Silica with low particle size and high dispersion and high transparency for toothpastes and preparation method thereof

A silicon dioxide, highly dispersed technology, applied in the direction of silicon dioxide, silicon oxide, cosmetic preparations, etc., can solve the problems of easy interaction, difficulty in obtaining transparent toothpaste, and large difference in light transmittance, so as to reduce production costs , good market prospects, and the effect of high dispersion characteristics

Inactive Publication Date: 2019-10-18
GUANGZHOU FEIXUE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The particle size of silica is too large, reaching 20-40 μm, and it needs to be crushed to a particle size of 8-15 μm to meet the good application in toothpaste. This will not only increase the production cost, but also easily destroy the particle itself. shape, reduce the original performance of the product, and cause product waste
[0005] 2. The surface activation energy of silica particles is high, and the particles are easy to interact with each other to form agglomerations, resulting in a decrease in dispersion performance
[0006] 3. The light transmittance o

Method used

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  • Silica with low particle size and high dispersion and high transparency for toothpastes and preparation method thereof
  • Silica with low particle size and high dispersion and high transparency for toothpastes and preparation method thereof
  • Silica with low particle size and high dispersion and high transparency for toothpastes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1. Silica for toothpaste with low particle size, high dispersion and high transparency of the present invention and its preparation method

[0034] S1. Add polyethylene glycol with a molecular weight of 4000 to the sodium silicate solution with a concentration of 2.0mol / L. The amount of polyethylene glycol added is 4wt% of the sodium silicate solution. Stir and disperse evenly to obtain a sodium silicate mixture. solution;

[0035] S2, add 10m of sodium sulfate solution that mass percent concentration is 4.0% in reaction tank 3 , set the mixer frequency to 25Hz, start stirring, and raise the temperature to 70°C;

[0036] S3, under stirring, dropwise add sodium silicate mixed solution 8m 3 Carry out co-current neutralization reaction with sulfuric acid solution whose concentration is 8mol / L, control the flow velocity of sodium silicate mixed solution to be 13m 3 / h, the flow rate of sulfuric acid solution is 2.5m 3 / h, the pH value of the reaction process is ...

Embodiment 2

[0038] Embodiment 2. Silica for toothpaste with low particle size, high dispersion and high transparency of the present invention and its preparation method

[0039] S1. Add polyethylene glycol with a molecular weight of 6000 to the sodium silicate solution with a concentration of 3.5mol / L. The amount of polyethylene glycol added is 8wt% of the sodium silicate solution. Stir and disperse evenly to obtain a sodium silicate mixture. solution;

[0040] S2, adding mass percent concentration to the reaction tank is 12m of sodium sulfate solution of 6.0%. 3, set the mixer frequency to 35Hz, start stirring, and raise the temperature to 70°C;

[0041] S3, while stirring, add sodium silicate mixed solution 10m 3 Perform co-current neutralization reaction with a sulfuric acid solution with a concentration of 10mol / L, and control the flow rate of the sodium silicate mixed solution to 13m 3 / h, the flow rate of sulfuric acid solution is 3.5m 3 / h, the pH value of the reaction process ...

Embodiment 3

[0043] Example 3. Silica for toothpaste with low particle size, high dispersion and high transparency of the present invention and its preparation method

[0044] S1. Add polyethylene glycol with a molecular weight of 6000 to the sodium silicate solution with a concentration of 2.2mol / L. The amount of polyethylene glycol added is 6wt% of the sodium silicate solution. Stir and disperse evenly to obtain a sodium silicate mixture. solution;

[0045] S2, adding mass percent concentration in the reaction tank is 10m of sodium sulfate solution of 4.5% 3 , set the frequency of the mixer to 30Hz, start stirring, and raise the temperature to 75°C;

[0046] S3, while stirring, add sodium silicate mixed solution 10m 3 Carry out co-current neutralization reaction with sulfuric acid solution whose concentration is 8mol / L, control the flow velocity of sodium silicate mixed solution to be 14m 3 / h, the flow rate of sulfuric acid solution is 3.5m 3 / h, the pH value of the reaction process...

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Abstract

The invention belongs to the technical field of silica for toothpastes, and particularly relates to silica with low particle size and high dispersion and high transparency for toothpastes and a preparation method thereof. The preparation method comprises the following steps: S1, adding polyethylene glycol to a sodium silicate solution, stirring and dispersing the solution uniformly to obtain a sodium silicate mixed solution; S2, adding a sodium sulfate solution into a reaction tank, starting stirring, and performing heating; S3 under stirring, simultaneously dropwise adding the sodium silicatemixed solution and a sulfuric acid solution, controlling a pH value to 8.5-9.5, controlling a temperature, continuously dropwise adding the sulfuric acid solution after addition of the sodium silicate mixed solution is completed, stopping addition of the sulfuric acid solution when pH is 4.0-5.0 to obtain silica; and S4, performing pressure filtration, washing and spray-drying to obtain silica for toothpastes. The method is simple in process, the prepared silica has small particle size, good dispersion and high light transmittance, and good application in toothpastes is satisfied.

Description

technical field [0001] The invention belongs to the technical field of silica preparation, and in particular relates to silica for toothpaste with low particle size, high dispersion and high transparency and a preparation method thereof. Background technique [0002] Silica is very stable due to its physical and chemical properties, acid and alkali resistance, high temperature resistance, no pollution to the environment, good cleaning performance, friction, and does not damage teeth, and has good compatibility with raw materials in toothpaste, and is compatible with fluorine High durability, so it replaces calcium carbonate and other raw materials as the abrasive and thickener of toothpaste. [0003] At present, the silica particles for toothpaste prepared by the precipitation method mainly have the following problems: [0004] 1. The particle size of silica is too large, reaching 20-40 μm, and it needs to be crushed to a particle size of 8-15 μm to meet the good applicatio...

Claims

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Application Information

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IPC IPC(8): C01B33/12A61K8/25A61Q11/00
CPCA61K8/25A61Q11/00C01B33/12C01P2004/61
Inventor 任振雪林超聪李丽峰林英光侯灿明
Owner GUANGZHOU FEIXUE MATERIAL TECH
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