Process for preparing nm silicon dioxide from alkali metal silicate

A nano-silica and silicate technology, applied in the direction of silica, silicon oxide, etc., can solve the problems of complex process, high raw material cost, and long synthesis cycle, and achieve simple synthesis process route, uniform particle distribution, and dispersed good sex effect

Inactive Publication Date: 2004-09-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main synthetic routes of silicon dioxide. One is the organic route, that is, hydrolyzes with silicate and alcohol under acidic or alkaline conditions. Silica (Chinese patent ZL 95102373.X), this method has complex process, long synthesis cycle, high raw material cost and separation of organic matter between particles; another inorganic route is obtained by reacting water glass with inorganic acid or other flocculants Silica powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put 500ml of sodium silicate solution with a concentration of 80g / L into the reaction kettle as the mother liquor, then add 4ml of 0.02mol / L sodium dodecylbenzenesulfonate and stir, and then use a constant flow pump to evenly add the solution with a concentration of 0.5 mol / L of NH 4 Cl solution is about 200ml, after adding NH 4 Cl while increasing the stirring speed. After the milky white precipitate completely appeared in the reaction kettle, the temperature was raised to 70°C, and the stirring speed was reduced at the same time. After aging at a constant temperature of 70° C. for 6 hours, the obtained product was repeatedly washed and filtered with distilled water. Then bake at 120° C. for 8 hours to obtain the desired nano silicon dioxide. The obtained nano-silica is 20nm by transmission electron microscope analysis.

Embodiment 2

[0016] Under the condition of other conditions unchanged in Example 1, the concentration of the mother liquor sodium silicate solution was adjusted to 120 g / L, and the obtained sample was analyzed by a transmission electron microscope to be silicon dioxide particles of 85 nm.

Embodiment 3

[0018] Under the condition that the other conditions of Example 1 remain unchanged, the mother liquor uses 100g / L Li 2 SiO 3 , The resulting sample was analyzed by a transmission electron microscope to be 40nm silicon dioxide particles.

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Abstract

The invention relates to a process for preparing grain size controlled, high dispersion nano silicon oxide, wherein the silicate of alkaline metal and inorganic salts capable of producing H+ through hydrolysis are used as the raw material for synthesizing nano silica flour of different grain sizes through the dispersion of the surface active agent.

Description

technical field [0001] The invention relates to a method for preparing silicon dioxide, in particular to a method for preparing nanometer silicon dioxide from alkali metal silicate. Background technique [0002] Nanoparticles equivalent to 10 3 A collection of molecules, in which the molecules on the surface of the particle account for more than half of the total number of molecules. Due to the special structure of nanomaterials, it produces special effects: such as small size effect, quantum effect (macroscopic quantum tunneling effect), surface effect and interface effect. Silica is not only an important semiconductor material, but also plays an important role as a filler in plastics, rubber and optoelectronic materials. The particle size of the silica particles affects the properties of the material. With the development and application of new materials, the preparation of nano-scale silicon dioxide has great application value. At present, there are two main synthetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113C01B33/12
Inventor 拜永孝姚培洪朱博超杨斌朱雅杰魏红徐晓敏贾军纪王德平张长军
Owner PETROCHINA CO LTD
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