Preparation method of precipitated silica thickening agent for toothpaste

A technology of silica and precipitation method, which is applied in the direction of silica, silica, cosmetic preparations, etc., can solve the problems of high energy consumption, high cost, unstable product index of silica thickener, etc., and achieve Reduced gel content, stable quality, and excellent thickening effect

Active Publication Date: 2016-12-07
通化双龙化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the product index of the silica thickener prepared by the above method is unstable, the process needs to be precisely controlled, the energy consumption of the product is large, and the cost is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Use a 5000L agitated reactor with a density of 1.084g / cm 3 (20°C) 2250L of sodium silicate aqueous solution, add 300L of tap water, directly raise the temperature to 87°C with 0.85Mpa saturated steam, then add 15% dilute sulfuric acid in 38 minutes, at this time the pH value of the suspension is 10.3, and then 750L of density 1.084g / cm 3 (20°C). The sodium silicate aqueous solution is added to the reaction kettle in 50 minutes, and 15% dilute sulfuric acid is added at the same time. During this reaction process, the pH value remains unchanged at 10.4, and the temperature remains unchanged at 87%. Then, 15% dilute sulfuric acid is added to the reaction kettle in 27 minutes. When the pH value of the suspension is 4.5, then heat preservation and aging for 30 minutes, the synthesis reaction is over, after aging, the suspension is filtered, washed, pulped, dried, crushed and classified to obtain the finished silica, and the pH of the silica is detected The value is 6.51, t...

Embodiment 2

[0028] The difference from Example 1 is that 450L of water is added to the bottom liquid, and the pH value of the silicon dioxide is 6.42, the DBP oil absorption value is 278ml / 100g, the water absorption is 57.3ml / 20g, and the BET specific surface area is 265m 2 / g, with an average particle size of 12.35µm.

Embodiment 3

[0030] Different from Example 1, the bottom liquid density is 1.084g / cm 3 Add 2400L of sodium silicate aqueous solution, and add 600L in the second stage. The pH value of this silica is detected to be 6.31, the DBP oil absorption value is 282ml / 100g, the water absorption is 57.9ml / 20g, and the BET specific surface area is 272m 2 / g, with an average particle size of 12.38µm.

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Abstract

The invention relates to a preparation method of a precipitated silica thickening agent for toothpaste. The raw materials include sodium silicate, dilute sulfuric acid and tap water, the synthesis process has no need of adding any structural control agent and electrolyte, and employs saturated steam for direct heating to lower the production cost. The synthesis process adopts three-section dilute sulfuric acid adding reaction, and ensures the particle uniformity and dispersion. The method is simple and easy to operate, and can guarantee the stability of product quality. The precipitated silica obtained by the method has the characteristics of large specific surface area and excellent thickening effect, and is suitable for use as a toothpaste thickening agent. The precipitated silica thickening agent for toothpaste provided by the invention has the characteristics of: a pH value of 5.5-7.5, a DBP oil absorption value of 250-300ml / 100g, a water absorption amount of 56-60ml / 20g, a BET specific surface area of 240-280m<2> / g, and an average particle size of 10-13 micrometers.

Description

technical field [0001] The invention belongs to a preparation method of a chemical product, in particular to a preparation method of a precipitated silicon dioxide thickener for toothpaste. Background technique [0002] In the prior art, silica is used as a toothpaste thickener to thicken and stabilize the paste, mainly to provide good pseudoplasticity and thixotropy for the paste, and the silica thickener can make the paste The apparent viscosity of the body increases, which can suspend the effective friction agent and polishing particles, and prevent the separation of the solid and liquid components in the toothpaste. The performance of the silica thickener will directly affect the stability of the toothpaste. [0003] At present, the method of using silicon dioxide thickener for toothpaste is to add alkali metal salt and acidulant concurrently into preheated water, the preferred sodium silicate of alkali metal salt, the preferred sulfuric acid acidulant, maintain reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12A61K8/25A61Q11/00
CPCA61K8/25A61K2800/412A61Q11/00C01B33/12C01P2004/61C01P2006/12
Inventor 白英杰
Owner 通化双龙化工股份有限公司
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