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Method for producing colloidal silica

A manufacturing method and technology of silica gel are applied in the field of silica gel manufacturing to achieve the effect of high work efficiency

Inactive Publication Date: 2009-09-30
FUSO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, silica gel containing silicon with a desired particle size can be obtained, but processes such as thermal aging, ion exchange treatment, and especially concentration operations to increase the concentration of silicon are required. extra time and money

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] Metallic silicon powder with an average particle diameter of 40 μm was pulverized to produce metallic silicon with an average particle diameter of 5 μm. The silicon metal is acidified in a drier in atmospheric air, applying an inert treatment.

[0130] Pour 165.1 g of tap water, 1.33 g of sodium hydroxide (containing special grade 97%) as an alkaline additive, and Add 1.06g of ammonium nitrate as the agent, and heat to 80°C during stirring. For another 4 hours, a slurry liquid prepared by dispersing 98.8 g of metal silicon after inert treatment to 334.8 g of tap water was added at a constant speed with a quantitative pump. In parallel with this, 22.9 g of a 10% by weight aqueous sodium hydroxide solution was added at a constant rate using a metered pump over a period of 4 hours.

[0131] After another 2 hours of dissolution reaction, after cooling, pass through a membrane filter (membrane filter) with a diameter of 1 μ and 90 mm, and filter under reduced pressure at 0...

Embodiment 2

[0133] As a dispersant, replace ammonium nitrate with sodium chloride (having the same chemical equivalent as ammonium nitrate), and the others are the same as in Example 1. The concentration of the generated silica gel is 34.34% by weight, the primary particle size is 23.46nm, the secondary particle size is a monodisperse particle of 47.4nm, and the kinematic viscosity is 2.49mm 2 / s. Also, the filtration amount of 10 minutes of vacuum filtration was 228.8 g, and the yield was 80%.

Embodiment 3

[0135] As a dispersant, triammonium citrate (having the same chemical equivalent as ammonium nitrate) was used instead of ammonium nitrate. Others are the same as in Example 1. The concentration of the generated silica gel is 31.26% by weight, the primary particle size is 19nm, the secondary particle size is a monodisperse particle of 27.8nm, and the kinematic viscosity is 3.54mm 2 / s. Also, the filtration amount of 10 minutes of vacuum filtration was 220.4 g, and the yield was 81%.

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PUM

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Abstract

The present invention discloses a method for producing a colloidal silica using silicon metal as a raw material, which enables to produce a colloidal silica having high concentration and low viscosity. Also disclosed a method for producing a colloidal silica using silicon metal as a raw material, which enables to produce a colloidal silica in short time with high yield without comprising a concentration step. Further disclosed is a method for producing a colloidal silica, which enables to easily control the particle size of silica contained in a colloidal silica. Specifically disclosed is a method for producing a colloidal silica comprising a step for obtaining a colloidal silica by reacting silicon metal (Si) with water in an aqueous solution containing an alkaline catalyst and a dispersing agent, wherein the dispersing agent is composed of one or more ionic substances selected from inorganic acids, organic acids and their salts. Also specifically disclosed is a method for producing a colloidal silica comprising a step for controlling the particle size of silica by adjusting the addition rate of silicon metal into an aqueous solution containing an alkaline catalyst and a dispersing agent.

Description

technical field [0001] The present invention relates to a method for producing a new type of silica gel suitable for use as an abrasive for substrates such as silicon wafer compound semiconductors, glass, and hard disks. A method for producing silica gel in which the reaction is carried out in an aqueous solution of an agent to obtain silica gel. Background technique [0002] In the past, silica gel was used in abrasives and anti-slip agents for metal materials, etc. As a method for producing such silica gel, the following examples can be given. One is a method obtained by hydrolysis and polycondensation of alkoxysilane that uses metal silicon as a raw material; the other is obtained by using ion exchange resins in water glass obtained by dissolving metal silicon in alkali to make it neutral or acidic. method; and a method of heating an aqueous solution containing an inorganic alkali monovalent metal compound, ammonia water and amine, and mixing metal silicon powder or blo...

Claims

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Application Information

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IPC IPC(8): C01B33/141
CPCC01B33/1412
Inventor 小西拓
Owner FUSO CHEM
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