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Preparation method of nano silicon dioxide powder

A technology of nano-silica and powder, which is applied in the field of nano-materials, can solve the problems of easy agglomeration and growth of primary particles, low purity of products, complex combustion process, etc., achieve good dispersion, shorten the preparation cycle, and prepare short cycle effect

Inactive Publication Date: 2012-01-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, methods such as carbonization reaction method and reverse micellar solution method to prepare ultrafine silica have defects such as cumbersome manufacturing process and low purity of the product.
The combustion process is complicated; the particle size obtained by the precipitation method is large and the structure is loose; the heat treatment temperature of the traditional sol-gel method is high, and the Si-OH silanol groups on the surface of the silica are removed by high temperature, and the original Particles are easy to agglomerate and grow

Method used

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  • Preparation method of nano silicon dioxide powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of nano silicon dioxide powder body, comprises the following steps:

[0020] 1) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 25%, then add ethyl orthosilicate according to the molar ratio of ethyl orthosilicate: citric acid = 1: 1.5, stir to make orthosilicate Dissolve ethyl acetate; then add 100ml of absolute ethanol and 64g of polyethylene glycol in turn, heat to 50°C and stir to dissolve completely; adjust the pH value to 5.0 with ammonia water to make a precursor, evaporate in a water bath at 80°C until white wet gel;

[0021] 2) drying and foaming the wet gel in a furnace at 130°C under an air atmosphere to obtain a dry gel;

[0022] 3) Put the xerogel into a kiln for calcination at a constant temperature of 600° C. under an air atmosphere, and take it out after calcination for 5 hours to obtain a loose amorphous nano-silica powder with a particle size of 10-20 nm.

[0023] The SEM photogra...

Embodiment 2

[0025] The preparation method of nano silicon dioxide powder body, comprises the following steps:

[0026] 1) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 28%, then add ethyl orthosilicate according to the molar ratio of ethyl orthosilicate: citric acid = 1: 2.5, stir to make orthosilicate Dissolve ethyl acetate; then add 150ml of absolute ethanol and 96g of polyethylene glycol in turn, heat to 70°C and stir to dissolve completely; adjust the pH value to 8.0 with ammonia water to make a precursor, evaporate in a water bath at 90°C until white wet gel;

[0027] 2) drying and foaming the wet gel in a furnace at 140°C under an air atmosphere to obtain a dry gel;

[0028] 3) Put the xerogel into a kiln for calcination at a constant temperature of 900° C. under an air atmosphere, and take it out after calcination for 5 hours to obtain loose amorphous nano-silica powder with a particle size of 10-20 nm.

Embodiment 3

[0030] The preparation method of nano silicon dioxide powder body, comprises the following steps:

[0031] 1) Dissolve 192.14g (1mol) of citric acid in 300ml of ammonia water with a volume concentration of 25%, then add ethyl orthosilicate according to the molar ratio of ethyl orthosilicate: citric acid=1:2, stir to make orthosilicate Dissolve ethyl acetate; then add 120ml of absolute ethanol and 80g of polyethylene glycol in turn, heat to 65°C and stir to dissolve completely; adjust the pH value to 6.0 with ammonia water to make a precursor, evaporate in a water bath at 85°C until white wet gel;

[0032] 2) drying and foaming the wet gel in a furnace at 145°C under an air atmosphere to obtain a dry gel;

[0033] 3) Put the xerogel into a kiln for calcination at a constant temperature of 800° C. under an air atmosphere, and take it out after calcination for 4 hours to obtain loose amorphous nano-silica powder with a particle size of 10-20 nm.

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Abstract

The invention discloses a preparation method of nano silicon dioxide powder. The preparation method comprises the following steps of: using citric acid, ethyl orthosilicate and polyethylene glycol as raw materials, and ammonia as a pH modifying agent to prepare a precursor; and performing water bath, drying and calcination on the precursor to prepare the silicon dioxide powder. The prepared powder is amorphous particle with the particle size of 10 to 20 nm. The preparation method of the nano silicon dioxide powder has the advantages of short preparation period, high purity, high yield, simpleprocess equipment and low cost.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a preparation method of nanometer silicon dioxide powder. Background technique [0002] Nano-silica powder is a new type of nano-scale amorphous solid material. It is a non-toxic, odorless and non-polluting inorganic non-metallic material. It has important roles in construction, chemical industry, aerospace industry, agriculture, etc. application. Nano-silica powder exhibits unique properties in terms of sound, light, electricity, magnetism and thermodynamics, and is widely used in microelectronics, information materials, coatings, rubber, plastics, crop seed treatment agents, polishing agents, and advanced refractory materials and papermaking etc. It is one of the current research hotspots to develop nano-scale silica materials and produce high-purity, high-tech products. [0003] At present, there are many methods for preparing nano-silica powder, but whether it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
Inventor 伍媛婷王秀峰
Owner SHAANXI UNIV OF SCI & TECH
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