Precipitated silica for low-viscosity toothpaste and preparation method of precipitated silica

Abstract

The invention belongs to the technical field of silica preparation, and particularly relates to precipitated silica for low-viscosity toothpaste and a preparation method of the precipitated silica. The preparation method comprises the following steps: S1, adding a sodium sulfate solution to a reaction kettle, conducting stirring and heating, and then adding a sodium silicate solution to adjust thepH value; S2, simultaneously adding a sodium silicate solution and a sulfuric acid solution for reaction, and controlling the pH value of the reaction process to be 9-10, and after the sodium silicate solution is completely added, continuing adding the sulfuric acid solution until an end point pH value, and conducting stirring to obtain a preliminary product of silica; and S3, subjecting the preliminary product of silica to pressure filtration and washing by dilute sulfuric acid, and then conducting drying, and finally conducting crushing, so as to prepare the silica. The silica of the present invention can reduce the initial viscosity of the toothpaste and inhibit the viscosity of the toothpaste from growing, enables the toothpaste to maintain a proper viscosity, a good pseudoplasticityand thixotropy, and has a good application effect.

Description

technical field [0001] The invention belongs to the technical field of silica preparation, and in particular relates to precipitated silica for low-viscosity toothpaste and a preparation method thereof. Background technique [0002] Silica has been used in toothpaste for more than 20 years. At present, most of the industrially produced silica is silicic acid produced by the reaction of sodium silicate and acid, and the silicic acid is hydrolyzed into hydrated silica and water under certain conditions. Silica is chemically inert, has good compatibility with fluoride and other raw materials in toothpaste, and has good compatibility, and the quality of the paste is stable. According to different needs, different production processes can be used to obtain silica with corresponding specifications, such as friction type, thickening type, and mixed type. [0003] Thickening silica can provide a certain consistency and good thixotropy to the aqueous dispersion of silica, and impro...

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art (such as traditional silicon dioxide is easy to cause excessive viscosity of toothpaste, complex silicon dioxide modification process, serious increase in toothpaste viscosity, etc.), the present invention makes silicon dioxide in the toothpaste through process improvement. While maintaining good abrasive cleaning performance, it has the properties of making the toothpaste have low initial viscosity and low post-growth viscosity, so that the toothpaste maintains good pseudoplasticity and thixotropy

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