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Method for preparing nanometer silicon dioxide material at normal temperature

A nano-silica, conditional technology, applied in the direction of silica, silicon oxide, nanotechnology, etc., can solve the problems of nano-silica production impact, strict equipment requirements, and low apparent density, and achieve good application prospects, The effect of low cost and small particle size

Inactive Publication Date: 2013-08-28
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas phase method has uniform particle size and low apparent density, but the equipment requirements are strict and the cost is high
The current precipitated silica is generally incubated between 70-90°C for more than 8 hours, which is costly. For example, the reaction temperature of the patent CN 1865137A is 75°C. Therefore, the development of a preparation method under normal temperature conditions will reduce the cost and has a good guiding significance , will have a huge impact on the production of nano-silica

Method used

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  • Method for preparing nanometer silicon dioxide material at normal temperature
  • Method for preparing nanometer silicon dioxide material at normal temperature
  • Method for preparing nanometer silicon dioxide material at normal temperature

Examples

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Embodiment 1

[0031] (1) Sodium sodium chloride and 120g sodium chloride were dissolved in deionized water to obtain a sodium silicate mother liquor, and 98% concentrated sulfuric acid was configured into a 2.0mol / L sulfuric acid solution to obtain an acid mother liquor; wherein the sodium silicate modulus was 3.8, the mass percent concentration of sodium silicate in sodium silicate mother liquor is 30%.

[0032] (2) Put the mother liquor of sodium silicate into a 5L reaction kettle, keep it warm at 30°C, and add the mother liquor of sulfuric acid dropwise at a speed of 20mL / min at a stirring speed of 130r / min until pH=5.0, and keep stirring at 30°C Keep for 6h;

[0033] (3) The obtained product is then separated, washed, and dried at 50° C. for 6 hours to obtain nano-silica particles.

[0034] The transmission electron microscope picture of the nano silicon dioxide particle that scheme 1 makes sees Figure 5 , the average particle size estimated from the figure is 16nm. The X-ray diffra...

Embodiment 2

[0036] (1) Sodium sodium chloride and 120g sodium chloride were dissolved in deionized water to obtain a sodium silicate mother liquor, and 98% concentrated sulfuric acid was configured into a 2.0mol / L sulfuric acid solution to obtain an acid mother liquor; wherein the sodium silicate modulus was 4.0, the mass percentage concentration of sodium silicate in sodium silicate mother liquor is 20%.

[0037] (2) Put the sodium silicate mother liquor into a 5L reaction kettle, keep it warm at 30°C, and add the sulfuric acid mother liquor dropwise at a speed of 10mL / min at a stirring speed of 120r / min until pH=6.0, and keep stirring at 30°C keep 8h;

[0038] (3) The obtained product is then separated, washed, and dried at 60° C. for 4 hours to obtain nano-silica particles.

[0039] The transmission electron microscope picture of the nano silicon dioxide particle that scheme 2 makes is shown in Image 6 , the average particle size estimated from the figure is 23nm, and the BET specif...

Embodiment 3

[0041] (1) Sodium sodium chloride and 120g sodium chloride were dissolved in deionized water to obtain a sodium silicate mother liquor, and 98% concentrated sulfuric acid was configured into a 2.0mol / L sulfuric acid solution to obtain an acid mother liquor; wherein the sodium silicate modulus was 3.8, the mass percentage concentration of sodium silicate mother liquor is 10%.

[0042] (2) Put the sodium silicate mother liquor into a 5L reaction kettle, keep it warm at 30°C, and add the sulfuric acid mother liquor dropwise at a speed of 20mL / min at a stirring speed of 120r / min until pH=7.0, and keep stirring at 35°C keep 8h;

[0043] (3) The obtained product is then separated, washed, and dried at 70° C. for 4 hours to obtain nano-silica particles.

[0044] The transmission electron microscope picture of the nano silicon dioxide particle that scheme 3 makes sees Figure 7 , the average particle size estimated from the figure is 43nm, and the BET specific surface area is 174m ...

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Abstract

The invention relates to a method for preparing a nanometer silicon dioxide material at normal temperature. The method comprises the following steps of dissolving sodium metasilicate and sodium chloride into deionized water to obtain a sodium silicate mother liquor; and dropwise adding an acid mother liquor into the sodium silicate mother liquor under the conditions of insulating heat at 25-35 DEG C and stirring, insulating heat at 25-35 DEG C till the pH value is 5.0-7.0, stirring for reacting for 6-10 hours, then separating, washing and drying to obtain the nanometer silicon dioxide material. The method is used for preparing the nanometer silicon dioxide material at normal temperature, and has the characteristics of being simple to operate, easy for large-scale production, and low in cost. The prepared nanometer silicon dioxide particle is a mesoporous material, has small grain size, large specific surface area and pore volume, and has a good application prospect. The method can be used for processing waste sodium metasilicate into the nanometer silicon dioxide material, thus being capable of turning waste into wealth, and reducing resource waste.

Description

technical field [0001] The invention belongs to the field of preparation of silicon dioxide materials, in particular to a method for preparing nanometer silicon dioxide materials at normal temperature. Background technique [0002] Nano-silica is a very important inorganic non-metallic nano-material, which is an amorphous white powder. In industrial production, it is also called white carbon black. Nano silicon dioxide has small size effect, surface interface effect, quantum size effect and macroscopic quantum tunnel effect and special optical and electrical properties, high magnetoresistance phenomenon, non-linear resistance phenomenon and high strength, high toughness, Good stability and other singular characteristics. Therefore, nano-silica is widely used in various fields, showing its broad application prospects and huge commercial potential in the fields of rubber modification, engineering plastics, ceramics, biomedicine, catalysts, optics, building materials, and modi...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y30/00
Inventor 周兴平李申徐腾张凤凯
Owner DONGHUA UNIV
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