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Method for preparing highly dispersed silica by gradient pH precipitation process

A silicon dioxide, high dispersion technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as consumption of large sulfuric acid

Active Publication Date: 2019-08-16
QUECHEN SILICON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the pH value swings back and forth and consumes a large amount of sulfuric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of gradient pH precipitation method prepares the method for highly dispersed silicon dioxide, comprises the following steps:

[0037] (1) Dissolve sodium silicate with a modulus of 2.5 in water and prepare a density of 1.15g / cm 3 Sodium silicate solution, dilute concentrated sulfuric acid with water to prepare dilute sulfuric acid with a concentration of 1mol / L;

[0038] (2) After heating the sodium silicate solution to 70°C, under stirring, first add octylphenol polyoxyethylene ether to the sodium silicate solution, mix well, and then add dilute sulfuric acid until the pH of the system is 5 , and reacted for 10 minutes to obtain the mother liquor, the mass percent concentration of octylphenol polyoxyethylene ether was 0.5%;

[0039] (3) Add sodium silicate solution to the mother liquor of step (2), adjust the pH value of the system to 7, after reacting for 10 minutes, continue to add sodium silicate solution to adjust the pH value to 9, and continue adding Sod...

Embodiment 2

[0043] A kind of gradient pH precipitation method prepares the method for highly dispersed silicon dioxide, comprises the following steps:

[0044] (1) Dissolve sodium silicate with a modulus of 3.5 in water and prepare a density of 1.25g / cm 3 Sodium silicate solution, dilute concentrated sulfuric acid with water to prepare dilute sulfuric acid with a concentration of 3mol / L;

[0045] (2) After heating the sodium silicate solution to 90°C, under stirring, first add octylphenol polyoxyethylene ether to the sodium silicate solution, mix well, and then add dilute sulfuric acid until the pH of the system is 5 , and reacted for 10 minutes to obtain the mother liquor, the mass percent concentration of octylphenol polyoxyethylene ether was 1%;

[0046] (3) Add sodium silicate solution to the mother liquor of step (2), adjust the pH value of the system to 7, after reacting for 10 minutes, continue to add sodium silicate solution to adjust the pH value to 9, and continue adding Sodiu...

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PUM

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Abstract

The invention discloses a method for preparing highly dispersed silica by a gradient pH precipitation process. The method comprises the following steps: (1) preparing a sodium silicate solution and anacid solution; (2) adding a surfactant and the acid solution to the sodium silicate solution until the pH value of the system is 5 in order to obtain a mother liquor; (3) adding the sodium silicate solution to the mother liquor to adjust the pH value of the system to 11 from 5, and then adding the acid solution to the mother liquor to adjust the pH value of the system to 5 from 11; and (4) separating and drying the mother liquor to obtain the highly dispersed silica. Compared with the prior art, the method of the invention has the advantages of realization of the dispersion grade of the prepared silica product in rubber of above 9.7, and small acid consumption.

Description

technical field [0001] The invention relates to a method for preparing highly dispersed silicon dioxide by a gradient pH precipitation method. Background technique [0002] Silica is an amorphous white powder, non-toxic, odorless, and non-polluting. The surface is rich in hydroxyl groups. The particle size is small and the particle size distribution is uniform. It has a large specific surface area and high pore volume. As an environmentally friendly functional material, it is widely used in daily chemicals. Industries such as supplies and medicine and liquid carriers, especially the tire industry, have become important reinforcing materials for rubber tires. The traditional precipitation method to prepare silica is mainly obtained by reacting and aging water glass, sulfuric acid or hydrochloric acid at a certain pH value. During this process, an appropriate amount of dispersing aids, surfactants or modifiers can be added to prevent Excessive aggregation of primary particles...

Claims

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Application Information

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IPC IPC(8): C01B33/193
CPCC01B33/193
Inventor 王永庆毛善兵于方琪
Owner QUECHEN SILICON CHEM
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