A kind of preparation method of spinnable silica-alumina sol

A technology of silica-alumina sol and acid silica sol, which is applied to the preparation of aluminum hydroxide, chemical instruments and methods, silicon compounds, etc., can solve the problems of aluminum sol not having spinnability, etc., and achieve low cost, simple process, and reduced energy consumption. consumption effect

Active Publication Date: 2020-04-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent document CN103272563A discloses a method for preparing and using an aluminum hydroxide film based on sodium aluminate and used to adsorb Cr(VI). The method uses sodium aluminate solution and hydrochloric acid to react to obtain aluminum hydroxide precipitation, and then adds peptizer Peptization, so that the peptized ions are evenly dispersed, further adding polyvinyl alcohol (PVA) as a film-forming aid, aging for a certain period of time to form a stable gel, and an aluminum hydroxide film is obtained after coating, which can be used to adsorb Cr(VI), However, the aluminum sol obtained by this method does not have spinnability

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  • A kind of preparation method of spinnable silica-alumina sol
  • A kind of preparation method of spinnable silica-alumina sol
  • A kind of preparation method of spinnable silica-alumina sol

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Embodiment 1

[0048] A preparation method of spinnable silica-alumina sol, comprising steps as follows:

[0049] (1) Preparation of Aluminum Hydroxide Suspension

[0050] 1500g AlCl 3 ·6H 2 Dissolve O in 10L of triple distilled water, add 1270g of ammonia water with a mass fraction of 25%, stir evenly, react at 20-25°C for 2.0h, filter the reaction product, wash the filter cake with triple distilled water until the conductivity of the filtrate is 1.38mS / cm to obtain amorphous aluminum hydroxide, which is then added to water to obtain a suspension with a solid content of 5.6%;

[0051] (2) Preparation of aluminum sol

[0052] Add 325g of formic acid solution and 373g of acetic acid to the suspension obtained in step (1) and stir, react at 35-40°C for 8h to obtain a uniform and transparent aluminum sol with a pH value of 4.0 and a solid content of 5%;

[0053] (3) Preparation of spinnable silica-alumina sol

[0054] 6330g of aluminum sol obtained in step (2) and 821.1g of newly prepared...

Embodiment 2

[0062] A preparation method of spinnable silica-alumina sol, comprising steps as follows:

[0063] (1) Preparation of Aluminum Hydroxide Suspension

[0064] With embodiment 1;

[0065](2) Preparation of aluminum sol

[0066] Add 162.4g of formic acid solution and 559.4g of acetic acid to the suspension obtained in step (1), stir, and react at 35-40°C for 8h to obtain a uniform and transparent aluminum sol with a solid content of 5.0% and a pH value of 3.9;

[0067] (3) Preparation of spinnable silica-alumina sol

[0068] 6354g of the aluminum sol obtained in step (2) and 821.1g of the newly prepared solid content of 15% acidic silica sol are uniformly mixed at 35°C to obtain a mixed sol, and the mixed sol is at 40°C and a vacuum of 0.095MPa. The mixed sol was aged to a viscosity of 20 Pa·s to obtain a spinnable silica-alumina sol.

[0069] The above-mentioned spinnable silica-alumina sol is centrifuged to obtain gel fiber cotton. The process conditions are as follows: the ...

Embodiment 3

[0071] A preparation method of spinnable silica-alumina sol, comprising steps as follows:

[0072] (1) Preparation of Aluminum Hydroxide Suspension

[0073] 1500g AlCl 3 ·6H 2 O was dissolved in 10.5L of triple distilled water. After complete dissolution, 1863.88g of 40% sodium hydroxide solution was added, stirred evenly, and reacted at 30-35°C for 2.5h. Wash until the conductivity of the filtrate is 1.42mS / cm to obtain amorphous aluminum hydroxide, which is then added to triple distilled water to obtain a suspension with a solid content of 7.5%;

[0074] (2) Preparation of aluminum sol

[0075] Add 487.2g of formic acid solution and 186.5g of acetic acid to the suspension obtained in step (1), stir, and react at 45-50°C for 9.5h to obtain a uniform and transparent aluminum sol with a solid content of 6.5% and a pH value of 4.0;

[0076] (3) Preparation of spinnable silica-alumina sol

[0077] Mix 4877g of aluminum sol obtained in step (2) with 905.6g of newly prepared a...

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Abstract

The invention provides a preparation method of spinnable silicon-aluminum sol. The preparation method includes: using amorphous-state aluminum hydroxide synthesized by inorganic aluminum salt and alkaline liquor as the aluminum source, adding formic acid and acetic acid to prepare aluminum sol, mixing the aluminum sol with newly prepared acid silica sol of different proportions, and performing concentration and aging to obtain the spinnable silicon-aluminum sol. The preparation method has the advantages that the silicon-aluminum sol prepared by the method is stable in property and capable of being stored for a long time without coagulation and deterioration, the prepared spinnable sol can be prepared into alumina ceramic fiber cotton through centrifugal swinging or blowing, and the sol canbe prepared into alumina ceramic continuous fibers through dry spinning; the preparation method is simple in process, short in flow, green and free of pollution, low in cost and easy to achieve large-scale preparation.

Description

technical field [0001] The invention relates to a preparation method of spinnable silica-alumina sol, which belongs to the field of inorganic nanometer materials. Background technique [0002] Alumina sol and silica sol are colloidal solutions in which alumina and silica particles are evenly dispersed in water. They have the characteristics of easy dispersibility, reversible water solubility and good adsorption. They can be used as high-purity refractory binders and refractory ceramic utensils. , catalyst carrier, molecular sieve, textile fiber surface treatment agent, etc. Among them, spinnable silica-alumina sol can be used to prepare alumina ceramic continuous fiber and fiber cotton. [0003] At present, there are many methods for preparing spinnable silica-alumina sol. The general process is to first synthesize alumina sol, then introduce silica sol, concentrate and age after mixing; or directly synthesize silica-alumina sol with silicon source and aluminum source, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C01F7/34C01F7/02C01B33/146
CPCC01B33/146C01F7/026C01F7/34D01F9/08
Inventor 陈代荣张延芳贾玉娜焦秀玲
Owner SHANDONG UNIV
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