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Preparation method of low-specific-surface-area high-oil-absorption-value friction type silicon dioxide

A low specific surface area, silicon dioxide technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of excessive specific surface area, toothpaste viscosity after expansion, etc., to reduce specific surface area, reduce viscosity, The effect of process stability

Inactive Publication Date: 2018-06-22
GUANGZHOU FEIXUE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem that the specific surface area of ​​the existing toothpaste friction-type silica is too large, resulting in post-swelling of toothpaste viscosity, the invention provides a preparation method of friction-type silica with a low specific surface area and high oil absorption value , by changing the preparation process, the silica can reduce the specific surface area under the premise of maintaining a high water absorption and oil absorption value, thereby reducing the viscosity of the toothpaste powder and stabilizing the viscosity of the toothpaste within a certain range. There will be a significant increase after

Method used

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  • Preparation method of low-specific-surface-area high-oil-absorption-value friction type silicon dioxide
  • Preparation method of low-specific-surface-area high-oil-absorption-value friction type silicon dioxide
  • Preparation method of low-specific-surface-area high-oil-absorption-value friction type silicon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1. Friction-type silica with low specific surface area and high oil absorption value of the present invention and its preparation

[0025] S1, inject 8m ethanol aqueous solution into the reaction tank 3 , heat up to 60°C, and start stirring;

[0026] S2, drop water glass solution 10m in the reaction tank at the same time 3 Perform parallel flow reaction with sulfuric acid solution, control the titration rate of sulfuric acid solution to control the pH of the reaction process to be 6.0, at the same time, add 1 to 2 m 3 Anhydrous ethanol to keep the volume ratio of ethanol and water in the reaction system at 1:3, and keep the reaction temperature at 60°C. After the water glass solution is added dropwise, stop adding the sulfuric acid solution and continue stirring for 45 minutes;

[0027] S3. Stop stirring and heating, age for 1 hour, press filter and wash the formed silicon dioxide to remove sulfate, dry and pulverize the washed silicon dioxide to obtain fricti...

Embodiment 2

[0033] Example 2. Friction-type silica with low specific surface area and high oil absorption value of the present invention and its preparation

[0034] S1, inject 12m of ethanol aqueous solution into the reaction tank 3 , heat up to 70°C, and start stirring;

[0035] S2, drop water glass solution 10m in the reaction tank at the same time 3 Conduct parallel flow reaction with sulfuric acid solution, control the titration rate of sulfuric acid solution to control the pH of the reaction process to be 6.8, at the same time, add 1 to 2 m 3 Dehydrated ethanol to keep the volume ratio of ethanol and water in the reaction system as 1:7, and keep the reaction temperature at 70°C. After the water glass solution is added dropwise, stop adding the sulfuric acid solution and continue to stir for 60 minutes;

[0036] S3. Stop stirring and heating, age for 1 hour, press filter and wash the formed silicon dioxide to remove sulfate, dry and pulverize the washed silicon dioxide to obtain fr...

Embodiment 3

[0042] Example 3. Friction-type silica with low specific surface area and high oil absorption value of the present invention and its preparation

[0043] S1, inject 10m of ethanol aqueous solution into the reaction tank 3 , heat up to 65°C, and start stirring;

[0044] S2, drop water glass solution 10m in the reaction tank at the same time 3 Perform parallel flow reaction with sulfuric acid solution, control the titration rate of sulfuric acid solution to control the pH of the reaction process to be 6.5, at the same time, add 1 to 2 m 3 Anhydrous ethanol to keep the volume ratio of ethanol and water in the reaction system at 1:5, and keep the reaction temperature at 65°C. After the water glass solution is added dropwise, stop adding the sulfuric acid solution and continue to stir for 50 minutes;

[0045] S3. Stop stirring and heating, age for 1 hour, press filter and wash the formed silicon dioxide to remove sulfate, dry and pulverize the washed silicon dioxide to obtain frict...

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Abstract

The invention belongs to the technical field of silicon dioxide, and particularly relates to a preparation method of low-specific-surface-area high-oil-absorption-value friction type silicon dioxide.The preparation method comprises the steps that S1, 8-12 m<3> of ethanol aqueous solution is injected and heated to 60-70 DEG C, and stirring starts; S2, water glass and sulfuric acid are added dropwise to carry out a parallel flow reaction, the pH value in the reaction process is controlled to be 6.0-6.8, meanwhile, absolute ethyl alcohol is added every 5-10 minutes in the reaction process to keep the volume ratio of ethyl alcohol to water in a reaction system to be 1:(3-7), after the water glass is dropwise added, dropwise addition of sulfuric acid is stopped, and stirring continues; S3, stirring and heating are stopped, aging is conducted for one hour, and pressure filtration, washing, drying and crushing are conducted on the on formed silicon dioxide to prepare silicon dioxide. The silicon dioxide has the advantages of a low in specific surface area, a high oil absorption value, a high water absorption amount, the friction property and the like; toothpaste has good friction and cleaning performance after the silicon dioxide is used, and meanwhile, the problem of expansion of the viscosity of the toothpaste is well solved.

Description

technical field [0001] The invention belongs to the technical field of silicon dioxide, and in particular relates to frictional silicon dioxide with a low specific surface area and high oil absorption value and a preparation method thereof. Background technique [0002] Abrasives account for a large proportion in the toothpaste formula. Abrasives can remove dirt on the surface of teeth. Good abrasives not only have the effect of cleaning teeth and removing plaque, but also cannot cause excessive wear and tear on teeth. Silica is a spherical porous structure without sharp edges and corners that will not wear teeth too much. It has stable physical and chemical properties, strong cleaning ability, good compatibility with toothpaste systems, and can be used for the preparation of transparent toothpaste. Has been widely used in the toothpaste industry. [0003] Silicon dioxide for toothpaste is divided into three series: friction type, comprehensive type and thickening type. Ac...

Claims

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Application Information

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IPC IPC(8): C01B33/193
CPCC01B33/193C01P2006/12C01P2006/19
Inventor 庹文喜胡荷燕林英光张梦梅候灿明
Owner GUANGZHOU FEIXUE MATERIAL TECH
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