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Preparation method of nano alumina sol and gel

A nano-alumina sol technology, applied in the chemical industry, can solve problems such as unsatisfactory solid content of nano-alumina sol, and achieve the effects of small particle size, reduced agglomeration, and improved solubility

Active Publication Date: 2014-01-08
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the methods reported in the literature and patents, the solid content of the prepared nano-alumina sol is not ideal

Method used

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  • Preparation method of nano alumina sol and gel
  • Preparation method of nano alumina sol and gel
  • Preparation method of nano alumina sol and gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation process such as figure 1 as shown,

[0042] (1) Preparation of nano-alumina suspension

[0043] Introduce 3.5kg of alumina nanoparticles into 6.5kg of deionized water by high-speed stirring to obtain a mixed solution of nano-alumina, add 0.2% of the mass of alumina nanoparticles to the mixed solution of lactic acid and an appropriate amount of additives, stir A nano-alumina suspension with a particle content of 35% was prepared in 5 hours.

[0044] (2) Pulverize and disperse to obtain nano-alumina sol

[0045] Add 3.5 kg of agate balls to the nano-alumina suspension with a solid content of 35% according to the ball-to-material ratio of 1:1. The particle size of the balls is 5 mm, and the balls are further pulverized and dispersed by a planetary ball mill at a speed of 250 rpm. Under the condition of ball milling for 24 hours, the nano-alumina sol with a solid content of 35% was prepared.

[0046] Scanning electron microscope S-4800 (Hitachi Co., Japan) w...

Embodiment 2～8

[0048] 0.5%, 0.7%, 1.0%, 2.0%, 3.0%, 4.0% and 5.0% of the mass of alumina nanoparticles were added to the mixed liquid of lactic acid and an appropriate amount of auxiliary agents, and the rest were the same as in Example 1.

[0049] The particle size results of the nano-alumina dispersion were measured by the Malvern laser particle size analyzer Zetasizer Nano ZS, and the test results are shown in Table 1 and Figure 4 .

[0050] Table I

[0051] specific embodiment

[0052] It can be seen from Table 1 that under the same conditions, the particle size of nano-alumina gradually decreases when the amount of lactic acid dispersant is increased. At 2.0-3.0%, the particle size reaches the trough, and then the particle size begins to increase.

Embodiment 9～13

[0054] 4.0kg of nano-alumina particles were introduced into 6.0kg of deionized water by high-speed stirring, 2.0% lactic acid dispersant was added, and stirred for 5 hours to obtain a nano-alumina suspension with a particle content of 40%; the above-mentioned particle content was 40% 4.0kg of agate balls were added to the nano-alumina suspension at a ball-to-material ratio of 1:1. The particle size of the balls was 5 mm, which was further pulverized and dispersed by a planetary ball mill. 10, 20, 40, 60 hours to prepare nano-alumina sol with a content of 40%. The particle size of the nano-alumina dispersion is shown in Table 2 and Figure 5 .

[0055] Table II

[0056] specific embodiment

[0057] from table two and Figure 4 It can be seen that under the same conditions, the longer the ball milling time, the smaller the particle size of nano-alumina in the sol.

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Abstract

The invention provides a preparation method of nano alumina sol and gel, nano alumina particles are used as a raw material, lactic acid is used as a dispersing agent, and the high-solid-content nano alumina sol is obtained by combination of high speed stirring and dispersion by using a high-energy ball mill; under stirring, the prepared nano alumina sol is added with a certain amount of a hexamethylenetetramine water solution, and the nano alumina gel is obtained by heating for a certain time for gelatinization. The preparation method is simple and easy, the solid content of the nano alumina sol prepared by dispersing is equal to or more than 30%, and the nano alumina sol is small in particle size and uniform in distribution, and can stably exist for a long time in water.

Description

technical field [0001] The invention relates to a preparation method of nano-alumina sol and gel, which belongs to the technical field of chemical industry. Background technique [0002] Nano-alumina sol has excellent physical and chemical properties, and is widely used in production and life. It is used to make catalysts and carriers, fine ceramics, fiber-reinforced alumina ceramic composite materials, and new coatings. However, due to the small particle size of nano-alumina, the specific surface area and surface energy are large, it is easy to agglomerate, and it is difficult to increase the solid content. There are very few research reports on nano-alumina sol and gel with high solid content at home and abroad. According to relevant research, the main reason is that the solubility of alumina in water is very limited. [0003] At present, some domestic and foreign patents on nano-alumina sol are mostly related to the preparation technology of nano-alumina sol. In the pre...

Claims

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Application Information

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IPC IPC(8): C01F7/02B82Y30/00
Inventor 张辉杨小波吕毅余悠然张天翔赵英民裴雨辰武建强
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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