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Ultrasonic treating process of preparing spherical nanometer silica particle

A nano-silica, spherical technology, applied in the field of chemistry and chemical industry, can solve the problems of wide particle size distribution, irregular powder shape, agglomeration, etc., to achieve the effect of good dispersion and avoid agglomeration

Inactive Publication Date: 2006-05-17
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high-purity, ultra-fine nano-silica powder can be prepared by sol-gel technology, but the shape of the obtained powder is irregular, the agglomeration is serious, and the particle size distribution is wide

Method used

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  • Ultrasonic treating process of preparing spherical nanometer silica particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Pass 906ml, 24.72mol / L methanol solution and 122g pure ammonia into a 5L glass reactor, stir for 0.5 to 1 hour; dissolve 2.7gPEG1000 and 2.7gPAA2000 in 645ml deionized water, and dissolve the dispersant Add the aqueous solution of 4.48mol / L Si(OC 2 h 5 ) 4 , Ultrasonic treatment is carried out at the same time as the reaction; the mixed solution is ultrasonically treated at 25°C in an ultrasonic wave with a frequency of 20-100KHz for 5-60 minutes; after the reaction is completed, a uniform and stable sol is obtained; after the sol is frozen with liquid nitrogen, The silicon dioxide powder can be obtained by drying with a vacuum low-temperature freeze dryer for 24 to 48 hours.

[0021] Observed under a transmission electron microscope, it can be found that spherical nano-silica with good dispersion is generated.

Embodiment 2

[0022] Embodiment 2: Pass into 1306ml, 17.15mol / L dehydrated ethanol solution and 106g pure ammonia gas in 5L glass reactor, stir 0.5~1 hour; 8.1gPEG1000 and 2.7gPAA2000 are dissolved in 645ml deionized water, this Add the aqueous solution of dispersant to the reaction kettle, stir at high speed to make the solution evenly mixed, slowly add 1000ml, 4.48mol / L Si(OC 2 h 5 ) 4 , Ultrasonic treatment is carried out at the same time as the reaction; the mixed solution is ultrasonically treated at 25°C in an ultrasonic wave with a frequency of 20-100KHz for 5-60 minutes; after the reaction is completed, a uniform and stable sol is obtained; after the sol is frozen with liquid nitrogen, The silicon dioxide powder can be obtained by drying with a vacuum low-temperature freeze dryer for 24 to 48 hours.

[0023] Observed under a transmission electron microscope, it can be found that spherical nano-silica with good dispersion is generated.

Embodiment 3

[0024] Embodiment 3: Pass into 453ml, 24.72mol / L methanol solution, 653ml, 17.15mol / L absolute ethanol solution and 114g pure ammonia gas in 5L glass reactor, stir 0.5~1 hour; Mix 3.4gPEG1000 and 2gPAA2000 Dissolve in 645ml of deionized water, add the aqueous solution of the dispersant to the reaction kettle, stir at high speed to mix the solution evenly, slowly add 1000ml, 4.48mol / L Si(OC 2 h 5 ) 4 , Ultrasonic treatment is carried out at the same time as the reaction; the mixed solution is ultrasonically treated at 25°C in an ultrasonic wave with a frequency of 20-100KHz for 5-60 minutes; after the reaction is completed, a uniform and stable sol is obtained; after the sol is frozen with liquid nitrogen, The silicon dioxide powder can be obtained by drying with a vacuum low-temperature freeze dryer for 24 to 48 hours.

[0025] Observed under a transmission electron microscope, it can be found that spherical nano-silica with good dispersion is generated.

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Abstract

The present invention belongs to the field of chemical technology, and is especially one sol-gel process of preparing spherical solid nanometer silica powder. The preparation process includes the following steps: dissolving ammonia in certain amount in organic solvent, dissolving non-ionic high molecular dispersant and polyelectrolyte type dispersant in certain amount in deionized water, mixing the organic solution and the water solution via high speed stirring to maintain the homogeneity of the solution, adding Si(OC2H5)4 slowly to react while ultrasonic treatment and maintaining at 25 deg.c for 5-60 min until finishing the reaction to obtain homogeneous sol, and final vacuum freeze drying to obtain the spherical solid nanometer silica powder with high dispersivity and high chemical stability.

Description

technical field [0001] The invention relates to a sol-gel manufacturing method of spherical nano silicon dioxide powder. More specifically, the present invention relates to a manufacturing process for preparing a monodisperse, spherical and solid nano-silica powder by a sol-gel method, which belongs to the technical field of chemistry and chemical engineering. Background technique [0002] Monodisperse spherical nano-silica is a lightweight nano-amorphous solid material, which is widely used in catalysts, ceramics, biomaterials and scientific research, because it has the following advantages: (1) Large specific surface area and low density , good dispersion; (2) good chemical stability; (3) good biocompatibility, various organic functional groups can be modified on the surface of silica through different silylating agents, and the modified particles can be Combine with various biological materials. At present, high-purity, ultra-fine nano-silica powder can be prepared by s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16C01B33/157
Inventor 梁新杰李德慧周少雄李晓天高振英
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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