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Method for controllably preparing nano aluminum sol by hydrolyzing inorganic aluminum salt in one step

A nano-aluminum sol, inorganic aluminum salt technology, applied in nanotechnology, sol preparation, nanotechnology and other directions, can solve problems such as unfavorable improvement of atomic utilization rate of the system, increase of reaction cost and operation risk, and inconsistent with the concept of green chemistry. , to achieve the effect of improving atom utilization, efficient preparation and small particle size

Pending Publication Date: 2022-03-11
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Claims
  • Application Information

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Problems solved by technology

The above four methods all need to introduce a large amount of acid source, which not only increases the reaction cost and the risk of operation, but also slows down the reaction efficiency, and is not conducive to improving the atom utilization rate of the system, which does not conform to the concept of green chemistry.

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  • Method for controllably preparing nano aluminum sol by hydrolyzing inorganic aluminum salt in one step

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[0025] The method for preparing nano-aluminum sol by one-step controllable hydrolysis of inorganic aluminum salt of the present invention, the preparation method comprises the following steps:

[0026] (1) prepare lye, the concentration of lye is 0.5mol / L~1mol / L (such as 0.5, 0.8, 1.0mol / L), preferably 0.8mol / L~1.0mol / L. Prepare aluminum salt solution, aluminum salt is selected from aluminum nitrate (for example Al(NO 3 ) 3 9H 2 O), aluminum sulfate (such as Al 2 (SO 4 ) 3 ·16H 2 O) and aluminum chloride (i.e. AlCl 3 ) and other inorganic salts, the aluminum ion in the aluminum salt is 1 / 10 to 1 / 10 of the ammonium ion (for ammonia water) or hydroxide ion (for sodium hydroxide) in the lye in terms of molar weight 4 (eg 1 / 4, 1 / 6 or 1 / 8), preferably 1 / 8-1 / 6, the concentration of aluminum ions in the aluminum salt solution is 0.5-1 mol / L. The lye is dropped into the inorganic aluminum salt solution in a vigorously stirred state, so that it can be rapidly dispersed in the r...

Embodiment 1

[0032] (1) Prepare certain 1200ml, 1mol / L ammonia water and 200ml, 1mol / L aluminum nitrate nonahydrate solution, and add ammonia water dropwise to the aluminum nitrate solution under vigorous stirring.

[0033] (2) With the addition of lye, more and more white precipitates will gradually form in the aluminum salt solution. Use pH test paper and a pH meter to monitor the pH of the aluminum salt solution at any time. When the pH of the system reaches 7.5, stop adding lye, continue to stir the mixed solution for 30 minutes.

[0034] (3) Suction filtration to collect the white insoluble matter, ultrasonic cleaning with a large amount of deionized water for 3 times to remove impurities mixed in the insoluble matter; after cleaning, suction filtration, collect the wet precipitate and weigh it to 40g.

[0035] (4) Add 400g of water to disperse the white insoluble matter, then stir and age the dispersion for 24 hours in a water bath at 85°C to obtain nano-scale aluminum sol. The parti...

Embodiment 2

[0037] (2) Prepare certain 1200ml, 1mol / L ammonia water and 150ml, 0.5mol / L aluminum sulfate solution, and add ammonia water dropwise to the aluminum nitrate solution under the condition of vigorous stirring.

[0038] (2) With the addition of lye, more and more white precipitates will gradually form in the aluminum salt solution. Use pH test paper and a pH meter to monitor the pH of the aluminum salt solution at any time. When the pH of the system reaches 7.7, stop adding lye, continue to stir the mixed solution for 30 minutes.

[0039] (3) Suction filtration to collect the white insoluble matter, ultrasonic cleaning with a large amount of deionized water for 3 times to remove the impurities mixed in the insoluble matter; suction filtration after cleaning, the wet precipitate was collected and weighed as 42g.

[0040] (4) Add 400g of water to disperse the white insoluble matter, then stir the dispersion in a water bath at 85°C and age for 24 hours to obtain a nano-scale alumin...

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Abstract

The invention relates to a method for controllably preparing nano aluminum sol by hydrolyzing inorganic aluminum salt in one step. The method comprises the following steps: respectively preparing an alkali liquor with a certain concentration and an inorganic aluminum salt solution, dropwise adding the alkali liquor into the inorganic aluminum salt solution under a vigorous stirring condition, gradually forming more and more white precipitates in the aluminum salt solution along with the addition of the alkali liquor, stopping dropwise adding the alkali liquor when the pH value of a system is between a certain numerical value, and continuously stirring the mixed solution; carrying out suction filtration to collect white insoluble substances, and carrying out ultrasonic cleaning for several times by using a large amount of deionized water to remove impurities in the insoluble substances; adding water to disperse white insoluble substances, and then stirring and aging dispersion liquid under a water bath condition to obtain the nanoscale aluminum sol. According to the method, no extra acid source needs to be introduced, H < + > generated by hydrolysis of inorganic aluminum salt can be fully utilized, and the preparation process of the aluminum sol is simplified; compared with a method for additionally introducing an acid source, the method is more beneficial to improving the atom utilization rate of a sol preparation system and conforms to the green chemistry concept.

Description

technical field [0001] The invention relates to the technical field of aluminum sol collagen materials, in particular to a simple and convenient preparation method of nano-scale aluminum sol. Background technique [0002] Aluminum sol, also known as boehmite sol, is composed of positively charged aluminum hydroxide nanoparticles, namely AlOOH·nH 2 O, a colloidal solution formed by dispersing into a solvent. At present, aluminum sol is widely used in the fields of alumina fibers, alumina castables, surfactants, molding binders, emulsifiers, and catalyst binders, while the development of aluminum sol for matrix in the field of composite materials is less. With the rapid development of the domestic aerospace industry, higher requirements are put forward for aerospace materials. Ceramic matrix composite materials with alumina substrates have the characteristics of high temperature resistance, oxidation resistance and high thermal stability, which can meet the requirements of th...

Claims

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Application Information

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IPC IPC(8): B01J13/00B82Y40/00B82Y30/00
CPCB01J13/0013B82Y40/00B82Y30/00
Inventor 顾雅琪张鸿超吕毅赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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