reasonable design and controlling of the reaction process, an obtained product has uniform particle size and relatively large diameter thickness, and can be better applied to the pearl pigment field and other fields; and heat resistance and mechanical strength of the product are good.

Description

technical field [0001] The invention relates to the technical field of preparation of ceramic powder materials, in particular to a preparation method for controlling the size and thickness of flaky alumina. Background technique [0002] As a special alumina and an important powder material, flaky alumina not only has the excellent properties of ordinary alumina, such as high hardness, high melting point, anti-alumina, high temperature resistance, corrosion resistance, high thermal conductivity, and high resistivity, but also It also has special properties such as a special two-dimensional sheet structure, moderate surface activity, good adhesion, ability to reflect light, and significant shielding effect. Flaky alumina has been widely used in pigments, automotive paints, toughened ceramics and other fields, especially in pearlescent pigments. Pearlescent pigments are composed of thin layers of several metal oxides coated with mica. Different pearlescent effects can be prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/44C01F7/32C01F7/30C01F7/02C09C1/00
CPCC01F7/30C01F7/32C01F7/442C01P2004/03C01P2004/61C01P2004/62C09C1/0015
Inventor 郑德浩
Owner 福州琪宁精细化工有限公司
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