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Preparation method for high-dispersion nano silicon dioxide

A nano-silicon dioxide, silicon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, nanotechnology, etc., can solve the problems of uneven reaction, high surface energy, poor micro-mixing, etc. The effect of uniform saturation and uniform particle size distribution

Inactive Publication Date: 2014-09-24
TSINGHUA UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high surface energy of silica particles, the silanol is easy to polymerize; the microscopic mixing of materials is poor, the reaction is uneven in the system, and the growth of particles is difficult to control. The silica prepared by the precipitation method has poor dispersion. , the disadvantage of uneven primary particle size distribution

Method used

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  • Preparation method for high-dispersion nano silicon dioxide
  • Preparation method for high-dispersion nano silicon dioxide

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preparation example Construction

[0016] See figure 1 , the invention provides a kind of preparation method of highly dispersed nano silicon dioxide, it comprises the following steps:

[0017] S1: providing a silicate solution containing a surfactant;

[0018] S2: Provide a microporous membrane, so that the above-mentioned silicate solution flows along the surface of the microporous membrane;

[0019] S3: Provide an acidic solution, make the acidic solution pass through the microporous membrane and directly add to the flowing silicate solution, and react to form silica precipitation; and,

[0020] S4: Treating the silica precipitate to obtain highly dispersed nano silica.

[0021] In step S1, the silicate is a soluble salt of silicic acid, which may be sodium silicate, potassium silicate, or ammonium silicate. In this embodiment, the silicate is sodium silicate solution. The sodium silicate solution is an aqueous sodium silicate solution with a concentration of 0.2-2 mol / L (mol / L). The surfactant can be s...

Embodiment 1

[0028] 1) Prepare a sodium silicate aqueous solution with a concentration of 1 mol / L, add a surfactant sodium carboxymethylcellulose with a mass fraction of 0.20%, and make it flow at a flow rate of 10 m / s.

[0029] 2) Prepare a sulfuric acid aqueous solution with a concentration of 0.75 mol / L, and make it pass through the microporous membrane at a flow rate of 6 m / s, and disperse from the vertical direction to the sodium silicate aqueous solution with the surfactant sodium carboxymethyl cellulose added middle.

[0030] 3) Sulfuric acid droplets diffuse and react in sodium silicate aqueous solution at 70°C to form silica precipitates, and then undergo aging, filtration, washing, drying, and crushing to obtain highly dispersed nano-silica particles. Its specific surface area is 130 square meters per gram (m 2 / g), the primary particle size is 15 nanometers (nm), the transmission electron microscope photo of the product is as follows image 3 shown.

Embodiment 2

[0032] 1) Prepare a sodium silicate aqueous solution with a concentration of 2 mol / L, add a surfactant sodium carboxymethylcellulose with a mass fraction of 0.50%, and make it flow at a flow rate of 12 m / s.

[0033] 2) Prepare a sulfuric acid aqueous solution with a concentration of 1.5 mol / L, and make it pass through the microporous membrane at a flow rate of 8 m / s, and disperse from the vertical direction to the sodium silicate aqueous solution with the surfactant sodium carboxymethyl cellulose added middle.

[0034] 3) Sulfuric acid droplets diffuse and react in sodium silicate aqueous solution at 50°C to form silica precipitates, and then undergo aging, filtration, washing, drying, and crushing to obtain highly dispersed nano-silica particles. Its specific surface area is 160 m 2 / g, the primary particle size is 12nm, the transmission electron microscope photo of this product is as Figure 4 shown.

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Abstract

The invention provides a preparation method for high-dispersion nano silicon dioxide. The method comprises the following steps of: providing acidy liquor and a microporous membrane; preparing a certain amount of silicate liquor, wherein the silicate liquor contains a surfactant, so that the silicate liquor flows along the surface of the microporous membrane; vertically adding the acidy liquor into flowing silicate liquor through the microporous membrane; enabling the acidy liquor and the silicate liquor to generate reaction at a certain temperature to generate silicon dioxide precipitates; and treating the silicon dioxide precipitates to obtain the high-dispersion nano silicon dioxide. The method for preparing the silicon dioxide is low in cost, controllable in process and simple; and the prepared silicon dioxide particle is moderate in specific surface area, uniform in particle diameter distribution and good in dispersion.

Description

technical field [0001] The invention relates to a preparation method of highly dispersed nano silicon dioxide. Background technique [0002] Due to the good affinity between the highly dispersed nano-silica particles and the functional groups of the rubber, it can significantly reduce the rolling resistance of the rubber compound, reduce heat generation, and improve the wet skid resistance, tear resistance and wear resistance of the tire , anti-aging performance, is widely used in the manufacture of high-performance "green tires" with low rolling resistance. [0003] At present, the precipitation method is widely used in the preparation of silica due to its advantages such as easy availability of raw materials, simple process, low energy consumption, and low cost. Due to the high surface energy of silica particles, the silanol is easy to polymerize; the microscopic mixing of materials is poor, the reaction is uneven in the system, and the growth of particles is difficult to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18B82Y30/00
Inventor 王玉军骆广生张田
Owner TSINGHUA UNIV
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