Method for preparing silica sol with large particle size

A technology of silica sol and large particle size, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of many process procedures and large energy consumption, and achieve good results and simple and easy methods

Inactive Publication Date: 2014-06-25
陆曹生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ion exchange method is a method commonly used in China, but it has many process procedures and consumes a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of large particle size silica sol in this embodiment comprises the following steps:

[0023] In the first step, the silicon dioxide mother nucleus solution is prepared by hydrolysis of elemental silicon. The catalyst used for hydrolysis is sodium hydroxide, and the additive is methanol. The mass ratio of the elemental silicon, sodium hydroxide, and methanol is 100:1:0.2. Afterwards, heat, evaporate and purify in a vacuum environment, so that the concentration of the silica mother nucleus reaches more than 55%. When evaporating and purifying, high-temperature steam is introduced from the bottom, and the heating temperature is 95°C;

[0024] The second step is to soak elemental silicon in boiling water to activate it, and prepare an active silicic acid solution, the concentration of which is 15%;

[0025] In the third step, the silicic acid solution is added in batches to the silica mother nucleus solution, and the pH is adjusted by adding a mixed s...

Embodiment 2

[0030] The preparation method of large particle size silica sol in this embodiment comprises the following steps:

[0031] In the first step, the silicon dioxide mother nucleus solution is prepared by hydrolysis of elemental silicon. The catalyst used for hydrolysis is sodium hydroxide, and the additive is methanol. The mass ratio of the elemental silicon, sodium hydroxide, and methanol is 100:1:0.2. Afterwards, heat, evaporate and purify in a vacuum environment, so that the concentration of the silica mother nucleus reaches more than 50%. When evaporating and purifying, high-temperature steam is introduced from the bottom, and the heating temperature is 95°C;

[0032] The second step is to soak elemental silicon in boiling water to activate it, and prepare an active silicic acid solution, the concentration of which is 20%;

[0033] The third step is to add the silicic acid solution in batches to the silica mother nucleus solution, and adjust the pH by adding a mixed solution ...

Embodiment 3

[0038] The preparation method of large particle size silica sol in this embodiment comprises the following steps:

[0039] In the first step, the silicon dioxide mother nucleus solution is prepared by hydrolysis of elemental silicon. The catalyst used for hydrolysis is sodium hydroxide, and the additive is methanol. The mass ratio of the elemental silicon, sodium hydroxide, and methanol is 100:1:0.2. Afterwards, heat, evaporate and purify in a vacuum environment, so that the concentration of the silica mother nucleus reaches more than 50%. When evaporating and purifying, high-temperature steam is introduced from the bottom, and the heating temperature is 95°C;

[0040] The second step is to soak elemental silicon in boiling water to activate it, and prepare an active silicic acid solution, the concentration of which is 18%;

[0041] In the third step, the silicic acid solution is added in batches to the silica mother nucleus solution, and the pH is adjusted by adding a mixed s...

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Abstract

The invention relates to a method for preparing silica sol with large particle size. The method includes: firstly preparing a high-purity silicon dioxide mother nucleus solution by using monatomic silicon, then coating the mother nucleus and purifying the silica sol. Since methanol is added in hydrolysis, silicon dioxide coating can be inhibited, such that the prepared silicon dioxide mother nucleuses are distributed in a narrow particle size, thereby being beneficial to obtaining silica sol with large particle size, in which particle size is uniform. The mother nucleus solution is evaporated in vacuum to completely volatilize the methanol, and high temperature steam is filled from the bottom during evaporation and purification to volatilize the methanol more completely, so as not to generate unbeneficial influence to subsequent coating; and for the silica sol with large particle size obtained after multiple coating procedures, a detection shows that various indexes of the prepared silica sol are located on an international advanced level.

Description

technical field [0001] The invention relates to a method for preparing silica sol, in particular to a method for preparing silica sol with large particle size. Background technique [0002] Silica sol, also known as silicic acid hydrosol or silica hydrosol, has been widely used in precision casting, catalyst carrier, coating, papermaking and textile industries. Due to its good water resistance, high temperature resistance, air permeability, dispersibility, skid resistance and non-polluting properties, silica sol has a special and important position in various fields. The current industrially mature preparation methods are ion exchange method and elemental silicon dissolution method. However, most of the products are silica sol with small particle size, and the storage time is short, which is inferior to developed countries in terms of variety and quality, especially in the production and application of high concentration, large particle size silica sol and quick-drying rein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/141
Inventor 陆曹生
Owner 陆曹生
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