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A kind of preparation method of low defoaming silicon dioxide

A silicon dioxide and defoaming technology, applied in chemical instruments and methods, cosmetic preparations, medical preparations containing active ingredients, etc., to achieve the effects of reduced adsorption, controllable conditions, and low production costs

Active Publication Date: 2017-12-19
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 defoaming problem existing in the existing silicon dioxide for toothpaste, the present invention provides a preparation method of low defoaming silicon dioxide, which is carried out by adding a suitable surfactant to the silicon dioxide during the reaction process. Surface modification, while controlling the temperature, pH value, and concentration during the reaction process, to reduce the defoaming properties of silicon dioxide on toothpaste foaming agents, and reduce the defoaming properties to less than 10%

Method used

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  • A kind of preparation method of low defoaming silicon dioxide
  • A kind of preparation method of low defoaming silicon dioxide

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Embodiment 1

[0026] Embodiment 1, the preparation method of low defoaming silica of the present invention

[0027] S1, add 5m into the reactor 3 Sodium sulfate solution, start stirring, then add 1.0kg composite surfactant, stir evenly and heat to 60°C;

[0028] S2, at 10m 3 Add 6m into the reactor at a flow rate of / h 3 Sodium silicate solution, add sulfuric acid solution to the reaction kettle after adding sodium silicate solution for half a minute, adjust the adding speed of sulfuric acid solution to control the pH value of the reaction process to 9.0, continue to add sulfuric acid solution after adding sodium silicate solution, until The pH value at the end of the reaction is 4.0, and the addition of sulfuric acid solution is stopped;

[0029] S3. Maintain 60° C., continue to stir for 10 minutes, press filter and wash the formed silica precipitate, dry and pulverize the washed silica to obtain low defoaming silica.

[0030] The composite surfactant is a composition of sodium dodecyl...

Embodiment 2

[0034] Embodiment 2, the preparation method of low defoaming silica of the present invention

[0035] S1, add 10m 3 Sodium sulfate solution, start stirring, then add 3.0kg composite surfactant, stir evenly and heat to 70°C;

[0036] S2, at 15m 3 Add 11m to the reactor at a flow rate of / h 3 Sodium silicate solution, add sulfuric acid solution to the reaction kettle after adding sodium silicate solution for half a minute, adjust the adding speed of sulfuric acid solution to control the pH value of the reaction process to 9.5, continue to add sulfuric acid solution after adding sodium silicate solution, until The pH value at the end of the reaction is 5.0, and the addition of sulfuric acid solution is stopped;

[0037] S3. Keep at 70° C., continue to stir for 15 minutes, press filter and wash the formed silica precipitate, dry and pulverize the washed silica to obtain low defoaming silica.

[0038] Described composite surfactant is the composition of fatty alcohol polyoxyeth...

Embodiment 3

[0042] Embodiment 3, the preparation method of low defoaming silica of the present invention

[0043] S1, add 8m into the reactor 3 Sodium sulfate solution, start stirring, then add 2.0kg composite surfactant, stir evenly and heat to 65°C;

[0044] S2, with 12m 3 Add 9m into the reactor at a flow rate of / h 3 Sodium silicate solution, add sulfuric acid solution to the reaction kettle after adding sodium silicate solution for half a minute, adjust the adding speed of sulfuric acid solution to control the pH value of the reaction process to 9.0, continue to add sulfuric acid solution after adding sodium silicate solution, until The pH value at the end of the reaction is 4.5, stop adding sulfuric acid solution;

[0045] S3. Maintain 65° C., continue to stir for 10 minutes, press filter and wash the formed silica precipitate, dry and pulverize the washed silica to obtain low defoaming silica.

[0046] Described composite surfactant is the composition of fatty alcohol polyoxyet...

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Abstract

The invention belongs to the technical field of silica and relates to a preparation method of low defoaming silica. The preparation method comprises S1, adding a sodium sulfate solution into a reactor, stirring the solution, adding a complex surfactant into the solution, and uniformly stirring and heating the solution, S2, adding a sodium silicate solution into the solution, after 0.5min, adding a sulfuric acid solution into the mixed solution, adjusting a sulfuric acid addition rate to control pH to 9.0-9.5 in the reaction process, and then adding a sulfuric acid solution into the mixed solution until terminal pH of 4.0-5.0, S3, continuously stirring the solution at the temperature, carrying out filter pressing on the formed silica, and carrying out washing, drying and crushing to obtain the low defoaming silica. The preparation method has the advantages of simple process, stable process, low production cost and less pollution. The low defoaming silica has low defoaming ability, has good compatibility with a toothpaste foaming agent and effectively enhances washing foam feeling of the toothpaste.

Description

technical field [0001] The invention belongs to the technical field of silicon dioxide, and in particular relates to a preparation method of low-defoaming silicon dioxide. Background technique [0002] Abrasives and foaming agents are both important components of toothpaste formulations. Silica is widely used in toothpaste formulations due to its unique molecular structure, stable physical and chemical properties, and good abrasive cleaning ability. [0003] However, ordinary silica for toothpaste has a small particle size, large specific surface area, high surface energy, and a three-dimensional network structure, so it has a strong adsorption performance and will have a strong adsorption effect on air bubbles, thereby affecting toothpaste foaming agents. The generated foam has a certain defoaming effect, which reduces the richness of the foam when brushing teeth and affects the mouthfeel of toothpaste. [0004] However, at present, after searching, there are few studies o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/193A61K8/25A61Q11/00
CPCA61K8/25A61K2800/28A61Q11/00C01B33/193C01P2006/11C01P2006/19
Inventor 林英光孙东方胡荷燕李丽峰庹文喜
Owner GUANGZHOU FEIXUE MATERIAL TECH
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