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Preparation method of two-dimensional alumina powder

A technology of alumina powder and aluminum salt, applied in the field of preparation of two-dimensional alumina powder, can solve the problems of long preparation period, rough surface, irregular shape, etc., achieve uniform and controllable thickness of powder, overcome surface roughness, diameter Thickness ratio effect

Inactive Publication Date: 2019-02-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical pulverization method is simple to operate and low in cost, the obtained powder has low purity, uneven particle size, irregular shape and rough surface, and serious particle agglomeration
The product prepared by the hydrothermal method has high purity, uniform particle size and good dispersion effect, but the preparation cycle is long and requires high temperature and high pressure

Method used

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  • Preparation method of two-dimensional alumina powder
  • Preparation method of two-dimensional alumina powder
  • Preparation method of two-dimensional alumina powder

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1. Select the molar ratio of acid to aluminum to be 0.17, and add a small amount of sodium lauryl sulfate as an additive to prepare aluminum sol. Using PET as the base, the steps for preparing two-dimensional alumina powder are as follows:

[0026] S1. Dissolve aluminum chloride hexahydrate in deionized water, and stir while adding ammonia water dropwise until the solution thickens and a white precipitate is formed;

[0027] S2. Wash and filter the white precipitate obtained in S1 to obtain a filter cake, add a certain amount of deionized water and concentrated nitric acid, stir evenly, transfer to a three-necked flask, add a small amount of sodium lauryl sulfate as an additive, and Under the conditions of temperature 90°C and stirring speed 500r / min, react for 11h to obtain a transparent aluminum sol;

[0028] S3. Soak the PET substrate in acetone for 30 minutes, rinse it with water, then place the substrate in 0.1mol / L sodium hydroxide solution, boil it in water at 80...

Embodiment 2

[0032] 2. Select the acid-aluminum molar ratio of 0.15 to prepare aluminum sol, use PET as the base, and modify the PET base with completely alcoholyzed polyvinyl alcohol PVA. The steps for preparing two-dimensional alumina powder are as follows:

[0033] S1. Dissolve aluminum chloride hexahydrate in deionized water, and stir while adding ammonia water dropwise until the solution thickens and a white precipitate is formed;

[0034] S2. Wash and filter the white precipitate obtained in S1 to obtain a filter cake, add a certain amount of deionized water and concentrated nitric acid, stir evenly, transfer to a three-necked flask, and react at a reaction temperature of 90°C and a stirring speed of 500r / min 11h obtains transparent aluminum sol;

[0035] S3. Soak the PET substrate in acetone for 30 minutes, rinse it with water, then place the substrate in 0.1mol / L sodium hydroxide solution, boil it in water at 80°C for 1 hour, rinse it with water, dry it, and then apply it with a 15...

Embodiment 3

[0039] 3. Select the acid-aluminum molar ratio of 0.15 to prepare aluminum sol, and use PI as the base to prepare two-dimensional alumina powder. The steps are as follows:

[0040] S1. Dissolve aluminum chloride hexahydrate in deionized water, and stir while adding ammonia water dropwise until the solution thickens and a white precipitate is formed;

[0041] S2. Wash and filter the white precipitate obtained in S1 to obtain a filter cake, add a certain amount of deionized water and concentrated nitric acid, stir evenly, transfer to a three-necked flask, and react at a reaction temperature of 90°C and a stirring speed of 500r / min 11h obtains transparent aluminum sol;

[0042] S3. Soak the PI substrate in acetone for 30 minutes, rinse with water, then place the substrate in 0.1mol / L sodium hydroxide solution, boil it in water at 80°C for 1 hour, rinse it with water, and dry it for later use;

[0043] S4. Evenly coat the aluminum sol obtained in S2 on the PI substrate obtained i...

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Abstract

The invention discloses a preparation method of two-dimensional alumina powder. The preparation method includes the steps of mixing aluminum salt, ammonia water and concentrated nitric acid accordingto a certain ratio, and allowing the three to react at a certain temperature to obtain transparent aluminum sol; uniformly applying the aluminum sol onto a surface-modified base by an applicator, andpeeling off a cured film after baking to obtain flaky powder; subjecting the flaky powder to high-temperature calcination to obtain the two-dimensional alumina powder. The two-dimensional alumina powder obtained by the method has the advantages of flat surface, smoothness, compactness, uniform thickness, large diameter-to-thickness ratio and the like.

Description

technical field [0001] The invention relates to a preparation method of two-dimensional alumina powder. Background technique [0002] The two-dimensional alumina powder with a flake structure has the advantages of high melting point, high hardness, corrosion resistance, good insulation performance, and high mechanical strength of ordinary alumina. Its special two-dimensional flake structure, moderate surface activity, and good adhesion And significant shielding effect, so that it can be widely used in heat dissipation materials, fillers, toughening agents, refractory materials and pearlescent pigments and other fields. [0003] At present, the main preparation methods of two-dimensional alumina powder are: molten salt method, mechanical pulverization method and hydrothermal method. The molten salt method has the advantages of simple equipment, short production cycle, high yield, low cost, controllable product shape and particle size, etc., but the powder flakes are in the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/02C01P2004/03C01P2004/20
Inventor 陈振兴张卓申玉求
Owner SUN YAT SEN UNIV
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